CN115288667A - Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation - Google Patents
Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation Download PDFInfo
- Publication number
- CN115288667A CN115288667A CN202210787816.8A CN202210787816A CN115288667A CN 115288667 A CN115288667 A CN 115288667A CN 202210787816 A CN202210787816 A CN 202210787816A CN 115288667 A CN115288667 A CN 115288667A
- Authority
- CN
- China
- Prior art keywords
- probe
- permanent magnet
- compensation
- coil
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000523 sample Substances 0.000 title claims abstract description 72
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 70
- 230000003068 static effect Effects 0.000 title claims abstract description 41
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000005481 NMR spectroscopy Methods 0.000 abstract description 37
- 238000012545 processing Methods 0.000 abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 22
- 229910052739 hydrogen Inorganic materials 0.000 description 22
- 239000001257 hydrogen Substances 0.000 description 22
- 230000005284 excitation Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 8
- 230000032683 aging Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005292 diamagnetic effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention belongs to the technical field of nuclear magnetic resonance logging, and particularly relates to a nuclear magnetic logging instrument while drilling probe with static magnetic field compensation, which comprises a probe framework, wherein the probe framework is in a long cylindrical shape, and a slurry through hole is formed in the central shaft of the probe framework; a first permanent magnet and a second permanent magnet are symmetrically arranged at the upper and lower positions in a space region between the outer wall of the probe framework and the slurry through hole, the magnetizing directions of the first permanent magnet and the second permanent magnet are coincident with the axial direction of the probe framework, and the magnetizing polarities are opposite; a first compensation coil and a second compensation coil are respectively and symmetrically arranged at the vertically symmetrical positions of the probe and at the positions corresponding to the first permanent magnet and the second permanent magnet; and a transmitting and receiving coil is arranged in the middle of the probe framework. The nuclear magnetic resonance logging-while-drilling instrument probe reduces the consistency of processing the permanent magnet, improves the stability of a static magnetic field of the probe and simplifies a harmonic circuit of the probe.
Description
Technical Field
The invention belongs to the technical field of nuclear magnetic resonance logging, and particularly relates to a nuclear magnetic logging while drilling instrument probe with static magnetic field compensation.
Background
The nuclear magnetic resonance logging while drilling instrument is an effective tool for measuring relevant information of hydrogen-containing fluid in formations around an oil well by using the nuclear magnetic resonance principle. Specifically, the nuclear magnetic resonance logging while drilling instrument forms a static magnetic field and an excitation field required by measurement through a probe, obtains relevant parameters of hydrogen nuclei in a formation by exciting a nuclear magnetic resonance phenomenon of hydrogen-containing fluid around an oil well and then receiving and analyzing nuclear magnetic resonance signals released in the nuclear magnetic resonance process, and further obtains relevant information of the hydrogen-containing fluid in the formation, such as volume percentage content of the hydrogen-containing fluid in the formation, flow characteristics and electric conduction characteristics of the hydrogen-containing fluid.
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, two permanent magnets which are symmetrically arranged up and down and a transmitting-receiving multiplexing coil at the middle position. The probe framework comprises a mud through hole 11 and a probe shell 12 which are arranged at a central shaft; the two permanent magnets 13 and 14 are arranged symmetrically up and down, the magnetic poles are arranged oppositely, a uniform static magnetic field B0 is formed in the sensitive area M due to the arrangement, the coil 15 is used for transmitting and receiving multiplexing, the transmitting and receiving multiplexing coil 15 in a transmitting state generates an alternating excitation field B1 under the driving of a transmitting circuit of the logging while drilling nuclear magnetic resonance logging instrument, and the direction of the alternating excitation field B1 is perpendicular to the direction of the static magnetic field B0. The hydrogen nuclei contained in the fluid in the sensitive region M absorb energy into a high energy state under the action of the excitation field B1. After excitation is stopped, the transmitting-receiving multiplexing coil is switched to a receiving state, and nuclear magnetic resonance phenomenon is generated in the process that hydrogen nuclei in the sensitive area M are gradually restored to a thermal steady state from a high-energy state, wherein the process of the nuclear magnetic resonance 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 sensitive region M is detected to cause a periodic change in the magnetic field around the receiver coil, thereby forming an induced voltage signal in the receiver coil, i.e., a nuclear magnetic resonance signal received by the receiver coil. The nuclear magnetic resonance signal output by the receiving coil is fixed in frequency within the relaxation time, and the intensity is reduced from large to small.
Exciting an electromagnetic field of a specific frequency of the nuclear magnetic resonance phenomenon, this frequency being the larmor frequency fL, which is calculated as follows:
wherein gamma is gyromagnetic ratio, for hydrogen nuclei
Is a constant, and therefore, the larmor frequency of the hydrogen nuclei is determined by the magnitude of the static magnetic field intensity B0 at the position where the hydrogen nuclei are present.
Two permanent magnets which are symmetrically arranged up and down on a probe of the nuclear magnetic resonance logging-while-drilling instrument in the prior art are used for forming a static magnetic field B0 in a detection sensitive area. In practice, for the manufacture of permanent magnets, even if expensive high-temperature-resistant samarium cobalt materials are used, the consistency of a plurality of probes and the stability of B0 are still difficult to ensure. The main reason for this is that there are several engineering problems: (1) aging problems, i.e., demagnetization problems; (2) The temperature drift problem, namely the problem that the magnetic field intensity changes along with the temperature; and (3) solving the problem of product consistency. In addition, based on the prior art, the nuclear magnetic resonance logging-while-drilling instrument needs to design an adjustable probe tuning circuit to adapt to detection under different B0 conditions, so that the adjustable probe tuning circuit increases the complexity of the nuclear magnetic resonance logging-while-drilling instrument, and the overall reliability of the nuclear magnetic resonance logging-while-drilling instrument is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nuclear magnetic resonance logging-while-drilling instrument probe with static magnetic field compensation. The problem of consistency of permanent magnet processing is solved; the stability of instrument parameters and the environmental adaptability are improved; the resonance circuit of the probe is simplified, the complexity of the system is reduced, and the overall reliability of the nuclear magnetic resonance logging while drilling instrument is improved.
The present invention has been accomplished in such a manner that,
a nuclear magnetic logging while drilling instrument probe with static magnetic field compensation, comprising: the probe framework is in a long cylindrical shape, and a slurry through hole is formed in the central shaft of the probe framework; a first permanent magnet and a second permanent magnet are symmetrically arranged at the upper and lower positions in a space region between the outer wall of the probe framework and the slurry through hole, the magnetizing directions of the first permanent magnet and the second permanent magnet are coincident with the axial direction of the probe framework, and the magnetizing polarities are opposite; a first compensation coil and a second compensation coil are respectively and symmetrically arranged at the vertically symmetrical positions of the probe and at the positions corresponding to the first permanent magnet and the second permanent magnet; and a transmitting-receiving coil is arranged in the middle of the probe framework.
Further, the N poles of the first permanent magnet and the second permanent magnet are opposite.
Further, the first compensation coil and the second compensation coil are arranged at the outer side, the inner side, the top, the bottom or other nearby positions capable of accommodating the compensation coils.
Further, the first compensation coil and the second compensation coil are symmetrical in position, the number of turns is the same, and the polarities are opposite.
Further, the first compensation coil and the second compensation coil are connected in parallel or in series and are driven together by a compensation current.
Furthermore, the transmitting and receiving coil is a transmitting and receiving multiplexing coil or a separate transmitting coil and receiving coil.
Compared with the prior art, the invention has the beneficial effects that:
the invention generates extra magnetic field by leading current into the compensating coil to be superposed on the static magnetic field formed by the permanent magnet, so that the static magnetic field of the detection sensitive area does not change along with factors such as time, temperature, consistency and the like. The following effects are achieved:
(1) The consistency requirement on the processing of the permanent magnet is reduced: the processing of the permanent magnet involves a plurality of process steps such as batching, smelting, pulverizing, profiling, sintering, grinding, magnetizing, aging and the like, so that the consistency of the permanent magnet when leaving a factory is difficult to achieve a high level. In addition, the vertical positions of the probe of the nuclear magnetic resonance logging while drilling instrument are symmetrically provided with the first permanent magnet and the second permanent magnet, the first permanent magnet and the second permanent magnet are usually formed by bonding a plurality of small permanent magnets, the consistency of a finished product is difficult to evaluate before the assembly is finished, and once the bonding is finished, the adjustment is difficult to carry out. The invention provides a nuclear magnetic resonance logging while drilling instrument probe with static magnetic field compensation, wherein two coils for compensation are respectively arranged near two permanent magnets which are symmetrically distributed, and the problem of poor consistency of the permanent magnets can be effectively solved by introducing current into the compensation coils to generate a compensation magnetic field.
(2) The stability problem of the static magnetic field of the probe is improved: the static magnetic field of the assembled probe is not changed, and the main problems are the aging and the temperature drift of the permanent magnet. Aging is the irreversible decrease of the static magnetic field, and temperature drift is the regular change of the static magnetic field with temperature, and is reversible. These changes are regular and measurable, so that a compensation current can be generated according to the regular and measured data, and the stability of the static magnetic field of the probe is improved by generating a compensation magnetic field through a compensation coil.
(3) The tuning circuit of the probe is simplified: in the prior art, the transmitting and receiving of the nuclear magnetic resonance logging while drilling instrument generally adopt an LC parallel resonance mode, wherein L is the inductance of a probe transmitting and receiving coil and is a constant, so that the value of a resonance capacitor C needs to be adjusted by changing the resonance frequency, and a probe matching circuit with the characteristic of adjustable capacitance is needed in order to adapt to a changed static magnetic field B0. The probe tuning circuit with the adjustable capacitance characteristic generally comprises a group of high-voltage-resistant capacitors, a plurality of high-voltage-resistant relays and related control and driving circuits. The invention improves the stability of B0 through the compensation magnetic field, thereby adopting a fixed harmonic capacitor and greatly simplifying the complexity of a harmonic circuit.
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 diagram of a nuclear magnetic resonance logging while drilling tool probe with static magnetic field compensation;
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 static magnetic field compensation.
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 are not intended to limit the invention.
The logging-while-drilling nuclear magnetic resonance logging instrument can be used in vertical wells, inclined wells and even horizontal wells. The attitude of the probe is not the same in different applications, and therefore the "axial" of the probe is not necessarily vertical; for convenience of explanation, however, in the present embodiment, the vertical well is taken as an example, that is, the "axial direction" is vertical in the following embodiments, but the present invention is set forth only for convenience of the embodiment and is not limited thereto.
The embodiment provides a nuclear magnetic resonance logging while drilling tool probe with static magnetic field compensation, as shown in fig. 2, comprising: a probe skeleton, wherein the probe skeleton comprises a centered mud through hole 21 and a probe shell 22; the first permanent magnet 23 and the second permanent magnet 24 are arranged up and down symmetrically, wherein the magnetic poles of the first permanent magnet 23 and the second permanent magnet 24 are arranged oppositely. Two compensation coils are symmetrically arranged at the up-down symmetrical positions of the probe and at the positions near the two permanent magnets respectively: a first compensation coil 26 and a second compensation coil 27, the position of which can be outside, inside, top, bottom or other nearby positions that can accommodate the compensation coil. A transmitting and receiving coil 25 is arranged in the middle of the probe framework, wherein the transmitting and receiving coil can be a transmitting and receiving multiplexing coil or a separate transmitting coil and a separate receiving coil.
The principle of static magnetic field compensation is explained with reference to fig. 2: the first permanent magnet 23 and the second permanent magnet 24 are arranged up and down symmetrically, wherein the magnetic poles of the first permanent magnet 23 and the second permanent magnet 24 are arranged oppositely, so that the upper permanent magnet 23 and the lower permanent magnet 24 can form a uniform static magnetic field B00 in the sensitive region M. However, B00 is difficult to stabilize at the design value due to factors such as process uniformity, aging, and temperature drift, and the present invention adds two compensation coils near the first permanent magnet 23 and the second permanent magnet 24: a compensation coil 26 and a compensation coil 27. The axes of the compensation coil are superposed with the axes of the probe and the permanent magnet, so that the axes of the magnetic fields B01 and B00 generated after the compensation current passes through are superposed, the magnitude of the magnetic fields is in direct proportion to the passing current, and the pointing direction of the B01 is determined by the direction of the passing current. In the actual detection process, the magnitude and the direction of the compensation current are respectively set according to the initial value, the aging absorption and the temperature characteristic curve of the first permanent magnet and the second permanent magnet of the probe. The compensation current is respectively led into the compensation coil 26 and the compensation coil 27 to generate a compensation magnetic field B02, and the B02 and the B01 are superposed in the sensitive area M to form a static magnetic field B00. B00 is the static magnetic field after compensation, and compared with the technology of generating the static magnetic field by only depending on a permanent magnet, the B00 has better consistency and stability.
As can be seen from fig. 2, the first compensation coil 26 and the second compensation coil 27 depicted in fig. 2 have the characteristics of symmetrical positions, the same number of turns, and opposite polarities (opposite winding directions). The design of this embodiment has potential advantages: for example, under the condition of better initial consistency of the upper permanent magnet and the lower permanent magnet, two compensation coils can be connected in parallel or in series and are driven by one compensation current together, so that the number of system circuits is reduced, and the purposes of reducing the volume of an instrument, reducing the cost and the like are achieved. The embodiment shown in fig. 2 is an embodiment according to the teaching of the present invention and forms a limitation of the present invention.
The excitation principle of the logging tool probe with static magnetic field compensation while drilling is explained by combining with the figure 2: and the transmitting-receiving multiplexing coil 25 positioned in the middle of the probe generates an alternating excitation field B1 with Larmor frequency fL under the drive of a transmitting circuit of the MWD nuclear magnetic resonance logging instrument, and the direction of the alternating excitation field B1 is vertical to the direction of the compensated static magnetic field B00. The fluid in the sensitive region M contains hydrogen nuclei which can absorb energy into a high energy state under the action of the excitation field B1. The hydrogen nuclei in the low energy state are hydrogen nuclei in the paramagnetic state, the hydrogen nuclei in the high energy state are hydrogen nuclei in the diamagnetic state, the magnetic poles of the hydrogen nuclei in the paramagnetic state are in the same direction as the static magnetic field B00, and the magnetic poles of the hydrogen nuclei in the diamagnetic state are in the opposite direction to the static magnetic field B00. On a macroscopic level, the excitation process is a process for generating hydrogen nuclei in high energy states.
The receiving process of the logging-while-drilling nuclear magnetic resonance logger probe with static magnetic field compensation is shown in fig. 3, after excitation is stopped, the transceiver coil 25 is switched to a receiving state, hydrogen nuclei in the detection sensitive area M gradually recover from a high-energy state to a thermal steady state, energy is released to generate a nuclear magnetic resonance phenomenon, the nuclear magnetic resonance phenomenon lasts for a period of time, and the period of time is called relaxation time. On a macroscopic level, a magnetic field B2 opposite to the static magnetic field B00 is formed by the hydrogen nuclei in the high energy state generated in the excitation process, the B2 regularly swings up and down and gradually attenuates within the relaxation time according to the larmor frequency, the attenuation process is also called "precession", and the locus of the fixed point B2 is shown as a curve S in fig. 3. The precession of B2 causes a magnetic flux change in the transceiver coil 35, thereby generating an induced electromotive force, which is a nuclear magnetic resonance signal received by the transceiver multiplexing coil.
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 nuclear magnetic logging while drilling instrument probe with static magnetic field compensation is characterized by comprising: the probe framework is in a long cylindrical shape, and a slurry through hole is formed in the central shaft of the probe framework; a first permanent magnet and a second permanent magnet are symmetrically arranged at the upper and lower positions in a space region between the outer wall of the probe framework and the slurry through hole, the magnetizing directions of the first permanent magnet and the second permanent magnet are coincident with the axial direction of the probe framework, and the magnetizing polarities are opposite; a first compensation coil and a second compensation coil are respectively and symmetrically arranged at the vertically symmetrical positions of the probe and at the positions corresponding to the first permanent magnet and the second permanent magnet; and a transmitting and receiving coil is arranged in the middle of the probe framework.
2. The nuclear magnetic logging while drilling tool probe with static magnetic field compensation as claimed in claim 1, wherein the first permanent magnet and the second permanent magnet have N poles opposite to each other.
3. A nuclear magnetic logging while drilling tool probe with static magnetic field compensation as claimed in claim 1, wherein the first and second bucking coils are positioned outside, inside, on top of, on bottom of or near the permanent magnet to receive the bucking coils.
4. The nuclear magnetic logging while drilling tool probe with static magnetic field compensation of claim 3, wherein the first compensation coil and the second compensation coil are symmetrical in position, the same in number of turns, and opposite in polarity.
5. The nuclear magnetic logging while drilling instrument probe with static magnetic field compensation of claim 1, wherein when the consistency of the first permanent magnet and the second permanent magnet meets the requirement, the first compensation coil and the second compensation coil are connected in parallel or in series and are driven together by a compensation current.
6. The nuclear magnetic logging while drilling instrument probe with static magnetic field compensation as claimed in claim 1, wherein the transceiver coil is a transmit-receive multiplexing coil or a separate transmitter coil and receiver coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210787816.8A CN115288667A (en) | 2022-07-04 | 2022-07-04 | Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210787816.8A CN115288667A (en) | 2022-07-04 | 2022-07-04 | Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115288667A true CN115288667A (en) | 2022-11-04 |
Family
ID=83821490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210787816.8A Pending CN115288667A (en) | 2022-07-04 | 2022-07-04 | Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115288667A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050030021A1 (en) * | 2003-05-02 | 2005-02-10 | Prammer Manfred G. | Systems and methods for NMR logging |
| CN110058320A (en) * | 2019-04-28 | 2019-07-26 | 吉林大学 | A kind of adjustable active field nuclear magnetic resonance log probe of detecting area and its detection method |
| CN110199087A (en) * | 2017-03-09 | 2019-09-03 | 哈利伯顿能源服务公司 | With the downhole NMR tool to the dynamic Active Compensation answered that comes into force |
| 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 |
-
2022
- 2022-07-04 CN CN202210787816.8A patent/CN115288667A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050030021A1 (en) * | 2003-05-02 | 2005-02-10 | Prammer Manfred G. | Systems and methods for NMR logging |
| CN110199087A (en) * | 2017-03-09 | 2019-09-03 | 哈利伯顿能源服务公司 | With the downhole NMR tool to the dynamic Active Compensation answered that comes into force |
| CN110058320A (en) * | 2019-04-28 | 2019-07-26 | 吉林大学 | A kind of adjustable active field nuclear magnetic resonance log probe of detecting area and its detection method |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4350955A (en) | Magnetic resonance apparatus | |
| Jackson et al. | Remote (inside-out) NMR. III. Detection of nuclear magnetic resonance in a remotely produced region of homogeneous magnetic field | |
| US4717876A (en) | NMR magnet system for well logging | |
| US5712566A (en) | Nuclear magnetic resonance apparatus and method | |
| EP1642156B1 (en) | Systems and methods for nmr logging | |
| US9201159B2 (en) | Nuclear magnetic resonance logging tool having an array of antennas | |
| AU672674B2 (en) | Nuclear magnetic resonance measuring apparatus | |
| CA2285856C (en) | Apparatus and method for obtaining a nuclear magnetic resonance measurement while drilling | |
| US6018243A (en) | NMR well logging apparatus and method | |
| US6121773A (en) | Longitudinal NMR well logging apparatus and method | |
| NL1013480C2 (en) | Apparatus and method for generating a pulse sequence. | |
| AU735770B2 (en) | Apparatus and method for computing a distribution of spin-spin relaxation times | |
| US5959453A (en) | Radial NMR well logging apparatus and method | |
| CN101680936A (en) | Method and apparatus for high signal-to-noise ratio NMR well logging | |
| CN110058320A (en) | A kind of adjustable active field nuclear magnetic resonance log probe of detecting area and its detection method | |
| JPH01152348A (en) | Nuclear magnetic resonance detection apparatus and method | |
| Liu et al. | Construction of an Overhauser magnetic gradiometer and the applications in geomagnetic observation and ferromagnetic target localization | |
| Jackson | Nuclear magnetic resonance well logging | |
| US2916690A (en) | Apparatus for measuring magnetic fields | |
| CN113216948B (en) | Multi-coil-structure while-drilling nuclear magnetic resonance logging device and method | |
| CN115288667A (en) | Nuclear magnetic logging while drilling instrument probe with static magnetic field compensation | |
| US4114087A (en) | Magnetic or electric measuring devices | |
| CN204679654U (en) | A kind of nuclear magnetic resonance for complex environment surveys magnetic device | |
| CA2468735A1 (en) | Nmr apparatus for oil well logging of large and small diameter wells | |
| CN115308651A (en) | Fluxgate sensor and working method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |