CN105680886A - Dual-frequency transmission tuning system and method suitable for electromagnetic wave resistivity measurement while drilling - Google Patents
Dual-frequency transmission tuning system and method suitable for electromagnetic wave resistivity measurement while drilling Download PDFInfo
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Abstract
The invention provides a dual-frequency transmission tuning system and method suitable for electromagnetic wave resistivity measurement while drilling. The dual-frequency transmission tuning system comprises an electromagnetic wave transmission circuit (1), a radio-frequency female joint (6), a radio-frequency male joint (7), a radio-frequency coaxial line (2), an impedance matcher (3) and a dual-frequency tuning network (4), wherein the dual-frequency tuning network (4) comprises a first frequency tuning channel (41) and a second frequency tuning channel (42) which are connected in parallel. The dual-frequency transmission tuning system and method have the advantages that the two frequency tuning channels are completely connected in parallel without sharing any electronic device, so that mutual influences between the frequency tuning channels during tuning of the two frequency tuning channels are lowered, and a tuning process is simplified. Furthermore, normal user of the other frequency tuning channel is not influenced even when one frequency tuning channel fails, so that the working reliability of the dual-frequency transmission tuning system is enhanced.
Description
Technical field
The present invention relates to a kind of oil field connector for logging while drilling, be specifically related to a kind of being suitable to boring the double frequency transmitting tuning system and method that electromagnetic resistivity is measured.
Background technology
At present, in oil drilling industry, the structure contrast etc. of the lithology differentiation of wellbore, oil reservoir and gas-bearing formation and the division of water layer, stratigraphic section it is mainly used as with brill electromagnetic wave resistivity logging. known with bore electromagnetic resistivity measure technology refer to: utilize the principle of mutual induction between basic electric field and magnetic field, transmitting coil motivates the alternating electric field of certain amplitude and bandwidth, this alternating electric field induces alternating magnetic field in stratum around, alternating magnetic field is inducing secondary alternating electric field again about, the like, finally in receiving coil, receive induction field, formation resistivity between size and phase angle to transmitting coil and the receiving coil of this induction field is relevant, measure size and the phase angle of this induction field, the resistivity of surrounding formation can be obtained.
For obtaining the formation resistivity of different depth, at present, many measure the front end of transmitting coil that instrument configures and double frequency is installed launches tuning system with boring electromagnetic resistivity, tuning system is launched by double frequency, electromagnetic resistivity radiating circuit can be made to launch the electromagnetic wave of two kinds of different frequencies, then, can the electromagnetic wave of two kinds of different frequencies be sent out timesharing by same transmitting coil. Wherein, wave frequency is typically between 200KHz to 5MHz to select, by the stratum that relatively low-frequency electromagnetic wave detection is farther, and by the nearer stratum of the electromagnetic wave detection of upper frequency.
Adopting, for most at present, the measurement instrument that can launch two kinds of different look-in frequencies, its double frequency is launched tuning system and is had the disadvantage in that
The 1st frequency tuning passage and the 2nd frequency tuning passage that double frequency transmitting tuning system configures share identical electronic device, therefore, between two resonant frequencies, there is obvious impact, improve the difficulty of on-the-spot tuning largely, for reaching all to realize tuning at two default Frequency points, repeatedly must switching between two Frequency points during practical operation, technique is relatively complicated.
Concrete, instrument is measured when underground work with boring electromagnetic resistivity, from earth's surface until the deep underground of thousands of rice, formation temperature has a greater change, statistical result showed: the distance earth's surface degree of depth often increases by 100 meters, formation temperature can increase about 3 DEG C, if well depth reaches 3000 meters, then the formation temperature of surrounding equipment is likely to be breached more than 100 DEG C, when electromagnetic wave resistivity instrument works in large-scale variations in temperature environment, reactive components in its double frequency tuning circuit can be acted upon by temperature changes, a degree of temperature drift can be there is in the major parameter of its individuality, this drift is the characteristic that electronics reactance component is intrinsic, the raw material used when manufacturing with it and technique have direct relation. two default operating frequencies are completed tuning by system at ambient temperature, and along with system enters stratum, in the process surrounded by hot environment gradually, it all can offset in the tuning of two frequencies that room temperature condition completes. as previously mentioned, both the tuning completed in room temperature environment two frequencies had been made, change along with environment formation temperature, influencing each other and can become apparent between these two frequencies, this can make the efficiency of emission current decline, thus affecting the electric field of receiving coil sensing, ultimately result in the deviation of measurement result.
In addition, electronic component down-hole high temperature, high pressure, strenuous vibration environmental work, it is also possible to bring uncertain physical damage, if certain element that double frequency is launched in tuning system is damaged, the tuning that can also result in two operating frequencies was lost efficacy, and then made whole electromagnetic resistivity measure instrument inefficacy.
Visible, existing double frequency launches tuning system, owing to the 1st frequency tuning passage and the 2nd frequency tuning passage share identical electronic device, therefore, when one of them frequency tuning passage breaks down and lost efficacy, usually also result in another frequency tuning channel failure, thus having the deficiency that Measurement reliability is relatively low.
Summary of the invention
For the defect that prior art exists, the present invention provides a kind of being suitable to boring the double frequency transmitting tuning system and method that electromagnetic resistivity is measured, can effectively solve the problems referred to above.
The technical solution used in the present invention is as follows:
The present invention provides a kind of and is suitable to boring the double frequency transmitting tuning system that electromagnetic resistivity is measured, including the electromagnetic radiation circuit (1) being sequentially connected in series, radio frequency female joint (6), radio frequency male joint (7), radio-frequency (RF) coaxial line (2), impedance matching box (3) and double frequency tuning network (4);
Wherein, described double frequency tuning network (4) includes the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) of parallel connection.
Preferably, described 1st frequency tuning passage (41) includes the 1st inductance (411) and the 1st electric capacity (412) of series connection;
Described 2nd frequency tuning passage (42) includes the 2nd inductance (421) and the 2nd electric capacity (422) of series connection.
Preferably, the resistance value of described radio frequency female joint (6), described radio frequency male joint (7) and described radio-frequency (RF) coaxial line (2) is 50 ohm.
The present invention also provides for a kind of being suitable to and, with boring the double frequency transmitting tuning methods that electromagnetic resistivity is measured, comprises the following steps:
S1, for boring electromagnetic resistivity measurement instrument, being configured with n transmitting coil altogether, n is natural number; The front end of each described transmitting coil is all connected with independent double frequency and launches tuning system;
Host computer is launched tuning system with double frequency each described and is connected;
S2, for arbitrary transmitting coil (5), after being connected with 1 described double frequency transmitting tuning system, described double frequency is launched tuning system and is controlled by host computer, making presetting the 1st frequency electromagnetic signal of described transmitting coil (5) time division emission and the 2nd frequency electromagnetic signal, concrete control method is:
S2.1, PC control electromagnetic radiation circuit (1) timesharing produces the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal;Wherein, the frequency of the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal differs;
S2.2, at current time, it is assumed that what electromagnetic radiation circuit (1) produced is the 1st frequency electromagnetic signal, then the 1st frequency electromagnetic signal is fed to impedance matching box (3) through radio-frequency (RF) coaxial line (2);
The impedance matching of the impedance matching of S2.3, the input of impedance matching box (3) and radio-frequency (RF) coaxial line (2), the outfan of impedance matching box (3) and double frequency tuning network (4); Therefore, after impedance matching box (3) acts on, the 1st frequency electromagnetic signal is transferred to double frequency tuning network (4);
S2.4, double frequency tuning network (4) has the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) of parallel connection, therefore, when the input of double frequency tuning network (4) receives the 1st frequency electromagnetic signal, 1st frequency electromagnetic signal automatic transport is to the 1st frequency tuning passage (41) mated with own frequency, then, by the 1st frequency tuning passage (41), 1st frequency electromagnetic signal is transported to transmitting coil (5), therefore, the 1st frequency electromagnetic signal is transferred to surrounding formation by transmitting coil (5);
S2.5, same, when electromagnetic radiation circuit (1) produce be the 2nd frequency electromagnetic signal time, the 2nd frequency electromagnetic signal feeds back to impedance matching box (3) after radio-frequency (RF) coaxial line (2); Then, the 2nd frequency electromagnetic signal is transferred to double frequency tuning network (4) by impedance matching box (3);
S2.6, when the input of double frequency tuning network (4) receives the 2nd frequency electromagnetic signal, 2nd frequency electromagnetic signal automatic transport is to the 2nd frequency tuning passage (42) mated with own frequency, then, by the 2nd frequency tuning passage (42), 2nd frequency electromagnetic signal is transported to transmitting coil (5), and therefore, the 2nd frequency electromagnetic signal is transferred to surrounding formation by transmitting coil (5).
Preferably, also include:
S3, use Network Analyzer that the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) are carried out independent tuning, by the 1st frequency tuning passage (41) be tuned to the state mated with the 1st frequency electromagnetic, by the 2nd frequency tuning passage (42) be tuned to the state mated with the 2nd frequency electromagnetic.
Preferably, S3 particularly as follows:
Radio frequency male joint (7) docking that Network Analyzer is connected with radio-frequency (RF) coaxial line (2), first the value of the 1st electric capacity (412) of the 1st frequency tuning passage (41) is changed, and the display of observation grid analyser, make the 1st frequency tuning passage (41) be tuned to be suitable to transmission the 1st frequency electromagnetic signal state;
Then, change the value of the 2nd electric capacity (422) of the 2nd frequency tuning passage (42) the display of observation grid analyser, make the 2nd frequency tuning passage (42) be tuned to be suitable to the state of transmission the 2nd frequency electromagnetic signal.
The double frequency transmitting tuning system and method be suitable to boring electromagnetic resistivity measurement provided by the invention has the advantage that
Double frequency tuning network provided by the invention, is made up of two completely self-contained frequency tuning passages in parallel; Owing to two frequency tuning passages are completely in parallel, do not share any electronic device, therefore, when decreasing two frequency tuning passages of tuning, influencing each other between each frequency tuning passage, that is: an operating frequency is only tuned by each frequency tuning passage, without affecting the tuning result of another frequency tuning passage, simplifies the process of tuning; Further, both made when a frequency tuning passage breaks down, without the normal use affecting another frequency tuning passage, thus improve double frequency to launch the functional reliability of tuning system.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that double frequency provided by the invention launches tuning system;
Fig. 2 is the simplification structural representation of double frequency tuning network provided by the invention;
Fig. 3 is the detailed construction schematic diagram of double frequency tuning network provided by the invention;
Fig. 4 is provided by the invention with the operation principle schematic diagram boring electromagnetic resistivity measuring instrument.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, the present invention provides a kind of in boring the double frequency transmitting tuning system that electromagnetic resistivity is measured, including the electromagnetic radiation circuit 1 being sequentially connected in series, radio frequency female joint 6, radio frequency male joint 7, radio-frequency (RF) coaxial line 2, impedance matching box 3 and double frequency tuning network 4;
As in figure 2 it is shown, double frequency tuning network 4 includes the 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 of parallel connection. Further, the 1st frequency tuning passage 41 includes the 1st inductance the 411 and the 1st electric capacity 412 of series connection; 2nd frequency tuning passage 42 includes the 2nd inductance the 421 and the 2nd electric capacity 422 of series connection.
As can be seen here, double frequency tuning network provided by the invention, it is made up of two completely self-contained frequency tuning passages in parallel; Owing to two frequency tuning passages are completely in parallel, do not share any electronic device, therefore, when decreasing two frequency tuning passages of tuning, influencing each other between each frequency tuning passage, that is: an operating frequency is only tuned by each frequency tuning passage, without affecting the tuning result of another frequency tuning passage, simplifies the process of tuning; Further, both made when a frequency tuning passage breaks down, without the normal use affecting another frequency tuning passage, thus improve double frequency to launch the functional reliability of tuning system.
Additionally, in practical application, the resistance value of radio frequency female joint 6, radio frequency male joint 7 and radio-frequency (RF) coaxial line 2 can be 50 ohm.
In practical application, as well known to those skilled in the art, when transmitting coil being received double frequency and launching tuning system, need to make transmitting coil be in a loop, the normal operation of guarantee transmitting coil, therefore, such as Fig. 3 institute method, for the detailed construction schematic diagram of double frequency tuning network.
Node 301 is the input of double frequency tuning network, for being connected to the outfan of the impedance matching box of Fig. 1; From the electromagnetic signal of certain frequency of impedance matching box output after the frequency-selecting of the 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42, being transferred to transmitting coil 5, electromagnetic signal is sent by transmitting coil 5 to stratum; The output node 308 of transmitting coil 5 is connected to the input of the impedance matching box of Fig. 1 simultaneously, and then forms circuit transmission loop.
If the total impedance of the 1st frequency tuning passage 41 is Z2, it may be assumed that it is the impedance sum of the 1st inductance the 411 and the 1st electric capacity 412; If the total impedance of the 2nd frequency tuning passage 42 is Z3, it may be assumed that it is the impedance sum of the 2nd inductance the 421 and the 2nd electric capacity 422.
Then: the total impedance Z after the 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 parallel connection1For:
1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 is independently tuned in one of two predeterminated frequencies, and during tuner operation, the tuning result of the two passage is independent mutually, it does not have impact.
In figure 3, the 3rd inductance 306 is the equivalent inductance of transmitting coil 5, and resistance 307 is the equiva lent impedance Z of whole double frequency tuning network307. The impedance of whole double frequency tuning network also includes equiva lent impedance Z307, transmitting coil 5 equiva lent impedance Z306, change the capacitance of the 1st electric capacity 412, it may be achieved the tuning to the adaptive predeterminated frequency of the 1st frequency tuning passage 41, now Z1The reaction component of complex impedance is zero;Change the capacitance of the 2nd electric capacity 422, it may be achieved the tuning to the adaptive predeterminated frequency of the 2nd frequency tuning passage 42, now Z1The reaction component of complex impedance is also zero.
The present invention also provides for a kind of being suitable to and, with boring the double frequency transmitting tuning methods that electromagnetic resistivity is measured, comprises the following steps:
S1, for boring electromagnetic resistivity measurement instrument, being configured with n transmitting coil altogether, n is natural number; The front end of each transmitting coil is all connected with independent double frequency and launches tuning system;
Host computer is launched tuning system with each double frequency and is connected;
S2, for arbitrary transmitting coil 5, after being connected with 1 double frequency transmitting tuning system, double frequency is launched tuning system and is controlled by host computer, making presetting the 1st frequency electromagnetic signal of transmitting coil 5 time division emission and the 2nd frequency electromagnetic signal, concrete control method is:
S2.1, PC control electromagnetic radiation circuit 1 timesharing produces the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal; Wherein, the frequency of the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal differs;
S2.2, at current time, it is assumed that what electromagnetic radiation circuit 1 produced is the 1st frequency electromagnetic signal, then the 1st frequency electromagnetic signal is fed to impedance matching box 3 through radio-frequency (RF) coaxial line 2;
The impedance matching of the impedance matching of S2.3, the input of impedance matching box 3 and radio-frequency (RF) coaxial line 2, the outfan of impedance matching box 3 and double frequency tuning network 4; Therefore, after impedance matching box 3 acts on, the 1st frequency electromagnetic signal is transferred to double frequency tuning network 4;
The purpose that arranges of impedance matching box is: reduce the reflection at signal source transmitting terminal, it is achieved best signal transmission.
S2.4, double frequency tuning network 4 has the 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 of parallel connection, therefore, when the input of double frequency tuning network 4 receives the 1st frequency electromagnetic signal, the 1st frequency electromagnetic signal automatic transport is to the 1st frequency tuning passage 41 mated with own frequency, then, by the 1st frequency tuning passage 41,1st frequency electromagnetic signal is transported to transmitting coil 5, and therefore, the 1st frequency electromagnetic signal is transferred to surrounding formation by transmitting coil 5;
S2.5, same, when electromagnetic radiation circuit 1 produce be the 2nd frequency electromagnetic signal time, the 2nd frequency electromagnetic signal feeds back to impedance matching box 3 after radio-frequency (RF) coaxial line 2; Then, the 2nd frequency electromagnetic signal is transferred to double frequency tuning network 4 by impedance matching box 3;
S2.6, when the input of double frequency tuning network 4 receives the 2nd frequency electromagnetic signal, 2nd frequency electromagnetic signal automatic transport is to the 2nd frequency tuning passage 42 mated with own frequency, then, by the 2nd frequency tuning passage 42,2nd frequency electromagnetic signal is transported to transmitting coil 5, and therefore, the 2nd frequency electromagnetic signal is transferred to surrounding formation by transmitting coil 5.
Also include:
S3, use Network Analyzer that the 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 is carried out independent tuning, by the 1st frequency tuning passage 41 be tuned to the state mated with the 1st frequency electromagnetic, by the 2nd frequency tuning passage 42 be tuned to the state mated with the 2nd frequency electromagnetic.
Below by way of concrete test example, verifying that double frequency provided by the invention launches tuning system, its 1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 is completely independent, and is independent of each other:
(1) test example 1
By this test example, introduce two frequency tuning passages independent tuning to two predeterminated frequencies.
The radio frequency male joint 7 that Network Analyzer is connected with radio-frequency (RF) coaxial line 2 is docked, first the value of the 1st electric capacity 412 of the 1st frequency tuning passage 41 in Fig. 3 is changed, and the display of observation grid analyser, make the 1st frequency tuning passage 41 be tuned to be suitable to the state of transmission the 1st frequency electromagnetic signal;
Then, change the value of the 2nd electric capacity 422 of the 2nd frequency tuning passage 42 display of observation grid analyser, make the 2nd frequency tuning passage 42 be tuned to be suitable to the state of transmission the 2nd frequency electromagnetic signal.
Wherein, the bandwidth of Network Analyzer is adjusted so that it is two default frequencies, the tuning result of observation display screen can be covered, show that the tuning result of above-mentioned two frequencies independently completed only there occurs minimum change, within the range of permission.
(2) test example 2
1st frequency tuning passage the 41 and the 2nd frequency tuning passage 42 is also individually implemented heating and cooling test by the present inventor, result shows: when the 1st frequency tuning passage 41 is implemented heating and cooling, the tuned frequency point that this passage is corresponding there occurs visual skew, and the tuned frequency point of the 2nd frequency tuning passage is held essentially constant; And when the 2nd frequency tuning passage is implemented heating and cooling, the tuned frequency point that this passage is corresponding there occurs visual skew, and the tuned frequency point of the 1st frequency tuning passage still can be held essentially constant. Thus verifying that double frequency provided by the invention launches tuning system, two frequency tuning passages are each independent, are independent of each other.
(3) test example 3
In figure 3, only installation the 1st frequency tuning passage, and each pass element of the 2nd frequency tuning passage is not installed, double frequency tuning network still can work on the tuned frequency of the 1st frequency tuning passage. Same, only installation the 2nd frequency tuning passage, and each pass element of the 1st frequency tuning passage is not installed, double frequency tuning network still can work on the tuned frequency of the 2nd frequency tuning passage.
Thus prove, for double frequency tuning network, both made when a frequency tuning passage breaks down, without the normal use affecting another frequency tuning passage, thus improve double frequency to launch the functional reliability of tuning system.
It is described below and double frequency provided by the invention transmitting tuning system is applied to the specific embodiment boring electromagnetic wave resistivity instrument:
As shown in Figure 4, for structural representation during with brill electromagnetic wave resistivity instrument underground work state, electromagnetic resistivity body 104 is positioned at the rear portion of MTR 103, MTR 103 drives drill bit 113 to creep into, well 102 internal diameter is more than the external diameter of electromagnetic resistivity body 104, and this gap is in order to returning pressure mud.
In the diagram, being provided with four transmitting coils and two receiving coils altogether, four transmitting coils are designated as respectively: the 1st transmitting coil the 105, the 2nd transmitting coil the 106, the 3rd transmitting coil the 109 and the 4th transmitting coil 110; Two receiving coils are designated as respectively: the 1st receiving coil the 107 and the 2nd receiving coil 108.
For each transmitting coil, it is mounted on double frequency provided by the invention and launches tuning system, for making each transmitting coil can launch the electromagnetic wave of two kinds of different frequencies, it is achieved the measurement to the formation resistivity of different depth. In the diagram, only drawing two double frequencies and launch tuning system, respectively the 1st double frequency is launched tuning system the 111 and the 2nd double frequency and is launched tuning system 112.
When electromagnetic resistivity body 104 works, each transmitting coil sinusoidal electromagnetic wave of two different frequencies that stratum 101 time division emission is preset towards periphery successively, each receiving coil then receives the transmitting signal through stratum 101 decay, owing to the stratum of different resistivity is different to the decay launching signal, resistivity instrument calculates intensity and the phase angle of the signal received by each receiving coil, and obtains the resistivity of surrounding formation 101 according to result of calculation.
In sum, the double frequency transmitting tuning system and method be suitable to boring electromagnetic resistivity measurement provided by the invention has the advantage that
(1) launch tuning system by double frequency, can independently tune two frequency tuning passages, thus simplifying tuning technique, improve working performance, reducing time cost.
(2) when double frequency launches the work of tuning system, when ambient temperature changes, when the element in certain independent tuning passage makes the tuning result of respective frequencies that skew occurs because being influenced by temperature, the tuning result of another passage is unaffected. Additionally, both made the measurements resistivity of certain the tuning passage under certain frequency occur, when the situation of deviation true value occurs, without the measurement result of the operating frequency involving another tuning passage, adding the reliability of system work.
(3) further, if because certain unknowable reason, such as reasons such as the high temperature of down-hole, high pressure or strenuous vibrations, cause the element failure of certain tuning passage, thus when affecting operating frequency cisco unity malfunction corresponding to this passage, it is also ensured that the frequency that another passage tunes still can work, without making whole electromagnetic wave resistivity instrument complete failure.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (6)
1. one kind is suitable to boring the double frequency transmitting tuning system that electromagnetic resistivity is measured, it is characterized in that, including the electromagnetic radiation circuit (1) being sequentially connected in series, radio frequency female joint (6), radio frequency male joint (7), radio-frequency (RF) coaxial line (2), impedance matching box (3) and double frequency tuning network (4);
Wherein, described double frequency tuning network (4) includes the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) of parallel connection.
2. the double frequency be suitable to boring electromagnetic resistivity measurement according to claim 1 launches tuning system, it is characterized in that, described 1st frequency tuning passage (41) includes the 1st inductance (411) and the 1st electric capacity (412) of series connection;
Described 2nd frequency tuning passage (42) includes the 2nd inductance (421) and the 2nd electric capacity (422) of series connection.
3. the double frequency be suitable to boring electromagnetic resistivity measurement according to claim 1 launches tuning system, it is characterized in that, the resistance value of described radio frequency female joint (6), described radio frequency male joint (7) and described radio-frequency (RF) coaxial line (2) is 50 ohm.
4. one kind is suitable to boring the double frequency transmitting tuning methods that electromagnetic resistivity is measured, it is characterised in that comprise the following steps:
S1, for boring electromagnetic resistivity measurement instrument, being configured with n transmitting coil altogether, n is natural number; The front end of each described transmitting coil is all connected with independent double frequency and launches tuning system;
Host computer is launched tuning system with double frequency each described and is connected;
S2, for arbitrary transmitting coil (5), after being connected with 1 described double frequency transmitting tuning system, described double frequency is launched tuning system and is controlled by host computer, making presetting the 1st frequency electromagnetic signal of described transmitting coil (5) time division emission and the 2nd frequency electromagnetic signal, concrete control method is:
S2.1, PC control electromagnetic radiation circuit (1) timesharing produces the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal; Wherein, the frequency of the 1st frequency electromagnetic signal and the 2nd frequency electromagnetic signal differs;
S2.2, at current time, it is assumed that what electromagnetic radiation circuit (1) produced is the 1st frequency electromagnetic signal, then the 1st frequency electromagnetic signal is fed to impedance matching box (3) through radio-frequency (RF) coaxial line (2);
The impedance matching of the impedance matching of S2.3, the input of impedance matching box (3) and radio-frequency (RF) coaxial line (2), the outfan of impedance matching box (3) and double frequency tuning network (4); Therefore, after impedance matching box (3) acts on, the 1st frequency electromagnetic signal is transferred to double frequency tuning network (4);
S2.4, double frequency tuning network (4) has the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) of parallel connection, therefore, when the input of double frequency tuning network (4) receives the 1st frequency electromagnetic signal, 1st frequency electromagnetic signal automatic transport is to the 1st frequency tuning passage (41) mated with own frequency, then, by the 1st frequency tuning passage (41), 1st frequency electromagnetic signal is transported to transmitting coil (5), therefore, the 1st frequency electromagnetic signal is transferred to surrounding formation by transmitting coil (5);
S2.5, same, when electromagnetic radiation circuit (1) produce be the 2nd frequency electromagnetic signal time, the 2nd frequency electromagnetic signal feeds back to impedance matching box (3) after radio-frequency (RF) coaxial line (2); Then, the 2nd frequency electromagnetic signal is transferred to double frequency tuning network (4) by impedance matching box (3);
S2.6, when the input of double frequency tuning network (4) receives the 2nd frequency electromagnetic signal, 2nd frequency electromagnetic signal automatic transport is to the 2nd frequency tuning passage (42) mated with own frequency, then, by the 2nd frequency tuning passage (42), 2nd frequency electromagnetic signal is transported to transmitting coil (5), and therefore, the 2nd frequency electromagnetic signal is transferred to surrounding formation by transmitting coil (5).
5. the double frequency be suitable to boring electromagnetic resistivity measurement according to claim 4 launches tuning methods, it is characterised in that also include:
S3, use Network Analyzer that the 1st frequency tuning passage (41) and the 2nd frequency tuning passage (42) are carried out independent tuning, by the 1st frequency tuning passage (41) be tuned to the state mated with the 1st frequency electromagnetic, by the 2nd frequency tuning passage (42) be tuned to the state mated with the 2nd frequency electromagnetic.
6. according to claim 5 be suitable to bore electromagnetic resistivity measure double frequency launch tuning methods, it is characterised in that S3 particularly as follows:
Radio frequency male joint (7) docking that Network Analyzer is connected with radio-frequency (RF) coaxial line (2), first the value of the 1st electric capacity (412) of the 1st frequency tuning passage (41) is changed, and the display of observation grid analyser, make the 1st frequency tuning passage (41) be tuned to be suitable to transmission the 1st frequency electromagnetic signal state;
Then, change the value of the 2nd electric capacity (422) of the 2nd frequency tuning passage (42) the display of observation grid analyser, make the 2nd frequency tuning passage (42) be tuned to be suitable to the state of transmission the 2nd frequency electromagnetic signal.
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| US11265036B2 (en) | 2017-11-13 | 2022-03-01 | Oneplus Technology (Shenzhen) Co., Ltd. | Self-tuning method, self-tuning system and mobile terminal |
| CN110085972A (en) * | 2019-05-06 | 2019-08-02 | 中国科学院地质与地球物理研究所 | A kind of antenna transmission circuit with brill orientation electromagnetic wave resistivity logging instrument |
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