CN111577261A - Underground pulse signal generator, pressure pulse transmission method, drill collar and drilling equipment - Google Patents
Underground pulse signal generator, pressure pulse transmission method, drill collar and drilling equipment Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005540 biological transmission Effects 0.000 title description 40
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/16—Drill collars
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Abstract
The application discloses pulse signal generator in pit, includes the shell, the shell has: the cavity to and respectively with the mud entry and the mud export of cavity intercommunication, be provided with in the cavity: the primary valve body and the secondary valve body are sequentially arranged along the flowing direction of the slurry; the primary rotating piece is used for driving the primary valve body to rotate, the secondary rotating piece is used for driving the secondary valve body to rotate, and the primary rotating piece and the secondary valve body are driven by mud to rotate; and the mud displacement adjusting unit is used for adjusting the overflow quantity of the overflow channel, so that the difference value of the mud displacement flowing through the primary rotating member and the mud displacement flowing through the secondary rotating member is an adjustable variable, and the primary valve body and the secondary valve body can operate at an adjustable rotation speed difference. The application also discloses a method for transmitting pressure pulses in fluid by using the signal generator, and a drill collar and drilling equipment with the signal generator. The application can obtain adjustable signal frequency to adapt to different well depths.
Description
Technical Field
The application belongs to the technical field of petroleum underground instruments, and particularly relates to an underground pulse signal generator, a pressure pulse transmission method, a drill collar and drilling equipment.
Background
In petroleum drilling, particularly in the process of drilling a highly deviated well, a horizontal well, a multilateral well and other special process wells with complex structures, operators are required to master various underground process parameters in real time, monitor drilling tracks, timely adjust and optimize the drilling parameters, correct the drilling tracks and achieve the purpose of safe and efficient drilling, so that the real-time transmission rate, the accuracy and the like of measurement data while drilling become important influence factors of drilling operation.
Measurement while drilling and logging while drilling refer to the measurement of downhole information by a measurement instrument near the drill bit and transmission to the surface during drilling. By means of measurement while drilling and logging while drilling technologies, information which is difficult to measure on the ground can be measured, such as the torque, the weight on bit, the inclination angle, the azimuth angle, the tool face angle, the axial tension, the three-phase acceleration, formation rock physical parameters, gamma rays reflecting formation characteristics, resistivity and the like of the underground drill bit. The information can be acquired in real time by utilizing measurement while drilling and well logging technologies, and data processing is carried out on the information through a ground software system of measurement while drilling, so that an operator can conveniently master the working state of the drill bit in real time, the structure and simulation of a bottom layer while drilling are realized, stratum evaluation is completed, and the drill bit can efficiently advance in an oil-gas layer.
With the development of measurement while drilling and logging while drilling technologies, various logging while drilling instruments such as an azimuth lateral resistivity imaging logging while drilling instrument, a gamma imaging logging while drilling instrument and the like are successively put into application, the accuracy of the measurement while drilling and the logging technology depends on the authenticity and rapidity of underground information, and the key technologies of the measurement while drilling and the logging technology are a carrier, a transmission tool and a transmission rate of underground information transmission, signal receiving, signal processing, decoding and the like of the underground information transmission on the ground. The underground information transmission is divided into two modes of wired transmission and wireless transmission, and the wireless transmission is widely applied due to less limitation in the underground operation process at present.
The existing wireless transmission modes are mainly divided into sound wave, electromagnetic wave and mud pulse transmission according to the difference of a transmission channel and a transmission medium. Wherein, the sound wave transmission technology does not solve the problems of noise, attenuation and the like at present, so the sound wave transmission technology is in a test research stage; the electromagnetic wave transmission technology is greatly influenced by well depth and geological conditions, and the application range is limited; the mud pulse transmission technology is generated by means of a mud pulse generator and is currently in commercial use as a wide range.
The mud pulse transmission method is divided into negative pulse, positive pulse and continuous wave signal transmission according to different types of mud pulses. The negative pulse signal generator has the defects of pollution, low signal rate and large energy loss; the positive pulse mud signal generator is widely applied at present, and generally realizes the uploading of mud pulse signals by controlling the principle that the mushroom head blocks a mud channel, but the transmission rate of the positive pulse mud signal generator is generally lower than 0.5-5bit/s, and the positive pulse mud signal generator cannot meet the requirement of simultaneously uploading a plurality of groups of measurement parameters while drilling and logging parameters in real time; moreover, the negative pulse transmission and the positive pulse belong to baseband transmission, so that the transmission rate is low, the reliability is poor, and error codes are easily generated by interference; continuous wave signal transmission belongs to frequency band transmission, and compared with negative pulse transmission and positive pulse transmission, the transmission rate of continuous wave signal transmission is much faster, and meanwhile, the method has the advantages of high reliability and strong anti-interference capability, so that the continuous wave signal transmission has a better application prospect.
The continuous wave signal generator controls the rotor of the rotary valve to move according to a certain rule through the motor so as to change the flow area of mud liquid, different drilling fluid flow areas generate drilling fluid pressure signals with different amplitudes, and the transmission of underground data is realized by utilizing the drilling fluid pressure signals. Specifically, the change of amplitude, frequency and phase of a sinusoidal pressure wave signal of the mud drilling fluid can be realized by controlling the operation mode of the rotor, so that the modulation of measurement while drilling data is realized, and the data transmission rate of the continuous wave signal generator is much faster than that of a mud negative pulse generator and a mud positive pulse generator and can reach 40bit/s at most.
The rotary valve rotor can be divided into a swinging shear valve type continuous signal generator and a continuous rotary valve type continuous wave signal generator according to different movement modes of the rotary valve rotor. Both the swing shear valve type continuous signal generator and the continuous rotary valve type continuous wave signal generator face a series of common problems. Firstly, the problem of motor control is solved, the motor is used as a driving source of a rotor, and the control precision of the motor often has great influence on the generation of signals, so that the precision requirement of motor control is very high, the underground working environment is severe, the motor needs to have the characteristics of high temperature resistance and scouring resistance, in the actual operation process, the motor can be influenced by hydraulic impact, the load is a variable uncertain quantity, and the problem that what kind of control method is adopted to improve the control precision of the motor is difficult to realize technically. Particularly for the swing shear valve type continuous signal generator, the motor needs to be controlled to continuously rotate forwards and backwards, the requirement on the motor is high, and the situation that the motor can not rotate to a set position even when the rotor meets large resistance can occur. Secondly, the power consumption of the system is the problem, the load water moment needs to be overcome in the process of driving the rotor to move by the motor, a high-frequency oscillation signal needs to be generated, the power consumption of the system is very large, and the operation performance of the motor can be seriously influenced by unknown disturbance generated by hydraulic torque. Furthermore, the downhole temperature increases with increasing well depth, and changes in temperature will tend to cause changes in motor control parameters.
Patent US20180291733a1 discloses a device for generating low frequency pressure pulses downhole, comprising a housing and a rotary valve arranged in the housing, the rotary valve comprising a first valve part and a second valve part, the first valve part being rotated by a first turbine, the second valve part being rotated by a second turbine, the first turbine and the second turbine having the same displacement-rotation characteristics, i.e. the slopes of the displacement-rotation speed curves of the first turbine and the second turbine are equal, so that the first valve part and the second valve part, although being capable of rotating at different rates, are capable of obtaining a stable fixed value frequency for stable transmission of the pulse signal. However, in the drilling process, with the increase of the well depth, the drilling working condition becomes more and more complex, the more the downhole data to be measured, the more the borehole trajectory data and the geological data need to be measured, and the data such as the downhole vibration, the bit weight, the torque, the borehole diameter expansion rate, the dielectric constant and the like need to be measured, the size of the data transmission quantity is closely related to the signal frequency, and the pressure pulse device disclosed in the above patent generates a fixed value frequency, which cannot meet the requirements of different well depths on the data information quantity.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
The application provides a downhole pulse signal generator, a method for transmitting pressure pulse, a drill collar and drilling equipment, and aims to solve at least one technical problem.
The technical scheme adopted by the application is as follows:
a downhole pulse signal generator comprising a housing having: the cavity, and respectively with mud entry and the mud export of cavity intercommunication, be provided with in the cavity: the rotary valve comprises a primary valve body and a secondary valve body which are sequentially arranged along the flowing direction of the slurry, and the primary valve body and the secondary valve body can rotate at different speeds to change the flow area of the slurry at the rotary valve; a primary rotor for driving rotation of the primary valve body, the primary rotor being driven in rotation by the mud; a secondary rotor for driving rotation of the secondary valve body, the secondary rotor being driven in rotation by the mud; the slurry discharge regulating unit comprises an overflow channel capable of distributing slurry, and the overflow channel is arranged on the primary valve body or the secondary valve body; the mud displacement regulating unit further comprises a regulating mechanism, the regulating mechanism is used for regulating the overflow quantity of the overflow channel, so that the difference value of the mud displacement flowing through the primary rotating member and the mud displacement flowing through the secondary rotating member is an adjustable variable, and the primary valve body and the secondary valve body can operate at an adjustable rotation speed difference.
The downhole pulse signal generator in the present application also has the following additional technical features:
the adjusting mechanism comprises a flow-limiting piece and a driving piece for driving the flow-limiting piece to move, the overflow channel is provided with an overflow outlet, and the flow-limiting piece is provided with a flow-limiting part capable of opening, closing or partially shielding the overflow outlet; the overflow outlet is a variable cross-section through opening, and/or the flow limiting part is of a structure with a variable cross section, and the driving piece changes the overflow area at the overflow outlet by controlling the movement amount of the flow limiting piece so as to change the overflow amount of the overflow channel.
The flow limiting piece is driven by the driving piece to do linear motion.
The movement direction of the flow-limiting piece is parallel to the axial direction of the overflow outlet.
The secondary valve body is provided with a secondary matching part which is matched with the primary valve body to change the flow area of the mud at the rotary valve, and a secondary connecting part which is fixedly connected with the secondary matching part and is connected with the secondary rotary part, and the overflow channel is arranged on the secondary connecting part.
The primary valve body is provided with a primary matching part which is matched with the secondary valve body to change the flow area of the slurry at the rotary valve, and a primary connecting part which is fixedly connected with the primary matching part and is connected with the primary rotating part, and the primary rotating part is sleeved on the outer side of the primary connecting part; the secondary rotating part is sleeved on the outer side of the secondary connecting part.
The primary rotating part is in key connection with the primary valve body, and the secondary rotating part is in key connection with the secondary valve body.
The present application also discloses a method for transmitting pressure pulses in a fluid, the method comprising: providing a pulse signal generator comprising a housing having: the cavity, and respectively with mud entry and the mud export of cavity intercommunication, be provided with in the cavity: the rotary valve comprises a primary valve body and a secondary valve body which are sequentially arranged along the flowing direction of the slurry, and the primary valve body and the secondary valve body can be mutually matched to change the flow area of the slurry at the rotary valve; a primary rotor for driving rotation of the primary valve body, the primary rotor being driven in rotation by the mud; a secondary rotor for driving rotation of the secondary valve body, the secondary rotor being driven in rotation by the mud; the mud displacement adjusting unit comprises an overflow channel capable of dividing mud, and the overflow channel is arranged on the rotary valve, the primary rotary piece and/or the secondary rotary piece; the mud displacement regulating unit further comprises a regulating mechanism, the regulating mechanism is used for regulating the overflow quantity of the overflow channel so that the difference value of the mud displacement flowing through the primary rotating member and the mud displacement flowing through the secondary rotating member is an adjustable variable, and the primary valve and the secondary valve can operate at an adjustable speed difference;
flowing mud through the pulse signal generator;
adjusting the overflow amount of the overflow channel by the slurry discharge amount adjustment unit to adjust the difference in the slurry discharge amounts of the primary and secondary rotating members;
a pressure wave signal having an adjustable frequency is generated.
The application also discloses a drill collar, which comprises a shell, wherein the underground pulse signal generator is arranged in the shell.
The application also discloses drilling equipment, which comprises a drill string and a drill bit, and the equipment also comprises a drill collar for connecting the drill string and the drill bit, wherein the drill collar is the drill collar; the hollow cavity is internally provided with a control unit and a data acquisition unit used for transmitting downhole data to the control unit, the data acquisition unit comprises a measurement while drilling instrument and/or a logging while drilling instrument, the control unit comprises a control module, a modulation module and a ground demodulation module, the control module is used for controlling the adjusting mechanism, and the modulation module is used for encoding and modulating the downhole data into mud pressure waves and transmitting the data to the ground demodulation module through the pulse generator.
Due to the adoption of the technical scheme, the beneficial effects obtained by the application are as follows:
1. in this application elementary rotation piece with secondary rotation piece is rotatory by mud drive, thereby drives elementary valve body with secondary valve body is rotatory, and its make full use of the kinetic energy of mud has realized the no motor drive of commentaries on classics valve, has not only reduced the consumption by a wide margin, has promoted the security of instrument in the pit, has reduced the control degree of difficulty moreover.
In addition, the signal generator is also provided with a mud displacement adjusting unit, the mud displacement adjusting unit comprises an overflow channel capable of shunting mud and an adjusting mechanism for adjusting the overflow quantity of the overflow channel, so that the difference value of the mud displacement flowing through the primary rotating part and the mud displacement flowing through the secondary rotating part is an adjustable variable, the primary valve body and the secondary valve body can run at an adjustable rotating speed difference, further, the pulse signal frequency and the information transmission rate which can be adjusted in a large range can be obtained, different signal quantity carrying capacities can be obtained at different well depth positions, finally, data information of different carrying capacities can be obtained according to different well depths, the pulse signal frequency can be adjusted without replacing the primary rotating part and the secondary rotating part, and the real-time on-line adjustment of downhole operation is realized, and the smooth drilling operation is guaranteed.
2. As a preferred embodiment of the present application, the adjusting mechanism includes a flow-limiting member and a driving member for driving the flow-limiting member to move, the overflow channel has an overflow outlet, the overflow outlet is a cross-section-variable opening, and/or the flow-limiting portion has a cross-section-variable structure, the driving member can change an overflow area at the overflow outlet by controlling a movement amount of the flow-limiting member, so as to change an overflow amount of the overflow channel, thereby adjusting a slurry discharge amount flowing through the primary rotating member and the secondary rotating member, and finally achieving a purpose of adjusting a difference between a primary valve body and a secondary valve body in rotation speed. In this application the regulation mode of overflow volume is convenient, swift, and easy control, further, through the overflow export and/or the cross-sectional design of current-limiting part can assist the infinitely variable control who realizes primary valve body and secondary valve body rotational speed difference, and it has not only enlarged the scope of signal frequency control, can adjust assorted signal frequency to different well depths, has satisfied different well depths and has located the requirement to data information volume, and this infinitely variable control's mode is little to the impact of elementary rotation piece, elementary valve body, secondary rotation piece, secondary valve body, has guaranteed signal generator working property's reliability and stability, and helps prolonging signal generator's life.
3. As a preferred embodiment of this application, the current-limiting piece is in make linear motion under the drive of driving piece, the direction of motion of current-limiting piece with the axis direction of overflow export is parallel, to change through the motion of current-limiting piece the overflow volume of overflow passageway, linear motion's mode reliability is higher, and the assembly between each part is littleer with the shared installation space of transmission, thereby helps reducing signal generator's size, and signal generator's reduction of size has not only reduced whole signal generator's cost of manufacture, has promoted the reliability of signal generator operation process moreover, specifically speaking, small-size signal generator helps whole drill collar's miniaturization, and drill collar's miniaturization helps promoting its flexibility, in the complicated operating mode of borehole operation, has made things convenient for turning, the attitude adjustment etc. of drill collar, thereby contributing to the reliability and stability of the whole working process.
4. As a preferred embodiment of the present application, the overflow path is provided in the secondary connection portion of the secondary valve body, so that the flow of the slurry of the secondary rotating member is less than or equal to the flow of the slurry of the primary rotating member, the flow process and the final confluence process of the whole slurry are smoother, and the structural design of the signal generator is facilitated, the reduction of the radial dimension and the axial dimension of the signal generator is facilitated, and the reliability of the working performance of the signal generator is improved.
5. As a preferred embodiment of this application, the primary rotation spare cover is arranged in the outside of the primary connecting portion of primary valve body, the secondary rotation spare cover is arranged in the outside of the secondary connecting portion of secondary valve body, compare in the mode of realizing being connected of valve body and rotation piece through mechanical transmission parts such as shaft coupling, transmission shaft, this embodiment can shorten pulse signal generator's axial length by a wide margin, increases the reliability of its work, especially is convenient for its flexibility in the turn department in the pit.
Further, elementary rotation piece with elementary valve body key-type connection, secondary rotate the piece with secondary valve body key-type connection realizes the assembly of rotating piece and valve body through the key-type connection, and is good to neutrality, and not only simple to operate helps promoting assembly efficiency, and it is also convenient to dismantle moreover, can conveniently realize the change of rotating the piece, and through changing the rotation piece, also can realize the displacement regulation of elementary, secondary rotation piece, thereby enlarged signal generator's application scope.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a cross-sectional view of one embodiment of a signal generator described herein, with the direction of the arrows showing the direction of mud flow.
Fig. 2 is an enlarged view of a portion a of fig. 1, in which the direction of the arrows shows the flow direction of the slurry.
Fig. 3 is a state diagram of the adjusting mechanism according to an embodiment of the present application, in which the direction of the arrows shows the flow direction of the slurry.
Fig. 4 is another state diagram of the adjusting mechanism according to an embodiment of the present application, in which the direction of the arrows shows the flow direction of the slurry.
Fig. 5 is a front view of the primary valve body in an embodiment of the present application.
Fig. 6 is a sectional view taken along line a-a of fig. 5.
Fig. 7 is a perspective view of the primary rotor according to an embodiment of the present application.
Fig. 8 is a schematic view of the state of the adjustment mechanism according to embodiment 1 of the present application.
Fig. 9 is a schematic view of the state of the adjustment mechanism according to embodiment 2 of the present application.
Fig. 10 is a schematic view of the state of the adjustment mechanism according to embodiment 3 of the present application.
Fig. 11 is a schematic view of the state of the adjustment mechanism according to embodiment 4 of the present application.
Wherein,
1, a shell; 2 a primary valve body support; a 3 bond; 4 a primary valve body; 5 a primary rotation member; 6 a secondary valve body; a 7 bond; 8 a secondary rotating member; 9 a secondary valve body support; 10. 101, 102, 103 overflow outlets; 11. 1101, 1102, 1103 flow restrictor; 12 an electronic bin; 13 balancing the plunger; 14 a drive member; 15 pressure-bearing sealed connectors; 16 a control module; 17 measuring instrument while drilling and/or logging instrument while drilling; 18 a drain hole; 19 an overflow inlet; 20 a slurry inlet; 21 a slurry outlet; 22 overflow channel.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationship shown in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, a downhole pulse signal generator includes a housing 1, the housing 1 having: the cavity, and respectively with mud entry 20 and the mud export 21 of cavity intercommunication, be provided with in the cavity: the rotary valve comprises a primary valve body 4 and a secondary valve body 6 which are sequentially arranged along the slurry flowing direction, and the primary valve body 4 and the secondary valve body 6 can be mutually matched to change the flow area of slurry at the rotary valve; a primary rotor 5 for driving the primary valve body 4 to rotate, the primary rotor 5 being driven to rotate by the slurry; a secondary rotor 8 for driving the secondary valve body 6 in rotation, said secondary rotor 8 being driven in rotation by the mud. In this application elementary rotation piece 5 with the rotation of secondary rotation piece 8 is changed into mud drive by traditional motor drive to overcome the problem that operation, control etc. of borehole operation environment for the motor brought, its make full use of the kinetic energy of mud, realized the no motor drive who changes the valve, not only reduced the consumption by a wide margin, promoted the security of instrument in the pit, reduced the control degree of difficulty moreover.
In the drilling process, mud enters the hollow cavity from the mud inlet 20 and flows through the primary rotating part 5 and the secondary rotating part 8 respectively to drive the primary rotating part 5 and the secondary rotating part 8 to rotate, so as to drive the primary valve body 4 and the secondary valve body 6 to rotate, finally the flow area of the mud at the rotary valve is changed, and pressure signals with different amplitudes can be generated according to different mud flow areas.
Unlike conventional motor-controlled rotary valves that continuously move periodically to cut mud to produce a mud signal, the adjustment of the mud signal frequency in this application is aided by a mud displacement adjustment unit as described below.
Specifically, as shown in fig. 1 to 11, a mud displacement adjusting unit is further disposed in the hollow cavity, the mud displacement adjusting unit includes an overflow channel 22 capable of splitting mud, the mud displacement adjusting unit further includes an adjusting mechanism, the adjusting mechanism is configured to adjust an overflow amount of the overflow channel 22, so that a difference between a mud displacement flowing through the primary rotating member 5 and a mud displacement flowing through the secondary rotating member 8 is an adjustable variable, and the primary valve body 4 and the secondary valve body 6 can operate at an adjustable differential rotation speed, so that an adjustable signal frequency can be obtained, and requirements for different downhole data information collection amounts at different well depth positions in a drilling process can be met.
It should be noted that the location of the overflow channel 22 is not specifically limited in this application. For example, in one particular embodiment, the relief passage 22 is provided in the primary valve body 4. As another example, in another specific embodiment, the relief passage 22 is provided in the secondary valve body 6. Taking the overflow channel 22 provided in the secondary valve body 6 as an example, part of mud leaks into the overflow channel 22 during drilling so that the mud flowing through the primary rotating member 5 and the mud flowing through the secondary rotating member 8 have different displacement volumes, thereby generating a rotation speed difference between the primary valve body 4 and the secondary valve body 6, during rotation of the primary valve body 4 and the secondary valve body 6, the flow area of the mud channel (generated by the cooperation of the primary valve body 4 and the secondary valve body 6) on the rotary valve changes due to the difference of the rotation speed, thereby generating a mud pressure wave signal with periodic characteristics, and the magnitude of the rotation speed difference determines the frequency of the mud pressure wave signal.
As a preferred embodiment of the present application, the primary rotor 5 and the secondary rotor 8 are each a turbine, as shown in fig. 7, which gives a specific structural example of the turbine, but the configuration of the turbine in the present application is not limited to the structure shown in the drawings, and other structural types may be adopted. Moreover, the present application gives a specific example of a turbine in which the primary rotor 5 and the secondary rotor 8 are of identical structural configuration. However, the present application is not limited thereto, and the primary rotor 5 and the secondary rotor 8 may adopt turbines having different structural shapes, so as to change the displacement-rotation speed characteristics of the primary rotor 5 and the secondary rotor 8 based on the adjustment of the displacements of the primary rotor 5 and the secondary rotor 8 by the mud displacement adjustment unit, further by the difference of the turbine structures of the primary rotor 5 and the secondary rotor 8.
As shown in fig. 5 and fig. 6, a specific structure example of the primary valve body 4 and the secondary valve body 6 is given, and it can be seen from the figure that, in this example, the primary valve body 4 and the secondary valve body 6 both have two valve plates, however, the structure of the primary valve body 4 and the secondary valve body 6 in the present application is not limited to this, and a structure of four valve plates, etc. may also be adopted. Of course, the primary valve body 4 and the secondary valve body 6 in the present application can be completely different in structure, and as long as the change of the mud flow area can be generated in the relative movement process, a mud pressure wave signal with a certain frequency can be generated.
As a preferred embodiment of the present application, the adjusting mechanism comprises a flow restriction 11 and a driving member 14 for driving the flow restriction 11 to move, the overflow channel 22 has an overflow inlet 19 and an overflow outlet 10, and the flow restriction 11 has a flow restriction capable of opening, closing or partially blocking the overflow outlet 10. The flow limiting member 11 in this embodiment is not only in two working states of opening or closing the overflow outlet 10, but also in a working state of partially shielding the overflow outlet 10, thereby increasing the diversity of overflow amount adjustment and laying a foundation for obtaining mud pressure wave signals of different frequencies. The adjusting mode of the overflow quantity in the embodiment is convenient and fast, and is easy to control.
The present embodiment does not specifically limit the movement manner of the flow restriction member 11:
in a specific example, the flow-limiting piece 11 is driven by the driving piece 14 to rotate to open, close or partially shield the overflow outlet 10.
As a preferred embodiment of the present embodiment, the current limiting member 11 is driven by the driving member 14 to perform a linear motion, and compared with the above-mentioned rotational motion, the linear motion has higher reliability, and the installation space occupied by the assembly and transmission among the components is smaller, thereby contributing to reducing the size of the signal generator, and the reduction of the size of the signal generator not only reduces the manufacturing cost of the whole signal generator, but also improves the reliability of the operation process of the signal generator, specifically, the signal generator with a small volume contributes to the miniaturization of the whole drill collar, and the miniaturization of the drill collar contributes to the improvement of the flexibility of the drill collar, and in the complex working condition of downhole operation, the turning, posture adjustment and the like of the drill collar are facilitated, thereby contributing to the reliability and stability of the whole operation process. And the linear motion is in two modes, one mode is that the motion direction of the flow-limiting piece 11 is perpendicular to the axial direction of the overflow outlet 10, and the other mode is that the motion direction of the flow-limiting piece 11 is parallel to the axial direction of the overflow outlet 10, as a preferable example, the motion direction of the flow-limiting piece 11 is parallel to the axial direction of the overflow outlet 10, so that the radial size of the signal generator is reduced, and the miniaturization of the signal generator is facilitated.
It should be noted that, in the present embodiment, the specific composition of the driving member 14 is not limited: for example, in a specific example, the driving element 14 is a motor, and the motor is connected to the limiting element through a linear transmission mechanism such as a ball screw assembly, so as to drive the limiting element to perform a linear motion; for another example, in another specific example, the driving member 14 is a hydraulic cylinder or an air cylinder, and the limiting member is driven to move linearly by the hydraulic cylinder or the air cylinder; for another example, the driving member 14 is a solenoid valve driving assembly, and the limiting member is driven by the solenoid valve driving assembly to perform a linear motion. Of course, the driving member 14 in the present embodiment is not limited to the above example, and other structures may be adopted.
The inside of the hollow cavity is provided with an electronic bin 12, the electronic bin 12 is provided with a cavity for accommodating the driving piece 14, and the cavity is isolated from slurry, so that even if the driving piece 14 adopts a motor structure and the like, the driving piece 14 cannot be influenced by the slurry, and the working stability and the control performance of the driving piece are not influenced by the slurry.
In this embodiment, the overflow outlet 10 and the flow restrictor 11 may adopt any one of the following embodiments to adjust the overflow amount of the overflow outlet 10 by the cooperation of the two:
example 1: the overflow outlet 10 is a variable cross-section port, and for convenience of description, a side where the slurry enters the overflow outlet 10 is referred to as an inlet side, and a side where the slurry flows out of the overflow outlet 10 is referred to as an outlet side, as shown in fig. 8, which shows a specific example that the cross-sectional area of the overflow outlet 101 gradually increases from the inlet side to the outlet side, but the embodiment is not limited thereto, and in another specific example, the cross-sectional area of the overflow outlet 10 gradually decreases from the inlet side to the outlet side, so that the overflow outlet 10 is a variable cross-section port.
In the present embodiment, as shown in fig. 8, the flow-restricting portion is a surface with a fixed cross-sectional area, and the driving member 14 changes the overflow area at the overflow outlet 10 by controlling the movement amount of the flow-restricting member 1101, so as to change the overflow amount of the overflow channel 22. In the following, the present embodiment will be further described in detail by taking the structure shown in fig. 8 as an example, where the depth of the flow restriction 1101 entering the overflow outlet 101 under the driving of the driving element 14 is larger, or when the flow restriction 1101 is closer to the inlet side under the driving of the driving element 14, the overflow amount of the overflow outlet 101 per unit time is smaller, the displacement difference between the primary rotor 5 and the secondary rotor 8 per unit time is smaller, and the rotation speed difference between the primary valve body 4 and the secondary valve body 6 is smaller.
The embodiment can assist in realizing stepless regulation of the rotating speed difference between the primary valve body 4 and the secondary valve body 6, not only enlarges the signal frequency regulation range, can regulate matched signal frequency according to different well depths, and meets the requirements of different well depths on data information quantity, but also has small impact on the primary rotating piece 5, the primary valve body 4, the secondary rotating piece 8 and the secondary valve body 6 in a stepless regulation mode, ensures the reliability and stability of the working performance of the signal generator, and is beneficial to prolonging the service life of the signal generator.
Example 2: unlike embodiment 1, in this embodiment, as shown in fig. 9, the overflow outlet 102 is provided with a plurality of protruding steps from the inlet side to the outlet side, and the inner diameters of the steps are different, so that the overflow outlet 102 is a variable cross-section passage. The flow restriction is a surface with a fixed cross-sectional area, and the driving member 14 changes the overflow area at the overflow outlet 102 by controlling the movement amount of the flow restriction 1101, so as to change the overflow amount of the overflow channel 22.
Example 3: in this embodiment, as shown in fig. 10, the cross-sectional area of the overflow outlet 103 is uniform from the inlet side to the outlet side, the flow-limiting portion of the flow-limiting member 1102 has a variable cross-section structure, for convenience of description, an end of the flow-limiting member 1102 close to the driving member 14 is referred to as a connecting end, and an end of the flow-limiting member 1102 far from the driving member 14 is referred to as a free end, as shown in fig. 10, in a specific example in this embodiment, the cross-sectional area of the flow-limiting portion gradually increases from the free end to the connecting end. However, the present embodiment is not limited thereto, and in another specific example, the cross-sectional area of the flow restriction portion is gradually reduced from the free end toward the connection end.
When the flow-limiting member 1102 enters the overflow outlet 103 at different depths under the driving of the driving member 14, the discharge amount of the slurry flowing out of the overflow outlet 103 per unit time is different, so that the discharge amount of the slurry flowing through the primary rotating member 5 and the secondary rotating member 8 per unit time is changed, and the rotation speeds of the primary valve body 4 and the secondary valve body 6 are adjusted.
Example 4: in this embodiment, as shown in fig. 11, the cross-sectional areas of the overflow outlets 103 are uniform from the inlet side to the outlet side, and the flow restricting portion of the flow restrictor 1103 has a variable cross-sectional structure, which is different from that of embodiment 3 described above, in this embodiment, as shown in fig. 11, the flow restricting portion is provided with a plurality of step surfaces having different cross-sectional areas from the free end to the connection end, and the relative positions of the flow restrictor 1103 and the overflow outlets 103 are controlled to change the amount of overflow of the overflow outlets 10 per unit time.
Example 5: in this embodiment, the overflow outlet 10 is a variable cross-section through opening, the specific structure thereof may be any of the above embodiments 1 and 2, the flow restricting portion has a variable cross-section, the specific structure thereof may be any of the above embodiments 3 and 4, and the driving member 14 changes the overflow area at the overflow outlet 10 by controlling the movement amount of the flow restricting member 11, so as to change the overflow amount of the overflow passage 22.
As shown in fig. 2 to 4, the present application will be further described in detail below by taking the overflow outlet 10 as a fixed cross section and the flow restriction part of the flow restriction 11 as a variable cross section:
when the restriction 11 is in the position shown in fig. 2, the overflow outlet 10 is fully open, the overflow passage 22 will discharge a part of the displacement volume, and the primary rotor 5 and the secondary rotor 8 will generate a speed difference, and the primary valve body 4 and the secondary valve body 6 will generate a mud pressure wave with frequency f 1;
when the restriction 11 is in the position shown in fig. 3, the overflow outlet 10 is partially blocked by the restriction 11, and the overflow volume of the overflow outlet 10 per unit time will beThe discharge volume of the slurry flowing through the secondary rotor 8 is increased, the rotational speed difference between the primary rotor 5 and the secondary rotor 8 is reduced, the rotational speed difference between the primary valve body 4 and the secondary valve body 6 is reduced, and the primary valve body 4 and the secondary valve body 6 generate a frequency f in comparison with the fully opened state of the overflow outlet 102Pressure wave of mud, f2<f1；
When the restriction 11 is in the position shown in fig. 4, the overflow outlet 10 is completely covered by the restriction 11, the mud displacement of the primary rotor 5 and the secondary rotor 8 is the same, the rotational speed difference between the primary valve body 4 and the secondary valve body 6 is no longer present, and the frequency of the mud pressure wave is 0.
When the overflow mouth with when the current-limiting piece 11 adopts more changeable cross-sectional structure than in fig. 2 to fig. 4, through control the displacement volume of current-limiting piece 11 can obtain more mud pressure wave signals of different frequencies to in the well depth position department of difference, obtain different semaphore capacity, finally can obtain the data information of different capacities according to the well depth of difference, can not change primary rotation piece 5 and secondary rotation piece 8, can realize the regulation of pulse signal frequency, realized the real-time on-line adjustment of borehole operation, provide the guarantee for the smooth of drilling operation.
The secondary valve body 6 has a secondary fitting portion that is fitted with the primary valve body 4 to change a flow area of the slurry at the rotary valve, and a secondary connecting portion that is fixedly connected to the secondary fitting portion and is coupled to the secondary rotary member 8. As a preferred embodiment of the present application, the overflow path 22 is opened at the secondary connection portion, so that the slurry volume flowing through the secondary rotation member 8 is less than or equal to the slurry volume flowing through the primary rotation member 5, the flowing process and the final converging process of the whole slurry are smoother, and the structural design of the signal generator is facilitated, which facilitates the reduction of the radial size and the axial size of the signal generator, thereby improving the reliability of the working performance of the signal generator.
The overflow channel 22 further includes an overflow inlet 19, the overflow inlet 19 is disposed on the secondary connecting portion, the number of the overflow inlets 19 is not particularly limited in the present application, and the secondary connecting portion may be provided with one overflow inlet 19 or a plurality of overflow inlets 19. Preferably, the secondary connecting portion is provided with a plurality of overflow inlets 19 at intervals along the circumferential direction thereof, and further, the plurality of overflow inlets 19 are uniformly distributed along the circumferential direction of the secondary connecting portion, so that the flow of the slurry is facilitated, the pressure distribution of the slurry on the secondary valve body 6 is prevented from being uniform, a part of the slurry can smoothly enter the overflow channel 22 through the overflow inlets 19, and the other part of the slurry can smoothly flow to the secondary rotating member 8 and flow out through the slurry outlet 21.
As a preferred embodiment of the present application, as shown in fig. 1, the included angle between the axial direction of the overflow inlet 19 and the flow direction of the slurry is an acute angle, so that the slurry in the overflow part can easily flow into the overflow channel 22 in compliance with the overall flow direction of the slurry, the turbulence level is reduced, the chaotic oscillation of the slurry is reduced, the interaction force between the slurry layer and the slurry layer is reduced, the flow of the slurry is facilitated, and the impact wear of the slurry on the secondary valve body 6 at the overflow inlet 19 is reduced.
The primary valve body 4 has a primary fitting portion that is fitted with the secondary valve body 6 to change a flow area of the slurry at the rotary valve, and a primary connecting portion that is fixedly connected to the primary fitting portion and is coupled to the primary rotary member 5. As a preferred embodiment of the present application, the primary rotation member 5 is sleeved outside the primary connection portion; the secondary rotating part 8 is sleeved on the outer side of the secondary connecting part, and compared with a mode of connecting the valve body and the rotating part through mechanical transmission parts such as a coupler and a transmission shaft, the axial length of the pulse signal generator can be greatly shortened, the working reliability of the pulse signal generator is improved, and the flexibility of the pulse signal generator at a turning position in a well is particularly facilitated.
Further, as shown in fig. 1, the primary rotation piece 5 with the primary valve body 4 is connected through the key 3, the secondary rotation piece 8 with the secondary valve body 6 is connected through the key 7, realizes the assembly of rotating the piece and the valve body through the key-type connection, and is good to neutrality, and not only simple to operate helps promoting assembly efficiency, and it is also convenient to dismantle in addition, can conveniently realize the change of rotating the piece, through changing the rotation piece, also can realize the displacement regulation of the primary and secondary rotation pieces 8, thereby has enlarged signal generator's application scope.
As shown in fig. 1, a primary valve body support member 2 and a secondary valve body support member 9 are further disposed in the hollow cavity, the primary valve body 4 is rotatably connected to the primary valve body support member 2, and the secondary valve body 6 is rotatably connected to the secondary valve body support member 9. In one embodiment, the overflow outlet 10 is provided at the end of the secondary valve body 6 (the end which is remote from the secondary fitting). In another embodiment, the overflow outlet 10 is provided at the end of the secondary valve body support 9, so that the movement stroke of the restriction 11 can be shortened and miniaturization of the signal generator can be facilitated.
As shown in fig. 1, the electronic cabin 12 is provided with a drain hole 18 capable of communicating with the overflow outlet 10, and slurry flowing out through the overflow outlet 10 flows into the outside of the electronic cabin 12 through the drain hole 18 and finally flows out through the slurry outlet 21. As a preferred embodiment of the present application, an included angle between the axial direction of the drain hole 18 and the mud flow direction outside the electronic bin 12 is an obtuse angle, so that the mud in the overflow part can conform to the overall flow direction of the mud and conveniently flows into the outside of the electronic bin 12, the turbulence level is reduced, the chaotic oscillation of the mud is reduced, the interaction force between the mud layer and the mud layer is reduced, and the flow of the mud is facilitated.
As shown in fig. 1, a balance plunger 13 is disposed in the electronic cabin 12, and the balance plunger 13 can balance the internal pressure of the electronic cabin 12 and the external pressure of the electronic cabin 12, so as to prevent the electronic cabin 12 from being damaged due to imbalance between the internal pressure and the external pressure.
The present application also discloses a method for transmitting pressure pulses in a fluid, the method comprising: providing a pulse signal generator comprising a housing 1, the housing 1 having: the cavity, and respectively with mud entry 20 and the mud export 21 of cavity intercommunication, be provided with in the cavity: the rotary valve comprises a primary valve body 4 and a secondary valve body 6 which are arranged in sequence along the flow direction of the slurry, and the primary valve body 4 and the secondary valve body 6 can rotate at different speeds to change the flow area of the slurry at the rotary valve; a primary rotor 5 for driving the primary valve body 4 to rotate, the primary rotor 5 being driven to rotate by the slurry; a secondary rotor 8 for driving the secondary valve body 6 in rotation, said secondary rotor 8 being driven in rotation by the mud; and a mud displacement regulating unit comprising an overflow channel 22 capable of diverting mud, said overflow channel 22 being provided to said rotary valve, said primary rotary member 5 and/or said secondary rotary member 8; the mud displacement adjustment unit further comprises an adjustment mechanism for adjusting the overflow of the overflow channel 22 so that the difference between the displacement of mud through the primary rotor 5 and the displacement of mud through the secondary rotor 8 is an adjustable variable, the primary and secondary valves being operable at an adjustable speed differential;
flowing mud through the pulse signal generator;
adjusting the overflow amount of the overflow channel 22 by the mud displacement adjustment unit to adjust the difference in mud displacement of the primary rotor 5 and the secondary rotor 8;
a pressure wave signal having an adjustable frequency is generated.
The method in this application utilizes above-mentioned signal generator to obtain frequency adjustable mud pressure wave signal, the signal generator is in obtaining the beneficial effect on the pressure wave signal also extends to this method, does not give unnecessary details here.
The application also discloses a drill collar, which comprises a shell, wherein the underground pulse signal generator is arranged in the shell.
The application also discloses drilling equipment, which comprises a drill string and a drill bit, and the equipment also comprises a drill collar for connecting the drill string and the drill bit, wherein the drill collar is the drill collar; and a control unit and a data acquisition unit for transmitting downhole data to the control unit are also arranged in the hollow cavity, and the data acquisition unit comprises a measurement-while-drilling instrument and/or a logging-while-drilling instrument 17. It should be noted that the measurement-while-drilling tool and/or the logging-while-drilling tool 17 includes, but is not limited to, a borehole attitude measurement unit, a resistivity module, a gamma module, and other measurement-while-drilling modules.
The control unit comprises a control module 16, a modulation module and a ground demodulation module, wherein the control module 16 is used for controlling the adjusting mechanism, and the modulation module is used for encoding and modulating the downhole data into mud pressure waves and transmitting the data to the ground demodulation module through the pulse signal generator.
As shown in fig. 1, a pressure-bearing sealed connector 15 is arranged in the electronic bin 12, the driving member 14 establishes communication with the control module 16 through the pressure-bearing sealed connector 15, and the control of the flow limiting member 11 is realized, so that the adjustment of the overflow amount is realized, and the adjustable signal frequency can be obtained, so as to meet the requirements of different underground data information acquisition amounts at different well depth positions in the drilling process.
Where not mentioned in this application, can be accomplished using or referencing existing technology.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A downhole pulse signal generator comprising a housing having: the cavity, and respectively with the mud entry and the mud export of cavity intercommunication, its characterized in that, be provided with in the cavity:
the rotary valve comprises a primary valve body and a secondary valve body which are sequentially arranged along the flowing direction of the slurry, and the primary valve body and the secondary valve body can be mutually matched to change the flow area of the slurry at the rotary valve;
a primary rotor for driving rotation of the primary valve body, the primary rotor being driven in rotation by the mud;
a secondary rotor for driving rotation of the secondary valve body, the secondary rotor being driven in rotation by the mud; and
the slurry discharge regulating unit comprises an overflow channel capable of distributing slurry, and the overflow channel is arranged on the primary valve body or the secondary valve body; the mud displacement regulating unit further comprises a regulating mechanism, the regulating mechanism is used for regulating the overflow quantity of the overflow channel, so that the difference value of the mud displacement flowing through the primary rotating member and the mud displacement flowing through the secondary rotating member is an adjustable variable, and the primary valve body and the secondary valve body can operate at an adjustable rotation speed difference.
2. The downhole pulse signal generator of claim 1,
the adjusting mechanism comprises a flow-limiting piece and a driving piece for driving the flow-limiting piece to move, the overflow channel is provided with an overflow outlet, and the flow-limiting piece is provided with a flow-limiting part capable of opening, closing or partially shielding the overflow outlet;
the overflow outlet is a variable cross-section through opening, and/or the flow limiting part is of a structure with a variable cross section, and the driving piece changes the overflow area at the overflow outlet by controlling the movement amount of the flow limiting piece so as to change the overflow amount of the overflow channel.
3. A downhole pulse signal generator according to claim 2,
the flow limiting piece is driven by the driving piece to do linear motion.
4. A downhole pulse signal generator according to claim 3,
the movement direction of the flow-limiting piece is parallel to the axial direction of the overflow outlet.
5. The downhole pulse signal generator of claim 1,
the secondary valve body is provided with a secondary matching part which is matched with the primary valve body to change the flow area of the mud at the rotary valve, and a secondary connecting part which is fixedly connected with the secondary matching part and is connected with the secondary rotary part, and the overflow channel is arranged on the secondary connecting part.
6. A downhole pulse signal generator according to claim 5,
the primary valve body is provided with a primary matching part which is matched with the secondary valve body to change the flow area of the slurry at the rotary valve, and a primary connecting part which is fixedly connected with the primary matching part and is connected with the primary rotating part, and the primary rotating part is sleeved on the outer side of the primary connecting part;
the secondary rotating part is sleeved on the outer side of the secondary connecting part.
7. The downhole pulse signal generator of claim 6,
the primary rotating part is in key connection with the primary valve body, and the secondary rotating part is in key connection with the secondary valve body.
8. A method for transmitting pressure pulses in a fluid, comprising:
providing a pulse signal generator comprising a housing having: the cavity, and respectively with mud entry and the mud export of cavity intercommunication, be provided with in the cavity: the rotary valve comprises a primary valve body and a secondary valve body which are sequentially arranged along the flowing direction of the slurry, and the primary valve body and the secondary valve body can rotate at different speeds to change the flow area of the slurry at the rotary valve; a primary rotor for driving rotation of the primary valve body, the primary rotor being driven in rotation by the mud; a secondary rotor for driving rotation of the secondary valve body, the secondary rotor being driven in rotation by the mud; the mud displacement adjusting unit comprises an overflow channel capable of dividing mud, and the overflow channel is arranged on the rotary valve, the primary rotary piece and/or the secondary rotary piece; the mud displacement regulating unit further comprises a regulating mechanism, the regulating mechanism is used for regulating the overflow quantity of the overflow channel so that the difference value of the mud displacement flowing through the primary rotating member and the mud displacement flowing through the secondary rotating member is an adjustable variable, and the primary valve and the secondary valve can operate at an adjustable speed difference;
flowing mud through the pulse signal generator;
adjusting the overflow amount of the overflow channel by the slurry discharge amount adjustment unit to adjust the difference in the slurry discharge amounts of the primary and secondary rotating members;
a pressure wave signal having an adjustable frequency is generated.
9. A drill collar comprises a shell and is characterized in that,
a downhole pulse signal generator according to any one of claims 1 to 7 is arranged in the housing.
10. Drilling apparatus comprising a drill string and a drill bit, wherein the apparatus further comprises a drill collar for connecting the drill string and the drill bit, the drill collar being as claimed in claim 9;
the hollow cavity is internally provided with a control unit and a data acquisition unit used for transmitting downhole data to the control unit, the data acquisition unit comprises a measurement while drilling instrument and/or a logging while drilling instrument, the control unit comprises a control module, a modulation module and a ground demodulation module, the control module is used for controlling the adjusting mechanism, and the modulation module is used for encoding and modulating the downhole data into mud pressure waves and transmitting the data to the ground demodulation module through the pulse generator.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399273.3A CN111577261B (en) | 2020-05-12 | 2020-05-12 | Underground pulse signal generator, pressure pulse transmission method, drill collar and drilling equipment |
| JP2021507519A JP7239678B2 (en) | 2020-05-12 | 2020-12-21 | drilling equipment |
| PCT/CN2020/137927 WO2021227501A1 (en) | 2020-05-12 | 2020-12-21 | Downhole pulse signal generator, method for transmitting pressure pulse, drill collar, and drilling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010399273.3A CN111577261B (en) | 2020-05-12 | 2020-05-12 | Underground pulse signal generator, pressure pulse transmission method, drill collar and drilling equipment |
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| CN111577261B CN111577261B (en) | 2020-11-20 |
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| WO2021227501A1 (en) * | 2020-05-12 | 2021-11-18 | 中国科学院地质与地球物理研究所 | Downhole pulse signal generator, method for transmitting pressure pulse, drill collar, and drilling device |
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| CN116378922A (en) * | 2023-05-31 | 2023-07-04 | 德阳市坤炜机电设备有限公司 | Drilling pumping system and monitoring method thereof |
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| CN115290284B (en) * | 2022-07-28 | 2024-05-28 | 中国石油天然气集团有限公司 | Experimental device and experimental method for high-transmission-rate continuous wave pulse generator |
| CN115075804A (en) * | 2022-08-16 | 2022-09-20 | 东营诺瑞克电池有限公司 | Pulse generator for simultaneous transmission at multiple single or multiple rates |
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| CN113982570A (en) * | 2021-10-13 | 2022-01-28 | 湖北弘华长技机电有限公司 | Shear valve pulse generating device |
| CN113982570B (en) * | 2021-10-13 | 2023-08-29 | 湖北弘华长技机电有限公司 | Shear valve pulse generating device |
| CN116378922A (en) * | 2023-05-31 | 2023-07-04 | 德阳市坤炜机电设备有限公司 | Drilling pumping system and monitoring method thereof |
| CN116378922B (en) * | 2023-05-31 | 2023-08-04 | 德阳市坤炜机电设备有限公司 | Drilling pumping system and monitoring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022527420A (en) | 2022-06-02 |
| WO2021227501A1 (en) | 2021-11-18 |
| CN111577261B (en) | 2020-11-20 |
| JP7239678B2 (en) | 2023-03-14 |
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