CN110761782B - Direction while-drilling nuclear magnetic resonance logging device for geosteering - Google Patents
Direction while-drilling nuclear magnetic resonance logging device for geosteering Download PDFInfo
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- CN110761782B CN110761782B CN201911107678.9A CN201911107678A CN110761782B CN 110761782 B CN110761782 B CN 110761782B CN 201911107678 A CN201911107678 A CN 201911107678A CN 110761782 B CN110761782 B CN 110761782B
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- 238000005553 drilling Methods 0.000 title claims abstract description 82
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/026—Determining slope or direction of penetrated ground layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention relates to a logging device, belongs to the technical field of petroleum drilling engineering, and particularly relates to a direction while-drilling nuclear magnetic resonance logging device for geosteering. Including instrument probe, the instrument probe includes: two tubular column magnets arranged at a certain distance in the axial direction, wherein each tubular column magnet group comprises a plurality of magnetic rings which are sequentially arranged in the axial direction, and each magnetic ring is formed by a plurality of sector magnetic blocks; the probe antenna is wound on the coil bracket, 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 with the static magnetic field generated by the tubular magnet. Therefore, the invention has the advantages that: the method can be used in geosteering drilling operation, and simultaneously can adjust NMR measurement data according to the ambient temperature along with the increase of the well depth, so that the accuracy of measurement results is ensured.
Description
Technical Field
The invention relates to a logging device and a logging method, belongs to the technical field of petroleum drilling engineering, and particularly relates to a azimuth while-drilling nuclear magnetic resonance logging device for geosteering.
Background
The nuclear magnetic resonance technology (NMR) 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 realize observation and measurement of stratum information, the technology is not influenced by a rock skeleton, porosity information can be directly obtained, a detection tool does not contain a radioactive source, the influence on the environment is small, and the field construction operation is facilitated.
With the increasing number of low, deep, sea and non-equal complex oil and gas reservoirs as objects for exploration and development, the nuclear magnetic resonance logging technology also faces new technical challenges, especially the development of shale oil and gas at the present stage, so that the horizontal well technology is applied in a large scale, and the geosteering technology serving as one of the horizontal well drilling sharp instruments is the development direction of the well drilling tool of the well track control technology in the future. Geosteering tools are not uniform in the formation surrounding a borehole during horizontal well operations, where the azimuthal requirements of the geosteering operations on formation information are high, and therefore the detection tools are required to have a strong azimuthal resolution. The azimuth while-drilling nuclear magnetic resonance technology can realize the detection of undisturbed stratum information in all directions and upload the information to a ground system in real time, thereby being beneficial to drilling engineers to make real-time drilling decisions and ensuring that the well track is positioned in a target layer.
The azimuth while-drilling nuclear magnetic resonance logging device and method in the prior art do not have azimuth resolution capability, and the measurement method is difficult to adjust in the pit according to the change of the ambient temperature so as to ensure the quality of measured data, and the NMR measurement result is difficult to correct and compensate accurately in real time.
Therefore, the improvement on the azimuth while drilling nuclear magnetic resonance logging device and method for geosteering in the prior art to meet the requirements of different application scenes is a technical problem which needs to be solved currently.
Disclosure of Invention
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 invention aims to solve the problems and the defects of the prior art and provide a direction while drilling nuclear magnetic resonance logging device and a method for geosteering, which have direction sensitivity, can be used in geosteering drilling operation, can be applied to drilling tools in a rotary or sliding drilling mode, can adjust NMR measurement data according to environmental temperature along with increase of well depth, and ensure accuracy of measurement results.
In order to solve the problems, the scheme of the invention is as follows:
a azimuth while drilling nuclear magnetic resonance logging device for geosteering, comprising an instrument probe, the instrument probe comprising:
two tubular column magnets arranged at a certain distance in the axial direction, wherein each tubular column magnet group comprises a plurality of magnetic rings which are sequentially arranged in the axial direction, and each magnetic ring is formed by a plurality of sector magnetic blocks;
the probe antenna is wound on the coil bracket, 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 with the static magnetic field generated by the tubular magnet.
Preferably, one of the above-described azimuthal nuclear magnetic resonance logging while drilling apparatus for geosteering,
the tubular column-shaped magnet sequentially comprises magnetic pole magnetic steel, magnetic pole magnetic steel wrapping cloth and an outer magnet protection sleeve from inside to outside along the radial direction.
Preferably, the above-mentioned azimuth while drilling nmr logging device for geosteering, the probe antenna comprises:
a cylindrical sleeve formed by soft magnetic materials, a coil bracket positioned outside the cylindrical sleeve, a coil sleeved on the coil bracket, and a high-strength toughened glass sleeve positioned outside the coil;
the coil support is made of polytetrafluoroethylene, spiral grooves are uniformly formed in the middle of the coil support, the coil is wound in the spiral grooves, and outgoing wires at two ends of the coil are led out through small holes.
Preferably, one of the above-described azimuthal nuclear magnetic resonance logging while drilling apparatus for geosteering,
the antenna sleeve is axially divided into two symmetrical semicircular cylinder structures; and at least one semicircular cylinder body structure is provided with a groove body.
Preferably, one of the above-described azimuthal nuclear magnetic resonance logging while drilling apparatus for geosteering,
the antenna sleeve is axially divided into two symmetrical semicircular cylinder structures; and only one semicircular cylinder body structure is provided with a groove body.
Preferably, one of the above-described azimuthal nuclear magnetic resonance logging while drilling apparatus for geosteering,
further comprises: the energy storage nipple is used for storing high-voltage electric energy for the transmitting circuit and is formed by connecting a plurality of capacitor groups in series and/or in parallel, and each capacitor group is connected with the radio-frequency transmitting circuit through a filtering module.
Preferably, one of the above-described azimuthal nuclear magnetic resonance logging while drilling apparatus for geosteering,
further comprises: measurement and control electronic circuit nipple joint, it includes: the system comprises a main control circuit, a power supply conversion circuit, an upper computer, a measurement while-drilling azimuth circuit, a radio frequency transmitting circuit and an echo acquisition circuit, wherein the power supply conversion circuit is connected with the main control circuit, and the radio frequency transmitting circuit and the echo acquisition circuit are connected with a probe antenna assembly.
A method of logging a well using the apparatus described above, comprising:
the azimuth-free measurement mode is used for logging while drilling operation insensitive to the azimuth of a drilling tool, and specifically comprises the following steps: grooves are formed in the upper portion and the lower portion of the antenna sleeve, radio frequency pulses are emitted from the grooves to the circumferential direction, and nuclear magnetic resonance echo signals returned from the stratum are received through the grooves.
Preferably, the method for logging by using the device comprises the following steps:
the sliding azimuth measurement mode is used for collecting azimuth nuclear magnetic resonance echo signals in the sliding drilling process, and specifically comprises the following steps: the antenna sleeve is divided into two halves along the axis, the notch is arranged on only one half of the antenna sleeve, and the porosity information of the stratum is judged according to the azimuth data measured by the azimuth sensor.
Preferably, the method for logging by using the device comprises the following steps:
the rotary azimuth measurement mode is used for acquiring azimuth porosity information of the drilling tool circumferential stratum subjected to continuous rotary drilling, and specifically comprises the following steps: dividing the antenna sleeve into two halves along the axis, only arranging a notch on one half, utilizing the notch surface to rotate along with the drilling tool to finish detection of stratum at all angles in the circumferential direction, recording an echo signal received by the probe antenna, an azimuth signal acquired by the position and azimuth sensor and the drilling tool rotating speed recorded by the rotating speed sensor at the current position and at the current time, and acquiring stratum porosity values corresponding to the antenna housing provided with the notch at the position and the azimuth through recorded data.
Therefore, the invention has the advantages that: the method can be used in geosteering drilling operation (the drilling tool is in a rotary or sliding drilling mode) and can adjust NMR measurement data according to the ambient temperature along with the increase of the well depth, so that the accuracy of measurement results 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 while drilling NMR logging device;
FIG. 2 is a block diagram of the upper main magnet unit of the probe;
FIG. 3 is a block diagram of a main magnet unit at the lower part of the probe;
FIG. 4 is a schematic diagram of an antenna assembly;
fig. 5 is a view showing the structure of an antenna outer shield;
FIG. 6 is a schematic diagram of a joint transfer structure of a probe and a measurement and control electronic circuit;
FIG. 7 is a diagram showing static magnetic distribution of a probe resonance region;
FIG. 8 is a schematic diagram of a method of winding a resonant antenna;
FIG. 9 is a schematic diagram of an antenna tuning capacitor assembly;
FIG. 10 is a block diagram of a device energy storage sub;
FIG. 11 is a block diagram of the device measurement and control electronics circuitry;
FIG. 12 is a flow chart of the method for measuring the nuclear magnetic resonance while drilling of the azimuth.
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 geosteering is mainly composed of a non-magnetic drill collar, a drilling fluid channel, a main magnet group, a radio frequency antenna, a control and communication circuit, a measuring and storage circuit, an antenna tuning circuit, a temperature sensor, an azimuth sensor, a rotating speed sensor, a data processing and compressing module and various protection and vibration reduction structures, and can transmit radio frequency pulses to a stratum through various sensors according to ground instructions or preset programs, acquire echo signals through a receiving antenna for processing and inversion, store stratum porosity information in an instrument or upload the stratum porosity information to a ground system through an MWD (measurement while drilling) for an operation engineer to make real-time drilling decisions, optimize a well track and ensure that the drilling tool is more positioned in a target reservoir. The following description will be made separately.
Mechanical body structure of device
In the embodiment, the overall structure of the device is shown in fig. 1, the whole system consists of a 103 energy storage nipple, a 104 measurement and control electronic circuit nipple and a 105 probe nipple, a 102 non-magnetic drill collar is used as a carrier of the functional module, and a 101 drilling fluid channel is an important component of drilling tool mud circulation.
The instrument probe 105 is composed of main modules such as a main magnet set, a transmitting antenna, a magnet and antenna protection sleeve, a capacitance tuning circuit, an antenna measuring unit, a sealing, wear-resisting and protection structure, etc.
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 permanent magnets can be selected to be 350-550 mm. Fig. 2 is a schematic view of the appearance of the upper half probe structure and the circumferential expansion of the upper permanent magnet steel. The upper half probe mainly comprises: joints electrically and mechanically connected with other pup joints, permanent magnet steel at the upper part of the main magnet assembly, magnet wrapping cloth, a protecting sleeve outside the magnet group and the like. The permanent magnet is of an annular structure, 6 sector magnetic blocks are bonded to form a magnetic ring, the magnetizing direction is the axial direction, and 10 magnetic rings are axially bonded to form the whole magnetic steel. The drill collar is made of non-magnetic material, no interaction force exists between the magnetic steel and the drill collar, and in the embodiment, two modes of assembling the magnetic pole magnetic steel are provided: 1. the magnetic steel is not magnetized, and after each small magnetic block is adhered to the surface of the drill collar through high-strength anaerobic adhesive, the whole magnetization is carried out; 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 by a large-scale magnetizing machine, the magnetic field distribution is not uniform, the magnetizing effect is not ideal, and the rectification is difficult; 2. the small magnet blocks are magnetized in advance, then the magnetic steel is fixed on the surface of the drill collar through a self-made tool, and the magnetic steel is fixed through high-strength anaerobic adhesive, so that the process flow is relatively complex, the assembly risk is high, the bonding period is longer, but the magnetizing is relatively uniform and the correction is convenient. In this embodiment, the bonding gaps between the magnetic rings may be selected to be staggered by 30 ° to 60 ° as shown in the magnetic steel layout diagram in fig. 2, so that the circumferential uniformity of the static magnetic field may be further ensured.
FIG. 3 shows a lower probe structure including a joint for electrical and mechanical connection with other downhole tools, a main magnet assembly lower permanent magnet steel, a magnet wrap, an outer protective sleeve, an antenna measurement and debug circuitry capsule, and the like. The bonding structure of the lower permanent magnet and the upper permanent magnet is the same, and the magnetic poles are opposite. The magnet outer protection sleeve is made of nonmagnetic titanium alloy, such as TC4, and the magnet is isolated from the external environment through structures such as O-shaped or mountain-shaped sealing rings, so that air and drilling fluid are prevented from entering the cabin, the magnetic steel is protected from being corroded, and an electronic circuit is prevented from being shorted. Through the wire through hole and the antenna measuring and debugging cabin, various electrical functions of the nuclear magnetic resonance probe can be debugged, the function expansion can be realized, the energy storage nipple 103 and the measurement and control electronic circuit nipple 104 can be selectively arranged below the probe, and the connection and the debugging of an electrical system can be realized through a butt joint structure.
The probe antenna is a key unit for resonance emission and echo signal reception, the embodiment adopts an electromagnetic coupling mode to measure resonance signals, and only responds to signals within a certain bandwidth of Larmor precession frequency of a stratum area to be measured, so that a radio frequency field generated by the antenna and a static magnetic field generated by a main magnet can be subjected to orthogonal matching as shown in fig. 8 by using a solenoid-shaped structure antenna integrating transmission and reception, 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 the tuning of the working frequency of the antenna is realized by embedding a capacitance tuning module below the antenna. In this embodiment, an optional static magnetic field intensity is between 130Gs and 150Gs, the antenna operating frequency should be between 550kHz and 650kHz, the tuning capacitor may be 40nF, and the fixed capacitor 40nF, as shown in fig. 9, and the capacitor set and the probe antenna optimize the antenna frequency in a serial or parallel manner.
From the mechanical structure, as shown in fig. 4, the antenna assembly comprises soft magnetic materials, high-strength toughened glass, a tuning capacitor cabin, a coil support, an outgoing line wire passing structure and the like. In this embodiment, the soft magnetic structure is used as an optional device, and is mainly used for improving the uniformity of the static magnetic field, enhancing the amplitude of the transmitting and receiving signals of the coil, and the soft magnetic member is of a circular ring structure, is cut along the axis, is fixed together through four socket head cap screws, and is sleeved on the drill collar. The coil support material can be polytetrafluoroethylene, the middle position is uniformly provided with a spiral groove, the probe antenna coil is wound in the spiral groove, the probe antenna material can be copper foil or enameled wire, and the like, and outgoing wires at two ends of the coil are led out through small holes. After the resonance transmitting coil is tested, the whole encapsulation is needed, the circuit is ensured not to be influenced by external environment, and the outer layer is provided with a high-strength toughened glass sleeve which mainly plays a role in protecting the coil and soft magnetic materials from being damaged by impact pressure.
The outermost 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 the emitted electromagnetic wave not to be shielded by the sleeve and enter a stratum, and meanwhile stratum echo signals can be successfully collected by the antenna, whether grooving is carried out on the upper part and the lower part according to different choices of measurement modes (three measurement modes are provided in the embodiment), and the sleeve is fixed on the drill collar through a screw structure 504 in a combined mode of grooving on the upper half ring and the lower half ring, grooving on the upper part, grooving on the lower part, grooving-free on the outer sleeve and the like.
The upper protection joint is shown in fig. 6, the part of the 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 protection joint is as follows: 1) In the drilling process, the measuring instrument is frequently started and tripped, the connector is protected from damage of the end buckle of the probe body, and once the port of the probe body is damaged, the whole probe is at a scrapping risk; 2) The connector can be internally provided with an electric connection structure such as a wire through hole or a four-core slip ring, and the like, so that the probe is convenient to be connected with electronic circuits of other modules, and the probe is powered or communicated with an electric wire.
(II) Electrical System architecture
The main function of the energy storage nipple 103 is to store a large amount of high-voltage electric energy for a transmitting circuit, ensure that the instrument can continuously transmit 20 kW-level radio frequency pulses underground, and provide a schematic block diagram for realizing the nipple in the embodiment. The energy storage nipple consists of a plurality of capacitor groups connected in series or in parallel, wherein a plurality of capacitors can be selected to be connected in series to form one capacitor group, and then the capacitor groups are connected in parallel. In the radio frequency pulse transmission gap, the energy storage module supplies power through the underground power supply to supplement and store electric energy, and when the pulse is transmitted, the energy is provided for the transmission circuit, and the main control module can realize discharge control of the energy storage module through the filtering module.
The functions realized by the measurement and control electronic circuit nipple 104 comprise the steps of receiving commands of an upper computer and an 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 whole set of circuit system is powered by an underground 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 added and used as a direct current stabilized voltage power supply required by other modules in working. The main control circuit has the functions of communicating with the upper computer, issuing an upper computer command, controlling the instrument to work, 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 radio frequency transmitting circuit is integrated in the main control module, and the DSP chip of the main control module generates the pulse signal with fixed frequency and bandwidth. The radio frequency transmitting circuit receives the excitation signal, generates a high-power transmitting signal under the power energy provided by the energy storage pup joint, optionally adds a transmitting filtering module, filters the signal, reduces noise, and transmits the signal to the stratum through the probe antenna. The echo acquisition circuit is required to be internally provided with a pre-amplifying module, amplifies echo signals returned by the stratum, processes signals output by the pre-amplifying module, and transmits the signals to the main control module, and the signals can be selectively stored in the device or uploaded to an upper computer for drilling engineers to adjust the track of the well.
(III) azimuth nuclear magnetic resonance measurement while drilling method
(1) Mode one: and a method for measuring azimuth-free information. The mode is used for logging while drilling operation insensitive to the drilling tool orientation, the upper part 501 and the lower part 502 of the probe antenna housing are respectively provided with a groove plate, no matter the drilling tool is in drilling stop, sliding drilling or rotary drilling, the probe antenna can emit radio frequency pulses to 360 degrees in the circumferential direction through the grooves of the antenna housing, and simultaneously nuclear magnetic resonance echo signals returned from a stratum can also be received through the grooves, and the signals can be selectively stored in an instrument after data processing and inversion calculation or uploaded to an upper ground computer through MWD.
(2) Mode two: a sliding orientation measurement method. In this embodiment, the method refers to that during sliding drilling of the drilling tool, the echo signals with azimuth nuclear magnetic resonance are acquired. In this mode, the upper part 501 of the probe antenna housing selects a slotted plate, the lower part selects a totally-enclosed cover plate without slots, under this structure, the probe antenna can only transmit radio frequency pulses to the stratum through the slots on the 501 housing, and can only receive stratum echo signals through the slots, at this time, the data collected by the probe only reflect stratum information of the corresponding azimuth of the upper part of the probe, and under the sliding mode drilling condition, the porosity information of the stratum in this direction can be judged by combining the azimuth data measured by the azimuth sensor. If the drill bit changes azimuth due to BHA transverse vibration and the like in the sliding drilling process, azimuth sensor data need to be acquired again so as to further process azimuth porosity information.
(3) Mode three: a rotational orientation measurement method. Such a measurement mode may be employed when it is desired to obtain azimuthal porosity information of the formation circumferentially around the drilling tool being continuously rotated. In this embodiment, the rotational speed of the rotary drilling tool is considered to be constant in a short time, and if special conditions such as sticking are met, the rotary drilling tool needs to be further processed according to the working conditions of the site. In this mode of operation, the probe antenna housing structure is the same as mode two, the upper portion 501 of the probe antenna housing selects a slotted plate, the lower portion selects a totally-enclosed cover plate without slots, under this structure, the probe antenna can only transmit radio frequency pulses to the formation through the slots on the 501 housing, and receive formation echo signals through the slots. In the mode, the drilling tool is in a rotary drilling state, and the notch on the upper half part of the probe can perform 360-degree rotary motion along with the rotation of the drilling tool, namely the notch surface of the probe can complete detection of stratum at all angles along with the rotation of the drilling tool. Therefore, in the position rotated to each angle, the probe inversion calculation module needs the echo signal received by the probe antenna, the azimuth signal acquired by the position and azimuth sensor and the rotation speed of the drilling tool recorded by the rotation speed sensor at the current position and the current time, and the 3 data can be used for completely describing the position and the stratum porosity value corresponding to the upper half antenna housing of the probe under the azimuth. The calculation results may be stored in the device by a data storage unit or uploaded to a surface host computer by MWD.
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 would be understood and appreciated by those skilled in the art.
Note that references in the specification to "one embodiment," "an embodiment," "example embodiments," "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. Furthermore, 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 (5)
1. A azimuth while drilling nuclear magnetic resonance logging device for geosteering, comprising an instrument probe (105), the instrument probe (105) comprising:
the magnetic poles of the two tubular column-shaped permanent magnets are oppositely arranged along the axial direction, each tubular column-shaped magnet group comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, a plurality of sector-shaped magnetic blocks are bonded along the circumferential direction to form the magnetic rings, and bonding gaps of adjacent magnetic rings are staggered by 30-60 degrees;
the probe antenna is wound on the coil bracket, the coil is sleeved on the coil bracket, an antenna sleeve is arranged outside the coil, and a groove body (503) is formed in the antenna sleeve;
wherein, the radio frequency field generated by the coil is in orthogonal match with the static magnetic field generated by the tubular magnet;
the antenna sleeve is axially divided into two symmetrical semicircular cylinder structures; and at least one semicircular cylinder body structure is provided with a groove body;
azimuth while drilling nmr logging device for geosteering has three measurement modes, including:
the azimuth-free measurement mode is used for logging while drilling operation insensitive to the azimuth of a drilling tool, and specifically comprises the following steps: grooves are formed in the upper portion and the lower portion of the antenna sleeve, radio frequency pulses are emitted from the grooves to the circumferential direction, and nuclear magnetic resonance echo signals returned from the stratum are received through the grooves;
the sliding azimuth measurement mode is used for collecting azimuth nuclear magnetic resonance echo signals in the sliding drilling process, and specifically comprises the following steps: dividing the antenna sleeve into two halves along the axis, only arranging notch on one half, and judging the porosity information of the stratum according to the azimuth data measured by the azimuth sensor;
the rotary azimuth measurement mode is used for acquiring azimuth porosity information of the drilling tool circumferential stratum subjected to continuous rotary drilling, and specifically comprises the following steps: dividing the antenna sleeve into two halves along the axis, only arranging a notch on one half, utilizing the notch surface to rotate along with the drilling tool to finish detection of stratum at all angles in the circumferential direction, recording an echo signal received by the probe antenna, an azimuth signal acquired by the position and azimuth sensor and the drilling tool rotating speed recorded by the rotating speed sensor at the current position and at the current time, and acquiring stratum porosity values corresponding to the antenna housing provided with the notch at the position and the azimuth through recorded data.
2. A azimuth while drilling nuclear magnetic resonance logging device for geosteering according to claim 1,
the tubular column-shaped magnet sequentially comprises magnetic pole magnetic steel, magnetic pole magnetic steel wrapping cloth and an outer magnet protection sleeve from inside to outside along the radial direction.
3. A azimuth while drilling nmr logging device for geosteering as defined in claim 1, wherein the probe antenna comprises:
a cylindrical sleeve formed by soft magnetic materials, a coil bracket positioned outside the cylindrical sleeve, a coil sleeved on the coil bracket and a high-strength toughened glass sleeve positioned outside the coil;
the coil support is made of polytetrafluoroethylene, spiral grooves are uniformly formed in the middle of the coil support, the coil is wound in the spiral grooves, and outgoing wires at two ends of the coil are led out through small holes.
4. A azimuth while drilling nmr logging device for geosteering as defined in claim 1, further comprising: and the energy storage short joint (103) is used for storing high-voltage electric energy for a transmitting circuit, the energy storage short joint (103) is formed by connecting a plurality of capacitor groups in series and/or in parallel, and each capacitor group is connected with the radio-frequency transmitting circuit through a filtering module.
5. A azimuth while drilling nmr logging device for geosteering as defined in claim 1, further comprising: measurement and control electronics cartridge (104), comprising: the system comprises a main control circuit, a power supply conversion circuit, an upper computer, a measurement while-drilling azimuth circuit, a radio frequency transmitting circuit and an echo acquisition circuit, wherein the power supply conversion circuit is connected with the main control circuit, and the radio frequency transmitting circuit and the echo acquisition circuit are connected with a probe antenna assembly.
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| CN113216948B (en) * | 2021-05-19 | 2023-03-24 | 中国石油大学(北京) | Multi-coil-structure while-drilling nuclear magnetic resonance logging device and method |
| CN114613569B (en) * | 2022-03-14 | 2022-11-11 | 华中科技大学 | Method and device for axially magnetizing permanent magnet ring |
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