CN113669051A - 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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- CN113669051A CN113669051A CN202111001136.0A CN202111001136A CN113669051A CN 113669051 A CN113669051 A CN 113669051A CN 202111001136 A CN202111001136 A CN 202111001136A CN 113669051 A CN113669051 A CN 113669051A
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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, and relates to the technical field of drilling measurement. The magnetic joint, the magnetic positioning system and the magnetic positioning method for magnetic positioning provided by the invention can be used for positioning and measuring a vertical or nearly vertical well hole, can avoid magnetizing a stratum containing ferromagnetic substances, and improve the accuracy of a measurement result.
Description
Technical Field
The invention relates to the technical field of drilling measurement, in particular to a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning.
Background
In the field of drilling measurement, an active magnetic positioning technology is provided, 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 attitude is used as a signal source, a probe is used as a signal receiving source, and the relative space position relation between the magnetic joint and the signal receiving source is calculated by analyzing an alternating current magnetic field. The magnetic moment, namely the magnetic field intensity 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 the well deviation and the direction of a rotating shaft of the magnetic joint and is measured by a drilling tool during construction. Two attitude parameters of the magnetic joint are basic data of the whole calculation, and the two attitude parameters are not usable. However, when the well inclination of the magnetic joint is within 3 degrees, that is, the rotating shaft of the magnetic joint is perpendicular or nearly perpendicular to the horizontal plane, the projection of the magnetic joint on the horizontal plane is not a line but a point, and there is no direction, that is, there is no azimuth value, and the current positioning technology cannot be normally analyzed under such a condition. At present, the common method is to artificially design a drilling track into an inclined hole with the angle of more than 3 degrees, so that the drilling tool can measure the effective direction and use the original measuring system. Artificially inclining the borehole meets the measurement requirements, but increases the drilling workload and is not beneficial to quality control. Also, in some projects, the borehole trajectory is required to remain vertical, which makes current measurement systems impractical.
The magnetic joint used by the existing active magnetic positioning technology is generally made of permanent magnetic materials and non-magnetic steel, a magnetic field emission source cannot be closed, a stratum containing ferromagnetic substances can be seriously magnetized in a stratum containing the ferromagnetic substances, and the track of a well hole is measured by a gravity sensor and a fluxgate sensor through a common drilling instrument at present. The magnetized stratum can greatly influence the fluxgate sensor, so that the trajectory data has larger deviation and is not beneficial to the subsequent logging work.
Disclosure of Invention
The invention aims to provide a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, which are used for solving the problems in the prior art, can perform positioning measurement on a vertical or near-vertical well hole, can avoid magnetizing a stratum containing ferromagnetic substances and improve the accuracy of a measurement result.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a magnetic joint for magnetic positioning, which comprises a non-magnetic rigid body, wherein a plurality of flow guide coils are fixedly wound on the periphery of the non-magnetic rigid body, the axis of each flow guide coil is parallel to the axis 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 flow guide coils are electrically connected with the controller, and the battery is used for providing electric energy for the vibration sensor, the flow guide coils and the controller.
Preferably, the non-magnetic rigid body is a cylindrical body, and a through hole is axially formed in the non-magnetic rigid body.
Preferably, the periphery of the non-magnetic rigid body is provided with a groove, the plurality of diversion coils are wound in the groove, the periphery of the diversion coils is provided with a protective layer, and the outer diameter of the protective layer is equal to that of the non-magnetic rigid body.
Preferably, the chamber includes a plurality of independent sub-chambers, each of the sub-chambers is hermetically disposed, and the vibration sensor, the battery, and the controller are respectively disposed in three independent sub-chambers.
Preferably, a male buckle and a female buckle are respectively arranged at two ends of the non-magnetic rigid body, and the male buckle and the female buckle can be respectively used for being connected with the drill collar and the drill bit.
Preferably, the protective layer is a glue layer, and the outer surface of the flow guide coil is covered with the glue layer to protect the flow guide coil.
The invention also provides a magnetic positioning system which comprises the magnetic joint and the probe tube, wherein the probe tube is used for measuring the magnetic field intensity generated after the diversion coil is electrified in the borehole.
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 along with the drill bit, the vibration sensor monitors that the vibration parameter is higher than a set threshold value S0Then, the controller controls the current-guiding coil to be powered off;
s2: the drill bit drilled to a depth of D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor monitors that the vibration parameter is lower than a set threshold S1Then, wherein S1＜S0The controller controls the flow guide coil to send out periodic magnetic field signals, and the probe is used for capturing the periodic signals sent out by the flow guide coil;
s4: when the probe tube captures a stable periodic signal, the probe tube records the total magnetic field intensity B of the current position of the flow guide coil1；
S5: controlling the drilling machine to continuously drill the drill bit position, and repeating the step S1;
s6: repeating the step S3 after the drill bit drills to the depth D2, and when the probe catches a stable periodic signal, the probe records the current position and the total magnetic field intensity B of the flow guide coil2；
S7: according to the space geometric relationship between the flow guide coil and the probe tube, the following formula is obtained:
wherein the content of the first and second substances,
B1: total magnetic field strength measured by the probe at depth D1;
B2: total magnetic field strength measured by the probe at depth D2;
s: the distance difference between the two drill bit positions D1 and D2;
m: measuring the magnetic moment value of the flow guiding coil on the ground;
r: the projection distance of the magnetic axis of the flow guiding coil and the probe tube on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α1: when the drill bit is at the depth D1, the included angle between the magnetic axis of the flow guide coil and the connecting line of the flow guide coil and the probe tube is formed;
α2: when the drill bit is at the depth D2, the included angle between the magnetic axis of the flow guide coil and the connecting line of the flow guide coil and the probe tube is formed;
the position information of the magnetic joint at the depths of D1 and D2 relative to the probe is solved according to the formula.
Preferably, in step S3, the vibration sensor monitors that the vibration parameter is lower than the set threshold S1When the accumulated time reaches T1, the controller controls the current-guiding coil to be electrified for a duration time T2, then the controller controls the current-guiding coil to be powered off for a duration time T3, then the controller controls the current-guiding coil to be reversely electrified for a duration time T4, then the controller controls the current-guiding coil to be powered off for a duration time T5, and then the processes of powering on and powering off are circularly carried out to control the current-guiding coil to send out periodic magnetic field signals.
Preferably, after the controller starts to count until the accumulated counting time reaches T1, a probe tube is used to capture the periodic signal emitted by the flow guiding coil.
Compared with the prior art, the invention has the following technical effects:
the invention provides a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, wherein in the drilling process, a controller controls a flow guide coil to be powered off, a magnetic field cannot be generated, thereby avoiding magnetizing a stratum containing ferromagnetic substances, improving the accuracy of a measurement result, when the magnetic joint is positioned and measured at a certain depth, the magnetic joint stops drilling along with a drill bit, the controller controls the flow guide coil to send a periodic magnetic field signal, a probe tube is used for capturing the periodic signal sent by the flow guide coil, the position coordinate of the probe tube is known, when the probe tube captures a stable periodic signal, the total magnetic field intensity of the current position flow guide coil is recorded, then when the drill bit drills to the next depth position for positioning and measurement, after the drill bit stops drilling, the probe tube is used for capturing the stable periodic signal sent by the flow guide coil again, and the total magnetic field intensity of the flow guide coil at the position is recorded, compared with the traditional positioning measurement method, the method does not need the azimuth value of the magnetic joint in the measurement process, and is suitable for positioning measurement of a vertical or nearly vertical well hole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a magnetic joint for magnetic positioning in accordance with a first embodiment;
FIG. 2 is a schematic diagram of a magnetic positioning system according to a second embodiment;
FIG. 3 is a schematic view of the spatial geometry of the flow guiding coil and the probe tube in FIG. 2;
FIG. 4 is a graph showing the time-dependent variation of the magnetic field strength of the guidance coils in the magnetic positioning method according to the second embodiment;
in the figure: 100-magnetic joint for magnetic positioning, 1-non-magnetic rigid body, 2-groove, 3-flow guiding coil, 4-chamber, 5-through hole, 6-protective layer, 7-male buckle, 8-female buckle and 9-probe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a magnetic joint, a magnetic positioning system and a magnetic positioning method for magnetic positioning, which are used for solving the problems in the prior art, can perform positioning measurement on a vertical or near-vertical well hole, can avoid magnetizing a stratum containing ferromagnetic substances and improve the accuracy of a measurement result.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1, the present embodiment provides a magnetic joint 100 for magnetic positioning, which includes a non-magnetic rigid body, a plurality of current-guiding coils 3 are fixedly wound around the periphery of the non-magnetic rigid body 1, the axes of the current-guiding coils 3 are parallel to the axis of the non-magnetic rigid body 1, a chamber 4 is disposed in the non-magnetic rigid body 1, a vibration sensor, a battery and a controller are fixedly disposed in the chamber 4, the vibration sensor and the current-guiding coils 3 are electrically connected to the controller, and the battery is used for providing electric energy for the vibration sensor, the current-guiding coils 3 and the controller.
During the drilling process, according to the vibration condition monitored by the vibration sensor, the controller controls the current-guiding coil 3 to be powered off, and a magnetic field cannot be generated, so that the stratum containing ferromagnetic substances is prevented from being magnetized, the accuracy of the measurement result is improved, when the magnetic joint is positioned and measured in a certain depth during drilling, the magnetic joint stops drilling along with the drill bit, the controller controls the current-guiding coil 3 to send a periodic magnetic field signal, the probe tube 9 is used for capturing the periodic signal sent by the current-guiding coil 3, when the probe tube 9 captures a stable periodic signal, the total magnetic field intensity of the current-guiding coil 3 is recorded, then when the drill bit drills to the next depth position for positioning and measurement, after the drill bit stops drilling, the probe tube 9 is used for capturing the periodic signal sent by the current-guiding coil 3 again, the total magnetic field intensity of the current-guiding coil 3 at the position is recorded, and the total magnetic field intensity of the current-guiding coil 3 at the upper and the lower positions is measured according to the probe tube 9, and the space geometric relation between the magnetic joint and the probe 9, so that the position information of the magnetic joint is obtained through calculation. For the positioning measurement of the well bore with the well deviation larger than 3 degrees, the magnetic joint 100 for magnetic positioning provided by the invention can also be adopted, and the application range is wide.
In this embodiment, no magnetism rigid body 1 is the cylindrical body, and 1 axial of no magnetism rigid body is equipped with through-hole 5, sets up to the cylindrical body, and it is more convenient to make, and the setting of through-hole 5 makes the magnetism connect and links to each other the back with the drill bit, and drilling fluid accessible through-hole 5 flow direction drill bit to flow in from the drill bit, the drilling of the drill bit of being convenient for.
In this embodiment, the outer periphery of the non-magnetic rigid body 1 is provided with the groove 2, the plurality of guiding coils 3 are wound in the groove 2, the outer periphery of the guiding coils 3 is provided with the protective layer 6, the outer diameter of the protective layer 6 is equal to the outer diameter of the non-magnetic rigid body 1, the groove 2 is manufactured on the outer peripheral surface of the cylindrical body so that the guiding coils 3 are wound in the groove 2, the guiding coils 3 are protected by the protective layer 6, the outer diameter of the protective layer 6 is equal to the outer diameter of the non-magnetic rigid body 1, and the protective layer is prevented from being damaged in the drilling process due to protruding out of the non-magnetic rigid body 1.
In this embodiment, cavity 4 includes a plurality of independent minute cavities, and each divides the cavity all sealed setting, and vibration sensor, battery and controller set up respectively in independent three minute cavity, avoids in drilling fluid enters into each minute cavity, protects vibration sensor, battery and controller, and vibration sensor, battery and controller set up respectively in independent three minute cavity, can reduce the influence each other.
In this embodiment, the two ends of the non-magnetic rigid body 1 are respectively provided with a male buckle 7 and a female buckle 8, and the male buckle 7 and the female buckle 8 can be respectively used for being connected with a drill collar and a drill bit or being connected with other drilling machine mechanisms, wherein the drill collar is a non-magnetic drill collar, so that the connection is stable, and the disassembly and the assembly are convenient and rapid.
In this embodiment, protective layer 6 is the glue film, covers in 3 surfaces of water conservancy diversion coil through the glue film and protects water conservancy diversion coil 3, and high adhesion through the glue film is fixed in recess 2 with water conservancy diversion coil 3 bonding, 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 of the first embodiment and a probe 9, where the probe 9 is used to measure the magnetic field intensity generated by the current-guiding coil 3 after being energized in the borehole.
In the drilling process, the controller controls the power-off of the flow guide coil 3 according to the vibration condition monitored by the vibration sensor, so that a magnetic field cannot be generated, the stratum containing ferromagnetic substances is prevented from being magnetized, and the accuracy of a measuring result is improved. In fig. 2, when positioning measurement is performed on a well being drilled, the probe 9 is preset in the completed well, the position coordinate of the probe 9 is known, the magnetic field intensity generated after the current-conducting coil 3 is electrified at different depth positions in the well bore is measured through the probe 9, and further the position information of the magnetic joint relative to the probe 9 is calculated according to the space geometric relationship between the magnetic joint and the probe 9.
A magnetic positioning method based on the above magnetic positioning system, comprising the steps of:
s1: when the magnetic joint drills along with the drill bit, the vibration parameter monitored by the vibration sensor is higher than a set threshold value S0Then, the controller controls the current guiding coil 3 to be powered off;
s2: the drill bit drilled to a depth of D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor monitors that the vibration parameter is lower than a set threshold S1Then, wherein S1＜S0The controller controls the flow guiding coil 3 to send out periodic magnetic field signals, and captures the periodic signals sent out by the flow guiding coil 3 by using the probe tube 9;
s4: when the probe tube 9 catches the stable periodic signal, the probe tube 9 records the total magnetic field intensity B of the current position flow guide coil 31；
S5: controlling the drilling machine to continuously drill the drill bit position, and repeating the step S1;
s6: after the drill bit drills to the depth D2, the step S3 is repeated, when the probe tube 9 catches the stable periodic signal, the probe tube 9 records the total magnetic field intensity B of the current position guide coil 32；
S7: according to the space geometric relationship between the flow guiding coil 3 and the probe tube 9, the following formula is obtained:
wherein the content of the first and second substances,
B1: total magnetic field strength measured by the probe at depth D1;
B2: total magnetic field strength measured by the probe at depth D2;
s: the distance difference between the two drill bit positions D1 and D2;
m: measuring the magnetic moment value of the flow guiding coil on the ground;
r: the projection distance of the magnetic axis of the flow guiding coil and the probe tube on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α1: when the drill bit is at the depth D1, the magnetic axis of the guide coil, the guide coil and the probe tubeThe included angle of the connecting line;
α2: when the drill bit is at the depth D2, the included angle between the magnetic axis of the flow guide coil and the connecting line of the flow guide coil and the probe tube is formed;
the position information of the magnetic joint at the depths of D1 and D2 relative to the probe is solved according to the formula.
During the drilling process, according to the vibration condition monitored by the vibration sensor, the controller controls the current-guiding coil 3 to be powered off, and a magnetic field cannot be generated, so that the stratum containing ferromagnetic substances is prevented from being magnetized, the accuracy of the measurement result is improved, when the magnetic joint is positioned and measured in a certain depth during drilling, the magnetic joint stops drilling along with the drill bit, the controller controls the current-guiding coil 3 to send a periodic magnetic field signal, the probe tube 9 is used for capturing the periodic signal sent by the current-guiding coil 3, when the probe tube 9 captures a stable periodic signal, the total magnetic field intensity of the current-guiding coil 3 is recorded, then when the drill bit drills to the next depth position for positioning and measurement, after the drill bit stops drilling, the probe tube 9 is used for capturing the periodic signal sent by the current-guiding coil 3 again, the total magnetic field intensity of the current-guiding coil 3 at the position is recorded, and the total magnetic field intensity of the current-guiding coil 3 at the upper and the lower positions is measured according to the probe tube 9, and the space geometric relation between the magnetic joint and the probe 9, so that the position information of the magnetic joint is obtained through calculation. For the positioning measurement of the well bore with the well deviation larger than 3 degrees, the magnetic joint 100 for magnetic positioning provided by the invention can also be adopted, and the application range is wide.
As shown in fig. 4, in step S3, the vibration sensor detects that the vibration parameter is lower than the set threshold S1When the time is up, the controller starts timing, when the accumulated time reaches T1, the controller controls the current-conducting coil 3 to be powered on for a duration time T2, then the controller controls the current-conducting coil 3 to be powered off for a duration time T3, then the controller controls the current-conducting coil 3 to be powered on reversely for a duration time T4, then the controller controls the current-conducting coil 3 to be powered off for a duration time T5, and then the power-on and power-off processes are carried out in a circulating mode to control the current-conducting coil 3 to send out a periodic magnetic fieldA signal. Adopt positive and negative circular telegram mode to water conservancy diversion coil 3, magnetic field intensity also can produce the direction change thereupon to make the probe can catch the magnetic field signal more easily, because of the magnetic field signal of positive and negative not equidirectional, can eliminate accidental error in the measurement process, make measuring result more accurate.
After the controller starts to count until the accumulated timing time reaches T1, the probe 9 is used to capture the periodic signal emitted by the guidance coil 3. After the vibration sensor monitors that the vibration parameter is lower than the set threshold value S1, after a period of time is accumulated and timed, the vibration of the magnetic joint is further reduced, the influence of the vibration of the magnetic joint on measurement is avoided, and the accuracy of the measurement result is improved.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A magnetic coupling for use in magnetic positioning, comprising: including no magnetism rigid body, the fixed winding in no magnetism rigid body periphery has a plurality of water conservancy diversion coils, water conservancy diversion coil's axis with the axis of no magnetism rigid body is parallel, be equipped with the cavity in the no magnetism rigid body, the cavity internal fixation is equipped with vibration sensor, battery and controller, vibration sensor with water conservancy diversion coil all with the controller electric connection, the battery be used for doing vibration sensor water conservancy diversion coil with the controller provides the electric energy.
2. A magnetic joint according to claim 1, wherein: the non-magnetic rigid body is a cylindrical body, and a through hole is axially formed in the non-magnetic rigid body.
3. A magnetic joint according to claim 2, wherein: the periphery of the non-magnetic rigid body is provided with a groove, the plurality of diversion coils are wound in the groove, the periphery of each diversion coil is provided with a protective layer, and the outer diameter of each protective layer is equal to that of the non-magnetic rigid body.
4. A magnetic joint according to claim 1, wherein: 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 three independent sub-chambers.
5. A magnetic joint according to claim 1, wherein: and a male buckle and a female buckle are respectively arranged at two ends of the non-magnetic rigid body and can be respectively used for being connected with the drill collar and the drill bit.
6. A magnetic joint according to claim 3, wherein: the protective layer is a glue layer, and the outer surface of the flow guide coil is covered with the glue layer to protect the flow guide coil.
7. A magnetic positioning system, characterized by: the magnetic joint comprises the magnetic joint as claimed in any one of claims 1-6 and a probe tube, wherein the probe tube is used for measuring the magnetic field intensity generated by the diversion coil after being electrified in a borehole.
8. A magnetic positioning method based on the magnetic positioning system of claim 7, characterized by comprising the steps of:
s1: when the magnetic joint drills along with the drill bit, the vibration sensor monitors that the vibration parameter is higher than a set threshold value S0Then, the controller controls the current-guiding coil to be powered off;
s2: the drill bit drilled to a depth of D1;
s3: the magnetic joint stops drilling along with the drill bit, and the vibration sensor monitors that the vibration parameter is lower than a set threshold S1Then, wherein S1＜S0The controller controls the emission period of the current guiding coilA magnetic field signal, and capturing a periodic signal emitted by the flow guiding coil by using the probe;
s4: when the probe tube captures a stable periodic signal, the probe tube records the total magnetic field intensity B of the current position of the flow guide coil1；
S5: controlling the drilling machine to continuously drill the drill bit position, and repeating the step S1;
s6: repeating the step S3 after the drill bit drills to the depth D2, and when the probe catches a stable periodic signal, the probe records the current position and the total magnetic field intensity B of the flow guide coil2；
S7: according to the space geometric relationship between the flow guide coil and the probe tube, the following formula is obtained:
wherein the content of the first and second substances,
B1: total magnetic field strength measured by the probe at depth D1;
B2: total magnetic field strength measured by the probe at depth D2;
s: the distance difference between the two drill bit positions D1 and D2;
m: measuring the magnetic moment value of the flow guiding coil on the ground;
r: the projection distance of the magnetic axis of the flow guiding coil and the probe tube on the horizontal plane;
l: the vertical distance between the magnetic axis of the diversion coil and the probe tube;
α1: when the drill bit is at the depth D1, the included angle between the magnetic axis of the flow guide coil and the connecting line of the flow guide coil and the probe tube is formed;
α2: when the drill bit is at the depth D2, the included angle between the magnetic axis of the flow guide coil and the connecting line of the flow guide coil and the probe tube is formed;
the position information of the magnetic joint at the depths of D1 and D2 relative to the probe is solved according to the formula.
9. A magnetic positioning method according to claim 8, characterized in that: in step S3, the vibration sensor monitors that the vibration parameter is lower than a set threshold S1When the accumulated time reaches T1, the controller controls the current-guiding coil to be electrified for a duration time T2, then the controller controls the current-guiding coil to be powered off for a duration time T3, then the controller controls the current-guiding coil to be reversely electrified for a duration time T4, then the controller controls the current-guiding coil to be powered off for a duration time T5, and then the processes of powering on and powering off are circularly carried out to control the current-guiding coil to send out periodic magnetic field signals.
10. A magnetic positioning method according to claim 9, characterized in that: and after the controller starts to count until the accumulated timing time reaches T1, capturing a periodic signal sent by the flow guiding coil by using a probe.
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| 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 |
| CN106194159A (en) * | 2016-08-30 | 2016-12-07 | 安徽惠洲地质安全研究院股份有限公司 | A kind of mine is with boring deviational survey exploration system and measuring method thereof |
| CN106907142A (en) * | 2017-01-20 | 2017-06-30 | 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 measuring method |
| CN110984958A (en) * | 2019-12-12 | 2020-04-10 | 商丘睿控仪器仪表有限公司 | Small-size drilling engineering monitored control system |
| CN111691870A (en) * | 2020-05-26 | 2020-09-22 | 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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