CN113669051B - Magnetic joint for magnetic positioning, magnetic positioning system and magnetic positioning method - Google Patents
Magnetic joint for magnetic positioning, magnetic positioning system and magnetic positioning method Download PDFInfo
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- CN113669051B CN113669051B CN202111001136.0A CN202111001136A CN113669051B CN 113669051 B CN113669051 B CN 113669051B CN 202111001136 A CN202111001136 A CN 202111001136A CN 113669051 B CN113669051 B CN 113669051B
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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
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
- E21B47/0228—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
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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 discloses a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, which relate to the technical field of drilling measurement and comprise a non-magnetic rigid body, wherein a plurality of diversion coils are fixedly wound on the periphery of the non-magnetic rigid body, the axes of the diversion coils are parallel to the axes of the non-magnetic rigid body, a cavity is arranged in the non-magnetic rigid body, a vibration sensor, a battery and a controller are fixedly arranged in the cavity, the vibration sensor and the diversion coils are electrically connected with the controller, and the battery is used for providing electric energy for the vibration sensor, the diversion coils and the controller. The magnetic joint, the magnetic positioning system and the magnetic positioning method for magnetic positioning can be used for positioning and measuring vertical or nearly vertical wellbores, and can avoid magnetizing stratum containing ferromagnetic substances, so that the accuracy of a measurement result is improved.
Description
Technical Field
The invention relates to the technical field of drilling measurement, in particular to a magnetic joint for magnetic positioning, a magnetic positioning system and a magnetic positioning method.
Background
In the field of well drilling measurement, there is an active magnetic positioning technology, and the theoretical basis of the technology is that a magnetic joint (hereinafter referred to as a magnetic joint) with known magnetic moment and space gesture is used as a signal source, a probe tube is used as a signal receiving source, and the relative space position relationship of the two is calculated by analyzing an alternating current magnetic field. The magnetic moment, namely the intensity of the magnetic field of the magnetic joint, can be calibrated on the ground in advance, and is basically unchanged after entering the well. The space attitude refers to well deviation and azimuth of the rotating shaft of the magnetic joint, and is measured by a while-drilling instrument during construction. The two attitude parameters of the magnetic joint are basic data of the whole calculation, and are indispensable. However, when the well inclination of the magnetic joint is within 3 degrees, that is, when the rotating shaft of the magnetic joint is vertical or nearly vertical to the horizontal plane, the projection of the magnetic joint on the horizontal plane is not a line but a point, and no direction exists, that is, no azimuth value exists, so that the current positioning technology cannot be normally analyzed under the working condition. The conventional method is to artificially design the drilling track into an inclined hole with the angle larger than 3 degrees, so that the effective azimuth can be measured by the while-drilling instrument, and an original measuring system is used. Manually tilting the wellbore meets the measurement requirements, but increases drilling effort, which is detrimental to quality control. Also in some projects the wellbore trajectory needs to remain vertical, which makes current measurement systems impractical.
The magnetic joint used in the current active magnetic positioning technology is generally made of permanent magnetic materials and non-magnetic steel, the magnetic field emission source cannot be closed, the stratum containing ferromagnetic substances can be seriously magnetized when the stratum containing the ferromagnetic substances is met, and the track of a well hole is measured by a gravity sensor and a fluxgate sensor by the current common while-drilling instrument. The magnetized stratum greatly influences the fluxgate sensor, so that the track data generates larger deviation, and the later logging work is not facilitated.
Disclosure of Invention
The invention aims to provide a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, so as to solve the problems in the prior art, perform positioning measurement on a vertical or nearly vertical well hole, avoid magnetizing a stratum containing ferromagnetic substances and improve the accuracy of a measurement result.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a magnetic connector for magnetic positioning, which comprises a non-magnetic rigid body, wherein a plurality of diversion coils are fixedly wound on the periphery of the non-magnetic rigid body, the axes of the diversion coils are parallel to the axes of the non-magnetic rigid body, a cavity is arranged in the non-magnetic rigid body, a vibration sensor, a battery and a controller are fixedly arranged in the cavity, the vibration sensor and the diversion coils are electrically connected with the controller, and the battery is used for providing electric energy for the vibration sensor, the diversion coils and the controller.
Preferably, the nonmagnetic rigid body is a cylindrical body, and a through hole is axially formed in the nonmagnetic rigid body.
Preferably, the outer periphery of the nonmagnetic rigid body is provided with a groove, a plurality of guide coils are wound in the groove, the outer periphery of the guide coils is provided with a protective layer, and the outer diameter of the protective layer is equal to the outer diameter of the nonmagnetic rigid body.
Preferably, the chamber comprises a plurality of independent sub-chambers, each sub-chamber is hermetically arranged, and the vibration sensor, the battery and the controller are respectively arranged in the three independent sub-chambers.
Preferably, the two ends of the nonmagnetic rigid body are respectively provided with a pin and a box, and the pin and the box can be respectively connected with the drill collar and the drill bit.
Preferably, the protective layer is an adhesive layer, and the outer surface of the diversion coil is covered by the adhesive layer to protect the diversion coil.
The invention also provides a magnetic positioning system which comprises the magnetic connector and a probe tube, wherein the probe tube is used for measuring the magnetic field intensity generated by the diversion coil after the diversion coil is electrified in the well bore.
The invention also provides a magnetic positioning method based on the magnetic positioning system, which comprises the following steps:
s1: when the magnetic joint drills together with the drill bit, the vibration sensor monitors that the vibration parameter is higher than the set threshold S 0 Then, the controller controls the diversion coil to be powered off;
s2: drilling the drill bit to the depth D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor detects that the vibration parameter is lower than the set threshold S 1 After that, wherein S 1 ＜S 0 The controller controls the diversion coil to emit a periodic magnetic field signal, and captures the periodic signal emitted by the diversion coil by using the probe;
s4: when the probe captures a stable periodic signal, the probe records the total magnetic field intensity B of the diversion coil at the current position 1 ；
S5: controlling the drilling machine to continue drilling the drill bit position, and repeating the step S1;
s6: after the drill bit drills to the depth D2, repeating the step S3, and when the exploring tube captures a stable periodic signal, capturing the exploring tubeRecording the total magnetic field intensity B of the diversion coil at the current position 2 ；
S7: according to the space geometrical relationship between the guide coil and the probe tube, the following formula is obtained:
wherein, the liquid crystal display device comprises a liquid crystal display device,
B 1 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D1;
B 2 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D2;
s: the distance difference between the bit positions D1 and D2 is twice;
m: the magnetic moment value of the diversion coil is measured on the ground;
r: the magnetic axis of the diversion coil and the probe tube project a distance on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α 1 : when the drill bit is at the depth D1, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
α 2 : when the drill bit is at the depth D2, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
and solving the position information of the magnetic joint at the depths D1 and D2 relative to the probe according to the formula.
Preferably, in step S3, the vibration sensor detects thatThe vibration parameter is lower than the set threshold S 1 When the accumulated time reaches T1, the controller controls the flow guiding coil to be electrified, the electrifying duration time T2, then the controller controls the flow guiding coil to be electrified for the continuous power-off time T3, then the controller controls the flow guiding coil to be reversely electrified, the electrifying duration time T4, then the controller controls the flow guiding coil to be electrified for the continuous power-off time T5, and then the electrifying and power-off processes are circularly carried out to control the flow guiding coil to send out periodic magnetic field signals.
Preferably, after the controller starts timing until the accumulated timing time reaches T1, a probe is used to capture the periodic signal sent by the diversion coil.
Compared with the prior art, the invention has the following technical effects:
according to the magnetic joint, the magnetic positioning system and the magnetic positioning method for magnetic positioning, the controller is used for controlling the diversion coil to be powered off in the drilling process, a magnetic field is not generated, so that formation containing ferromagnetic substances is prevented from being magnetized, accuracy of a measurement result is improved, when the magnetic joint is drilled to a certain depth for positioning measurement, the magnetic joint stops drilling along with a drill bit, the controller is used for controlling the diversion coil to emit periodic magnetic field signals, a probe tube is used for capturing the periodic signals emitted by the diversion coil, position coordinates of the probe tube are known, when the probe tube captures a stable periodic signal, total magnetic field intensity of the diversion coil at the current position is recorded, then when the drill bit drills to a next depth for positioning measurement, the probe tube is used for capturing the stable periodic signal emitted by the diversion coil again, the total magnetic field intensity of the diversion coil at the position is recorded, and position information of the diversion coil at the upper position and the lower position is calculated according to the total magnetic field intensity of the diversion coil at the probe tube, so that position information of the magnetic joint relative to the probe tube is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a magnetic joint for magnetic positioning according to a first embodiment;
FIG. 2 is a schematic diagram of the magnetic positioning system according to the second embodiment;
FIG. 3 is a schematic diagram of the spatial geometry of the pilot coil and probe of FIG. 2;
FIG. 4 is a graph showing the relationship between the magnetic field strength of the diversion coil and the time variation in the magnetic positioning method according to the second embodiment;
in the figure: 100-magnetic joint for magnetic positioning, 1-nonmagnetic rigid body, 2-groove, 3-diversion coil, 4-chamber, 5-through hole, 6-protective layer, 7-male buckle, 8-female buckle and 9-probe tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, so as to solve the problems in the prior art, perform positioning measurement on a vertical or nearly vertical well hole, avoid magnetizing a stratum containing ferromagnetic substances and improve the accuracy of a measurement result.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, this embodiment provides a magnetic joint 100 for magnetic positioning, including non-magnetic rigid body, the fixed winding in non-magnetic rigid body 1 periphery has a plurality of water conservancy diversion coils 3, and the axis of water conservancy diversion coil 3 is parallel with the axis of non-magnetic rigid body 1, is equipped with cavity 4 in non-magnetic rigid body 1, and cavity 4 internal fixation is equipped with vibration sensor, battery and controller, and vibration sensor and water conservancy diversion coil 3 all are with the controller electric connection, and the battery is used for providing the electric energy for vibration sensor, water conservancy diversion coil 3 and controller.
In the drilling process, according to the vibration condition monitored by a vibration sensor, the diversion coil 3 is controlled to be powered off by a controller, a magnetic field is not generated, so that formation magnetization containing ferromagnetic substances is avoided, accuracy of a measurement result is improved, when the magnetic joint is positioned and measured at a certain drilling depth, the magnetic joint stops drilling along with a drill bit, the controller controls the diversion coil 3 to emit periodic magnetic field signals, the probe 9 is used for capturing the periodic signals emitted by the diversion coil 3, when the probe 9 captures stable periodic signals, the total magnetic field intensity of the diversion coil 3 at the current position is recorded, after the drill bit stops drilling when the drill bit is positioned and measured at the next depth position, the probe 9 is used for capturing the periodic signals emitted by the diversion coil 3 again, the total magnetic field intensity of the diversion coil 3 at the position is recorded, and according to the spatial geometrical relation between the magnetic joint and the probe 9, so that position information of the magnetic joint is obtained is calculated. For positioning measurement of wellbores with well deviation greater than 3 degrees, the magnetic joint 100 for magnetic positioning provided by the invention can be used for a wide application range.
In this embodiment, the nonmagnetic rigid body 1 is a cylindrical body, the nonmagnetic rigid body 1 is axially provided with a through hole 5, and the nonmagnetic rigid body 1 is arranged as a cylindrical body, so that the production is more convenient, and the through hole 5 is arranged, so that after the magnetic joint is connected with the drill bit, drilling fluid can flow to the drill bit through the through hole 5 and flow into the drill bit from the drill bit, and the drilling of the drill bit is convenient.
In this embodiment, the outer periphery of the nonmagnetic rigid body 1 is provided with a groove 2, a plurality of guide coils 3 are wound in the groove 2, the outer periphery of the guide coils 3 is provided with a protection layer 6, the outer diameter of the protection layer 6 is equal to that of the nonmagnetic rigid body 1, the groove 2 is manufactured on the outer periphery of the cylindrical body so as to wind the guide coils 3 in the groove 2, and the guide coils 3 are protected by the protection layer 6, and the outer diameter of the protection layer 6 is equal to that of the nonmagnetic rigid body 1, so that the protection layer cannot be damaged in the drilling process due to protruding out of the nonmagnetic rigid body 1.
In this embodiment, cavity 4 includes a plurality of independent minute cavities, and each minute cavity is all sealed to be set up, and vibration sensor, battery and controller set up respectively in three independent minute cavities, avoid drilling fluid to enter into each minute cavity in, protect vibration sensor, battery and controller, and vibration sensor, battery and controller set up respectively in three independent minute cavities, can reduce each other's influence.
In this embodiment, the two ends of the nonmagnetic rigid body 1 are respectively provided with a pin buckle 7 and a box buckle 8, the pin buckle 7 and the box buckle 8 can be respectively used for being connected with a drill collar and a drill bit or connected with other drilling machine mechanisms, wherein the drill collar is a nonmagnetic drill collar, and the connection is stable and the disassembly and the assembly are convenient and quick.
In this embodiment, protective layer 6 is the glue film, covers in water conservancy diversion coil 3 surface through the glue film and protects water conservancy diversion coil 3, and high cohesive force through the glue film bonds water conservancy diversion coil 3 to be fixed in recess 2, and the structure is more stable, and is more convenient during the preparation.
Example two
As shown in fig. 2 to 4, the present embodiment provides a magnetic positioning system, which includes the magnetic joint and the probe tube 9 in the first embodiment, and the probe tube 9 is used for measuring the magnetic field strength generated by the diversion coil 3 after the diversion coil is electrified in the borehole.
In the drilling process, according to the vibration condition monitored by the vibration sensor, the controller controls the diversion coil 3 to be powered off, and a magnetic field is not generated, so that stratum containing ferromagnetic substances is prevented from being magnetized, and the accuracy of a measurement result is improved. In fig. 2, when positioning measurement is performed on the well, the probe tube 9 is preset in the completed well, the position coordinates of the probe tube 9 are known, the magnetic field intensity generated after the flow guiding coil 3 is electrified at different depth positions in the well hole is measured through the probe tube 9, and then the position information of the magnetic joint relative to the probe tube 9 is calculated according to the space geometrical relationship between the magnetic joint and the probe tube 9.
A magnetic positioning method based on the magnetic positioning system, comprising the following steps:
s1: when the magnetic joint drills together with the drill bit, the vibration sensor monitors that the vibration parameter is higher than the set threshold S 0 Then, the controller controls the diversion coil 3 to be powered off;
s2: drilling the drill bit to the depth D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor detects that the vibration parameter is lower than the set threshold S 1 After that, wherein S 1 ＜S 0 The controller controls the diversion coil 3 to emit a periodic magnetic field signal, and captures the periodic signal emitted by the diversion coil 3 by using the probe 9;
s4: when the probe tube 9 captures a stable periodic signal, the probe tube 9 records the total magnetic field intensity B of the current position diversion coil 3 1 ；
S5: controlling the drilling machine to continue drilling the drill bit position, and repeating the step S1;
s6: after the drill bit drills to the depth D2, the step S3 is repeated, and when the probe tube 9 captures a stable periodic signal, the probe tube 9 records the total magnetic field intensity B of the current position diversion coil 3 2 ；
S7: according to the space geometrical relationship between the guide coil 3 and the probe tube 9, the following formula is obtained:
wherein, the liquid crystal display device comprises a liquid crystal display device,
B 1 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D1;
B 2 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D2;
s: the distance difference between the bit positions D1 and D2 is twice;
m: the magnetic moment value of the diversion coil is measured on the ground;
r: the magnetic axis of the diversion coil and the probe tube project a distance on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α 1 : when the drill bit is at the depth D1, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
α 2 : when the drill bit is at the depth D2, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
and solving the position information of the magnetic joint at the depths D1 and D2 relative to the probe according to the formula.
In the drilling process, according to the vibration condition monitored by a vibration sensor, the diversion coil 3 is controlled to be powered off by a controller, a magnetic field is not generated, so that formation magnetization containing ferromagnetic substances is avoided, accuracy of a measurement result is improved, when the magnetic joint is positioned and measured at a certain drilling depth, the magnetic joint stops drilling along with a drill bit, the controller controls the diversion coil 3 to emit periodic magnetic field signals, the probe 9 is used for capturing the periodic signals emitted by the diversion coil 3, when the probe 9 captures stable periodic signals, the total magnetic field intensity of the diversion coil 3 at the current position is recorded, after the drill bit stops drilling when the drill bit is positioned and measured at the next depth position, the probe 9 is used for capturing the periodic signals emitted by the diversion coil 3 again, the total magnetic field intensity of the diversion coil 3 at the position is recorded, and according to the spatial geometrical relation between the magnetic joint and the probe 9, so that position information of the magnetic joint is obtained is calculated. For positioning measurement of wellbores with well deviation greater than 3 degrees, the magnetic joint 100 for magnetic positioning provided by the invention can be used for a wide application range.
As shown in fig. 4, in step S3, the vibration sensor detects that the vibration parameter is lower than the set threshold S 1 When the accumulated time reaches T1, the controller controls the current guiding coil 3 to be electrified, the electrifying duration T2, then the controller controls the current guiding coil 3 to be electrified, the electrifying duration T3 is continuous, then the controller controls the current guiding coil 3 to be electrified reversely, the electrifying duration T4, then the controller controls the current guiding coil 3 to be electrified, the electrifying duration T5 is continuous, and then the electrifying and the electrifying processes are circularly carried out to control the current guiding coil 3 to send out periodic magnetic field signals. The guide coil 3 is electrified positively and negatively, and the magnetic field strength can change along with the positive and negative electrifying mode, so that the probe tube can capture magnetic field signals more easily, accidental errors can be eliminated in the measuring process because the magnetic field signals are in different positive and negative directions, and the measuring result is more accurate.
After the controller starts timing until the accumulated timing time reaches T1, the probe 9 is used to capture the periodic signal emitted from the pilot coil 3. After the vibration sensor monitors that the vibration parameter is lower than the set threshold S1, after the accumulated time is counted for a period of time, vibration of the magnetic joint is further reduced, the influence of vibration of the magnetic joint on measurement is avoided, and therefore accuracy of measurement results is improved.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (3)
1. A magnetic positioning method, comprising the steps of:
s1: when the magnetic joint drills together with the drill bit, the vibration sensor monitors that the vibration parameter is higher than the set threshold S 0 Then, the controller controls the diversion coil to be powered off;
s2: drilling the drill bit to the depth D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor detects that the vibration parameter is lower than the set threshold S 1 After that, wherein S 1 ＜S 0 The controller controls the diversion coil to emit a periodic magnetic field signal, and captures the periodic signal emitted by the diversion coil by using a probe;
s4: when the probe captures a stable periodic signal, the probe records the total magnetic field intensity B of the diversion coil at the current position 1 ；
S5: controlling the drilling machine to continue drilling the drill bit position, and repeating the step S1;
s6: after the drill bit drills to the depth D2, repeating the step S3, and recording the total magnetic field intensity B of the diversion coil at the current position by the probe tube when the probe tube captures a stable periodic signal 2 ；
S7: according to the space geometrical relationship between the guide coil and the probe tube, the following formula is obtained:
wherein, the liquid crystal display device comprises a liquid crystal display device,
B 1 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D1;
B 2 : the total magnetic field intensity measured by the probe tube when the drill bit is at the depth D2;
s: the distance difference between the bit positions D1 and D2 is twice;
m: the magnetic moment value of the diversion coil is measured on the ground;
r: the magnetic axis of the diversion coil and the probe tube project a distance on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α 1 : when the drill bit is at the depth D1, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
α 2 : when the drill bit is at the depth D2, the magnetic axis of the diversion coil forms an included angle with the connection line of the diversion coil and the probe tube;
and solving the position information of the magnetic joint at the depths D1 and D2 relative to the probe according to the formula.
2. The magnetic positioning method according to claim 1, wherein: in step S3, the vibration sensor detects that the vibration parameter is lower than a set threshold S 1 When the accumulated time reaches T1, the controller controls the flow guiding coil to be electrified, the electrifying duration time T2, then the controller controls the flow guiding coil to be electrified for the continuous power-off time T3, then the controller controls the flow guiding coil to be reversely electrified, the electrifying duration time T4, then the controller controls the flow guiding coil to be electrified for the continuous power-off time T5, and then the electrifying and power-off processes are circularly carried out to control the flow guiding coil to send out periodic magnetic field signals.
3. A magnetic positioning method according to claim 2, characterized in that: and after the controller starts timing until the accumulated timing time reaches T1, capturing a periodic signal sent by the diversion coil by using a probe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101713286B (en) * | 2009-11-04 | 2013-05-01 | 中国石油大学(北京) | Electromagnetic system for detecting distance between adjacent wells while drilling |
| CN101799558B (en) * | 2010-03-19 | 2012-08-29 | 中国石油大学(北京) | Electromagnetic surveying system while drilling of adjacent-well parallel intervals |
| CN102052069A (en) * | 2010-11-22 | 2011-05-11 | 中联煤层气国家工程研究中心有限责任公司 | Near-bit measurement while drilling (MWD) system and method |
| CN202031580U (en) * | 2011-04-02 | 2011-11-09 | 北京工业大学 | Active magnetic field calibrator with MWD (measurement while drilling) directional probe |
| CN105649613A (en) * | 2016-01-05 | 2016-06-08 | 西南石油大学 | Reverse magnetic moment compensation magnetic field while-drilling rotating ranging device and ranging anti-collision method |
| CN106194159B (en) * | 2016-08-30 | 2023-02-28 | 安徽惠洲地质安全研究院股份有限公司 | Mine inclination measurement while drilling exploration system and measuring method thereof |
| CN106907142B (en) * | 2017-01-20 | 2018-07-17 | 中国科学院地质与地球物理研究所 | A kind of nearly bit orientation dynamic measurement device and measurement method |
| CN110984958B (en) * | 2019-12-12 | 2023-04-18 | 商丘睿控仪器仪表有限公司 | Small-size drilling engineering monitored control system |
| CN111691870B (en) * | 2020-05-26 | 2023-05-16 | 中国地质科学院勘探技术研究所 | Magnetic field controllable drill bit magnetic joint and use method thereof |
| CN115680492A (en) * | 2021-07-27 | 2023-02-03 | 中石化石油工程技术服务有限公司 | Casing pipe internal magnetization method for adjacent well passive magnetic positioning |
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