CN208024339U

CN208024339U - Oil well determination of distance device

Info

Publication number: CN208024339U
Application number: CN201820434991.8U
Authority: CN
Inventors: 梁华庆; 张睿; 范家怿; 颜肖平; 窦新宇; 高德利
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2018-10-30
Anticipated expiration: 2028-03-29

Abstract

The utility model provides a kind of oil well determination of distance device, which includes：Ground instrument, Magnetic Sensor, current source；One end of current source is electrically connected with the top of the casing of the first oil well；Magnetic Sensor is fixed in the second oil well；The other end of current source is electrically connected with the earth or the other end of current source is electrically connected with the top of the casing of third oil well, and third oil well is the oil well that another has completed drilling well process；The other end of current source and the distance between the tie point of the earth and current source are more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and third oil well；Current source is powered to the casing of the first oil well, so that the sleeve of the first oil well is at alternating magnetic field；Ground instrument obtains the amplitude for the alternating magnetic field that Magnetic Sensor detects, and according to amplitude, determines the distance between the second oil well and the first oil well；Effective detection range is longer, without any tool of tripping in drilling well, to not influence the normal production of drilling well.

Description

Oil well determination of distance device

Technical field

The utility model is related to oil development drilling technology field more particularly to a kind of oil well determination of distance devices.

Background technology

For oil development drilling well, especially for the drilling well of cluster well and Encryption Well, need to carry out drilling well process, in turn Obtain oil well.In drilling process, currently carrying out the oil well of drilling well process, it is most likely that be with other oil wells in position It is adjacent.Due to casing programme complexity, the accident that the wellbore of adjacent oil well is mutually collided easily occurs in drilling process；In turn The normal productive process for influencing whether oil well causes huge economic loss.In order to prevent in drilling process adjacent oil well well The accident that eye mutually collides, can be in real time to carrying out the oil well of drilling well process, completing drilling process with other The distance between oil well is detected.

In the prior art, a kind of active magnetic detection method may be used to go to detect the distance between adjacent oil well, It carries out that two electromagnet that magnetic moment is equal in magnitude, direction is opposite are arranged in the oil well of drilling well process, the two electromagnet can be with magnetic Change the casing of adjacent oil well；And a magnetic field sensor is installed at the center of two electromagnet, which can be with The casing for detecting adjacent oil well magnetizes the magnetic field intensity information in the magnetic field generated later, and then is determined according to magnetic field intensity information The distance between adjacent oil well.But the length of the detection instrument in the technology is longer, needs to reach 1.2 meters or more, can be to just The guide function of drilling well has an adverse effect；Moreover, because being limited by underground power supply used and space, the magnetic that two electromagnet generate Magnetizing field is weaker, therefore effective detection range is short, can only achieve several meters.

Utility model content

The utility model provides a kind of oil well determination of distance device, to solve the problems, such as that effective detection range is shorter.

On the one hand, the utility model provides a kind of oil well determination of distance method, including：

Current source to the casing of the first oil well power so that first oil well sleeve at alternating magnetic field after, obtain Take the amplitude for the alternating magnetic field that Magnetic Sensor detects, wherein first oil well is one and has completed drilling well process Oil well, the Magnetic Sensor is fixed in the second oil well, and second oil well is one and is carrying out drilling well process Oil well, one end of the current source are electrically connected with the top of the casing of first oil well；The other end of the current source with it is big Ground is electrically connected or the other end of the current source is electrically connected with the top of the casing of third oil well, and the third oil well is another One oil well for having completed drilling well process；Wherein, tie point and the electricity of the other end of the current source with the earth The distance between stream source is more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；

According to the amplitude, the distance between second oil well and first oil well are determined.

Further, the distance between second oil well and first oil well are Wherein, H is the amplitude of the alternating magnetic field, and π is pi, μ₀For space permeability, μ is the week of the casing of first oil well The magnetic conductivity of exclosure layer, α are between the central axis of second oil well and the central axis of the casing of first oil well Angle, angles of the θ between first straight line and second straight line, the first straight line are micro- circle on the casing of first oil well Connection straight line between ring and the location point of the Magnetic Sensor, the second straight line are on the casing by first oil well Micro- annulus and be parallel to second oil well central axis straight line, I_lFor first oil well casing at depth l Current strength, and I_l=I₀e^-l/k, k is predetermined coefficient, I₀It is inputted into the casing of first oil well for the current source Current strength, depth l be first oil well casing on micro- annulus and first oil well casing top between Distance.

Further, described to be powered to the casing of the first oil well in current source so that the sleeve of first oil well strikes a bargain After varying magnetic field, the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained, including：

When the current source is not powered to the casing of first oil well, obtain the Magnetic Sensor detect it is quiet The first magnetic field intensity information in magnetic field, and Fourier transformation is carried out to the first magnetic field intensity information, obtain the of magnetostatic field One amplitude；

When the current source is powered to the casing of first oil well, the second magnetic that the Magnetic Sensor detects is obtained Field intensity information, and Fourier transformation is carried out to the second magnetic field intensity information, obtain the second amplitude；

Second amplitude is subtracted into the first amplitude, obtains the amplitude of the alternating magnetic field.

Further, when the current source is not powered to the casing of first oil well, the Magnetic Sensor is obtained The the first magnetic field intensity information detected, including：

First control signal is sent to the current source, current source is not to institute described in the first control signal characterization control The casing power supply of the first oil well is stated, and obtains the first magnetic field intensity information；

When the current source is powered to the casing of first oil well, the second magnetic that the Magnetic Sensor detects is obtained Field intensity information, including：

Second control signal is sent to the current source, current source described in the second control signal characterization control is to described The casing of first oil well is powered, and obtains second amplitude.

Further, when the number of the first oil well is N number of, the number of the current source is N number of, and N is more than or equal to 2 Positive integer, the first oil well are connect correspondingly with current source, correspondingly, it is described in current source to the casing of the first oil well Power so that first oil well sleeve at alternating magnetic field after, obtain the alternating magnetic field that detects of Magnetic Sensor Amplitude, including：

Each current source in N number of current source input current into the casing of the first oil well corresponding with the current source So that after the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained, In, the frequency for the electric current that different current sources is inputted into the casing of the first different oil wells is different；

Fourier transformation is carried out to the alternating magnetic field signal, obtains the corresponding amplitude of each described first oil well；

Correspondingly, according to the amplitude, the distance between second oil well and first oil well are determined, including：

According to the corresponding amplitude of the first oil well described in each, determine second oil well respectively with described in each first The distance between oil well.

On the other hand, the utility model provides a kind of oil well determination of distance device, including：

Ground instrument, Magnetic Sensor and current source；

One end of the current source is electrically connected with the top of the casing of the first oil well, and first oil well is one complete At the oil well of drilling well process；The ground instrument is electrically connected with the Magnetic Sensor, and the Magnetic Sensor is fixed at the second oil In well, second oil well is an oil well for carrying out drilling well process；The other end of the current source is electrically connected with the earth, Or the other end of the current source is electrically connected with the top of the casing of third oil well, the third oil well is that another is complete At the oil well of drilling well process；Wherein, between the other end of the current source and the tie point and the current source of the earth Distance is more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；

The current source, for powering to the casing of first oil well, so that the sleeve of first oil well strikes a bargain Varying magnetic field；

The ground instrument, the amplitude for obtaining the alternating magnetic field that the Magnetic Sensor detects, and according to described Amplitude determines the distance between second oil well and first oil well.

Further, the distance between second oil well and first oil well are Wherein, H is the amplitude of the alternating magnetic field, and π is pi, μ₀For space permeability, μ is the week of the casing of first oil well The magnetic conductivity of exclosure layer, α are between the central axis of second oil well and the central axis of the casing of first oil well Angle, angles of the θ between first straight line and second straight line, the first straight line are micro- circle on the casing of first oil well Connection straight line between ring and the location point of the Magnetic Sensor, the second straight line are on the casing by first oil well Micro- annulus and be parallel to second oil well central axis straight line, I_lFor first oil well casing at depth l Current strength, and I_l=I₀e^-l/k, k is predetermined coefficient, I₀It is inputted into the casing of first oil well for the current source Current strength, depth l be first oil well casing on micro- annulus and first oil well casing top between Distance；

The ground instrument, is specifically used for：

Further, the ground instrument, is additionally operable to：

Each current source in N number of current source input current into the casing of the first oil well corresponding with the current source So that after the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained, In, the frequency for the electric current that different current sources is inputted into the casing of the first different oil wells is different, and the number of the first oil well is N A, N is the positive integer more than or equal to 2, and the first oil well is connect correspondingly with current source；

According to the amplitude of the corresponding alternating magnetic field of the first oil well described in each, determine second oil well respectively with it is each The distance between a described first oil well.

Further, the Magnetic Sensor is located in inserting tube, wherein the inserting tube be located at the drill bit of second oil well with Between non magnetic drill collar.

Further, the ground instrument is electrically connected with the current source；

The ground instrument is additionally operable to send first control signal to the current source, to control the current source not to institute The casing power supply for stating the first oil well, is additionally operable to send second control signal to the current source, to control the current source to institute State the casing power supply of the first oil well.

Further, the Magnetic Sensor is spirally connected with the inserting tube；Alternatively, being fixedly connected on the inserting tube, there are one closings Box, the Magnetic Sensor are fixed in the closing box.

Further, it is provided with sealing ring on the edge of the closing box,

Further, the closing box is square or cuboid or cylinder.

Further, it is provided with drilling equipment in second oil well.

Further, one end of the current source is electrically connected by the first conducting wire with the top of the casing of the first oil well；Institute The other end for stating current source is electrically connected with the earth by the second conducting wire or the other end of the current source is led by described second Line is electrically connected with the top of the casing of the third oil well.

Oil well determination of distance device provided by the utility model, by providing by ground instrument, Magnetic Sensor and electric current The oil well determination of distance device that source is constituted, inputs alternating current in the casing into drilling well, and then by the casing of drilling well Magnetized, then the Magnetic Sensor in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing of drilling well, ground For face instrument so as to calculate positive drilling well and the distance between drilling well according to the amplitude information, which can be preferable The distance between symbolize the information of drilling well, and then two adjacent oil wells can be accurately determined out, measurement accuracy is higher；Its In, the other end of current source and the distance between the tie point of the earth and current source are more than or equal to 50 meters, alternatively, the first oil well Distance is more than or equal to 50 meters between third oil well, and then avoids the formation of short distance circuit and cause electric current can not be along drilling well Casing flow downward；Scheme provided in this embodiment, can be in the drilling process of positive drilling well, detection in real time and adjacent oil The distance between well provides an offset well apart from measurement while drilling device and scheme.In the present embodiment, it is only necessary to by current source One end connect with the top of the casing of drilling well, without any tool of tripping in drilling well, to not influencing drilling well Normal production, and it is provided in this embodiment apart from detection scheme safe operation, conveniently；And use powerful electric current degaussing Change casing, can effectively enhance magnetizing field strength, improve ranging distance and precision, is offset well distance measurement and cluster well anti-collision It hits and provides an effective technological means.

Description of the drawings

The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure Example, and together with specification for explaining the principles of this disclosure.

Fig. 1 is a kind of flow diagram for oil well determination of distance method that the utility model embodiment provides；

Fig. 2 is the flow diagram for another oil well determination of distance method that the utility model embodiment provides；

Fig. 3 is the casing of the first oil well in another oil well determination of distance method that the utility model embodiment provides On alternating magnetic field schematic diagram；

Fig. 4 is the casing of the first oil well in another oil well determination of distance method that the utility model embodiment provides Alternating magnetic field derivation model schematic；

Fig. 5 is the flow diagram for another oil well determination of distance method that the utility model embodiment provides；

Fig. 6 is a kind of structural schematic diagram for oil well determination of distance device that the utility model embodiment provides；

Fig. 7 is a kind of measuring principle schematic diagram for oil well determination of distance device that the utility model embodiment provides；

Fig. 8 is the structural schematic diagram for another oil well determination of distance device that the utility model embodiment provides；

Fig. 9 is the measuring principle schematic diagram for another oil well determination of distance device that the utility model embodiment provides.

Reference numeral：

61：Ground instrument； 62：Magnetic Sensor； 63：Current source；

64：First oil well； 65：Casing； 66：Second oil well；

71：Inserting tube； 72：Drilling rod； 73：Drill collar

74：Measurement-while-drilling system； 75：Power drilling tool； 76：Drill bit.

Specific implementation mode

Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.

The noun involved by the utility model is explained first：

Positive drilling well：Carrying out the oil well of drilling well process.Drilling well：The oil well of drilling well process is completed.

The specific application scenarios of the utility model are as follows.This kind of oil well of cluster well, with its economical and efficient, facilitate management etc. it is all More advantages and by ocean, land oil field institute it is widely used.With the exploitation of large oilfield, the directed-drilling technique of cluster well obtains Significant progress and raising, but between oil well well spacing it is smaller and smaller, in addition the casing programme of oil well is complicated, to The accident that the wellbore of adjacent oil well is mutually collided easily occurs in drilling process.Wellbore collision accident can bring serious consequence, Casing deformation that is light then causing drilling well, casing that is heavy then drilling drilling well, and then the normal production of oil well is influenced, it causes huge Economic loss.Therefore, the wellbore collision problem for solving cluster well, to ensureing that it is extremely heavy that the drillng operation of cluster well has safely The meaning wanted.So as to carry out the measurement of the distance between adjacent oil well, i.e., to positive drilling well and the distance between drilling well into Row measures.

Now, the Scientific Drilling International companies in the U.S. use a kind of passive magnetic detection Method, principle are that magnetic field sensor is arranged in positive drilling well, using the magnetic field sensor detection by earth's magnetic field it is magnetized it is adjacent Magnetic anomaly field information caused by the casing of drilling well, and then positive drilling well determined according to the magnetic anomaly field information and between drilling well Distance.But since the magnetic field intensity in earth's magnetic field is relatively weak, the casing for magnetizing drilling well by earth's magnetic field is generated later Magnetic anomaly field intensity is also weaker, detects faint magnetic field signal to need high-precision Magnetic Sensor, is surveyed to increase The cost of amount；Also, generated magnetic anomaly field intensity is weaker after being also due to the casing of earth's magnetic field magnetization drilling well, to This method can only the closer oil well of detection range, and detection accuracy is relatively low.

In addition, the Wu Zhiyong et al. of China University Of Petroleum Beijing proposes another active magnetic detection method, this method is just Magnetize the casing of adjacent oil well using two electromagnet that magnetic moment is equal in magnitude, direction is opposite in drilling well, and in two electricity Magnetic blow out centre installs a magnetic field sensor, and the detection magnetized magnetic field intensity information of casing, Jin Ergen are removed using the Magnetic Sensor Distance between two oil wells is determined according to the magnetic field intensity information.But in this method, the detection instrument that is detected Length is longer, needs to reach 1.2 meters or more, and then can have an adverse effect to the guide function of positive drilling well.Moreover, because by well The limitation of lower power supply and space, the magnetizing field that two electromagnet generate is weaker, therefore effective detection range can only achieve several meters.

It is used at present to meet that accuracy is high, ranging is remote, easy to operate simultaneously with boring distance measuring method to sum up Deng requirement.In addition, when the periphery of positive drilling well is there are when more mouthfuls of drilling wells, current can not determine positive brill with brill distance measuring method Well respectively with more mouthfuls of drilling wells the distance between.Oil well determination of distance method and apparatus provided by the utility model, it is intended to Solve the technical problem as above of the prior art.

Below with specific embodiment to the technical solution of the utility model and the technical solution of the utility model how Above-mentioned technical problem is solved to be described in detail.These specific embodiments can be combined with each other below, for identical or phase As concept or process may repeat no more in certain embodiments.Below in conjunction with attached drawing, to the embodiments of the present invention It is described.

Fig. 1 is a kind of flow diagram for oil well determination of distance method that the utility model embodiment provides.Such as Fig. 1 institutes Show, this method includes：

Step 101, current source to the casing of the first oil well power so that the first oil well sleeve at alternating magnetic field it Afterwards, the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained, wherein the first oil well is the oil for having completed drilling well process Well, Magnetic Sensor are fixed in the second oil well, and the second oil well is an oil well for carrying out drilling well process, current source One end is electrically connected with the top of the casing of the first oil well；The other end of current source with the earth be electrically connected or current source it is another End is electrically connected with the top of the casing of third oil well, and third oil well is the oil well that another has completed drilling well process；Wherein, electric The other end in stream source and the distance between the tie point of the earth and current source are more than or equal to 50 meters；First oil well and third oil well Between distance be more than or equal to 50 meters.

In the present embodiment, specifically, the executive agent of the present embodiment can be ground instrument or other devices or set It is standby.The present embodiment is introduced by ground instrument of executive agent.

First oil well is an oil well for having completed drilling well process, and the second oil well is one and is carrying out drilling well process Oil well.During carrying out drilling well to the second oil well, need to measure the distance between the first oil well and the second oil well in real time, It is mutually collided to avoid wellbore.

First, a Magnetic Sensor is fixed in the second oil well, Magnetic Sensor and ground instrument is electrically connected. A powerful current source is provided, one end of current source and the top of the casing of the first oil well are electrically connected.And The other end of current source and the earth are electrically connected, wherein the other end of current source and the tie point of the earth and current source it Between distance need be more than or equal to 50 meters；Alternatively, the top of the other end of current source and the casing of a third oil well is carried out Electrical connection, wherein third oil well is the oil well that another has completed drilling well process, is needed between the first oil well and third oil well Distance is more than or equal to 50 meters.Also, the powerful current source setting is on the ground.

Specifically, the first oil well is a drilling well, and the second oil well is a positive drilling well；Near drilling well site A powerful current source is placed on ground, which is connected on drilling well-head casing；The current source it is another One end be connected to another drilling well or the current source except 50 meters the other end be connected to except 50 meters with greatly connect Touch good copper electrode on, and then avoid the formation of short distance circuit and cause electric current can not along drilling well casing to flow down It is dynamic.Wherein, above-mentioned copper electrode is the tie point of the other end and the earth of current source.

Then, alternating current is injected into the first oil well using powerful current source, which is low frequency, big work( The frequency of the electric current of rate, the alternating current is generally less than 30 hertz (Hz), and alternating current size is I₀, so as to oily by first The casing of well is magnetized, and the casing of the first oil well forms an alternating magnetic field.

Due to being provided with a Magnetic Sensor in the second oil well, Magnetic Sensor is electrically connected with ground instrument.To magnetic The casing that sensor can receive the first oil well is formed by the magnetic field intensity information of alternating magnetic field, which is The amplitude of alternating magnetic field, in turn, ground instrument can get the amplitude of the alternating magnetic field detected by Magnetic Sensor.

Step 102, according to amplitude, determine the distance between the second oil well and the first oil well.

In the present embodiment, specifically, ground instrument is according to the amplitude of the alternating magnetic field got, according to carrying in the prior art The oil well distance calculating method of confession, can calculate the distance between the second oil well and the first oil well, which is a vector Distance.

The present embodiment magnetizes by input current in the casing into drilling well, and then by the casing of drilling well, so The Magnetic Sensor in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing of drilling well afterwards, ground instrument so as to Positive drilling well and the distance between drilling well are calculated according to the amplitude information, which can preferably symbolize drilling well Information, and then the distance between two adjacent oil wells can be accurately determined out, measurement accuracy is higher；Wherein, current source The distance between tie point and current source of the other end and the earth are more than or equal to 50 meters, alternatively, the first oil well and third oil well it Between distance be more than or equal to 50 meters, and then avoid the formation of short distance circuit and cause electric current can not along drilling well casing to flow down It is dynamic；Scheme provided in this embodiment, can in the drilling process of positive drilling well, in real time detection adjacent oil well between away from From providing an offset well apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by the one of current source End is connect with the top of the casing of drilling well, without any tool of tripping in drilling well, to not influence the normal of drilling well Production, and it is provided in this embodiment apart from detection scheme safe operation, conveniently；And use powerful electric current demagnetization set Pipe can effectively enhance magnetizing field strength, improve ranging distance and precision, carried with cluster well anticollision for offset well distance measurement An effective technological means is supplied.

Fig. 2 is the flow diagram for another oil well determination of distance method that the utility model embodiment provides.Such as Fig. 2 Shown, this method includes：

Step 201, when current source is not powered to the casing of the first oil well, obtain the magnetostatic field that detects of Magnetic Sensor The first magnetic field intensity information, and to the first magnetic field intensity information carry out Fourier transformation, obtain the first amplitude of magnetostatic field.

In optionally a kind of embodiment, step 201 specifically includes：To current source send first control signal, first It controls characterization control current source not power to the casing of the first oil well, and obtains the first magnetic field intensity information, and to first Magnetic field intensity information carries out Fourier transformation, obtains the first amplitude of magnetostatic field.

Wherein, the first oil well is an oil well for having completed drilling well process, and Magnetic Sensor is fixed at the second oil well In, the second oil well is an oil well for carrying out drilling well process, the top electricity of one end of current source and the casing of the first oil well Connection；The other end of current source is electrically connected with the earth or the other end of current source and the top of the casing of third oil well are electrically connected It connects, third oil well is the oil well that another has completed drilling well process.

First, a Magnetic Sensor is fixed in the second oil well, Magnetic Sensor and ground instrument is electrically connected； Specifically, an inserting tube is set between the drill bit and non magnetic drill collar of the second oil well, Magnetic Sensor is arranged in inserting tube, magnetic Sensor is used to receive the Magnetic Field generated after casing magnetization；Also, the circuit in inserting tube can be by collected magnetic field number According to being uploaded to ground instrument by measurement-while-drilling system (Measurement While Drilling, abbreviation MWD).Provide one A powerful current source, one end of current source and the top of the casing of the first oil well are electrically connected；And by current source The other end be electrically connected with the earth, or the top of the other end of current source and the casing of a third oil well carried out electric Connection, wherein third oil well is the oil well that another has completed drilling well process.Also, the powerful current source setting exists On ground.Current source is electrically connected with ground instrument.

Then, ground instrument to current source send first control signal, the first control signal characterization control current source not to The casing of first oil well is powered, at this point, current source is not powered into the casing of the first oil well, i.e., current source is not to the first oil Input AC electric current in the casing of well；To at this point, not by injection alternating current in the casing of the first oil well, the first oil well Casing is not magnetized；At this point, the Magnetic Sensor in the second oil well receive be the earth magnetostatic field the first magnetic field intensity Information；Then ground instrument gets the first magnetic field intensity information, and instrument pair the first magnetic field intensity information in ground carries out Fourier transformation, It can obtain the amplitude H of magnetostatic field., the amplitude H of the magnetostatic field of the earth.For first amplitude.Wherein, the first oil well be one Drilling well, the second oil well are a positive drilling wells.Also, when drilling well at a distance from positive drilling well farther out when, such as distance is more than It when 20 meters, is not enough to be received by Magnetic Sensor since the magnetic field that is magnetized is too small, to which ground instrument can only calculate the earth The amplitude H of magnetostatic field.

Step 202, when current source is powered to the casing of the first oil well, it is strong to obtain the second magnetic field for detecting of Magnetic Sensor Information is spent, and Fourier transformation is carried out to the second magnetic field intensity information, obtains the second amplitude.

In optionally a kind of embodiment, step 202 specifically includes：To current source send second control signal, second It controls characterization and controls current source to the power supply of the casing of the first oil well, and obtain the second magnetic field intensity information, and to the second magnetic Field intensity information carries out Fourier transformation, obtains the second amplitude.

In the present embodiment, specifically, ground instrument sends second control signal to current source, second control signal characterizes It controls current source to power to the casing of the first oil well, at this point, current source is powered into the casing of the first oil well, i.e. current source is to the Input AC electric current in the casing of one oil well；To at this point, by injection alternating current in the casing of the first oil well, the first oil well Casing is magnetized；At this point, what the Magnetic Sensor in the second oil well received is the second magnetic field intensity information；Ground instrument obtains second Magnetic field intensity information, then the second magnetic field intensity of ground instrument pair information progress Fourier transformation, obtains a second amplitude H ', this When, the second amplitude H ' is the amplitude H of the magnetostatic field of the earth.In addition the amplitude H of alternating magnetic field.

Second amplitude is subtracted first amplitude by step 203, obtains the amplitude of alternating magnetic field.

In the present embodiment, specifically, the second amplitude is subtracted first amplitude by ground instrument, the amplitude H of alternating magnetic field is obtained.

Step 204, according to amplitude, determine that the distance between the second oil well and the first oil well are Wherein, H is the amplitude of alternating magnetic field, and π is pi, μ₀For space permeability, μ is the surrounding formation of the casing of the first oil well Magnetic conductivity, α are the angle between the central axis of the second oil well and the central axis of the casing of the first oil well, and θ is first straight line Angle between second straight line, first straight line is for micro- annulus on the casing of the first oil well and between the location point of Magnetic Sensor Connection straight line, second straight line is by micro- annulus on the casing of the first oil well and to be parallel to the central axis of the second oil well Straight line, I_lFor current strength of the casing at depth l of the first oil well, and I_l=I₀e^-l/k, k is predetermined coefficient, I₀For electric current The current strength that source is inputted into the casing of the first oil well, depth l are micro- annulus and the first oil on the casing of the first oil well The distance between top of casing of well.

In the present embodiment, specifically, Fig. 3 is another oil well determination of distance side that the utility model embodiment provides The schematic diagram of alternating magnetic field on the casing of the first oil well in method, as shown in figure 3, being carried to the casing of the first oil well in current source After alternating current, during electric current flows downward along the casing of the first oil well, can constantly have and flow into surrounding formation Leak electric current I_d, i.e. electric current can be lost in, but since the casing of the first oil well is ferromagnetic material, the resistivity of casing is minimum, set 6~7 orders of magnitude of the resistivity of pipe and the resisitivity on stratum, therefore, leak electric current I_dIt is very small.

In figure 3, since the length of casing is far longer than the diameter and thickness of casing, so as to the casing etc. after being powered Effect is an electromotion straight wire, and casing can be resolved into several micro- annulus dl '.The casing of first oil well is connect with current source Point be decanting point, the current strength of the electric current that current source input to the casing of the first oil well is I₀, it is assumed that the first oil well Some micro- annulus P on casing is depth l at a distance from decanting point, then the electric current I at P_lExponential law is carried out as follows Decaying, I_l=I₀e^-l/k, k is predetermined coefficient, and coefficient k can be by the diameter of phi of casing, the resistance R of cannula unit length and casing The conductivityσ etc. of surrounding formation is determined.Specifically, depth l is the circle of a micro- annulus on the casing of the first oil well The distance between the heart and decanting point, alternatively, when regarding micro- annulus at as one, depth l is on the casing of the first oil well A micro- annulus and the distance between decanting point.

Casing after energization is equivalent to electromotion straight wire, takes micro- circle that a width is dl ' at the P of any point on casing Ring calculates the magnetic field intensity that micro- annulus generates at the location point Q of magnetic field sensor by Biot-Savart law；Again to whole All micro- annulus dl ' are integrated on a casing, obtain the letter that the magnitude of field intensity that entire casing generates at Q is met Number relationshipWherein, π is pi, and d is pre-determined distance, μ₀For space permeability, μ The magnetic conductivity of the surrounding formation of the casing of one oil well, α are the central shaft of the central axis of the second oil well and the casing of the first oil well Angle between line, angles of the θ between first straight line and second straight line, first straight line are micro- circle on the casing of the first oil well Connection straight line between ring and the location point of Magnetic Sensor, second straight line be by micro- annulus on the casing of the first oil well and It is parallel to the straight line of the central axis of the second oil well, I_lFor current strength of the casing at depth l of the first oil well, and I_l= I₀e^-l/k, k is predetermined coefficient, I₀For the current strength that current source is inputted into the casing of the first oil well, depth l is the first oil The distance between the top of casing of micro- annulus and the first oil well on the casing of well.Wherein, μ can measure before ranging It arrives；I_lIt can be calculated by casing and formation parameter with before boring ranging；α can be measured in real time when carrying out ranging It arrives.

Specifically, Fig. 4 is first in another oil well determination of distance method that the utility model embodiment provides The derivation model schematic of the alternating magnetic field of the casing of oil well, as shown in figure 4, a three-dimensional cartesian coordinate system is established, magnetic sensing It is location point Q that device, which is located at the point on the second oil well, and the second oil well tool there are one central axis, also may be used by the central axis of the second oil well It, will be by the straight line of location point Q and the central axis perpendicular to the second oil well to be referred to as the central axis of the inserting tube of the second oil well Y-axis as three-dimensional cartesian coordinate system；There is first oil well central axis, the central axis of the first oil well may also be referred to as first There are one intersection points for tool between the central axis of the casing of the central axis of the casing of oil well, Y-axis and the first oil well, which is made For the origin O of three-dimensional cartesian coordinate system；Using by origin O and be parallel to the second oil well central axis straight line as three-dimensional The Z axis of rectangular coordinate system；Using both perpendicular to Y-axis and Z axis and by the straight line of origin O as the X of three-dimensional cartesian coordinate system Axis.It can be by the distance between the central axis of Z axis and the second oil well d, as the distance between the first oil well and the second oil well d。

Angle between the central axis of the casing of the central axis of second oil well and the first oil well is α.Due to casing Length is far longer than the diameter and thickness of casing, and so as to which the casing after being powered is equivalent to electromotion straight wire, casing is decomposed Being formed by angle at several micro- annulus dl ', at each micro- annulus dl ' and location point Q of the magnetic field sensor in inserting tube is θ, specifically, angles of the θ between first straight line and second straight line, first straight line is micro- annulus on the casing of the first oil well Connection straight line between P and the location point Q of Magnetic Sensor, second straight line be by micro- annulus on the casing of the first oil well and It is parallel to the straight line of the central axis of the second oil well, wherein P can be the centre point of micro- annulus, can also be regarded as micro- annulus One point P；The distance between location point Q of micro- annulus P and Magnetic Sensor on the casing of first oil well is r.Wherein, distance l ' For the distance between micro- annulus P and origin O.

First, known by Biot-Savart law, a width is micro- annulus of dl ' in magnetic field sensing at certain point P on casing The magnetic induction intensity of generation is at the location point Q of deviceWherein, preferably , μ₀=4 π × 10^-7Tm/A。

Then it needs, derives l ' and θ, the relationship of r and θ；ByIt can obtainThen rightBoth members simultaneously to θ carry out differential, then haveThen, then byIt obtains

Then, willWithIt is updated to In, it is obtained after arranging

Then, according to the relationship dH=dB/ μ of magnetic field intensity dH and magnetic induction intensity dB, the P points of the casing after being energized The magnetic field intensity that micro- annulus that one, place width is dl ' generates

Then, micro- annulus dl ' all on entire casing is integrated, obtains entire casing and is passed in the magnetic field of positive drilling well The magnetic field intensity generated at sensor

It is thus possible to obtain formula

To by calculated amplitude H in step 203, be updated toIn, Ke Yiji Calculation obtains the distance between the second oil well and the first oil well d；From Fig. 4, the distance between the second oil well and the first oil well d, For the distance between the central axis of Z axis and the second oil well.

The present embodiment carries out magnetic by input AC electric current in the casing into drilling well, and then by the casing of drilling well Change, then the Magnetic Sensor in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing of drilling well, ground instrument from And positive drilling well and the distance between drilling well can be calculated according to the amplitude information, which can preferably symbolize The distance between the information of drilling well, and then two adjacent oil wells can be accurately determined out, measurement accuracy is higher；The present embodiment The scheme of offer, can be in the drilling process of positive drilling well, and the distance between detection and adjacent oil well, that is, provide one in real time A offset well is apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by the set of one end of current source and drilling well The top of pipe connects, without any tool of tripping in drilling well, to not influence the normal production of drilling well, and this implementation Example provide apart from detection scheme safe operation, conveniently；And powerful electric current demagnetization casing is used, can effectively be increased Hard magnetization field intensity improves ranging distance and precision, and one is provided effectively for offset well distance measurement and cluster well anticollision Technological means.Also, this gives the specific formula for calculation and method that calculate distance.

Fig. 5 is the flow diagram for another oil well determination of distance method that the utility model embodiment provides.Such as Fig. 5 Shown, this method includes：

Step 301, when the number of the first oil well is N number of, the number of current source is N number of, and N is just whole more than or equal to 2 Number, the first oil well connect correspondingly with current source, each current source in N number of current source to the current source Input current in the casing of corresponding first oil well so that each the first oil well sleeve at alternating magnetic field after, obtain magnetic The casing for each the first oil well that sensor detects is formed by the amplitude of alternating magnetic field, wherein different current sources to The frequency of the electric current inputted in the casing of the first different oil wells is different；Wherein, each first oil well has been completed for one The oil well of drilling well process, Magnetic Sensor are fixed in the second oil well, and the second oil well is one and is carrying out drilling well process The top of the casing of oil well, one end of each current source and the first oil well corresponding with the current source is electrically connected；Each electricity The other end in stream source and the earth are electrically connected or the other end of each current source and third oil well corresponding with the current source The top of casing is electrically connected, and third oil well is the oil well that another has completed drilling well process；Wherein, each current source is another The distance between tie point and the current source of one end and the earth are more than or equal to 50 meters；Each first oil well respectively with third Distance is more than or equal to 50 meters between oil well.

When there is N number of drilling well around the second oil well, wherein N is more than or equal to 2, the i.e. number of the first oil well When being at least two.First, a Magnetic Sensor is fixed in the second oil well, by Magnetic Sensor and ground instrument into Row electrical connection.And it is provided for each first oil well and distinguishes one-to-one current source with each first oil well,

The top of the casing of one end of each current source and the first oil well corresponding with the current source is electrically connected, different The frequency for the electric current that current source is inputted into the casing of the first different oil wells is different.The other end of each current source and the earth Electrical connection, wherein the other end of each current source and the distance between the tie point of the earth and the current source are more than or equal to 50 Rice；Alternatively, the top electrical connection of the casing of the other end of each current source and third oil well corresponding with the current source, third Oil well is that another has completed the oil well of drilling well process, wherein each first oil well distance between third oil well respectively More than or equal to 50 meters.

For each first oil well, the step 101 in principle and Fig. 1 that magnetic field generates, the step 201- in Fig. 2 203 is identical, repeats no more.

Step 302 carries out Fourier transformation to alternating magnetic field signal, obtains each corresponding amplitude of the first oil well.

In the present embodiment, specifically, in the present embodiment, ground instrument is needed to the alternating magnetic field signal in step 301 Fourier transformation is carried out, the amplitude H ' of each the first oil well is can be obtained by after by Fourier transformation.Then ground Instrument needs to subtract the amplitude H ' of each the first oil well into the amplitude H of magnetostatic field corresponding with first oil well first., obtain The final amplitude H " of each the first oil well.And then the amplitude H " of the alternating magnetic field of each oil well can be solved.

For example, there are three mouthfuls of drilling well A, B, C around positive drilling well, and three powerful current sources point may be used It is passed through f simultaneously not into the casing of tri- mouthfuls of wells of A, B, C_A、f_B、f_CLow frequency, the alternating current of three kinds of different frequencies, to positioned at just Magnetic field sensor in drilling well will detect that i.e. magnetic field sensor receives magnetic containing there are three types of the magnetic induction intensity signal of different frequency The amplitude that field intensity information is characterized is that the amplitude of the magnetostatic field of the earth is superimposed with the magnetized alternation magnetic of tri- mouthfuls of casings of A, B, C The amplitude of field, i.e. H₀+H(f_A)+H(f_B)+H(f_C), wherein H (f_A) be drilling well A casing magnetization after the alternating magnetic field that generates Amplitude, H (f_B) be drilling well B casing magnetization after the amplitude of alternating magnetic field that generates, H (f_C) be drilling well C casing magnetization after The amplitude of the alternating magnetic field of generation.The signal that ground instrument transmits Magnetic Sensor carries out Fourier transformation, so as to respectively Find out the amplitude size of the alternating magnetic field of three kinds of frequencies.

In the present embodiment, powerful power supply can also be used by the timesharing of surface power supply switching system to multiple The casing of first oil well injects identical low-frequency ac electric current, and then simplifies ground system.

Step 303, according to each corresponding amplitude of the first oil well, determine the second oil well respectively with each the first oil well The distance between.

In the present embodiment, specifically, for each the first oil well, calculate the second oil well and each first oil well it Between apart from when, the method in step 101 or Fig. 2 in Fig. 1 in step 204-207 may be used and calculated.

For example, around positive drilling well there are three mouthfuls drilling well A, B, C when, for each well, respectively Using the distance calculating method of Fig. 1 or Fig. 2, it may be determined that three mouthfuls of drilling wells respectively with positive drilling well distance d_A、d_BAnd d_C。

The present embodiment by current source to the casing of each the first oil well power so that each the first oil well set Pipe is formed after alternating magnetic field, and the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained；Fu is carried out to the amplitude of alternating magnetic field In leaf transformation, obtain each corresponding amplitude of the first oil well；According to each corresponding amplitude of the first oil well, the second oil is determined Well is respectively the distance between with each the first oil well.So as to positive drilling well respectively with multiple the distance between drilling wells into Row measures.

Fig. 6 is a kind of structural schematic diagram for oil well determination of distance device that the utility model embodiment provides, and Fig. 7 is this A kind of measuring principle schematic diagram for oil well determination of distance device that utility model embodiment provides, as shown in Figure 6 and Figure 7, this The device of embodiment may include：

Ground instrument 61, Magnetic Sensor 62 and current source 63；

One end of current source 63 is electrically connected with the top of the casing 65 of the first oil well 64, and the first oil well 64 is one complete At the oil well of drilling well process；Ground instrument 61 is electrically connected with Magnetic Sensor 62, and Magnetic Sensor 62 is fixed in the second oil well 66, Second oil well 66 is an oil well for carrying out drilling well process；The other end of current source 63 is electrically connected with the earth or electric current The other end in source 63 is electrically connected with the top of the casing of third oil well, and third oil well is the oil that another has completed drilling well process Well；Wherein, the other end of current source 63 and the distance between the tie point of the earth and current source 63 are more than or equal to 50 meters；First Distance is more than or equal to 50 meters between oil well 64 and third oil well.

Current source 63, for powering to the casing 65 of the first oil well 64, so that the casing 65 of the first oil well 64 forms alternation Magnetic field；

Ground instrument 61, the amplitude for obtaining the alternating magnetic field that Magnetic Sensor 62 detects, and according to amplitude, determine second The distance between oil well 66 and the first oil well 64.

In the present embodiment, specifically, the ground instrument 61, Magnetic Sensor 62 in Fig. 6 in dotted line frame and 63 structure of current source At oil well determination of distance device.

First oil well 64 is an oil well for having completed drilling well process, and the second oil well 66 is one and is carrying out spudder The oil well of sequence.During carrying out drilling well to the second oil well 66, need to measure the first oil well 64 and the second oil well 66 in real time The distance between, it is mutually collided to avoid wellbore.

First, a Magnetic Sensor 62 is fixed in the second oil well 66, by Magnetic Sensor 62 and ground instrument 61 into Row electrical connection.A powerful current source 63 is provided, by the top of one end of current source 63 and the casing 65 of the first oil well 64 End is electrically connected；And by the other end of current source 63 and the earth be electrically connected, or by the other end of current source 63 with The top of the casing of one third oil well is electrically connected, wherein third oil well is the oil that another has completed drilling well process Well.Also, the powerful current source 63 is arranged on the ground.

Specifically, the first oil well 64 is a drilling well, and the second oil well 66 is a positive drilling well；It is attached in drilling well site A powerful current source 63 is placed on close ground, which is connected on drilling well-head casing 65；It should The other end that the other end of current source 63 is connected to another drilling well or the current source 63 except 50 meters is connected to 50 meters Except with greatly contact on good copper electrode, and then avoid the formation of short distance circuit and cause electric current can not be along drilling well Casing 65 flow downward.Wherein, above-mentioned copper electrode is the tie point of the other end and the earth of current source 63.

Then, alternating current is injected into the first oil well 64 using powerful current source 63, the alternating current be low frequency, The frequency of powerful electric current, the alternating current is generally less than 30 hertz (Hz), and alternating current size is I₀, so as to by The casing 65 of one oil well 64 is magnetized, and the casing 65 of the first oil well 64 forms an alternating magnetic field.

Due to being provided with a Magnetic Sensor 62 in the second drilling well, Magnetic Sensor 62 is electrically connected with ground instrument 61. To which the casing 65 that Magnetic Sensor 62 can receive the first oil well 64 is formed by the magnetic field intensity information of alternating magnetic field, the magnetic Field intensity information is the amplitude of alternating magnetic field, and in turn, ground instrument 61 can get the alternation magnetic detected by Magnetic Sensor 62 The amplitude of field.

Ground instrument 61 is according to the amplitude of the alternating magnetic field got, according to the oil well distance calculating side provided in the prior art Method, can calculate the distance between the second oil well 66 and the first oil well 64, which is a vector distance.

The present embodiment provides the device being made of ground instrument 61, Magnetic Sensor 62 and current source 63, the one of current source 63 End is electrically connected with the top of the casing 65 of the first oil well 64, and the first oil well 64 is an oil well for having completed drilling well process；Ground Face instrument 61 is electrically connected with Magnetic Sensor 62, and Magnetic Sensor 62 is fixed in the second oil well 66, the second oil well 66 be one just In the oil well for carrying out drilling well process；The other end of current source 63 is electrically connected with the earth or the other end and third of current source 63 The top of the casing of oil well is electrically connected, and third oil well is the oil well that another has completed drilling well process；Current source 63, for The casing 65 of first oil well 64 is powered, so that the casing 65 of the first oil well 64 forms alternating magnetic field；Ground instrument 61, for obtaining magnetic The amplitude for the alternating magnetic field that sensor 62 detects, and according to amplitude, determine between the second oil well 66 and the first oil well 64 away from From.In the present embodiment, by input current in the casing 65 into drilling well, and then the casing of drilling well 65 is magnetized, Then the Magnetic Sensor 62 in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing 65 of drilling well, ground instrument 61 So as to calculate positive drilling well and the distance between drilling well according to the amplitude information, which can preferably characterize The distance between go out the information of drilling well, and then two adjacent oil wells can be accurately determined out, measurement accuracy is higher；This implementation The scheme that example provides, can be in the drilling process of positive drilling well, and the distance between detection and adjacent oil well, that is, provide in real time One offset well is apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by one end of current source 63 and drilling well Casing 65 top connection, without any tool of tripping in drilling well, to not influence the normal production of drilling well, and It is provided in this embodiment apart from detection scheme safe operation, conveniently；And powerful alternating current demagnetization casing 65 is used, Magnetizing field strength can effectively be enhanced, ranging distance and precision is improved, provided for offset well distance measurement and cluster well anticollision One effective technological means.

Fig. 8 is the structural schematic diagram for another oil well determination of distance device that the utility model embodiment provides, and Fig. 9 is The measuring principle schematic diagram for another oil well determination of distance device that the utility model embodiment provides, shown in Fig. 6 and Fig. 7 On the basis of embodiment, as shown in Figure 8 and Figure 9, Magnetic Sensor 62 is located in inserting tube 71, wherein inserting tube 71 is located at the second oil well Between 66 drill bit 76 and non magnetic drill collar 73.

Magnetic Sensor 62 is spirally connected with inserting tube 71.Alternatively, being fixedly connected on inserting tube 71 there are one box is closed, Magnetic Sensor 62 is solid It is fixed to be arranged in closing box；It closes and is provided with sealing ring on the edge of box；It is square or cuboid or cylinder to close box.

It is provided with drilling equipment in second oil well 66.

One end of current source 63 is electrically connected by the first conducting wire with the top of the casing 65 of the first oil well 64；Current source 63 The other end be electrically connected with the earth by the second conducting wire or the other end of current source 63 passes through the second conducting wire and third oil well The top of casing is electrically connected.

In the present embodiment, specifically, Magnetic Sensor 62 is located in inserting tube 71, wherein inserting tube 71 is located at the second oil well 66 Drill bit 76 and non magnetic drill collar between.

The connection type of Magnetic Sensor 62 and inserting tube 71 can be any one of following manner：It is spirally connected, that is, uses screw The outer surface of Magnetic Sensor 62 and the inner surface of inserting tube 71 are spirally connected；Either, there are one being fixedly connected in inserting tube 71 Box is closed, Magnetic Sensor 62 is fixed in closing box, also, it is square or cuboid to close box, needs closing It is provided with sealing ring on the edge of box.

It is provided with drilling equipment in second oil well 66.As it can be seen in figure 9 that carrying out drilling well process to the second oil well 66 When, from ground downwardly direction, it is equipped with drilling rod 72 successively in the second oil well 66, drill collar 73, measurement-while-drilling system 74, visits Pipe 71, Magnetic Sensor 62, power drilling tool 75, drill bit 76 etc..

Also, it by one end of current source 63, is electrically connected by the top of the first conducting wire and the casing 65 of the first oil well 64 It connects；The other end of current source 63 is electrically connected by the second conducting wire with the earth or the other end of current source 63 is by the The top of two conducting wires and the casing of third oil well is electrically connected.

In the present embodiment, by input AC electric current in the casing 65 into drilling well, and then by the casing of drilling well 65 Magnetized, then the Magnetic Sensor 62 in positive drilling well gets the amplitude letter of alternating magnetic field produced by the casing 65 of drilling well Breath, for ground instrument 61 so as to calculate positive drilling well and the distance between drilling well according to the amplitude information, which can The distance between preferably to symbolize the information of drilling well, and then two adjacent oil wells can be accurately determined out, measure essence Degree is higher；Scheme provided in this embodiment, can be in the drilling process of positive drilling well, in real time between detection and adjacent oil well Distance provides an offset well apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by current source 63 One end connect with the top of the casing 65 of drilling well, without any tool of tripping in drilling well, to not influencing drilling well Normal production, and it is provided in this embodiment apart from detection scheme safe operation, conveniently；And use powerful alternating current Magnetization casing 65 is flowed away, magnetizing field strength can be effectively enhanced, improves ranging distance and precision, is offset well distance measurement and clump Formula well anticollision provides an effective technological means.

Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, the distance between the second oil well and the first oil well areWherein, H is the amplitude of alternating magnetic field, and π is pi, and d is pre-determined distance, μ₀It is true Empty magnetic conductivity, μ are the magnetic conductivity of the surrounding formation of the casing 65 of the first oil well 64, and α is the central axis and the of the second oil well 66 Angle between the central axis of the casing 65 of one oil well 64, angles of the θ between first straight line and second straight line, first straight line For micro- annulus on the casing 65 of the first oil well 64 and the connection straight line between the location point of Magnetic Sensor 62, second straight line is warp The straight line of micro- annulus for crossing on the casing 65 of the first oil well 64 and the central axis that is parallel to the second oil well 66, I_lFor the first oil Current strength of the casing 65 of well 64 at depth l, and I_l=I₀e^-l/k, k is predetermined coefficient, I₀It is oily to first for current source 63 The current strength inputted in the casing 65 of well 64, depth l are the micro- annulus and the first oil well on the casing 65 of the first oil well 64 The distance between the top of 64 casing 65.

Ground instrument 61, is specifically used for：When current source 63 is not powered to the casing 65 of the first oil well 64, magnetic sensing is obtained First magnetic field intensity information of the magnetostatic field that device 62 detects, and Fourier transformation is carried out to the first magnetic field intensity information, it obtains The first amplitude of magnetostatic field；When current source 63 is powered to the casing 65 of the first oil well 64, obtain what Magnetic Sensor 62 detected Second magnetic field intensity information, and Fourier transformation is carried out to the second magnetic field intensity information, obtain the second amplitude；Second amplitude is subtracted First amplitude is gone, the amplitude of alternating magnetic field is obtained.

In the present embodiment, it specifically, above procedure may refer to the step 204-207 of Fig. 2, repeats no more.

Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, ground instrument 61 is additionally operable to：In N number of current source 63 Each current source 63 into the casing of first oil well corresponding with the current source 63 64 input current so that each first After the sleeve of oil well 64 is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor 62 detects is obtained, wherein different electricity The frequency for the electric current that stream source 63 is inputted into the casing of the first different oil wells 64 is different, and the number of the first oil well 64 is N number of, N For the positive integer more than or equal to 2, the first oil well 64 is connect correspondingly with current source 63；Alternating magnetic field signal is carried out Fourier transformation obtains each 64 corresponding amplitude of the first oil well；According to each 64 corresponding amplitude of the first oil well, determine Second oil well 66 is respectively the distance between with each the first oil well 64.

In the present embodiment, it specifically, above procedure may refer to each step of Fig. 3, repeats no more.

Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, ground instrument 61 is electrically connected with current source 63；Ground instrument 61, it is additionally operable to send first control signal to current source 63, not powered to the casing 65 of the first oil well 64 with controlling current source 63, It is additionally operable to send second control signal to current source 63, be powered to the casing 65 of the first oil well 64 with controlling current source 63.

In the present embodiment, it specifically, above procedure may refer to the step 201-202 of Fig. 2, repeats no more.

Those skilled in the art will readily occur to the disclosure after considering specification and putting into practice utility model disclosed herein Other embodiments.The utility model is intended to cover any variations, uses, or adaptations of the disclosure, these changes Type, purposes or adaptive change follow the general principles of this disclosure and include that the disclosure is undocumented in the art Common knowledge or conventional techniques.The description and examples are only to be considered as illustrative, the true scope and spirit of the disclosure It is pointed out by following claims.

It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claims System.

Claims

1. a kind of oil well determination of distance device, which is characterized in that including：

Ground instrument, Magnetic Sensor and current source；

One end of the current source is electrically connected with the top of the casing of the first oil well, and first oil well, which is one, have been completed to bore The oil well of well process；The ground instrument is electrically connected with the Magnetic Sensor, and the Magnetic Sensor is fixed in the second oil well, Second oil well is an oil well for carrying out drilling well process；The other end of the current source is electrically connected with the earth, or The other end of the current source is electrically connected with the top of the casing of third oil well, and the third oil well is that another has completed to bore The oil well of well process；Wherein, the distance between the other end of the current source and the tie point of the earth and the current source More than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；

The current source, for powering to the casing of first oil well, so that the sleeve of first oil well is at alternation magnetic ?；

The ground instrument, the amplitude for obtaining the alternating magnetic field that the Magnetic Sensor detects, and according to the amplitude, Determine the distance between second oil well and first oil well.

2. the apparatus according to claim 1, which is characterized in that the Magnetic Sensor is located in inserting tube, wherein the inserting tube Between the probe and non magnetic drill collar of second oil well.

3. the apparatus of claim 2, which is characterized in that the Magnetic Sensor is spirally connected with the inserting tube.

4. the apparatus of claim 2, which is characterized in that it is fixedly connected on the inserting tube there are one closing box, it is described Magnetic Sensor is fixed in the closing box.

5. device according to claim 4, which is characterized in that be provided with sealing ring on the edge of the closing box.

6. device according to claim 4, which is characterized in that the closing box is square.

7. device according to claim 4, which is characterized in that the closing box is cuboid.

8. device according to claim 4, which is characterized in that the closing box is cylinder.

9. according to claim 1-8 any one of them devices, which is characterized in that be provided with drilling well in second oil well and set It is standby.

10. according to claim 1-8 any one of them devices, which is characterized in that one end of the current source is led by first Line is electrically connected with the top of the casing of the first oil well；

The other end of the current source is electrically connected with the earth by the second conducting wire or the other end of the current source is described in Second conducting wire is electrically connected with the top of the casing of the third oil well.