Pipe load monitoring system

Abstract

The present disclosure relates to a pipe load monitoring system, which belongs to the field of pipe monitoring. The pipe load monitoring system includes a collection device, a ground receiving device, a communication device and a transmission cable. Any collection device is located between two adjacent sections of the pipe, and the collection device includes a first wireless transmission module and a first magnetic positioning module. The communication device has a fixing module, a positioning module and a second wireless transmission module. One end of the transmission cable is electrically connected to the communication device, and the other end is electrically connected to the ground receiving device. When the second magnetic positioning module is aligned with the first magnetic positioning module, a positioning success signal is sent to the ground receiving device; the ground receiving device sends a control signal to the fixing module to control the fixing module to be fixed on the collection device; the ground receiving device sends a connection signal to the second wireless transmission module; the second wireless transmission module communicates with the first wireless transmission module to obtain the pipe monitoring data collected by the collection device, and transmits it to the ground receiving device.

Description

Technical Field

[0001] The present disclosure relates to the field of downhole tubular string monitoring, and in particular to a tubular string load monitoring system. Background Art

[0002] Downhole tubing can lift crude oil from the oil well to the ground, and is an important part of the oil extraction process. Downhole tubing will be deformed in the oil well due to loads such as axial force, internal and external pressure, and temperature. If the deformation of the downhole tubing is serious, it will affect the work of the downhole tubing, so the load of the downhole tubing needs to be monitored to understand the working status of the downhole tubing.

[0003] In the related technology, a tubing monitoring device is connected to the tubing before the tubing is put into the well. The tubing monitoring device is put into the well along with the tubing to measure the working parameters of the tubing. After the construction work is completed, the tubing monitoring device is pulled out together with the tubing, and the collected data is played back by connecting the tubing monitoring device to the host computer.

[0004] However, this method cannot monitor the working status of the downhole tubular in real time. When the working status of the downhole tubular changes, the working status of the downhole tubular cannot be understood in real time. Summary of the invention

[0005] The embodiment of the present disclosure provides a pipe string load monitoring system, which can monitor the working status of the downhole pipe string in real time. The technical solution is as follows:

[0006] The present disclosure provides a pipe string load monitoring system for monitoring the load of the pipe string, the pipe string load monitoring system comprising: a plurality of acquisition devices, any acquisition device is located between two adjacent sections of the pipe string, the acquisition device comprises a first wireless transmission module and a first magnetic positioning module; a ground receiving device, located outside the well; a communication device, located inside the well, the communication device comprises a fixing module, a second magnetic positioning module and a second wireless transmission module; a transmission cable, one end of which is electrically connected to the communication device, and the other end of which is electrically connected to the ground receiving device, the transmission cable is used to drive the communication device to move up and down in the well under power control; wherein the ground receiving device is located outside the well, and the communication device comprises a first magnetic positioning module and a second wireless transmission module; a ... inside the well, and the communication device comprises a first magnetic positioning module and a second wireless transmission module; a ground receiving device is located inside the well, and the communication device comprises a first magnetic positioning module and a second wireless transmission module; a ground receiving device is located inside the well, and the communication device comprises a first magnetic positioning module and a second wireless transmission module; a ground receiving device is located inside the well, and the communication device comprises a first magnetic positioning module and a second magnetic positioning module; a ground receiving device The second magnetic positioning module is used to send a positioning success signal to the ground receiving device when it is aligned with the first magnetic positioning module; the ground receiving device is used to send a control signal to the fixing module when receiving the positioning success signal, so as to control the fixing module to be fixed on the acquisition device; the ground receiving device is also used to send a connection signal to the second wireless transmission module when receiving the positioning success signal; the second wireless transmission module is used to communicate with the first wireless transmission module when receiving the connection signal, obtain the pipe column monitoring data collected by the acquisition device, and transmit it to the ground receiving device through the transmission cable.

[0007] In an implementation of the embodiment of the present disclosure, the fixing module is a retractable fixing claw, the top of the acquisition device has a fixing platform, and the retractable fixing claw is fixed on the fixing platform under the control of the control signal.

[0008] In one implementation of the embodiment of the present disclosure, the communication device has a cylindrical communication outer cylinder; the retractable fixed claw includes: a motor, electrically connected to one end of the transmission cable, the motor is located in the inner cavity of the communication outer cylinder; a transmission shaft, extending along a first direction, one end of the transmission shaft is connected to the output shaft of the motor, the transmission shaft can rotate around the center line of the transmission shaft, the first direction is the length direction of the communication outer cylinder; a cam, sleeved on the other end of the transmission shaft, the wheel axle of the cam extends along the first direction; a fixed claw base, fixed in the inner cavity of the communication outer cylinder In the embodiment of the present invention, the middle part of the fixed claw base has a through hole extending in the second direction; two claw bodies are respectively located on both sides of the fixed claw base along the second direction, the middle parts of the two claw bodies close to the first ends are hinged to the fixed claw base, and the rotation axes of the two claw bodies extend along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; at least part of the cam is located between the first ends of the two claw bodies; a compression spring, the middle part of the compression spring is located in the through hole, and the two ends of the compression spring are respectively connected to the middle parts of the two claw bodies.

[0009] In an implementation of the embodiment of the present disclosure, the acquisition device also includes a power supply; the first magnetic positioning module is a reed switch; when the distance between the second magnetic positioning module and the reed switch is less than a first threshold, the reed switch turns on the first wireless transmission module and the power supply.

[0010] In one implementation of the embodiment of the present disclosure, the collection device also includes: a collection outer cylinder, extending along the length direction of the pipe column; a flow tube, extending along the length direction of the pipe column, the flow tube is located in the collection outer cylinder, and a sealed annular installation cavity is provided between the flow tube and the collection outer cylinder, and the first wireless transmission module and the first magnetic positioning module are both located in the annular installation cavity.

[0011] In an implementation of the embodiment of the present disclosure, the annular installation cavity is an eccentric annular installation cavity.

[0012] In one implementation of the embodiment of the present disclosure, the collection device also includes: a cylindrical collection upper base, one end of which is respectively connected to the outer side wall of the flow tube and the inner side wall of the collection outer tube; a tension connecting tube, one end of which is connected to the other end of the collection upper base; a cylindrical collection upper joint, which is connected to the other end of the tension connecting tube; a temperature and pressure sensor, which is located in the annular mounting cavity, and the temperature and pressure sensor is electrically connected to the first wireless transmission module.

[0013] In an implementation manner of the embodiment of the present disclosure, the communication device further includes: a connection module connected to the transmission cable; and a weighting module connected between the connection module and the fixing module.

[0014] In an implementation of the embodiment of the present disclosure, the weighting module includes: a weighting rod outer protective tube having a weighting outer protective tube cavity; and a tungsten core located in the weighting outer protective tube cavity.

[0015] In one implementation of the embodiment of the present disclosure, the communication device includes: a communication outer protective tube, having a communication outer protective tube cavity; a communication upper joint, sealed and connected to one end of the communication outer protective tube; an antenna protective cap, sealed and connected to the other end of the communication outer protective tube, the antenna protective cap having a first mounting groove, the first mounting groove being connected to the communication outer protective tube cavity; a communication circuit board skeleton, located in the communication outer protective tube cavity; a communication circuit board, mounted on the communication circuit board skeleton; the first wireless transmission module includes: a first antenna fixing seat, located in the first mounting groove; a first antenna, mounted on the first antenna fixing seat, the first antenna being electrically connected to the communication circuit board.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure include at least:

[0017] In the disclosed embodiment, the acquisition device is used to collect pipe string monitoring data. When it is necessary to monitor the downhole pipe string, the transmission cable drives the communication device to move up and down in the well under power control. When the second magnetic positioning module is aligned with the first magnetic positioning module, the second magnetic positioning module sends a positioning success signal to the ground receiving device; when the ground receiving device receives the positioning success signal, it sends a control signal to the fixing module to control the fixing module to be fixed on the acquisition device. At the same time, when the ground receiving device receives the positioning success signal, it sends a connection signal to the second wireless transmission module; when the second wireless transmission module receives the connection signal, it communicates with the first wireless transmission module to obtain the pipe string monitoring data collected by the acquisition device, and transmits it to the ground receiving device through the transmission cable. In this way, the parameters of the downhole pipe string can be transmitted to the ground receiving device in real time, so that the staff can monitor the downhole pipe string in real time. At the same time, after the monitoring of one of the pipe strings is completed, the communication device can be moved through the transmission cable to the collection device of another pipe string to monitor the other pipe string in real time; in addition, the position of the communication device in the well can be controlled through the transmission cable, and the data collected by the collection devices of multiple sections of the pipe string in the well can be transmitted to realize the monitoring of multiple sections of the pipe string. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a structural schematic diagram of a pipe string load monitoring system provided by an embodiment of the present disclosure;

[0020] Figure 2 is a structural schematic diagram of a collection device provided by an embodiment of the present disclosure;

[0021] Figure 3 is a cross-sectional view of a collection device provided by an embodiment of the present disclosure;

[0022] Figure 4 is a cross-sectional view of a fixing module provided by an embodiment of the present disclosure;

[0023] Figure 5 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 6 is a cross-sectional view of a positioning module and a second wireless transmission module provided by an embodiment of the present disclosure;

[0025] Figure 7is a cross-sectional view of a connection module provided by an embodiment of the present disclosure;

[0026] Figure 8 It is a cross-sectional view of a weighting module provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 1 is a schematic diagram of a pipe string load monitoring system provided by an embodiment of the present disclosure. The pipe string load monitoring system is used to monitor the load of the pipe string 10. Figure 1 The pipe string load monitoring system includes: a plurality of acquisition devices 20, a ground receiving device 30, a communication device 40 and a transmission cable 50. The multi-section pipe string 10 is located in the well. Any acquisition device 20 is located between two adjacent sections of the multi-section pipe string 10, and the acquisition device 20 includes a first wireless transmission module 201 and a first magnetic positioning module 202. The ground receiving device 30 is located outside the well. The communication device 40 is located in the well, and the communication device 40 has a fixing module 401, a second magnetic positioning module 402 and a second wireless transmission module 403. One end of the transmission cable 50 is electrically connected to the communication device 40, and the other end of the transmission cable 50 is electrically connected to the ground receiving device 30. The transmission cable 50 is used to drive the communication device 40 to move up and down in the well under power control.

[0029] Among them, the second magnetic positioning module 402 is used to send a positioning success signal to the ground receiving device 30 when it is aligned with the first magnetic positioning module 202; the ground receiving device 30 is used to send a control signal to the fixing module 401 when receiving the positioning success signal, so as to control the fixing module 401 to be fixed on the acquisition device 20; the ground receiving device 30 is also used to send a connection signal to the second wireless transmission module 403 when receiving the positioning success signal; the second wireless transmission module 403 is used to communicate with the first wireless transmission module 201 when receiving the connection signal, obtain the pipe column monitoring data collected by the acquisition device 20, and transmit it to the ground receiving device 30 through the transmission cable 50.

[0030] In the disclosed embodiment, the acquisition device is used to collect pipe string monitoring data. When it is necessary to monitor the downhole pipe string, the transmission cable drives the communication device to move up and down in the well under power control. When the second magnetic positioning module is aligned with the first magnetic positioning module, the second magnetic positioning module sends a positioning success signal to the ground receiving device; when the ground receiving device receives the positioning success signal, it sends a control signal to the fixing module to control the fixing module to be fixed on the acquisition device. At the same time, when the ground receiving device receives the positioning success signal, it sends a connection signal to the second wireless transmission module; when the second wireless transmission module receives the connection signal, it communicates with the first wireless transmission module to obtain the pipe string monitoring data collected by the acquisition device, and transmits it to the ground receiving device through the transmission cable. In this way, the parameters of the downhole pipe string can be transmitted to the ground receiving device in real time, so that the staff can monitor the downhole pipe string in real time. At the same time, after the monitoring of one of the pipe strings is completed, the communication device can be moved through the transmission cable to the collection device of another pipe string to monitor the other pipe string in real time; in addition, the position of the communication device in the well can be controlled through the transmission cable, and the data collected by the collection devices of multiple sections of the pipe string in the well can be transmitted to realize the monitoring of multiple sections of the pipe string.

[0031] Figure 2 is a schematic diagram of the structure of a collection device provided by an embodiment of the present disclosure. Figure 2 The collection device 20 includes a collection upper joint 210 and a collection lower joint 212, which are used to connect with the pipe string. Figure 3 is a cross-sectional view of a collection device provided by an embodiment of the present disclosure. Figure 3 The collection device 20 also includes a collection outer tube 205. The collection upper joint 210, the collection lower joint 212 and the collection outer tube 205 are all cylindrical structures. Along the extension direction of the collection outer tube 205, one end of the collection outer tube 205 is connected to the collection upper joint 210, and the other end of the collection outer tube 205 is connected to the collection lower joint 212. The collection upper joint 210 and the collection lower joint 212 are respectively connected to the pipe column 10, thereby connecting the collection outer tube 205 to the pipe column 10. The first wireless transmission module 201 and the first magnetic positioning module 202 are both located in the inner cavity of the collection outer tube 205. Figure 2 In order to clearly show the other structures in the outer tube, Figure 2 The collecting outer cylinder 205 is not shown.

[0032] Exemplarily, the upper collection joint 210 is connected to the pipe string 10 through threads, and the lower collection joint 212 is connected to the pipe string 10 through threads.

[0033] See again Figure 3 The collection device 20 also includes a connecting ring 213, which connects the collection outer tube 205 and the collection lower joint 212.

[0034] Exemplarily, the collection outer cylinder 205 is connected to the collection upper joint 210 by threads; the connecting ring 213 is connected to the collection outer cylinder 205 by threads, and the connecting ring 213 is connected to the collection lower joint 212 by threads.

[0035] For example Figure 3 As shown, the upper collection joint 210 has an internal thread, and one end of the collection outer tube 205 has an external thread, and the internal and external threads of the two cooperate with each other to achieve connection; the other end of the collection outer tube 205 has an internal thread, and one end of the connecting ring 213 has an external thread, and the internal and external threads of the two cooperate with each other to achieve connection; the other end of the connecting ring 213 has an internal thread, and the lower collection joint 212 has an external thread, and the internal and external threads of the two cooperate with each other to achieve connection.

[0036] See again Figure 3 The pipe string load monitoring system also includes a sealing ring 100. The connection between the collection outer tube 205 and the collection upper joint 210 has two sealing rings 100, the connection between the collection outer tube 205 and the connecting ring 213 has two sealing rings 100, and the connection between the connecting ring 213 and the collection lower joint 212 has two sealing rings 100.

[0037] See again Figure 3 The collection device 20 also includes a flow tube 206. The collection outer cylinder 205 and the flow tube 206 both extend along the first direction a. The flow tube 206 is located in the collection outer cylinder 205. A sealed annular installation cavity 207 is provided between the flow tube 206 and the collection outer cylinder 205. The first wireless transmission module 201 and the first magnetic positioning module 202 are both located in the annular installation cavity 207.

[0038] The medium underground flows through the cavity of the flow tube 206 to ensure that the medium underground can flow. At the same time, the sealed annular installation cavity 207 formed by the flow tube 206 and the collection outer tube 205 is used to install the first wireless transmission module 201 and the first magnetic positioning module 202, so that the liquid can be isolated from the first wireless transmission module 201 and the first magnetic positioning module 202, thereby preventing the liquid from affecting the operation of the first wireless transmission module 201 and the first magnetic positioning module 202.

[0039] See again Figure 3, the flow tube 206 and the collection outer cylinder 205 are arranged eccentrically, so that the annular installation cavity 207 is an eccentric annular installation cavity. The eccentric annular installation cavity 207 has a large space on one side and a small space on the other side. The first wireless transmission module 201 and the first magnetic positioning module 202 are installed on the side with a large space, which is convenient for installing the first wireless transmission module 201 and the first magnetic positioning module 202. At the same time, when the volume of the annular installation cavity 207 is the same, compared with the concentric arrangement of the flow tube 206 and the collection outer cylinder 205, the eccentric arrangement of the flow tube 206 and the collection outer cylinder 205 can make the cavity of the flow tube 206 larger, thereby ensuring the circulation of the downhole liquid.

[0040] Combination Figure 2 and Figure 3 The collection device 20 further includes a power supply 204 and a first circuit board assembly 214, both of which are located in the annular mounting cavity 207. The power supply 204 provides electrical energy to the collection device 20.

[0041] Illustratively, the power source 204 is a battery.

[0042] See again Figure 3 The collection device 20 also includes an upper collection base 208 and a lower collection base 215, which are used to seal the annular installation cavity 207. The upper collection base 208 and the lower collection base 215 are both cylindrical structures and are respectively located at the two ends of the flow tube 206. One end of the upper collection base 208 is respectively connected to the outer wall of the flow tube 206 and the inner wall of the collection outer cylinder 205, and one end of the lower collection base 215 is respectively connected to the outer wall of the flow tube 206 and the inner wall of the collection outer cylinder 205. One end of the annular installation cavity 207 is blocked by the upper collection base 208, and the other end of the annular installation cavity 207 is blocked by the lower collection base 215, so as to achieve the sealing of the annular installation cavity 207.

[0043] The other end of the upper collection base 208 is connected to the upper collection joint 210 , and the other end of the lower collection base 215 is connected to the lower collection joint 212 .

[0044] Exemplarily, the upper collecting base 208 is connected to the outer wall of the flow tube 206 and the inner wall of the collecting outer cylinder 205 by threads, and the upper collecting base 208 is connected to the upper collecting joint 210 by threads. The lower collecting base 215 is connected to the outer wall of the flow tube 206 and the inner wall of the collecting outer cylinder 205 by threads, and the lower collecting base 215 is connected to the lower collecting joint 212 by threads.

[0045] See again Figure 3The connection between the upper collecting base 208 and the collecting outer cylinder 205 has two sealing rings 100. The connection between the upper collecting base 208 and the flow tube 206 has two sealing rings 100. The connection between the upper collecting base 208 and the collecting upper joint 210 has two sealing rings 100. The connection between the lower collecting base 215 and the flow tube 206 has two sealing rings 100. The connection between the lower collecting base 215 and the collecting outer cylinder 205 has two sealing rings 100. The connection between the lower collecting base 215 and the collecting lower joint 212 has two sealing rings 100.

[0046] See again Figure 3 The collection device 20 further includes a fixing platform 203, which is located in the collection upper joint 210 and is used to install the fixing module 401. The fixing platform 203 has a chamfer at one end facing the collection upper joint 210. Since one end of the communication device 40 needs to pass through the inner cavity of the fixing platform 203, a chamfer is arranged at one end of the fixing platform 203, so that the opening at one end of the fixing platform 203 is larger, which is convenient for the communication device 40 to pass through the fixing platform 203, and then the fixing module 401 is installed on the fixing platform 203.

[0047] See again Figure 3 The acquisition device 20 further includes a tension connection tube 209, one end of which is connected to the other end of the acquisition upper base 208, and the other end of which is connected to the acquisition upper joint 210. The tension connection tube 209 is connected to the pipe string 10 through the acquisition upper joint 210, so the axial load on the tension connection tube 209 is the same as the axial load on the pipe string 10. A strain gauge is arranged on the tension connection tube 209, and the strain gauge is used to measure the axial load of the tension connection tube 209. The strain gauge is electrically connected to the first wireless transmission module 201. The axial load is transmitted to the ground receiving device 30 through the first wireless transmission module 201. Since the axial load on the tension connection tube 209 is the same as the axial load on the pipe string 10, the axial load on the pipe string 10 can be monitored by measuring the axial load on the tension connection tube 209.

[0048] Exemplarily, the tension connection tube 209 is connected to the upper collection base 208 by threads, and the tension connection tube 209 is connected to the upper collection joint 210 by threads.

[0049] See again Figure 3 The connection between the tension connection tube 209 and the upper collection base 208 has two sealing rings 100 , and the connection between the tension connection tube 209 and the upper collection joint 210 has two sealing rings 100 .

[0050] See again Figure 3The collection device 20 also includes a first protective seat 216 for installing the first wireless transmission module 201. The first protective seat 216 is a cylindrical structure. The outer side wall of the first protective seat 216 is respectively connected to the inner side wall of the collection lower base 215 and the inner side wall of the collection lower joint 212 to ensure the stability of the first protective seat 216. The first protective seat 216 has a second mounting groove 217, which is connected to the annular mounting cavity 207. The first wireless transmission module 201 is located in the second mounting groove 217, so that the first wireless transmission module 201 can be electrically connected to the power supply 204 located in the annular mounting cavity 207, and the power supply 204 provides power to the first wireless transmission module 201. At the same time, the first wireless transmission module 201 can also be electrically connected to the first circuit board assembly 214 located in the annular mounting cavity 207, so that the first circuit board assembly 214 can store data of the first wireless transmission module 201.

[0051] In the embodiment of the present disclosure, the first wireless transmission module 201 includes a second antenna, and the second antenna performs data transmission with the second wireless transmission module 403 .

[0052] See again Figure 3 The acquisition device 20 also includes a temperature and pressure sensor 211, which is located in the annular installation cavity 207 and is electrically connected to the first wireless transmission module 201. The temperature and pressure sensor 211 is used to measure the temperature and pressure in the well, and transmit the temperature and pressure to the first wireless transmission module 201, and transmit the temperature and pressure to the ground receiving device 30 through the first wireless transmission module 201, so that the staff can monitor the temperature, axial force, pressure and other loads of the pipe string. In the embodiment of the present disclosure, the load of the pipe string includes not only the force of the pipe string, but also the temperature of the pipe string.

[0053] See again Figure 3 There is a gap between the tension connection tube 209 and the upper collection joint 210, and a through groove 221 extending along the length direction of the upper collection substrate 208 is provided on the side wall of the upper collection substrate 208. The through groove 221 is connected to the annular installation cavity 207, so that the wire can electrically connect the reed switch to the power supply 204 located in the annular installation cavity 207, and at the same time, the strain gauge on the tension connection tube 209 can be electrically connected to the first wireless transmission module 201.

[0054] See again Figure 3 An internal pressure taking hole 218 is provided on the inner wall of the upper base 208 for collecting data. The internal pressure taking hole 218 is connected to the inner cavity of the flow tube 206 through a through groove 221. The internal pressure taking hole 218 is connected to a temperature and pressure sensor 211 for monitoring the pressure of the inner cavity of the flow tube 206. The liquid in the well is connected to the temperature and pressure sensor 211 through the internal pressure taking hole 218 to measure the pressure.

[0055] See again Figure 2 The outer wall of the upper base 208 is provided with an external pressure taking hole 219, which is connected to the inner cavity of the flow tube 206 through a through slot 221, and is connected to the temperature and pressure sensor 211, for monitoring the pressure outside the flow tube 206. The outer wall of the upper base 208 is provided with a direct reading port 220, in which a transmission line is arranged, which is connected to the first circuit board assembly 214, and the data in the first circuit board assembly 214 can be directly exported through the transmission line in the direct reading port 220.

[0056] In the embodiment of the present disclosure, the first magnetic positioning module 202 is a reed switch. When the distance between the second magnetic positioning module 402 and the reed switch is less than a first threshold, the reed switch conducts the first wireless transmission module 201 and the power supply 204. The reed switch is a switch that can be controlled by a magnetic field, and the reed switch is located on the connection line between the first wireless transmission module 201 and the power supply 204. The second magnetic positioning module 402 can generate a magnetic field. When the distance between the second magnetic positioning module 402 and the reed switch is less than a first threshold, the reed switch is closed by the magnetic field, thereby connecting the first wireless transmission module 201 and the power supply 204.

[0057] In the embodiment of the present disclosure, when the communication device is lowered by the transmission cable 50, the approximate position of the communication device 40 can be inferred according to the length of the lowered transmission cable 50. When the communication device 40 reaches the target layer, the transmission cable 50 is slowly moved. When the distance between the second magnetic positioning module 402 and the reed switch is less than the first threshold, it means that the communication device 40 has reached the vicinity of the acquisition device 20. The second magnetic positioning module 402 sends a positioning success signal to the ground receiving device 30. When the ground receiving device 30 receives the positioning success signal, it sends a control signal to the fixing module 401 to control the fixing module 401 to be fixed on the acquisition device 20. At the same time, the reed switch conducts the first wireless transmission module 201 and the power supply 204, so that the first wireless transmission module 201 transmits data to the second wireless transmission module 403. Power is provided to the first wireless transmission module 201 only when data needs to be transmitted, and power is not provided to the first wireless transmission module 201 when data is not transmitted, so as to save power.

[0058] Figure 4 is a cross-sectional view of a fixing module provided by an embodiment of the present disclosure. Figure 4The fixing module 401 is a retractable fixing claw, and the communication device 40 has a communication outer cylinder 404 extending along the first direction a. The retractable fixing claw includes: a motor 405, a transmission shaft 406, a cam 407, a fixing claw base 408, two claw bodies 409 and a compression spring 411. The motor 405 is electrically connected to one end of the transmission cable 50, and the motor 405 is located in the inner cavity of the communication outer cylinder 404. The transmission shaft 406 extends along the first direction a, one end of the transmission shaft 406 is connected to the output shaft of the motor 405, and the transmission shaft 406 can rotate around the center line of the transmission shaft 406. The cam 407 is sleeved on the other end of the transmission shaft 406, and the wheel axle of the cam 407 extends along the first direction a. The fixing claw base 408 is fixed in the inner cavity of the communication outer cylinder 404, and the middle part of the fixing claw base 408 has a through hole extending along the second direction. Along the second direction b, the two claw bodies 409 are respectively located on both sides of the fixed claw base 408, and the middle parts of the two claw bodies 409 near the first end are hinged to the fixed claw base 408. The rotation axes 410 of the two claw bodies 409 extend along the third direction, and the first direction a, the second direction b and the third direction are perpendicular to each other. At least part of the cam 407 is located between the first ends of the two claw bodies 409. The middle part of the compression spring 411 is located in the through hole, and the two ends of the compression spring 411 are respectively connected to the middle parts of the two claw bodies 409. The communication outer cylinder 404 has a through groove at a position opposite to the claw body 409.

[0059] In the embodiment of the present disclosure, one end of the two claw bodies 409 is hinged to the fixed claw base 408, so the two claw bodies 409 can rotate around the rotation axis 410. When the claw body 409 rotates, the claw body 409 extends from the through slot of the communication outer cylinder 404, and the other end of the claw body 409 is abutted on the fixed platform 203, thereby fixing the fixed module 401 on the acquisition device 20. The motor 405 rotates, and the output shaft of the motor 405 drives the transmission shaft 406 to rotate, thereby driving the cam 407 to rotate. Since the cross section of the cam 407 is an ellipse, when the short axis of the cam 407 extends along the second direction b, the compression spring 411 pushes the other end of the two claw bodies 409, and the two claw bodies 409 rotate, so that the claw body 409 extends from the through slot of the communication outer cylinder 404. When the long axis of the cam 407 extends along the second direction b, the two ends of the cam 407 push one end of the two claws 409, and the two claws 409 rotate so that the claws 409 retract into the communication outer cylinder 404, facilitating the communication device 40 to move along the first direction a.

[0060] Figure 5 yes Figure 1 Enlarged view of A in the middle. Figure 5 The other end of the claw body 409 abuts against the fixing platform 203 to fix the communication device 40.

[0061] See again Figure 4The communication device 40 further includes a fixed shaft 425 , and the fixed claw base 408 is fixedly connected to the side wall of the communication outer cylinder 404 via the fixed shaft 425 .

[0062] See again Figure 4 The communication device 40 further includes a fixed upper joint 426, a fixed base 427 and a fixed lower joint 428. The fixed upper joint 426 is connected to one end of the communication outer tube 404, the other end of the communication outer tube 404 is connected to one end of the fixed base 427, and the other end of the fixed base 427 is connected to the fixed lower joint 428. The fixed base 427 is used to arrange the fixed claw base 408 to ensure the stability of the fixed claw base 408.

[0063] Exemplarily, the fixed lower joint 428 is connected to the fixed base 427 by threads, the fixed upper joint 426 is connected to the communication outer cylinder 404 by threads, and the communication outer cylinder 404 is connected to the fixed base 427 by threads.

[0064] Participate again Figure 4 There are two sealing rings 100 at the connection between the fixed upper joint 426 and the communication outer tube 404, and there are two sealing rings 100 at the connection between the fixed lower joint 428 and the fixed base 427.

[0065] In the embodiment of the present disclosure, when there is a fixed base 427 in the communication device 40 , the fixed claw base 408 can be fixed on the fixed base 427 , and the fixed base 427 has a through groove corresponding to the claw body 409 .

[0066] Participate again Figure 4 The communication device 40 further includes a motor sleeve 429 , which is located inside the communication outer sleeve 404 , and the motor 405 is located in the inner cavity of the motor sleeve 429 , providing space for the installation of the motor 405 .

[0067] Participate again Figure 4 The communication device 40 also includes a coupling 430 , and the transmission shaft 406 is connected to the motor 405 through the coupling 430 .

[0068] Figure 6 is a cross-sectional view of a second magnetic positioning module and a second wireless transmission module provided by an embodiment of the present disclosure. Figure 6The communication device 40 further includes a communication outer protective tube 416, a communication upper connector 418, an antenna protective cap 419, a communication circuit board frame 421, and a communication circuit board 422. The communication outer protective tube 416 has a communication outer protective tube cavity 417, and the communication upper connector 418 is sealed and connected to one end of the communication outer protective tube 416. The antenna protective cap 419 is sealed and connected to the other end of the communication outer protective tube 416, and the antenna protective cap 419 has a first mounting groove 420, and the first mounting groove 420 is connected to the communication outer protective tube cavity 417. The communication circuit board frame 421 is located in the communication outer protective tube cavity 417, and the communication circuit board 422 is mounted on the communication circuit board frame 421.

[0069] The communication upper connector 418 and the antenna protective cap 419 are respectively sealed and connected to the two ends of the communication outer protective tube 416 to prevent the liquid in the well from entering the communication outer protective tube cavity 417, so as to damage the communication circuit board 422 in the communication outer protective tube cavity 417. At the same time, a communication circuit board skeleton 421 is arranged in the communication outer protective tube cavity 417 to facilitate the installation of the communication circuit board 422. The communication circuit board 422 is electrically connected to the second wireless transmission module 403, and the communication circuit board 422 has a storage circuit for storing data received by the second wireless transmission module 403.

[0070] Exemplarily, the communication upper connector 418 and the communication outer protective tube 416 may be connected by threads, and the antenna protective cap 419 and the communication outer protective tube 416 may be connected by threads.

[0071] See again Figure 6 There are two sealing rings 100 at the connection between the communication upper connector 418 and the communication outer protective tube 416 , and there are two sealing rings 100 at the connection between the antenna protective cap 419 and the communication outer protective tube 416 .

[0072] See again Figure 6 The second wireless transmission module 403 includes: a first antenna fixing seat 423 and a first antenna 424. The first antenna fixing seat 423 is located in the first mounting groove 420, the first antenna 424 is installed on the first antenna fixing seat 423, and the first antenna 424 is electrically connected to the signal transceiver circuit in the communication circuit board 422.

[0073] In the embodiment of the present disclosure, since the first wireless transmission module 201 is the second antenna, the first antenna 424 performs wireless transmission with the second antenna to transmit the data monitored by the acquisition device 20 to the communication device 40. The first antenna fixing seat 423 is installed in the first installation groove 420. The space of the first installation groove 420 is small, which ensures the stability of the first antenna fixing seat 423 and prevents the first antenna fixing seat 423 from shaking.

[0074] Exemplarily, the first antenna 424 and the second antenna may perform wireless transmission via electromagnetic waves.

[0075] Figure 7 is a cross-sectional view of a connection module provided by an embodiment of the present disclosure. Figure 7 The communication device 40 may further include a connection module 412 , and the connection module 412 is connected to the transmission cable 50 .

[0076] See again Figure 7 The connection module 412 includes a fishing head 431, a connection tube 432 and a connection lower joint 433. The fishing head 431 and the connection lower joint 433 are respectively connected to two ends of the connection tube 432. The other end of the fishing head 431 is connected to the transmission cable 50.

[0077] See again Figure 7 The salvage head 431 is provided with saw teeth that cooperate with the saw teeth on the salvage tool. If the communication device 40 accidentally falls into the well, the saw teeth on the salvage tool and the saw teeth on the salvage head 431 can be used to salvage the communication device 40.

[0078] See again Figure 7 A protective spring 434 is arranged at one end of the salvage head 431 connected to the transmission cable 50. The transmission cable 50 will pass through the protective spring 434. The protective spring 434 protects the transmission cable 50 to prevent the transmission cable 50 from bending at too large an angle and causing damage to the transmission cable 50.

[0079] See again Figure 7 , the connection module 412 further includes an outer cone sleeve 435, an inner cone sleeve 436 and a locking nut 437. The outer cone sleeve 435 is threadedly connected to the fishing head 431, the inner cavity of the outer cone sleeve 435 is truncated cone-shaped, the outer surface of the inner cone sleeve 436 is also truncated cone-shaped, the inner cone sleeve 436 is located in the inner cavity of the outer cone sleeve 435, and the locking nut 437 is threadedly connected to the inner cone sleeve 436. The inner cone sleeve 436 and the locking nut 437 both have inner cavities and are interconnected. The transmission cable 50 passes through the inner cavity of the fishing head 431, the inner cavity of the inner cone sleeve 436 and the inner cavity of the locking nut 437 in sequence. The transmission cable 50 is arranged with a rubber sleeve 438 at the other end of the locking nut 437. The rubber sleeve 438 includes the inner core of the transmission cable 50, so that the diameter of the transmission cable 50 becomes larger. When the transmission cable 50 is pulled up, the transmission cable 50 where the rubber sleeve 438 is located is stuck in the locking nut 437, so that the locking nut 437 moves upward with the inner cone sleeve 436, so that the outer surface of the inner cone sleeve 436 is against the inner cavity of the outer cone sleeve 435, thereby connecting the transmission cable 50 with the connection module 412.

[0080] See again Figure 7 The connection module 412 also includes a sealing plug, which blocks the connection between the lower connector 433 and the connection tube 432 to prevent liquid from entering the inner cavity of the connection tube 432.

[0081] Figure 8 is a cross-sectional view of a weighting module provided by an embodiment of the present disclosure. Figure 8 The communication device 40 further includes: a weighting module 413, which is connected between the connecting module 412 and the fixing module 401. The fixing upper connector 426 is connected to the weighting module 413, thereby connecting the weighting module 413 to the fixing module 401.

[0082] Due to the high pressure underground, when the communication device 40 is lowered, it may be unable to move downward, causing the communication device 40 to be unable to reach the target layer. A weighting module 413 is arranged in the communication device 40 to facilitate the downward movement of the communication device 40.

[0083] See again Figure 8 The weighting module 413 includes: a weighting rod outer protective tube 414 and a tungsten core 415. The weighting rod outer protective tube 414 has a weighting outer protective tube cavity. The tungsten core 415 is located in the weighting outer protective tube cavity.

[0084] In the disclosed embodiment, the density of the tungsten core 415 is relatively high, which can increase the weight of the communication device 40. The weight rod outer protective tube 414 protects the tungsten core 415 to prevent the tungsten core 415 from colliding with the well wall and causing damage to the tungsten core 415.

[0085] See again Figure 8 The weighting module 413 further includes a weighting upper joint 439 and a weighting lower joint 440, which are respectively connected to the two ends of the weighting outer protective tube cavity. The weighting upper joint 439 is connected to the connecting lower joint 433, and the weighting lower joint 440 is connected to the fixed upper joint 426.

[0086] Exemplarily, the weighted upper joint 439 is connected to the weighted rod outer protective tube 414 by threads, and the weighted lower joint 440 is connected to the weighted rod outer protective tube 414 by threads.

[0087] See again Figure 8 There are two sealing rings 100 at the connection between the weighted upper joint 439 and the outer protective tube 414 of the weighted rod, and there are two sealing rings 100 at the connection between the weighted lower joint 440 and the outer protective tube 414 of the weighted rod.

[0088] See again Figure 8 The weighting module 413 further includes a fixing seat 441 , and the fixing seat 441 and the weighting lower joint 440 are respectively against two ends of the tungsten core 415 to ensure the stability of the tungsten core 415 .

[0089] In the disclosed embodiment, the salvage head 431 is connected to the transmission cable 50 , the connecting lower joint 433 is connected to the weighted upper joint 439 , the weighted lower joint 440 is connected to the fixed upper joint 426 , and the fixed lower joint 428 is connected to the communication upper joint 418 .

[0090] See again Figures 4 to 8 The communication device 40 further includes a single-core plug 442, a plug pad 443 and a single-core socket 444. The end of the connecting lower connector 433, the end of the weighted lower connector 440 and the end of the fixed lower connector 428 all have a single-core plug 442 and a plug pad 443. The end of the weighted upper connector 439, the end of the fixed upper connector 426 and the end of the communication upper connector 418 all have a single-core socket 444. The single-core plug 442 is inserted into the single-core socket 444, thereby connecting the connecting lower connector 433 with the weighted upper connector 439, the weighted lower connector 440 with the fixed upper connector 426, and the fixed lower connector 428 with the communication upper connector 418. The plug pad 443 is located between the single-core plug 442 and the single-core socket 444, and plays a buffering role.

[0091] In the embodiment of the present disclosure, the connection module 412, the weighting module 413 and the fixing module 401 all have inner cavities and are interconnected, so as to facilitate routing through the inner cavities to connect the transmission cable 50 and the communication circuit board.

[0092] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A pipe string load monitoring system for monitoring the load of a pipe string (10), characterized in that: The pipe string load monitoring system comprises: A plurality of collection devices (20), each collection device (20) being located between two adjacent sections of the plurality of pipe strings (10), the collection device (20) comprising a first wireless transmission module (201) and a first magnetic positioning module (202); A surface receiving device (30) located outside the well; A communication device (40) is located in the well, wherein the communication device (40) comprises a fixing module (401), a second magnetic positioning module (402) and a second wireless transmission module (403); a transmission cable (50), one end of which is electrically connected to the communication device (40), and the other end of which is electrically connected to the ground receiving device (30), the transmission cable (50) being used to drive the communication device (40) to move up and down in the well under power control; Wherein, the second magnetic positioning module (402) is used to send a positioning success signal to the ground receiving device (30) when it is aligned with the first magnetic positioning module (202); the ground receiving device (30) is used to send a control signal to the fixing module (401) when receiving the positioning success signal, so as to control the fixing module (401) to be fixed on the acquisition device (20); the ground receiving device (30) is also used to send a connection signal to the second wireless transmission module (403) when receiving the positioning success signal; the second wireless transmission module (403) is used to communicate with the first wireless transmission module (201) when receiving the connection signal, so as to obtain the pipe string monitoring data collected by the acquisition device (20), and transmit the data to the ground receiving device (30) through the transmission cable (50); The fixing module (401) is a retractable fixing claw, the top of the collection device (20) is provided with a fixing platform (203), and the retractable fixing claw is fixed on the fixing platform (203) under the control of the control signal; The communication device (40) has a cylindrical communication outer cylinder (404); The retractable fixing claw comprises: A motor (405) electrically connected to one end of the transmission cable (50), the motor (405) being located in the inner cavity of the communication outer cylinder (404); A transmission shaft (406) extends along a first direction, one end of the transmission shaft (406) is connected to the output shaft of the motor (405), and the transmission shaft (406) can rotate around the center line of the transmission shaft (406), and the first direction is the length direction of the communication outer cylinder (404); A cam (407) is sleeved on the other end of the transmission shaft (406), and the axle of the cam (407) extends along the first direction; A fixed claw base (408) is fixed in the inner cavity of the communication outer cylinder (404), and a through hole extending along the second direction is provided in the middle of the fixed claw base (408); Two claw bodies (409), along the second direction, the two claw bodies (409) are respectively located on both sides of the fixed claw base (408), the middle parts of the two claw bodies (409) close to the first end are hinged to the fixed claw base (408), the rotation axes (410) of the two claw bodies (409) extend along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; at least a part of the cam (407) is located between the first ends of the two claw bodies (409); A compression spring (411), wherein the middle portion of the compression spring (411) is located in the through hole, and the two ends of the compression spring (411) are respectively connected to the middle portions of the two claw bodies (409).

2. The pipe string load monitoring system according to claim 1, characterized in that: The collection device (20) further includes a power supply (204); The first magnetic positioning module (202) is a reed switch; When the distance between the second magnetic positioning module (402) and the reed switch is less than a first threshold, the reed switch conducts electricity between the first wireless transmission module (201) and the power source (204).

3. The pipe string load monitoring system according to claim 1, characterized in that: The collection device (20) further comprises: A collecting outer cylinder (205) extending along the length direction of the pipe string (10); A flow tube (206) extends along the length direction of the pipe column (10); the flow tube (206) is located inside the collection outer cylinder (205); a sealed annular installation cavity (207) is provided between the flow tube (206) and the collection outer cylinder (205); and the first wireless transmission module (201) and the first magnetic positioning module (202) are both located inside the annular installation cavity (207).

4. The pipe string load monitoring system according to claim 3, characterized in that: The annular installation cavity (207) is an eccentric annular installation cavity.

5. The pipe string load monitoring system according to claim 3, characterized in that: The collection device (20) further comprises: A cylindrical collecting upper base (208), one end of which is respectively connected to the outer wall of the flow tube (206) and the inner wall of the collecting outer cylinder (205); A tension connection tube (209), one end of which is connected to the other end of the collection upper substrate (208); A cylindrical collecting upper joint (210) connected to the other end of the tension connection tube (209); A temperature and pressure sensor (211) is located in the annular installation cavity (207); the temperature and pressure sensor (211) is electrically connected to the first wireless transmission module (201).

6. The pipe string load monitoring system according to claim 1, characterized in that: The communication device (40) further comprises: A connection module (412) connected to the transmission cable (50); The weighting module (413) is connected between the connecting module (412) and the fixing module (401).

7. The pipe string load monitoring system according to claim 6, characterized in that: The weighting module (413) comprises: A weighted rod outer protective tube (414) having a weighted outer protective tube cavity; The tungsten core (415) is located in the cavity of the weighted outer protective tube.

8. The pipe string load monitoring system according to claim 1, characterized in that: The communication device (40) comprises: A communication outer protective tube (416) having a communication outer protective tube cavity (417); A communication upper connector (418) sealed and connected to one end of the communication outer protective tube (416); An antenna protective cap (419) is sealed and connected to the other end of the communication outer protective tube (416); the antenna protective cap (419) has a first mounting groove (420); the first mounting groove (420) is in communication with the communication outer protective tube cavity (417); A communication circuit board skeleton (421) is located in the communication outer protective tube cavity (417); A communication circuit board (422) mounted on the communication circuit board frame (421); The second wireless transmission module (403) comprises: A first antenna fixing seat (423), located in the first mounting groove (420); A first antenna (424) is mounted on the first antenna fixing seat (423); the first antenna (424) is electrically connected to the communication circuit board (422).

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