CN211144481U - A nuclear magnetic resonance logging device is bored to position for geological orientation - Google Patents
A nuclear magnetic resonance logging device is bored to position for geological orientation Download PDFInfo
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- CN211144481U CN211144481U CN201921954920.1U CN201921954920U CN211144481U CN 211144481 U CN211144481 U CN 211144481U CN 201921954920 U CN201921954920 U CN 201921954920U CN 211144481 U CN211144481 U CN 211144481U
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Abstract
The utility model relates to a logging device belongs to oil drilling engineering technical field, specifically is a nuclear magnetic resonance logging device is bored to position for geological guide. Including the instrument probe, the instrument probe includes: the magnetic ring structure comprises two tubular columnar magnets which are arranged at a certain distance in the axial direction, wherein each tubular columnar magnet group comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, and each magnetic ring is composed of a plurality of fan-shaped magnetic blocks; the probe antenna is wound on the coil support, an antenna sleeve is arranged outside the probe antenna, and a groove body is formed in the antenna sleeve; wherein the radio frequency field generated by the coil is orthogonally matched to the static magnetic field generated by the tubular magnet. Therefore, the utility model has the advantages that: the method can be used for geosteering well drilling operation, and simultaneously, NMR measurement data can be adjusted according to the environmental temperature along with the increase of the well depth, so that the accuracy of the measurement result is ensured.
Description
Technical Field
The utility model relates to a logging device belongs to oil drilling engineering technical field, specifically is a nuclear magnetic resonance logging device is bored to position for geological guide.
Background
The Nuclear Magnetic Resonance (NMR) technology is applied to the underground environment, the basic principle is that the interaction of hydrogen nuclei in the stratum and a magnetic field is utilized to generate resonance so as to observe and measure the information of the stratum, the technology is not influenced by a rock framework, the porosity information can be directly obtained, and a detection tool does not contain a radioactive source, has small influence on the environment and is more beneficial to field construction operation.
With complex oil and gas reservoirs such as low, deep, sea and non-equal oil and gas reservoirs becoming more and more targets for exploration and development, the nuclear magnetic resonance logging technology also faces new technical challenges, particularly the shale oil and gas development at the present stage, so that the horizontal well technology is applied in a large scale, and the geosteering technology which is one of the horizontal well drilling edge tools is a development direction of well drilling tools of the well track control technology in the future. In the process of horizontal well operation, the stratum around the drilled well is uneven, and the geological steering operation has high requirements on the orientation of stratum information, so that the detection tool is required to have strong orientation resolution capability. The azimuth while-drilling nuclear magnetic resonance technology can realize the detection of the information of the undisturbed stratum in all directions and upload the information to a ground system in real time, is beneficial to a drilling engineer to make a real-time drilling decision and ensures that a well track is in a target layer.
The orientation-while-drilling nuclear magnetic resonance logging device in the prior art does not have the orientation resolution capability, the measurement method is difficult to adjust underground according to the change of the environmental temperature so as to ensure the quality of the measured data, and the NMR measurement result is difficult to correct and compensate accurately in real time.
Therefore, the improvement of the azimuth nuclear magnetic resonance logging-while-drilling device for geosteering in the prior art to meet the requirements of different application scenes is a technical problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
The utility model discloses the purpose is to solve the above-mentioned problem and the weak point that prior art exists, provides a position nuclear magnetic resonance logging device while drilling for geology direction, and the device has the direction sensitivity, can be used to among the geology direction drilling operation, and it is applicable that the drilling tool is in homoenergetic under rotatory or the slip drilling mode, can adjust NMR measured data along with the increase of well depth simultaneously according to ambient temperature, guarantees measuring result's the degree of accuracy.
In order to solve the above problem, the utility model discloses a scheme is:
an azimuthal while-drilling nuclear magnetic resonance logging device for geosteering, comprising an instrument probe, the instrument probe comprising:
the magnetic ring structure comprises two tubular columnar magnets which are arranged at a certain distance in the axial direction, wherein each tubular columnar magnet group comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, and each magnetic ring is composed of a plurality of fan-shaped magnetic blocks;
the probe antenna is wound on the coil support, an antenna sleeve is arranged outside the probe antenna, and a groove body is formed in the antenna sleeve;
wherein the radio frequency field generated by the coil is orthogonally matched to the static magnetic field generated by the tubular magnet.
Preferably, the above-mentioned azimuthal while-drilling nuclear magnetic resonance logging device for geosteering,
the tubular magnet sequentially comprises magnetic pole magnetic steel, magnetic pole magnetic steel wrapping cloth and a magnet outer protective sleeve from inside to outside along the radial direction.
Preferably, the above-mentioned azimuthal nuclear magnetic resonance logging while drilling device for geosteering comprises:
the coil comprises a cylindrical sleeve made of soft magnetic materials, a coil support positioned outside the cylindrical sleeve, a coil sleeved on the coil support, and a high-strength toughened glass sleeve positioned outside the coil;
the coil support is made of polytetrafluoroethylene, spiral slots are uniformly formed in the middle position of the coil support, the coil is wound in the spiral slots, and outgoing lines at two ends of the coil are led out through the small holes.
Preferably, the above-mentioned azimuthal while-drilling nuclear magnetic resonance logging device for geosteering,
the antenna sleeve is divided into two symmetrical semicircular cylinder structures along the axial direction; and at least one semicircular cylinder structure is provided with a groove body.
Preferably, the above-mentioned azimuthal while-drilling nuclear magnetic resonance logging device for geosteering,
the antenna sleeve is divided into two symmetrical semicircular cylinder structures along the axial direction; and only one semicircular cylinder structure is provided with a groove body.
Preferably, the above-mentioned azimuthal while-drilling nuclear magnetic resonance logging device for geosteering,
further comprising: the energy storage short section is used for storing high-voltage electric energy for the transmitting circuit and is formed by connecting a plurality of capacitor sets in series and/or in parallel, and each capacitor set is connected with the radio frequency transmitting circuit through a filtering module.
Preferably, the above-mentioned azimuthal while-drilling nuclear magnetic resonance logging device for geosteering,
further comprising: observe and control electronic circuit nipple joint, it includes: the device comprises a main control circuit, a power supply conversion circuit connected with the main control circuit, an upper computer, a measurement while drilling circuit, a radio frequency transmitting circuit and an echo acquisition circuit, wherein the radio frequency transmitting circuit and the echo acquisition circuit are connected with a probe antenna assembly.
Therefore, the utility model has the advantages that: the method can be used in geosteering drilling operation (the drilling tool is suitable for both a rotary drilling mode and a sliding drilling mode), and simultaneously, NMR measurement data can be adjusted according to the environmental temperature along with the increase of the well depth, so that the accuracy of a measurement result is ensured.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.
FIG. 1 is an overall structure of an azimuth nuclear magnetic resonance logging-while-drilling device;
FIG. 2 is a diagram of the upper main magnet unit of the probe;
FIG. 3 is a diagram of the probe lower main magnet unit structure;
FIG. 4 is a schematic diagram of an antenna assembly;
FIG. 5 is a diagram of the structure of the antenna outer protective cover;
FIG. 6 is a schematic diagram of a short section switching structure of a probe and a measurement and control electronic circuit;
FIG. 7 is a diagram showing the magnetostatic distribution in the resonance region of the probe;
FIG. 8 is a schematic diagram of a resonant antenna winding method;
FIG. 9 is a schematic diagram of an antenna tuning capacitor assembly;
FIG. 10 is a block diagram of an energy storage short section of the device;
FIG. 11 is a block diagram of the device measurement and control electronic circuitry;
FIG. 12 is a flow chart of a method for measuring the orientation while drilling nuclear magnetic resonance.
Embodiments of the present invention will be described with reference to the accompanying drawings.
Detailed Description
Examples
The azimuth while-drilling nuclear magnetic resonance logging device for geological steering mainly comprises a non-magnetic drill collar, a drilling fluid channel, a main magnet group, a radio frequency antenna, a control and communication circuit, a measurement and storage circuit, an antenna tuning circuit, a temperature sensor, an azimuth sensor, a rotating speed sensor, a data processing and compression module and various protection and vibration reduction structures, can transmit radio frequency pulses to a stratum through feedback of various sensors according to ground instructions or preset programs, collects echo signals through a receiving antenna to process and invert, stores stratum porosity information in an instrument or uploads the stratum porosity information to a ground system through MWD (measurement while drilling), provides an operation engineer with real-time drilling decision, optimizes a well track and ensures that more drilling tools are positioned in a target reservoir. The following are described separately.
Device main body structure
In the embodiment, the overall structure of the device is shown in fig. 1, the whole system is composed of 103 energy storage pups, 104 measurement and control electronic circuit pups and 105 probe pups, 102 non-magnetic drill collars are used as carriers of the functional modules, and 101 drilling fluid channels are important components of drilling tool mud circulation.
The instrument probe 105 is composed of main modules including a main magnet group, a transmitting antenna, a magnet, an antenna protective sleeve, a capacitance tuning circuit, an antenna measuring unit, a sealing structure, a wear-resisting structure, a protecting structure and the like.
The main magnet group consists of an upper tubular permanent magnet and a lower tubular permanent magnet with opposite magnetic poles, and the axial distance between the two magnets can be selected from 350 mm to 550 mm. FIG. 2 is a schematic view of the appearance of the upper probe structure and the circumferential expansion of the upper permanent magnet steel. In the figure, a joint 201, an outer protective sleeve 202, magnetic pole steel magnets 203, magnetic pole steel wrapping cloth 204 and an O-shaped sealing ring 205 are arranged. The upper half probe mainly comprises: the connector is electrically and mechanically connected with other short sections, the permanent magnet steel at the upper part of the main magnet assembly, the magnet wrapping cloth, the outer protective sleeve of the magnet group and the like. The permanent magnet is of a ring-shaped structure, 6 fan-shaped magnetic blocks are bonded into one magnetic ring, the magnetizing direction is axial, and 10 magnetic rings are axially bonded into the whole magnetic steel. The drill collar material is no magnetic material, does not have interact for magnetic steel and drill collar, and in this embodiment, the mode of magnetic pole magnet steel equipment has two kinds: 1. the magnetic steel is not magnetized, and each small magnetic block is bonded to the surface of the drill collar through the high-strength anaerobic adhesive and then is wholly magnetized; the process flow has the advantages that the bonding difficulty is low, the assembly process is safe and reliable, but the whole probe tool exceeds 2m, the whole magnetization can be completed only by a large magnetizing machine, the magnetic field distribution is not uniform enough, the magnetizing effect is not ideal, and the rectification and modification are difficult; 2. the small magnetic block is magnetized in advance, then the magnetic steel is fixed on the surface of the drill collar through a self-made tool and is bonded and fixed through high-strength anaerobic adhesive, the process flow is relatively complex, the assembly risk is high, the bonding period is long, but the magnetization is uniform and the rectification is convenient. In this embodiment, the bonding gaps between the magnetic rings may be staggered by 30 ° to 60 ° as shown in the magnetic steel layout in fig. 2, which can further ensure the circumferential uniformity of the static magnetic field.
Figure 3 shows the lower half probe configuration. In the figure, an outlet hole 301, an outer protective sleeve 302, magnetic pole magnetic steel 303, magnetic pole magnetic steel wrapping cloth 304, an O-shaped sealing ring 305, a wire through hole 306, a first wear strip 307, a measuring circuit bin 308, a second wear strip 309, a connector 310 and a butt joint structure 311. The device comprises a joint which is electrically and mechanically connected with other underground instruments, permanent magnet steel at the lower part of a main magnet assembly, magnet wrapping cloth, an outer protective sleeve, an antenna measuring and debugging circuit cabin body and the like. The lower half permanent magnet and the upper half permanent magnet have the same bonding structure and opposite magnetic poles. The magnet outer protective sleeve can be made of a non-magnetic titanium alloy material, such as TC4 and the like, and the magnet is isolated from the external environment through O-shaped or mountain-shaped sealing rings and other structures, so that air and drilling fluid cannot enter the cabin body, the magnetic steel is protected from being corroded, and an electronic circuit is prevented from being short-circuited. Through crossing the line hole and the cabin body of antenna measurement and debugging, can debug each item electrical function of nuclear magnetic resonance probe and realize the function expansion, also can choose to arrange energy storage nipple joint 103 and observing and controlling electronic circuit nipple joint 104 in the probe below, can realize electric system's connection and debugging through butt joint structure.
The probe antenna is a key unit for resonance emission and echo signal reception, and the embodiment measures resonance signals in an electromagnetic coupling mode and only responds to signals in a certain bandwidth of larmor precession frequency of a stratum region to be measured, so that a transmitting and receiving integrated solenoid-shaped structure antenna is used, as shown in fig. 8, a radio frequency field generated by the antenna and a static magnetic field generated by a main magnet can be orthogonally matched, the working frequency of the antenna can be calculated according to the magnetic field intensity of the static magnetic in the stratum to be measured, and tuning of the working frequency of the antenna is realized by embedding a capacitance tuning module below the antenna. In the present embodiment, an optional static magnetic field strength is 130Gs to 150Gs, the antenna operating frequency should be between 550kHz and 650kHz, the tuning capacitance can be 40nF, and the fixed capacitance 40nF is used, as shown in fig. 9, the capacitance group and the probe antenna are connected in series or in parallel to optimize the antenna frequency.
From a mechanical point of view, as shown in fig. 4. In the figure, a soft magnetic material 401, a high-strength toughened glass sleeve 402, a coil 403, a capacitor circuit bin 404, a coil bracket 405 and an outlet hole 406. The antenna assembly comprises a soft magnetic material, high-strength toughened glass, a tuning capacitor cabin, a coil support, an outgoing line and threading structure and the like. In the embodiment, the soft magnetic structure is used as an optional device and mainly used for improving the uniformity of a static magnetic field and enhancing the amplitude of signals transmitted and received by the coil, and the soft magnetic part is of a circular ring structure, is cut along the axis, is fixed together through four inner hexagonal screws and is sleeved on the drill collar. The coil support can be made of polytetrafluoroethylene, spiral slots are uniformly formed in the middle of the coil support, the probe antenna coil is wound in the spiral slots, the probe antenna can be made of copper foil or enameled wire, and outgoing wires at two ends of the coil are led out through the small holes. After the resonance transmitting coil finishes testing, the whole encapsulation is needed, the circuit is guaranteed not to be affected by the external environment, and the outer layer is provided with the high-strength toughened glass sleeve to mainly protect the coil and the soft magnetic material from being damaged by impact pressure.
The outermost layer structure of the probe antenna is an antenna protection sleeve shown in fig. 5, the whole sleeve is composed of an upper half part 501 and a lower half part 502, the groove body 503 has the main function of enabling emitted electromagnetic waves to enter a stratum without being shielded by the sleeve, meanwhile, stratum echo signals can be collected by the antenna smoothly, the upper part and the lower part can be grooved or not according to different selection of measurement modes (three measurement modes are provided in the embodiment), for example, the upper half ring and the lower half ring are grooved or the upper part is grooved, the lower part is sleeved with no groove, and the sleeve is fixed on a drill collar through a screw structure 504.
The upper protective joint is shown in fig. 6, and the partial joint can be designed into a double-female-buckle structure, and a wear-resistant belt is arranged in the middle of the joint. The function of the protective joint is as follows: 1) in the drilling process, the drilling tool is frequently tripped out and used, the protective joint can prevent the end buckle of the probe body from being damaged, and once the port of the probe body is damaged, the whole probe faces the scrapping risk; 2) the inside of the joint can be provided with an electric connection structure such as a wire passing hole or a four-core slip ring, so that the probe can be conveniently connected with electronic circuits of other modules to supply power or communicate with wires of the probe.
(II) Electrical System Structure
The main function of the energy storage short section 103 is to store a large amount of high-voltage electric energy for the transmitting circuit, and ensure that the instrument can continuously transmit 20 kW-level radio frequency pulses in the underground. The energy storage short section is formed by connecting a large number of capacitor sets in series or in parallel, a plurality of capacitors can be selected to be connected in series to form a capacitor set, and then the plurality of capacitor sets are connected in parallel. In the radio frequency pulse emission gap, the energy storage module supplies power to supplement and store electric energy through the underground power supply, and provides energy for the emission circuit when the pulse is emitted, and the main control module can realize the discharge control of the energy storage module through the filtering module.
The functions realized by the measurement and control electronic circuit nipple 104 comprise receiving commands of an upper computer and MWD, uploading nuclear magnetic measurement data while drilling, controlling the working mode of a system, transmitting high-voltage pulses, collecting echo signals received by an antenna and the like, and can be divided into two parts of circuit control and measurement data processing according to the functions. The power supply of the whole circuit system is realized by a downhole power supply, a turbine generator or a battery pack can be selected, and when the turbine generator is selected, a power supply conversion circuit module is required to be added and used as a direct current stabilized power supply required by other modules during working. The master control circuit has the functions of communicating with an upper computer, issuing commands of the upper computer, controlling the work of an instrument, uploading data and the like, and is a core unit of the whole circuit system. In this embodiment, the excitation signal unit required by the rf transmitting circuit is integrated in the main control module, and a pulse signal with a fixed frequency and a fixed bandwidth is generated by the DSP chip of the main control module. The radio frequency transmitting circuit receives the excitation signal, generates a high-power transmitting signal under the power energy provided by the energy storage short section, can selectively add a transmitting and filtering module, filters the signal, reduces the noise, and transmits the signal to the stratum through the probe antenna. The echo acquisition circuit needs to be internally provided with a pre-amplification module, amplifies an echo signal returned by a stratum, processes a signal output by the pre-amplification module, transmits the signal to the main control module, and can be selectively stored in the device or uploaded to an upper computer for a drilling engineer to adjust a well track.
(III) orientation nuclear magnetic resonance measurement while drilling method
(1) The first mode is as follows: provided is a method for measuring orientation-free information. The mode is used for logging while drilling operation insensitive to the orientation of a drilling tool, the upper part 501 and the lower part 502 of the outer cover of the probe antenna are both provided with the notch plates, no matter the drilling tool is in drill stopping, sliding drilling or rotary drilling, the probe antenna can transmit radio frequency pulses to 360 degrees in the circumferential direction through the notches of the outer cover of the probe antenna, and meanwhile nuclear magnetic resonance echo signals returned from a stratum can be received through the notches, and the signals can be selectively stored in an instrument or uploaded to an upper computer on the ground through MWD after data processing and inversion calculation.
(2) And a second mode: a sliding orientation measuring method. In the embodiment, the method is used for acquiring echo signals with the azimuth nuclear magnetic resonance during the sliding drilling process of the drilling tool. In the mode, the upper part 501 of the outer cover of the probe antenna can select a notch plate, the lower part of the outer cover of the probe antenna can select a totally-enclosed cover plate without notches, under the structure, the probe antenna can only transmit radio frequency pulses to the stratum through the notches on the outer cover of the probe antenna, and can only receive stratum echo signals through the notches, at the moment, data collected by the probe only reflect stratum information of the corresponding position of the upper half part of the probe, and under the drilling condition of a sliding mode, the porosity information of the stratum in the direction can be judged by combining position data measured by a position sensor. If the orientation of the drilling tool is changed due to lateral vibration of BHA and other reasons in the sliding drilling process, the data of the orientation sensor needs to be acquired again so as to further process the information of the orientation porosity.
(3) And a third mode: a rotational orientation measurement method. This measurement mode may be used when it is desired to obtain azimuthal porosity information for a formation circumferentially of a tool that is continuously rotary drilled. In the embodiment, the rotation speed of the rotary drilling of the drilling tool in a short time is considered to be constant, and if special conditions such as drill sticking and the like are met, further processing is needed according to field operation conditions. In the working mode, the structure of the probe antenna housing is the same as that of the second mode, the upper part 501 of the probe antenna housing is a notch plate, and the lower part is a totally-enclosed cover plate without notches. In the mode, the drilling tool is in a rotary drilling state, the upper half part of the probe can rotate 360 degrees along with the rotation of the drilling tool, namely, the surface of the groove can complete the detection of the stratum at all angles along the circumferential direction along with the rotation of the drilling tool. Therefore, at the position rotated to each angle, the probe inversion calculation module needs the echo signal received by the probe antenna, the azimuth signal obtained by the position and azimuth sensor, and the rotation speed of the drilling tool at the current position and current time recorded by the rotation speed sensor, and through the 3 data, the formation porosity value corresponding to the position and the antenna housing at the upper half part of the probe in the azimuth can be completely described. The calculation result can be stored in the device through the data storage unit or uploaded to an upper computer on the ground through MWD.
In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.
It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An azimuthal nuclear magnetic resonance while drilling logging device for geosteering, comprising an instrument probe (105), characterized in that the instrument probe (105) comprises:
the magnetic ring structure comprises two tubular columnar magnets which are arranged at a certain distance in the axial direction, wherein each tubular columnar magnet group comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, and each magnetic ring is composed of a plurality of fan-shaped magnetic blocks;
the probe antenna is wound on the coil support, an antenna sleeve is arranged outside the probe antenna, and a groove body (503) is formed in the antenna sleeve;
wherein the radio frequency field generated by the coil is orthogonally matched to the static magnetic field generated by the tubular magnet.
2. The NMR logging device while drilling for geosteering of claim 1,
the tubular magnet sequentially comprises magnetic pole magnetic steel, magnetic pole magnetic steel wrapping cloth and a magnet outer protective sleeve from inside to outside along the radial direction.
3. The apparatus of claim 1, wherein the probe antenna comprises:
the coil comprises a cylindrical sleeve made of soft magnetic materials, a coil support positioned outside the cylindrical sleeve, a coil sleeved on the coil support, and a high-strength toughened glass sleeve positioned outside the coil;
the coil support is made of polytetrafluoroethylene, spiral slots are uniformly formed in the middle position of the coil support, the coil is wound in the spiral slots, and outgoing lines at two ends of the coil are led out through the small holes.
4. The device of claim 1, wherein the antenna sleeve is axially divided into two symmetrical semi-circular cylindrical structures; and at least one semicircular cylinder structure is provided with a groove body.
5. The device of claim 1, wherein the antenna sleeve is axially divided into two symmetrical semi-circular cylindrical structures; and only one semicircular cylinder structure is provided with a groove body.
6. The apparatus of claim 1, further comprising: the energy storage short section (103) is used for storing high-voltage electric energy for the transmitting circuit, the energy storage short section (103) is formed by connecting a plurality of capacitor sets in series and/or in parallel, and each capacitor set is connected with the radio frequency transmitting circuit through a filtering module.
7. The apparatus of claim 1, further comprising: measurement and control electronic circuit nipple (104), it includes: the device comprises a main control circuit, a power supply conversion circuit connected with the main control circuit, an upper computer, a measurement while drilling circuit, a radio frequency transmitting circuit and an echo acquisition circuit, wherein the radio frequency transmitting circuit and the echo acquisition circuit are connected with a probe antenna assembly.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761782A (en) * | 2019-11-13 | 2020-02-07 | 中国石油天然气集团有限公司 | Azimuth while-drilling nuclear magnetic resonance logging device and method for geological guidance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761782A (en) * | 2019-11-13 | 2020-02-07 | 中国石油天然气集团有限公司 | Azimuth while-drilling nuclear magnetic resonance logging device and method for geological guidance |
| CN110761782B (en) * | 2019-11-13 | 2024-02-09 | 中国石油天然气集团有限公司 | Direction while-drilling nuclear magnetic resonance logging device for geosteering |
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