A pressure-coupling detection system for drilling sites

Abstract

The present invention belongs to the technical field of drilling engineering, and discloses a detection system with crimping collar for drilling sites, which includes an isolation ring and an annular magnetic conductive ring located outside the isolation ring; a number of electromagnetic coils are installed between the isolation ring and the annular magnetic conductive ring, and each electromagnetic coil is arranged at equal intervals along the outer edge of the isolation ring, and each electromagnetic coil is installed with a sensor at one end close to the isolation ring; a signal detection system is electrically connected to each sensor, and the signal detection system includes a communication module, and the signal detection system is connected to a host computer through the communication module; a DC power supply module is electrically connected to the signal detection system and each of the sensors, and an electromagnetic coil power supply module is electrically connected to each of the electromagnetic coils. The technical solution of the present invention can eliminate the influence of mud and sand carried by the drill pipe during the lifting process on the detection system, and eliminate the errors occurring during the transmission process, so that the system application is more stable and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling engineering, and in particular relates to a pressure-connected collar detection system for drilling sites. Background Art

[0002] The oil and gas drilling process is an important part of the oil and gas development process. The process of the drill pipe entering and exiting the wellhead during the drilling process directly reflects the normal progress of the drilling process. The oil pipe coupling detection device is mainly composed of a base, a sealing ring, a pressure equalizing hole, a detection plunger, a driving cylinder, an oil pipe coupling, a proximity switch, a detection sensor and other parts. When the fluid pressure in the well is balanced, the hydraulic control device will control the coupling device to be in the coupling state. The pressure coupling detection device is in the detection process. During the process of lifting / lowering the tubing under pressure, the uniform section of the tubing moves in the coupling detection device, and the coupling detection sensor detects a uniform and small movement signal, so the signal sent by the detection device to the host computer is a normal movement signal. The host computer controls the slip oil pressure switch control process as an open process, and the drill pipe can move up and down normally; the tubing coupling moves to the coupling detection point, because the outer diameter of the tubing coupling exceeds the outer diameter of the normal tubing, the coupling will change the signal detected by the coupling detection sensor during the coupling detection process, and the signal is sent to the host computer using serial data RS-485, which sends an audible and visual alarm and generates a control signal for the gate blowout preventer to ensure that the sealing pair is opened when the pressure is balanced, so that the tubing coupling can pass normally. At the same time, the host computer controls the hydraulic control system of the slip to control the slip and complete the normal take-over or unloading control.

[0003] During field operations, if the downhole tool has a large diameter (packer, etc.) and needs to pass through the blowout preventer, the coupling detection will cause obstruction, making it impossible to carry out field operations. According to actual requirements, the device selects hydraulic drive control, and the drive hydraulic cylinder is installed at the tail. During the tubing coupling detection process, a command is issued to the drive cylinder to extend it, thereby completing the tubing coupling detection work. If the downhole tool needs to pass, a command is issued to the drive cylinder to retract it, providing a passage for the downhole tool, so that it can pass normally and avoid adverse effects on other operations.

[0004] At present, there are three main types of coupling detection devices on the market: mechanical, magnetic, existing Hall and laser. In the long-term use of various coupling detection devices, oil, impurities, air particles, dust, etc. are easily accumulated at the detection point, making the coupling detection device prone to mechanical failure, failure to detect, missed detection, wrong detection, and failure to perform the detection when the downhole detection is intact, which brings great safety hazards to the drilling process.

[0005] For mechanical detection methods, the continuous drilling and lowering of the drill during the drilling process causes the mechanical spring to become overly fatigued and damaged during the continuous working process, and the long-term contact friction damage of the machine during the continuous drilling and lowering of the drill greatly reduces the life of the mechanical detection system.

[0006] For the magnetic induction and existing Hall detection systems, because they use permanent magnet detection or DC power supply to generate magnetic field for detection, some ferromagnetic substances will be more or less absorbed during the detection process, or mud and dirt during the drilling process will be absorbed in the detection system, which seriously interferes with the detection system and makes the detection system unstable.

[0007] The photoelectric detection system can detect well during the drilling process. The main disadvantage is that the sand and mud carried by the drill pipe or the coupling head seriously hinder the detection of the photoelectric detection system during the drilling process, and it cannot work normally. Summary of the invention

[0008] The purpose of the present invention is to provide a pressure-bonded collar detection system for drilling sites to solve the problems existing in the above-mentioned prior art.

[0009] To achieve the above-mentioned object, the present invention provides a drilling site-oriented crimping collar detection system, comprising a drill pipe collar body, wherein the drill pipe collar body is composed of an isolation ring and an annular magnetic conductive ring located outside the isolation ring;

[0010] A plurality of electromagnetic coils are installed between the isolation ring and the annular magnetic conductive ring, and the electromagnetic coils are arranged at equal intervals along the outer edge of the isolation ring, and a sensor is installed at one end of each electromagnetic coil close to the isolation ring;

[0011] A signal detection system, electrically connected to each of the sensors, the signal detection system comprising a communication module, and the signal detection system is communicatively connected to a host computer via the communication module;

[0012] The power supply unit includes a DC power supply module and an electromagnetic coil power supply module. The DC power supply module is electrically connected to the signal detection system and each of the sensors respectively, and the electromagnetic coil power supply module is electrically connected to each of the electromagnetic coils.

[0013] Optionally, the signal detection system further includes an addition amplifier module, a peak detection module, a DC amplifier module, a voltage-controlled oscillator, a monostable module and a single-chip microcomputer connected in sequence;

[0014] The addition amplifier module is electrically connected to each of the sensors, and the single chip microcomputer is communicatively connected to the host computer via the communication module.

[0015] Optionally, the communication module adopts RS-485 communication circuit.

[0016] Optionally, the winding directions of adjacent electromagnetic coils are opposite.

[0017] Optionally, each of the sensors is a Hall sensor, and the instantaneous Hall output polarity of each of the sensors is positive.

[0018] Optionally, the isolation ring is an epoxy resin isolation ring.

[0019] Optionally, the electromagnetic coil power supply module and the DC power supply module are both connected to a power source.

[0020] Optionally, the electromagnetic coil power supply module includes a power supply, a DC / AC converter, an AC power amplifier and an isolation transformer connected in sequence, and the isolation transformer is also electrically connected to each of the electromagnetic coils.

[0021] The technical effects of the present invention are:

[0022] During use, the present invention can automatically detect the average diameter of the drill pipe, the average diameter of the coupling head and the difference in the spatial diameter where the Hall sensor for detecting the crimped coupling is arranged, and can eliminate the influence of mud and sand carried by the drill pipe during the lifting process on the detection system; during use, the system transmits several average diameter differences to the host computer in the form of frequency, so that the system eliminates errors in the transmission process and makes the system application more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is an overall structural diagram of the detection of crimped couplings for drilling sites in an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the power supply and magnetic field excitation structure of the crimping collar detection for drilling site in an embodiment of the present invention;

[0027] Figure 3It is a structural schematic diagram of a detection and addition circuit of a crimping collar detection sensor for drilling sites in an embodiment of the present invention;

[0028] Figure 4 It is a structural schematic diagram of a peak detection and amplification circuit for crimping collar detection facing a drilling site in an embodiment of the present invention;

[0029] Figure 5 It is a structural schematic diagram of an A / D conversion and single-chip communication circuit for crimping collar detection at a drilling site in an embodiment of the present invention;

[0030] Explanation of reference numerals: 1. Fixed magnetic coil; 2. Epoxy resin isolation ring; 3. First electromagnetic coil; 4. Second electromagnetic coil; 5. Third electromagnetic coil; 6. Fourth electromagnetic coil; 7. Fifth electromagnetic coil; 8. Sixth electromagnetic coil; 9. Seventh electromagnetic coil; 10. Eighth electromagnetic coil; 11. First Hall sensor; 12. Second Hall sensor; 13. Third Hall sensor; 14. Fourth sensor; 15. Fifth Hall sensor; 16. Sixth Hall sensor; 17. Seventh Hall sensor; 18. Eighth sensor; 19. Power supply system; 20. Detection communication system; 21. DC / AC converter; 22. AC power amplifier; 23. Isolation transformer; 24. Adding amplifier circuit; 25. Peak detection circuit; 26. DC amplifier circuit; 27. Voltage-controlled oscillator; 28. Monostable circuit; 29. ​​STC11F02 single-chip microcomputer; 30. RS-485 communication circuit. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element in the middle; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element in the middle at the same time; the terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only;

[0034] The words “include,” “including,” “have,” “contain,” etc. used in this article are open-ended terms, meaning including but not limited to.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Embodiment 1

[0038] like Figure 1 - Figure 5 As shown, in this embodiment, a crimping coupling detection system for drilling sites is provided, including a drill pipe coupling body, wherein the drill pipe coupling body is composed of an isolation ring and an annular magnetic conductive ring located outside the isolation ring; a plurality of electromagnetic coils are installed between the isolation ring and the annular magnetic conductive ring, and each of the electromagnetic coils is arranged at equal intervals along the circumference of the outer edge of the isolation ring, and a sensor is installed at one end of each electromagnetic coil close to the isolation ring; a signal detection system is electrically connected to each of the sensors, and the signal detection system includes a communication module, and the signal detection system is communicatively connected to a host computer through the communication module; a power supply unit includes a DC power supply module and an electromagnetic coil power supply module, the DC power supply module is electrically connected to the signal detection system and each of the sensors, respectively, and the electromagnetic coil power supply module is electrically connected to each of the electromagnetic coils.

[0039] The present embodiment discloses a pressure-coupling detection for drilling sites, which is a safety detection and control device for lifting and lowering drill pipes at drilling sites. The present embodiment detects the difference in diameter between the pressure-coupling body of the drill pipe and the coupling body of the drill pipe through a sensor, and transmits the signal to the upper computer system after signal conversion and processing, so as to control the movement of the hydraulic device, and the movement of the hydraulic device can drive the movement of the slips. When the sensor detects that the coupling head becomes larger, the upper computer controls the hydraulic system to open, and controls the blowout preventer and slips to close; when the sensor detects that the coupling head becomes smaller, the upper computer controls the hydraulic system to close, and controls the blowout preventer and slips to open, and the drill pipe is in a free lifting and lowering state; the pressure-coupling detection system for drilling sites can intelligently detect the changes of the drill pipe body and the coupling body, and monitor the coupling action behavior through automatic detection and comparison, provide real-time data for the system logic action, and judge the coupling position for the upper computer to operate the blowout preventer and slips, which provides a guarantee for the safe production at the drilling site.

[0040] In view of the technical problems existing in the operation of the existing coupling detection device, this embodiment designs a device that can automatically detect the coupling point, automatically open the passage of the coupling point by the upper computer, or block the passage by the cava, and eliminate all mud and dirt brought along with the drill pipe to realize automatic coupling detection.

[0041] The crimping coupling detection system for drilling sites is composed of a fixed magnetic conductive ring 1, an epoxy resin isolation ring 2, a first electromagnetic coil 3, a second electromagnetic coil 4, a third electromagnetic coil 5, a fourth electromagnetic coil 6, a fifth electromagnetic coil 7, a sixth electromagnetic coil 8, a seventh electromagnetic coil 9, an eighth electromagnetic coil 10, a first sensor 11, a second sensor 12, a third sensor 13, a fourth sensor 14, a fifth sensor 15, a sixth sensor 16, a seventh sensor 17, an eighth sensor 18, a power supply system 19, a detection communication system 20, etc.

[0042] The fixed magnetic coil 1 is directly fixed to the upper ends of the first electromagnetic coil 3, the second electromagnetic coil 4, the third electromagnetic coil 5, the fourth electromagnetic coil 6, the fifth electromagnetic coil 7, the sixth electromagnetic coil 8, the seventh electromagnetic coil 9 and the eighth electromagnetic coil 10, directly forming a closed magnetic loop; the first sensor 11 is located at the lower end of the first electromagnetic coil 3, and is used to detect the magnetic field strength of the first electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the second sensor 12 is located at the lower end of the second electromagnetic coil 4, and is used to detect the magnetic field strength of the second electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the third sensor 13 is located at the lower end of the third electromagnetic coil 5, and is used to detect the magnetic field strength of the third electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the fourth sensor 14 is located at the lower end of the fourth electromagnetic coil 6, and is used to detect the magnetic field strength of the fourth electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the fifth sensor 15 is located at the lower end of the fifth electromagnetic coil 7, and is used to detect the magnetic field strength of the fifth electromagnetic coil through the drill pipe body or through the drill pipe coupling head. The sixth sensor 16 is located at the lower end of the sixth electromagnetic coil 8 to detect the magnetic field strength of the sixth electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the seventh sensor 17 is located at the lower end of the seventh electromagnetic coil 9 to detect the magnetic field strength of the seventh electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the eighth sensor 18 is located at the lower end of the eighth electromagnetic coil 10 to detect the magnetic field strength of the eighth electromagnetic coil through the drill pipe body or through the drill pipe coupling head; the power supply system 19 is composed of two independent power supply systems, one power supply system supplies power to the electromagnetic coil alone, and one power supply system supplies power to the sensor detection, amplification and conditioning circuit and communication processing circuit; the detection communication system 20 is mainly responsible for the conditioning and amplification processing of the sensor system and the communication processing work with the host computer; the epoxy resin isolation ring 2 is mainly used to isolate the gap between the detection system and the drill pipe and the drill pipe coupling head, and is also used to isolate the mud and sand attached to the drill pipe and the drill pipe coupling head, so that the magnetic circuit is unobstructed.

[0043] The placement and arrangement of the eight electromagnetic coils, namely, the first electromagnetic coil 3, the second electromagnetic coil 4, the third electromagnetic coil 5, the fourth electromagnetic coil 6, the fifth electromagnetic coil 7, the sixth electromagnetic coil 8, the seventh electromagnetic coil 9 and the eighth electromagnetic coil 10, have a special placement and arrangement, and the adjacent electromagnetic coils form mutually counter-clockwise windings; if the first electromagnetic coil 3 and the fixed magnetic conductive ring 1 are connected in a clockwise winding, then the second electromagnetic coil 4 and the fixed magnetic conductive ring 1 must be connected in a counter-clockwise winding, and the third electromagnetic coil 5 and the fixed magnetic conductive ring 1 must be connected in a counter-clockwise winding. It must be a clockwise winding, the connection between the fourth electromagnetic coil 6 and the fixed magnetic coil 1 must be a counterclockwise winding, the connection between the fifth electromagnetic coil 7 and the fixed magnetic coil 1 must be a clockwise winding, the connection between the sixth electromagnetic coil 8 and the fixed magnetic coil 1 must be a counterclockwise winding, the connection between the seventh electromagnetic coil 9 and the fixed magnetic coil 1 must be a clockwise winding, and the connection between the eighth electromagnetic coil 10 and the fixed magnetic coil 1 must be a counterclockwise winding. In this way, a completely closed magnetic coil connection is formed between the eighth electromagnetic coil 10 and the first electromagnetic coil 3, ensuring the continuity and smoothness of the magnetic circuit.

[0044] The first sensor 11, the second sensor 12, the third sensor 13, the fourth sensor 14, the fifth sensor 15, the sixth sensor 16, the seventh sensor 17, and the eighth sensor 18 are all linear Hall sensors. If the first sensor 11 is placed at the lower end of the first electromagnetic coil 3, and the first sensor 11 is facing the N side of the magnetic field polarity of the electromagnetic coil, the instantaneous Hall output polarity at this time is positive, then the second sensor 12 is placed at the lower end of the second electromagnetic coil 4, and the second sensor 12 should face the S side of the magnetic field polarity of the electromagnetic coil, and the instantaneous Hall output polarity at this time should also be positive, the third sensor 13 is placed at the lower end of the third electromagnetic coil 5, and the third sensor 13 should face the N side of the magnetic field polarity of the electromagnetic coil, and the instantaneous Hall output polarity at this time is also positive, the fourth sensor 14 is placed at the lower end of the fourth electromagnetic coil 6, and the fourth sensor 14 is facing the electromagnetic line The fifth sensor 15 is placed at the lower end of the fifth electromagnetic coil 7, and the fifth sensor 15 should face the electromagnetic coil, which is the magnetic field polarity N surface. At this time, the instantaneous Hall output polarity is positive. The sixth sensor 16 is placed at the lower end of the sixth electromagnetic coil 8, and the sixth sensor 16 faces the electromagnetic coil magnetic field polarity S surface. At this time, the instantaneous Hall output polarity is also positive. The seventh sensor 17 is placed at the lower end of the seventh electromagnetic coil 9, and the seventh sensor 17 faces the electromagnetic coil magnetic field polarity N surface. At this time, the instantaneous Hall output polarity is also positive. The eighth sensor 18 is placed at the lower end of the eighth electromagnetic coil 10, and the eighth sensor 18 faces the electromagnetic coil magnetic field polarity S surface. At this time, the instantaneous Hall output polarity is also positive. This can ensure the sensitivity of the adding circuit and also ensure the sensitivity of the coupling head detection.

[0045] The power supply system 19 is composed of two independent power supply systems, one of which supplies power to the electromagnetic coil alone, and the other supplies power to the sensor detection system. The system that supplies power to the electromagnetic coil alone is powered by an AC power supply system, which eliminates the possibility that the detection system sensitivity changes due to the fixed magnetic field generated by the use of DC power supply and the adsorption of ferromagnetic dirt, thereby causing the detection system to fail. Through DC / AC conversion, a sinusoidal AC signal of about 1KHz is generated, which is amplified and isolated to form a sinusoidal AC with a fixed frequency and effective value, and is supplied to each electromagnetic coil. In this way, the effect of the AC signal can eliminate the influence of ferromagnetic substances and mud on the drill pipe during the drilling process on the detection system.

[0046] Eight spatially symmetrical mutually coupled electromagnetic systems and eight mutually corresponding Hall sensors are designed to form an additive form to reduce the influence of the eccentricity of the drilling drill pipe or the drill pipe coupling head on the detection error. The first electromagnetic coil 3, the second electromagnetic coil 4, the third electromagnetic coil 5, the fourth electromagnetic coil 6, the fifth electromagnetic coil 7, the sixth electromagnetic coil 8, the seventh electromagnetic coil 9, and the eighth electromagnetic coil 10 are symmetrically distributed in space, and the first sensor 11, the second sensor 12, the third sensor 13, the fourth sensor 14, the fifth sensor 15, the sixth sensor 16, the seventh sensor 17, and the eighth sensor 18 are also symmetrically distributed in space, and the signals of these eight sensors are summed by an addition circuit, so that the detection deviation caused by the eccentricity of the drill pipe and the drill pipe coupling head to the detection system during movement is completely avoided.

[0047] In the detection system of the detection communication system 20, an addition circuit is used to satisfactorily solve the detection signal deviation caused by the eccentricity of the drill pipe and the drill pipe coupling head to the detection system during movement.

[0048] Based on the spatially symmetrical mutually coupled electromagnetic system, the addition circuit can perform addition operations normally, thus avoiding unnecessary processing of inconsistent output values ​​of the Hall sensor when the drill pipe or the drill pipe coupling is in the eccentric position of the coupling detection system. The addition operation is to make different Hall sensors generate different Hall potentials and different detection values ​​when the drill pipe or the drill pipe coupling is in the eccentric position of the coupling detection system, and the entire system is placed in the same diameter difference range through the addition operation.

[0049] In the detection communication system 20, the communication system adopts the RS-485 serial data communication system, which achieves perfect docking with the host computer system. This system can achieve the difference between the average diameter of the drill pipe and the coupling drill pipe and the spatial average diameter between the detection Hall sensor through the peak detection circuit and the amplifier circuit. Through the pressure-coupling detection, the difference between the average diameter of the drill pipe and the coupling drill pipe and the spatial average diameter between the detection Hall sensor is converted into frequency information through the voltage-controlled oscillator and the monostable amplifier circuit, and then the signal is transmitted to the host computer for processing through the STC11F02 microcontroller and RS-485.

[0050] like Figure 1As shown, the drill pipe crimping collar detection for the drilling site includes a fixed magnetic ring 1, an epoxy resin isolation ring 2, a first electromagnetic coil 3, a second electromagnetic coil 4, a third electromagnetic coil 5, a fourth electromagnetic coil 6, a fifth electromagnetic coil 7, a sixth electromagnetic coil 8, a seventh electromagnetic coil 9, an eighth electromagnetic coil 10, a first Hall sensor 11, a second Hall sensor 12, a third Hall sensor 13, a fourth Hall sensor 14, a fifth Hall sensor 15, a sixth Hall sensor 16, a seventh Hall sensor 17, an eighth Hall sensor 18, a power supply system 19, a detection communication system 20, etc. The fixed magnetic conductive ring 1 is respectively connected with the first electromagnetic coil 3, the second electromagnetic coil 4, the third electromagnetic coil 5, the fourth electromagnetic coil 6, the fifth electromagnetic coil 7, the sixth electromagnetic coil 8, the seventh electromagnetic coil 9 and the eighth electromagnetic coil 10 through the magnetic core and fixed together. The first electromagnetic coil 3 and the second electromagnetic coil 4 form a smooth and complete NS magnetic pole when energized, and the second electromagnetic coil 4 and the third electromagnetic coil 5 also form a smooth and complete NS magnetic pole when energized. The third electromagnetic coil 5 and the fourth electromagnetic coil 6 form a smooth and complete NS magnetic pole when energized, and the fourth electromagnetic coil 6 and the fifth electromagnetic coil 7 also form a smooth and complete NS magnetic pole when energized. The fifth electromagnetic coil 7 and the sixth electromagnetic coil 8 also form a smooth and complete NS magnetic pole when energized, the sixth electromagnetic coil 8 and the seventh electromagnetic coil 9 also form a smooth and complete NS magnetic pole when energized, the seventh electromagnetic coil 9 and the eighth electromagnetic coil 10 also form a smooth and complete NS magnetic pole when energized, and the eighth electromagnetic coil 10 also forms a smooth and complete NS magnetic pole when energized. To form a smooth and complete NS magnetic pole; the first Hall sensor 11 is located under the magnetic pole of the first electromagnetic coil 3, the second Hall sensor 12 is located under the magnetic pole of the second electromagnetic coil 4, the third Hall sensor 13 is located under the magnetic pole of the third electromagnetic coil 5, the fourth Hall sensor 14 is located under the magnetic pole of the fourth electromagnetic coil 6, the fifth Hall sensor 15 is located under the magnetic pole of the fifth electromagnetic coil 7, the sixth Hall sensor 16 is located under the magnetic pole of the sixth electromagnetic coil 8, the seventh Hall sensor 17 is located under the magnetic pole of the seventh electromagnetic coil 9, and the eighth Hall sensor 18 is located under the magnetic pole of the eighth electromagnetic coil 10, and the directions of their magnetic field polarization must be consistent, that is to say, the first Hall sensor 11, the second Hall sensor 12, the third Hall sensor 13, the fourth Hall sensor 14, the fifth Hall sensor 15, the sixth Hall sensor 16, the seventh Hall sensor 17, and the eighth Hall sensor 18 are polarized at their respective electromagnetic polarities, and these eight linear Hall sensors have Hall voltage characteristics of the same polarity at any same time.

[0051] like Figure 2-Figure 5As shown, the DC / AC converter 21 is connected to the AC power amplifier 22 to achieve a constant AC voltage value and frequency, and an AC voltage with the same frequency, phase and stable amplitude is provided to the first electromagnetic coil 3, the second electromagnetic coil 4, the third electromagnetic coil 5, the fourth electromagnetic coil 6, the fifth electromagnetic coil 7, the sixth electromagnetic coil 8, the seventh electromagnetic coil 9 and the eighth electromagnetic coil 10 through the isolation transformer 23 to generate an alternating magnetic field, thereby avoiding many factors affecting the detection caused by the ferromagnetic materials and mud brought out by the drill pipe and the drill pipe coupling during the drilling process.

[0052] The adding amplifier circuit 24 mainly completes the addition of signals of the first Hall sensor 11, the second Hall sensor 12, the third Hall sensor 13, the fourth Hall sensor 14, the fifth Hall sensor 15, the sixth Hall sensor 16, the seventh Hall sensor 17 and the eighth Hall sensor 18 of the same frequency and phase. The reason for the addition is that the drill pipe or the drill pipe coupling head is often not exactly at the center when passing through the coupling to detect the Hall sensor, and some deviation occurs, resulting in a small output voltage of the Hall sensor far from the Hall sensor, while a large output voltage of the Hall sensor close to the Hall sensor. In order to make the detection accurate, the embodiment adopts the method of in-phase addition, which well solves the problem of affecting the detection accuracy due to eccentricity. The peak detection circuit 25 is used to detect the maximum peak voltage of the Hall sensor to make the measurement more accurate. The DC amplifier circuit 26 is used to provide the voltage-controlled oscillator 27 with a more accurate and stable measurement accuracy signal. The monostable circuit 28 is used to digitize the frequency output by the voltage-controlled oscillator 27. The STC11F02 microcontroller 29 uses INTO interrupt processing to count the frequency digitization output by the voltage-controlled oscillator 27 output by the monostable circuit 28, so that the RS-485 communication circuit 30 can directly transmit the detected data to the host computer.

[0053] During use, the crimped coupling detection system of this embodiment can automatically detect the difference between the average diameter of the drill pipe, the average diameter of the coupling head and the spatial diameter of the crimped coupling detection Hall sensor, and can eliminate the influence of mud and sand carried by the drill pipe during the lifting process on the detection system; during use, the system transmits several average diameter differences to the host computer in the form of frequency, so that the system eliminates the errors occurring during the transmission process, making the system application more stable and reliable.

[0054] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pressure-coupling detection system for drilling sites, characterized in that: It comprises a drill pipe coupling body, wherein the drill pipe coupling body is composed of an isolating ring and an annular magnetic conductive ring located outside the isolating ring; A plurality of electromagnetic coils are installed between the isolation ring and the annular magnetic conductive ring, and the electromagnetic coils are arranged at equal intervals along the outer edge of the isolation ring. A sensor is installed at one end of each electromagnetic coil close to the isolation ring, and the winding directions of adjacent electromagnetic coils are opposite; A signal detection system, electrically connected to each of the sensors, the signal detection system comprising a communication module, and the signal detection system is communicatively connected to a host computer via the communication module; A power supply unit, comprising a DC power supply module and an electromagnetic coil power supply module, wherein the DC power supply module is electrically connected to the signal detection system and each of the sensors, respectively, and the electromagnetic coil power supply module is electrically connected to each of the electromagnetic coils; The signal detection system also includes an additive amplifier module, a peak detection module, a DC amplifier module, a voltage-controlled oscillator (27), a monostable module and a single-chip microcomputer connected in sequence; The addition amplifier module is electrically connected to each of the sensors, and the single chip microcomputer is communicatively connected to the host computer via the communication module; Each of the sensors adopts a Hall sensor, and the instantaneous Hall output polarity of each of the sensors is positive; The electromagnetic coil power supply module comprises a power supply, a DC / AC converter (21), an AC power amplifier (22) and an isolation transformer (23) which are connected in sequence, and the isolation transformer (23) is also electrically connected to each of the electromagnetic coils.

2. A drilling site-oriented crimping collar detection system according to claim 1, characterized in that: The communication module adopts RS-485 communication circuit.

3. The drilling site-oriented crimping collar detection system according to claim 1, characterized in that: The isolation ring is an epoxy resin isolation ring (2).

4. The drilling site-oriented crimping collar detection system according to claim 1, characterized in that: The electromagnetic coil power supply module and the DC power supply module are both connected to a power source.

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