CN115288666A - Nuclear magnetic logging while drilling instrument probe with separated transmitting and receiving coils - Google Patents
Nuclear magnetic logging while drilling instrument probe with separated transmitting and receiving coils Download PDFInfo
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- CN115288666A CN115288666A CN202210786695.5A CN202210786695A CN115288666A CN 115288666 A CN115288666 A CN 115288666A CN 202210786695 A CN202210786695 A CN 202210786695A CN 115288666 A CN115288666 A CN 115288666A
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- 239000000523 sample Substances 0.000 title claims abstract description 69
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 51
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 238000005481 NMR spectroscopy Methods 0.000 abstract description 33
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000002955 isolation Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 23
- 239000001257 hydrogen Substances 0.000 description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 22
- 230000005284 excitation Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005292 diamagnetic effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/092—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting magnetic anomalies
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- E—FIXED CONSTRUCTIONS
- 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
- E21B47/00—Survey of boreholes or wells
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention belongs to the technical field of nuclear magnetic resonance logging, and provides a transmitting and receiving coil separated nuclear magnetic logging while drilling instrument probe, which comprises: the device comprises a probe framework, a first permanent magnet, a second permanent magnet, a transmitting coil, a first receiving coil and a second receiving coil. The probe framework is in a long cylindrical shape, a slurry through hole is formed in the center of the probe framework, first and second permanent magnets are symmetrically arranged in the vertical position in a space area between the outer wall of the probe framework and the slurry through hole, and the magnetizing directions of the first and second annular permanent magnets are axially overlapped with those of the probe framework and the magnetizing polarities of the first and second annular permanent magnets are opposite; the transmitting coil is wound in the middle of the probe framework, the first receiving coil and the second receiving coil are symmetrically arranged between the transmitting coil and the first annular permanent magnet and between the transmitting coil and the second annular permanent magnet, the number of turns of the first receiving coil is the same, the polarities of the first receiving coil and the second receiving coil are opposite, and the first receiving coil and the second receiving coil are connected in series and output. The invention has the advantages of independent parameter design of the receiving and transmitting coil, no need of a receiving and transmitting multiplexing circuit with isolation and switching functions, simplified instrument design, improved reliability, improved signal-to-noise ratio and improved measurement precision.
Description
Technical Field
The invention belongs to the technical field of nuclear magnetic resonance logging, and particularly relates to a transmitting and receiving coil separated nuclear magnetic logging while drilling instrument probe.
Background
The nuclear magnetic resonance logging while drilling instrument measures the formation condition around the oil well by using the nuclear magnetic resonance principle, thereby detecting the relevant information of the hydrogen-containing fluid in the formation. Specifically, the nuclear magnetic resonance logging while drilling instrument forms a static magnetic field and an excitation field required for measurement through a probe, generates a nuclear magnetic resonance signal by exciting hydrogen-containing fluid around an oil well, receives and analyzes the nuclear magnetic resonance signal to obtain related parameters of hydrogen nuclei in a stratum, and further measures related information of the hydrogen-containing fluid in the stratum, such as volume percentage content of the hydrogen-containing fluid in the stratum, flow characteristics and electric conduction characteristics of the hydrogen-containing fluid and the like.
The structure design of the probe determines the range of a detection sensitive area, the measurement mode of the nuclear magnetic resonance logging instrument, the intensity of generated nuclear magnetic resonance signals, the original signal-to-noise ratio of the received nuclear magnetic resonance signals and other key performances.
The structure of a nuclear magnetic resonance logging while drilling instrument probe in the prior art is shown in fig. 1, the probe is in a long cylindrical shape and mainly comprises: the probe comprises a probe framework 10, two permanent magnets 13 and 14 which are symmetrically arranged up and down, and a coil 15 for transceiving multiplexing at the middle position. Wherein the probe skeleton 10 comprises a central mud through hole 11 and a probe shell 12; the two permanent magnets 13 and 14 which are symmetrically arranged up and down are arranged in a way that the magnetic poles are opposite, and the arrangement can form a relatively uniform static magnetic field B in the sensitive area M 0 . The coil 15 is used for transmitting and receiving, and the transmitting and receiving multiplex coil 15 in the transmitting state generates an alternating excitation field B under the drive of a transmitting circuit of the nuclear magnetic resonance logging instrument while drilling 1 Alternating excitation field B 1 Direction of (A) and static magnetic field B 0 Is vertical. The fluid in the sensitive region M contains hydrogen nuclei in the excitation field B 1 Absorbing energy into a high energy state under the action of the magnetic field. After the excitation is stopped, the transceiving multiplexing coil 15 is switched to a receiving state, and the nuclear magnetic resonance phenomenon is generated when hydrogen nuclei in the sensitive area are detected in the process of gradually recovering the thermal steady state from the high-energy state, wherein the nuclear magnetic resonance process is called a relaxation process, and the used time is called relaxation time. During this relaxation time, the magnetic resonance phenomenon of the hydrogen fluid in the sensing region M is detected to trigger the receive lineThe magnetic field around the coil changes periodically, so that an induced voltage signal, namely a nuclear magnetic resonance signal received by the receiving coil, is formed in the receiving coil. The kernel magnetic resonance signal output by the receiving coil in the relaxation time is weakened from strong to finally disappear.
The coil in the logging-while-drilling nuclear magnetic resonance logging instrument probe in the prior art is used for transmitting and receiving, so that the coil needs to simultaneously meet the constraints of transmitting and receiving circuits, such as the conditions of the coil wire diameter, the number of turns, the structure, the installation position and the like. As shown in fig. 1, due to these constraints, the coil 15 for transmit-receive multiplexing can only be installed at the center of the probe 10, and has a relatively large wire diameter and a relatively small number of turns, which results in a relatively small equivalent receiving area, a relatively poor interference rejection capability, and a relatively low signal-to-noise ratio of the measurement result when the multiplexing coil 15 is used as a receiving coil. In addition, the multiplexing coil 15 needs a transceiving multiplexing circuit for realizing high-voltage isolation and full-speed switching functions, and the transceiving multiplexing circuit increases the complexity of the nuclear magnetic resonance logging-while-drilling instrument and reduces the overall reliability of the nuclear magnetic resonance logging-while-drilling instrument.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a nuclear magnetic logging-while-drilling instrument probe with a separated transmitting coil and a separated receiving coil, which eliminates the common constraint on the coils in the transmitting and receiving multiplexing process of the prior art system, enables the transmitting coil to have thicker wire diameter and fewer turns and to be arranged in the center, enables the receiving coil to be composed of two coils with thinner wire diameter and more turns, is respectively arranged at the upper part and the lower part of the transmitting coil in the axial direction and symmetrically arranged, and the two coils have the same turns and output signals after reversed polarity is connected in series. The invention increases the equivalent receiving area of the receiving coil and improves the amplitude of the received signal; the symmetrical structure eliminates the influence of environmental interference and improves the signal-to-noise ratio; the receiving and transmitting multiplexing circuit is not needed, the system complexity is reduced, and the reliability is improved.
The present invention is achieved in such a way that,
a transceiver coil separated nuclear magnetic logging while drilling tool probe, the probe comprising: the probe comprises a probe framework, a first annular permanent magnet and a second annular permanent magnet which are arranged at two ends of the probe framework and are coaxial with the probe framework, a transmitting coil arranged in the middle of the probe framework, and a first receiving coil and a second receiving coil which are symmetrically arranged at the upper end and the lower end of the transmitting coil.
Further: the probe framework is in a long cylindrical shape, and a slurry through hole is formed in the center of the probe framework; a first annular permanent magnet and a second annular permanent magnet are symmetrically arranged in the space region between the outer wall of the probe framework and the slurry through hole in the up-down direction, and the first annular permanent magnet and the second annular permanent magnet are opposite to each other along one end of the probe framework, which is magnetized in the axial direction and has the same magnetizing polarity; first and second receiving coils are disposed between the transmitting coil and the first and second ring magnets, respectively.
Further, the method comprises the following steps: the first receiving coil and the second receiving coil have the same number of turns and opposite polarities, and are connected in series to output.
Further: the transmitting coil and the receiving coil are spirally wound on the probe framework by using a copper cable or a silver cable to form a spiral conductive cable.
Further: the cross section shape, the wire diameter and the number of turns of a conductive wire used for winding the transmitting coil and the receiving coil are respectively optimally designed according to the requirements of transmitting and receiving, wherein the wire diameter of the transmitting coil is larger than that of the receiving coil, and the number of turns of the transmitting coil is smaller than that of the receiving coil.
Further, the method comprises the following steps: the receiving coil is always directly connected with the receiving amplifying circuit in the whole measuring process.
Compared with the prior art, the invention has the beneficial effects that:
(1) The receiving and transmitting coils are separated, parameters such as wire diameter, turns, installation position and the like can be respectively designed according to the requirements of the transmitting coil and the receiving coil, so that the parameter design of the receiving and transmitting coils has independence, and the respective application effects are optimized. The transmitter coil is recommended to be a coil with a thick wire diameter and a small number of turns and to be installed in the center, and the receiver coil is recommended to be a coil with a thin wire diameter and a large number of turns and to be installed coaxially and symmetrically with the transmitter coil.
(2) Because the two receiving coils which have the same number of turns and are connected in series in the reversed polarity are positioned at the symmetrical positions above and below the transmitting coil, the induced electromotive forces generated by the two receiving coils are mutually cancelled in the process of generating the alternating excitation field by the transmitting coil, namely the receiving coils can not induce the transmitting signals in the transmitting process. Therefore, the receiving coil can be directly connected with the receiving amplifying circuit all the time in the whole measuring process, and a transceiving multiplexing circuit with the functions of isolation and switching is not needed. The elimination of the transmit-receive multiplexing circuit brings two benefits:
firstly, the whole circuit of the nuclear magnetic resonance logging while drilling instrument is simplified, the complexity of the system is reduced, and the reliability is improved;
secondly, the influence of the isolation switching process on the receiving circuit is eliminated, the detection speed is increased, and the signal quality is improved.
(3) The detection sensitive area is in a ring shape, is positioned outside the probe and is radially horizontal to the transmitting coil (note: the original is coplanar), and the center of the ring is superposed with the center of the probe. After excitation, the fluid in the sensitive area contains hydrogen nuclei to generate nuclear magnetic resonance phenomenon, namely, an alternating magnetic field is generated in the sensitive area. Because the axes of the two receiving coils are also overlapped with the axis of the probe and symmetrically distributed on the upper part and the lower part of the transmitting coil, the changing polarities of the alternating magnetic field generated by the magnetic resonance phenomenon in the two receiving coils are just opposite, namely the magnetic flux of the upper receiving coil is enhanced, the lower part is weakened, and vice versa. Because the two receiving coils adopt the reversed polarity series connection structure, the induced electromotive force generated by the alternating magnetic field of the sensitive area in the two receiving coils is superposed, namely the two receiving coils have the superposition enhancement effect on the nuclear magnetic resonance signals.
For far interference, the distances from the two coils to the interference source are basically the same, so that induced electromotive forces generated by the interference source in the two receiving coils are basically the same in magnitude but opposite in polarity, the induced electromotive forces are mutually cancelled in the receiving coils, no output signal is generated, namely the receiving coils with the same number of turns and the series reverse polarity have a cancellation effect on the far interference, and the beneficial effects of improving the signal-to-noise ratio and improving the measurement accuracy are achieved.
Drawings
FIG. 1 is a schematic structural diagram of a nuclear magnetic logging while drilling instrument probe in the prior art;
FIG. 2 is a schematic structural diagram of a transmitting-receiving coil separated nuclear magnetic resonance logging-while-drilling instrument probe;
FIG. 3 is a schematic diagram of the principle of receiving signals from a probe of a nuclear magnetic resonance logging while drilling tool with separate transceiver coils;
FIG. 4 is a schematic diagram of the anti-interference principle of a transmitting-receiving coil separated nuclear magnetic resonance logging-while-drilling instrument probe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The nuclear magnetic resonance logging-while-drilling instrument can be used in vertical wells, inclined wells and even horizontal wells. The attitude of the probe is different in different applications, and therefore, the "axial direction" of the probe does not necessarily mean the vertical direction; however, for convenience of illustration, the present embodiment is described by taking a vertical well as an example, that is, "axial direction" is set to be vertical in the following embodiments, but this is set only for convenience of illustration and does not limit the present invention.
The embodiment provides a nuclear magnetic resonance logging while drilling tool probe with separated transceiver coils, as shown in fig. 2, including: the long cylindrical probe framework 20 comprises a slurry through hole 21 and a probe shell 22, wherein the slurry through hole 21 is vertically centered, the probe shell 22 is coaxial with the slurry through hole 21, and a cylinder with the inner diameter being consistent with that of the slurry through hole 21 is sleeved in the probe shell 22 to realize a through hole structure; the first permanent magnet 23 and the second permanent magnet 24 are arranged in an up-down symmetrical mode, the first permanent magnet 23 and the second permanent magnet 24 are annular and are sleeved on the cylinder, the first permanent magnet 23 and the second permanent magnet 24 are identical in size, and magnetic poles of the first permanent magnet 23 and the second permanent magnet 24 are arranged oppositely, so that the upper permanent magnet and the lower permanent magnet (23 and 24) can form relatively uniform magnetic poles in the sensitive area MStatic magnetic field B 0 . A transmitting coil 25 is arranged in the middle of the probe and is driven by a transmitting circuit of the nuclear magnetic resonance logging-while-drilling instrument to generate a Larmor frequency (f) L ) Alternating excitation field B 1 Alternating excitation field B 1 Direction of (A) and static magnetic field B 0 Is vertical. The fluid in the sensitive area M contains hydrogen nuclei in the excitation field B 1 Will absorb energy and enter a high energy state. The receiving coil is composed of a first receiving coil 26 and a second receiving coil 27 which are symmetrically arranged at the upper part and the lower part of the transmitting coil and have the same number of turns and opposite polarities (opposite winding directions), the first receiving coil 26 and the second receiving coil 27 are coaxial with the transmitting coil, and the output of the receiving coil is the output of the first receiving coil 26 and the second receiving coil 27 which are connected in series. Because the transmitting coil 25 is positioned between the first receiving coil 26 and the second receiving coil 27, and the first receiving coil 26 and the second receiving coil 27 are symmetrically distributed above and below the transmitting coil 25, the alternating magnetic field B generated by the transmitting coil 25 under the drive of the transmitting circuit of the while-drilling nuclear magnetic resonance logging instrument 1 The magnetic flux changes generated in the first receiving coil 26 and the second receiving coil 27 are equal in magnitude and direction. Because the two receiving coils have the same number of turns and are connected in series in opposite polarities, in the process of transmitting signals by the transmitting coil 25, induced electromotive forces generated by magnetic flux changes in the two receiving coils are the same in magnitude and opposite in polarity, and the induced electromotive forces are just cancelled, namely, the receiving coils cannot induce the transmitting signals in the transmitting process.
Exciting nuclear magnetic resonance phenomena to generate an electromagnetic field of a specific frequency, i.e. the larmor frequency f L . Larmor frequency f L The calculation formula of (a) is as follows:
where gamma is the gyromagnetic ratio and, for hydrogen nuclei,
is a constant, and therefore the Larmor frequency of the hydrogen nucleiRate f L Static magnetic field intensity B from the position of hydrogen nuclei 0 Is determined.
The process of receiving the nuclear magnetic resonance signal by the logging while drilling nuclear magnetic logging instrument probe based on the separation of the transceiver coil is shown in fig. 3, and hydrogen nuclei excited in the sensitive area M absorb electromagnetic energy with specific frequency and enter a high energy state. The hydrogen nuclei in low energy state are the hydrogen nuclei in paramagnetic state, the hydrogen nuclei in high energy state are the hydrogen nuclei in diamagnetic state, and the magnetic poles of the hydrogen nuclei in paramagnetic state and the static magnetic field B 0 Hydrogen nuclear magnetic pole in the same direction and reverse magnetic state and static magnetic field B 0 And reversing. The excitation process is a process for generating high-energy-state hydrogen nuclei from a macroscopic level, and a static magnetic field B is formed due to the high-energy-state hydrogen nuclei 0 Reverse magnetic field B 2 ，B 2 The relaxation time is regularly swung up and down according to a specific frequency and gradually changed in a damping way. This up-down swing and gradual damping change includes two aspects, one of which is B 2 Gradually decreases to zero in intensity, and B 2 Is directed to and B 0 The included angle of the swing arm changes up and down according to a certain frequency, and a curve G in FIG. 3 reflects the process of the swing up and down and the gradual attenuation, and the process is also called 'precession'. Due to B 2 The polarity of the magnetic flux changes induced in the two receiving coils (26, 27) is exactly opposite, i.e. the magnetic flux of one receiving coil increases and the magnetic flux of the other decreases, and vice versa. Because the two receiving coils (26, 27) adopt a reverse polarity series connection structure, B 2 The induced electromotive forces generated in the two receiving coils (26, 27) are superposed, that is, the voltage output by the receiving coils is the sum and superposition of the induced electromotive forces of the two coils connected in series.
The anti-interference principle of the far end of the transmitting-receiving coil separated logging-while-drilling nuclear magnetic logging instrument probe is shown in fig. 4, and an alternating interference magnetic field generated by an interference source at a longer distance (generally not less than several meters) is set as B 3 ，B 3 The polarity of the magnetic flux changes induced in the two receiving coils (26, 27) is the same. Because the length of the nuclear magnetic logging while drilling instrument probe with the separated transmitting and receiving coils is about 1 meter, the distance between the two receiving coils (26 and 27) is very closeTypically on the order of decimeters), therefore B 3 The distances to the receiving coils (26, 27) are substantially the same, so it can be considered that B 3 The magnitude of the magnetic flux variations induced in the two receiving coils (26, 27) is substantially the same. Since the receiving coils (26, 27) are connected in series with reversed polarity, B 3 The induced electromotive forces generated in the two receiving coils are basically the same in magnitude and opposite in direction, and the outputs after being connected in series are basically cancelled out.
The nuclear magnetic logging while drilling instrument probe with the separated transmitting and receiving coils realizes the separation of the transmitting and receiving coils, and parameters such as the wire diameter, the number of turns, the installation position and the like can be respectively designed according to the requirements of the transmitting coil and the receiving coil in engineering, so that the respective application effect is optimized; the receiving coils with the same number of turns and in series connection in reverse polarity are positioned at the axial symmetrical positions of the transmitting coils, and the receiving coils cannot sense transmitting signals in the transmitting process, so that the receiving coils can be directly connected with the receiving amplifying circuit all the time in the whole measuring process, a receiving and transmitting multiplexing circuit with the isolating and switching functions is not needed, the circuit of the whole drilling-following nuclear magnetic resonance logging instrument is simplified, the complexity of the system is reduced, the reliability is improved, the influence of the isolating and switching process on the receiving circuits is eliminated, the detection speed is improved, and the signal quality is improved; because the two receiving coils adopt a reversed polarity series connection structure, electromotive forces induced by an alternating magnetic field generated by the nuclear magnetic resonance phenomenon of the sensitive area in the two receiving coils are superposed, and the receiving effect of nuclear magnetic resonance signals is enhanced; the two receiving coils which have the same number of turns and are connected in series in reverse polarity have a cancellation effect on far interference, and can improve the signal-to-noise ratio and improve the measurement accuracy.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. A split transceiver coil nuclear magnetic logging while drilling tool probe, the probe comprising: the probe comprises a probe framework, a first annular permanent magnet and a second annular permanent magnet which are arranged at two ends of the probe framework and are coaxial with the probe framework, a transmitting coil arranged in the middle of the probe framework, and a first receiving coil and a second receiving coil which are symmetrically arranged at the upper end and the lower end of the transmitting coil.
2. The nuclear magnetic logging while drilling instrument probe with separated transceiver coils of claim 1, wherein: the probe framework is in a long cylindrical shape, and a slurry through hole is formed in the center of the probe framework; a first annular permanent magnet and a second annular permanent magnet are symmetrically arranged in the space region between the outer wall of the probe framework and the slurry through hole in the up-down direction, and the first annular permanent magnet and the second annular permanent magnet are opposite to each other along one end of the probe framework, which is magnetized in the axial direction and has the same magnetizing polarity; first and second receiving coils are disposed between the transmitting coil and the first and second ring magnets, respectively.
3. The NMR logging while drilling tool probe with separated transceiver coils as recited in claim 1, wherein the first and second receiving coils have the same number of turns and opposite polarities, and are connected in series to output.
4. The nuclear magnetic logging while drilling instrument probe with separated transceiver coils of claim 1, wherein: the transmitting coil and the receiving coil are spirally wound on the probe framework by using a copper cable or a silver cable to form a spiral conductive cable.
5. The nuclear magnetic logging while drilling instrument probe with separated transceiver coils of claim 4, wherein: the cross section shape, the wire diameter and the number of turns of a conductive wire used for winding the transmitting coil and the receiving coil are respectively optimally designed according to the requirements of transmitting and receiving, wherein the wire diameter of the transmitting coil is larger than that of the receiving coil, and the number of turns of the transmitting coil is smaller than that of the receiving coil.
6. The nuclear magnetic logging while drilling instrument probe with separated transceiver coils of claim 1, wherein: the receiving coil is always directly connected with the receiving amplifying circuit in the whole measuring process.
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| CN202210786695.5A CN115288666A (en) | 2022-07-04 | 2022-07-04 | Nuclear magnetic logging while drilling instrument probe with separated transmitting and receiving coils |
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| CN111796331A (en) * | 2020-08-24 | 2020-10-20 | 吉林大学 | Ground magnetic resonance detection device and method for shallow groundwater and hydrocarbon substances |
| CN112922584A (en) * | 2021-01-21 | 2021-06-08 | 中海油田服务股份有限公司 | Adjacent well detection device, method and system |
| CN113216948A (en) * | 2021-05-19 | 2021-08-06 | 中国石油大学(北京) | Multi-coil-structure while-drilling nuclear magnetic resonance logging device and method |
| CN113655533A (en) * | 2021-08-13 | 2021-11-16 | 核工业二0三研究所 | Sandstone-type uranium ore drilling transient electromagnetic logging device and logging method thereof |
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