Anti-collision instrument for drilling detection based on the principle of static magnetometry

Abstract

The present invention relates to the field of measurement while drilling technology, and is a detection and collision prevention instrument for drilling while drilling based on the principle of static magnetometry, which includes a downhole measurement probe, a rectifier-encoded driving short section, and a high-power pulse generator, wherein the downhole measurement probe includes an upper joint, a first pressure-resistant tube, a lower joint, a shock-absorbing support assembly, a first circuit board skeleton, a central connector, and a stop shaft. The present invention has a reasonable and compact structure and is easy to use. The disturbance of the casing of an adjacent well to the earth's magnetic field is measured by the downhole measurement probe and the rectifier-encoded driving short section, and the mud pulse is generated by the high-power pulse generator to upload the measurement data to the ground receiving system, and then the relative distance and orientation between the two wells are calculated by the ground decoding system, thereby guiding the anti-collision operation of cluster wells, eliminating the influence of the ellipsoid error caused by the magnetic field strength of the casing of the adjacent wells in the cluster wells and the accuracy of the inclinometer, and providing a new technical means for cluster well anti-collision, which has the characteristics of accuracy, stability, and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of while drilling measurement, and is a while drilling detection and anti-collision instrument based on the static magnetometry measurement principle. Background Art

[0002] At present, cluster well drilling technology has become one of the indispensable technologies for the exploration and development of special oil and gas reservoir resources such as heavy oil and high-condensate oil. However, for dense cluster wells, due to the small spacing between wellheads, the drilling quality of the vertical well section before deflection is extremely high. To ensure the quality of the vertical well section, a key technology is anti-collision. Visualization technology is usually used to track and monitor the wellbore trajectory on site. Visual drilling technology mainly uses the wellbore trajectory parameters of the drilling well and the drilled adjacent well measured by the inclinometer, combined with the anti-collision scanning method and the calculation method of the wellbore trajectory to predict the collision trend of the lower wellbore, and take measures to bypass obstacles when the relative distance is less than the safe distance, so as to avoid the occurrence of wellbore collision accidents. However, this method depends on the data accuracy of the inclinometer. When the well spacing between the wellheads of the cluster wells is small, the magnetic field strength of the casing of the vertical well section of the adjacent well is very easy to interfere with the inclinometer, and the measurement error of the instrument itself will also affect the data. At the same time, this method cannot eliminate the accumulated error in the measurement process. In view of this, how to determine the relative spatial position between the well being drilled and the drilled adjacent wells in a cluster well and effectively guide the anti-collision operation has become an urgent problem that needs to be solved. Summary of the invention

[0003] The present invention provides a collision-avoiding instrument for detecting while drilling based on the principle of static magnetometry, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of ellipsoid error caused by the magnetic field strength of the casing of adjacent wells in cluster wells and the accuracy of the inclinometer.

[0004] The technical solution of the present invention is achieved through the following measures: a downhole detection and anti-collision instrument based on the principle of static magnetometry includes a downhole measuring probe, a rectifier encoding drive short section and a high-power pulse generator. The downhole measuring probe includes an upper joint, a first pressure-resistant tube, a lower joint, a shock-absorbing support assembly, a first circuit board frame, a central connector and a stop shaft. The outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the first pressure-resistant tube, the inner side of the lower end of the first pressure-resistant tube is fixedly installed with the outer side of the upper end of the lower joint, the first pressure-resistant tube is provided with a first circuit board frame, the first circuit board frame is provided with an anti-collision module capable of collecting wellbore trajectory data being drilled and measuring the magnetic field strength of the casing of the adjacent well, the upper joint can be provided with a shock-absorbing support assembly capable of supporting and limiting the upper end of the first circuit board frame, the lower end of the first circuit board frame is fixedly installed with a central connector with a lower end located above the lower end of the first pressure-resistant tube, and the lower joint is provided with a key connection with an upper end located above the first anti- The anti-rotation shaft in the pressure cylinder, the upper end of the anti-rotation shaft is fixedly installed together with the lower end of the center connector; the rectifier encoding drive short section includes a conversion joint, a second anti-pressure cylinder, an outer protective tube, a straightening joint, a third anti-pressure cylinder, a second circuit board frame, a first connecting assembly, a third circuit board frame and a second connecting assembly, the lower end of the lower joint is fixedly installed together with the upper end of the conversion joint, the outer side of the lower end of the conversion joint is fixedly installed together with the inner side of the upper end of the second anti-pressure cylinder, the outer side of the lower end of the second anti-pressure cylinder is fixedly installed together with the outer side of the upper end of the straightening joint through the outer protective tube, the outer side of the lower end of the straightening joint is fixedly installed together with the inner side of the upper end of the third anti-pressure cylinder, the second anti-pressure cylinder is provided with a second circuit board frame, the second circuit board frame and the straightening joint are provided with a first connecting assembly, the third anti-pressure cylinder is provided with a third circuit board frame, the third anti-pressure cylinder corresponding to the position below the third circuit board frame is provided with a second connecting assembly, and a high-power pulse generator is fixedly installed at the lower end of the third pressure-bearing cylinder.

[0005] The following are further optimizations and / or improvements to the above technical solutions:

[0006] The above-mentioned anti-collision module may include a wellbore trajectory acquisition module, a magnetic field acquisition control module and a central control communication module. A first rectifier and voltage regulator module is provided on the second circuit board skeleton, and a second rectifier and voltage regulator module is provided on the third circuit board skeleton. The wellbore trajectory acquisition module and the magnetic field acquisition control module are respectively connected to the central control communication module, the central control communication module is connected to the first rectifier and voltage regulator module, the first rectifier and voltage regulator module is connected to the second rectifier and voltage regulator module, and the second rectifier and voltage regulator module is connected to a high-power pulse generator.

[0007] The magnetic field acquisition control module may include a magnetic field acquisition circuit, a digital signal processing unit and a fluxgate drive circuit. The magnetic field acquisition circuit includes three acquisition sub-circuits and a field programmable logic array. Each acquisition sub-circuit includes a fluxgate sensor, a bandpass filter, a gain circuit and a digital-to-analog converter connected in sequence. The fluxgate sensor is excited by the fluxgate drive circuit. Each acquisition sub-circuit is used to respectively acquire and process the magnetic flux of the X, Y and Z axes. The field programmable logic array is used to store the signals obtained after processing by the three acquisition sub-circuits as sampled waveform data; the digital signal processing unit is used to perform digital bandpass filtering on the sampled waveform data, perform digital phase-sensitive detection on the filtered signal obtained by the digital bandpass filtering, perform digital integration on the waveform data after the digital phase-sensitive detection, and perform digital low-pass filtering and amplitude extraction on the waveform data obtained by the digital integration to obtain the magnetic field intensity.

[0008] The first rectifying and voltage stabilizing module and the second rectifying and voltage stabilizing module may each include a decoding chip, a diode, a field effect transistor driving circuit, a comparison circuit, a phase-locked loop demodulator, a voltage protection circuit and a capacitive coupling transformer connected in sequence.

[0009] The above-mentioned shock-absorbing support assembly may include a tensioning screw, a tensioning pressure plate, an expansion ring, a steel ball, a tensioning bolt, a tensioning nut and a limiting disc spring. A tensioning screw is arranged in the upper joint, and at least two mounting holes are distributed along the circumference of the outer side of the lower part of the upper joint corresponding to the lower position of the tensioning screw. A first inner ring groove is arranged on the inner side of the upper part of the first pressure-resistant cylinder corresponding to the mounting hole position, and an expansion ring is arranged in the first inner ring groove. A steel ball with an inner end located in the upper joint is arranged in the mounting hole. An extrusion ring platform is arranged on the outer side of the lower end of the tensioning screw corresponding to the position below the mounting hole. The tensioning screw is provided with a mounting cavity which passes through from top to bottom. A second inner ring groove is provided on the inner side of the lower end of the rod, and a tensioning bolt with an upper end located in the mounting cavity is provided in the second inner ring groove, a first outer ring platform is provided on the outer side of the lower end of the tensioning bolt, a limiting disc spring is provided on the outer side of the tensioning bolt corresponding to the position between the upper end of the first outer ring platform and the upper end of the first inner ring groove, a third inner ring groove is provided on the outer side of the upper part of the first outer ring platform, a retaining ring is provided in the third inner ring groove, a tensioning pressure plate fixedly installed with the lower end of the extrusion ring platform is provided on the outer side of the tensioning bolt corresponding to the position below the third inner ring groove, and a tensioning nut is fixedly installed on the outer side of the lower end of the tensioning bolt corresponding to the position below the tensioning pressure plate.

[0010] The above-mentioned first connecting component may include a first skeleton connector, a first rubber shock-absorbing joint, a first connector gland and a first Ramer connector seat. The inner side of the lower end of the second pressure-resistant cylinder is provided with a first skeleton connector installed together with the second circuit board skeleton. The lower end of the first skeleton connector is plugged into the first rubber shock-absorbing joint by interference fit. The first connecting gland is fixedly installed on the outer side of the lower end of the first rubber shock-absorbing joint. The first Ramer connector seat with the upper end located therein is limitedly installed on the inner side of the lower end of the first connecting gland; the second connecting component includes a second skeleton connector, a second rubber shock-absorbing joint, a second connector gland and a second Ramer connector seat. The inner side of the lower end of the third pressure-resistant cylinder is provided with a second skeleton connector installed together with the third circuit board skeleton. The lower end of the second skeleton connector is plugged into the second rubber shock-absorbing joint by interference fit. The second connecting gland is fixedly installed on the outer side of the lower end of the second rubber shock-absorbing joint. The second Ramer connector seat with the upper end located therein is limitedly installed on the inner side of the lower end of the second connecting gland.

[0011] The above may also include a shock-absorbing assembly, which includes an aluminum card gasket, an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket. The upper end of the upper joint is provided with an aluminum card gasket whose lower end is located inside the upper joint. The upper side of the aluminum card gasket is fixedly installed with an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket in sequence from top to bottom.

[0012] The above-mentioned can also include a centralizer rib plate, and the centralizer rib plate is fixedly installed on the outer side of the middle part of the centralizing joint.

[0013] The invention has a reasonable and compact structure and is easy to use. The invention measures the disturbance of the casing of the adjacent well to the geomagnetic field through the downhole measuring probe and the rectifier encoding driving short section, generates mud pulses through a high-power pulse generator to upload the measured data to the ground receiving system, and then the ground decoding system calculates the relative distance and orientation between the two wells, thereby guiding the cluster well collision prevention operation, eliminating the influence of the ellipsoid error caused by the magnetic field strength of the casing of the adjacent well in the cluster well and the accuracy of the inclinometer, and providing a new technical means for cluster well collision prevention, which has the characteristics of accuracy, stability and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the main structure of the best embodiment of the present invention.

[0015] Attached Figure 2 For attachment Figure 1 Schematic diagram of the cross-sectional structure of the upper half of the downhole measuring probe.

[0016] Attached Figure 3 For attachment Figure 1 Schematic diagram of the cross-sectional structure of the lower half of the downhole measuring probe.

[0017] Attached Figure 4 For attachment Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] Attached Figure 5 For attachment Figure 1 Schematic diagram of the cross-sectional structure of the upper half of the medium rectifier encoding drive short section.

[0019] Attached Figure 6 For attachment Figure 1 Schematic diagram of the cross-sectional structure of the lower half of the medium rectifier encoding drive short section.

[0020] The codes in the attached drawings are: 1 is an upper joint, 2 is a first pressure-resistant cylinder, 3 is a lower joint, 4 is a first circuit board frame, 5 is a central connector, 6 is a stop shaft, 7 is a conversion joint, 8 is a second pressure-resistant cylinder, 9 is an outer protective tube, 10 is a straightening joint, 11 is a third pressure-resistant cylinder, 12 is a second circuit board frame, 13 is a third circuit board frame, 14 is a tensioning screw, 15 is a tensioning pressure plate, 16 is an expansion ring, 17 is a steel ball, 18 is a tensioning bolt, 19 is a tensioning nut, 20 is a limit disc spring, 21 is a mounting hole, 22 is an extrusion ring platform, 23 is a mounting cavity, 24 is a first inner ring groove, 25 is a second inner ring groove, 26 is a third inner ring groove, 27 is a first skeleton connector, 28 is a first rubber shock-absorbing joint, 29 is a first connector gland, 30 is a first Lemo connector seat, 31 is an upper shock-absorbing gasket, 32 is a metal gasket, 33 is a lower shock-absorbing gasket, 34 is an aluminum card gasket, 35 is a centralizer rib, and 36 is a high-power pulse generator. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with embodiments and drawings:

[0024] As attached Figure 1 , 2As shown in , 3, 4, 5, and 6, the anti-collision instrument for detection while drilling based on the principle of static magnetometry includes a downhole measuring probe, a rectifier encoding drive short section and a high-power pulse generator 36. The downhole measuring probe includes an upper joint 1, a first pressure-resistant tube 2, a lower joint 3, a shock-absorbing support assembly, a first circuit board skeleton 4, a central connector 5 and a stop shaft 6. The outer side of the lower end of the upper joint 1 is fixedly installed with the inner side of the upper end of the first pressure-resistant tube 2, the inner side of the lower end of the first pressure-resistant tube 2 is fixedly installed with the outer side of the upper end of the lower joint 3. The first pressure-resistant tube 2 is provided with a first circuit board skeleton 4. The first circuit board skeleton 4 is provided with an anti-collision module capable of collecting borehole trajectory data of the well being drilled and measuring the magnetic field strength of the casing of the adjacent well. The upper joint 1 can be provided with a shock-absorbing support assembly capable of supporting and limiting the upper end of the first circuit board skeleton 4. The lower end of the first circuit board skeleton 4 is fixedly installed with a central connector 5 with a lower end located above the lower end of the first pressure-resistant tube 2. The lower joint 3 is provided with a stop shaft 6 with an upper end located in the first pressure-resistant tube 2 through a key connection. The upper end of the stop shaft 6 It is fixedly installed together with the lower end of the center connector 5; the rectifier encoding drive short section includes a conversion joint 7, a second anti-pressure cylinder 8, an outer protective tube 9, a straightening joint 10, a third anti-pressure cylinder 11, a second circuit board frame 12, a first connecting component, a third circuit board frame 13 and a second connecting component, the lower end of the lower joint 3 is fixedly installed together with the upper end of the conversion joint 7, the outer side of the lower end of the conversion joint 7 is fixedly installed together with the inner side of the upper end of the second anti-pressure cylinder 8, the outer side of the lower end of the second anti-pressure cylinder 8 is fixedly installed together with the outer side of the upper end of the straightening joint 10 through the outer protective tube 9, the outer side of the lower end of the straightening joint 10 is fixedly installed together with the inner side of the upper end of the third anti-pressure cylinder 11, the second anti-pressure cylinder 8 is provided with a second circuit board frame 12, the second circuit board frame 12 and the straightening joint 10 are provided with a first connecting component, the third anti-pressure cylinder 11 is provided with a third circuit board frame 13, the third anti-pressure cylinder 11 corresponding to the position below the third circuit board frame 13 is provided with a second connecting component, and a high-power pulse generator 36 is fixedly installed at the lower end of the third pressure-bearing cylinder. During use, the downhole measuring probe is used to collect the borehole trajectory data of the well being drilled, including the well inclination angle and the well inclination azimuth, and can also measure the magnetic field strength of the casing of the adjacent well, and transmit these measured information in the form of electrical signals through the communication line to the rectifier coding drive short section. The control codec module in the rectifier coding drive short section controls the high-power pulse generator 36 in the form of electrical signals, so that it sends mud pulses corresponding to the data measured by the downhole measuring probe. The present invention directly measures the magnetic parameters of the casing of the adjacent well, improves the accuracy of the anti-collision operation, and reduces the risk of collision between the two wells.

[0025] According to the needs, the upper joint 1 and the lower joint 3 are respectively connected to the two ends of the first pressure-resistant tube 2 through threads. The connecting threads can be selected according to the actual situation downhole. Ordinary threads or trapezoidal threads that comply with national standards can also be selected as American unified threads. Through holes with different inner diameters are formed inside the upper joint 1, the first pressure-resistant tube 2 and the lower joint 3 by turning, which are used to place internal parts such as the first circuit board skeleton 4. Among them, the upper joint 1 and the lower joint 3 are made of high manganese nickel-chrome stainless steel material, and the first pressure-resistant tube 2 is made of non-magnetic titanium alloy material to isolate the external mud from contact with the anti-collision module, and protect the first anti-circuit board skeleton and the anti-collision module arranged thereon from external loads such as bending and extrusion.

[0026] According to actual needs, the above-mentioned anti-collision instrument for detection while drilling based on the principle of static magnetometry can be further optimized and / or improved:

[0027] As attached Figure 1 , 2 As shown in , 3, 4, 5, and 6, the anti-collision module includes a borehole trajectory acquisition module, a magnetic field acquisition control module, and a central control communication module. The second circuit board skeleton 12 is provided with a first rectifier and voltage regulator module, and the third circuit board skeleton 13 is provided with a second rectifier and voltage regulator module. The borehole trajectory acquisition module and the magnetic field acquisition control module are respectively connected to the central control communication module, and the central control communication module is connected to the first rectifier and voltage regulator module, the first rectifier and voltage regulator module is connected to the second rectifier and voltage regulator module, and the second rectifier and voltage regulator module is connected to the high-power pulse generator 36. In use, through such a setting, the borehole trajectory data of the well being drilled is collected, and the magnetic field strength of the casing of the adjacent well can also be measured.

[0028] As attached Figure 1 , 2 As shown in , 3, 4, 5, and 6, the magnetic field acquisition control module includes a magnetic field acquisition circuit, a digital signal processing unit, and a fluxgate drive circuit. The magnetic field acquisition circuit includes three acquisition subcircuits and a field programmable logic array. Each acquisition subcircuit includes a fluxgate sensor, a bandpass filter, a gain circuit, and a digital-to-analog converter connected in sequence. The fluxgate sensor is excited by the fluxgate drive circuit. Each acquisition subcircuit is used to respectively acquire and process the magnetic flux of the X, Y, and Z axes. The field programmable logic array is used to store the signals obtained after the three acquisition subcircuits are processed as sampling waveform data; the digital signal processing unit is used to perform digital bandpass filtering on the sampling waveform data, perform digital phase-sensitive detection on the filtered signal obtained by the digital bandpass filtering, perform digital integration on the waveform data after digital phase-sensitive detection, and perform digital low-pass filtering and amplitude extraction on the waveform data obtained by digital integration to obtain the magnetic field intensity. During use, through such a setting, the borehole trajectory data of the drilling well collected by the downhole measurement probe and the measured magnetic field intensity of the casing of the adjacent well are transmitted downward to the rectifier encoding drive short section.

[0029] As attached Figure 1 , 2 As shown in , 3, 4, 5, and 6, the first rectifier and voltage regulator module and the second rectifier and voltage regulator module each include a decoder chip, a diode, a field effect transistor drive circuit, a comparison circuit, a phase-locked loop demodulator, a voltage protection circuit, and a capacitor coupling transformer connected in sequence. During use, through such a setting, the rectifier encoding drive short section controls the high-power pulse generator 36 in the form of an electrical signal, so that it sends a mud pulse corresponding to the data measured by the downhole measurement probe.

[0030] As attached Figure 1 , 2As shown in Figures 3, 4, 5 and 6, the shock-absorbing support assembly includes a tensioning screw 14, a tensioning pressure plate 15, an expansion ring 16, a steel ball 17, a tensioning bolt 18, a tensioning nut 19 and a limiting disc spring 20. The upper joint 1 is provided with a tensioning screw 14, and at least two mounting holes 21 are distributed along the circumference of the lower outer side of the upper joint 1 corresponding to the lower position of the tensioning screw 14. A first inner ring groove 24 is provided on the inner side of the upper part of the first pressure-resistant cylinder 2 corresponding to the position of the mounting hole 21, and an expansion ring 16 is provided in the first inner ring groove 24. A steel ball 17 with an inner end located in the upper joint 1 is provided in the mounting hole 21, and an extrusion ring 22 is provided on the outer side of the lower end of the tensioning screw 14 corresponding to the position below the mounting hole 21. The tensioning screw 14 is provided with a through-and-through The mounting cavity 23 is provided with a second inner ring groove 25 on the inner side of the lower end of the tensioning screw 14, and a tensioning bolt 18 with an upper end located in the mounting cavity 23 is provided in the second inner ring groove 25. A first outer ring platform is provided on the outer side of the lower end of the tensioning bolt 18, and a limiting disc spring 20 is provided on the outer side of the tensioning bolt 18 corresponding to the position between the upper end of the first outer ring platform and the upper end of the first inner ring groove 24. A third inner ring groove 26 is provided on the outer side of the upper part of the first outer ring platform, and a retaining ring is provided in the third inner ring groove 26. A tensioning pressure plate 15 fixedly installed with the lower end of the extrusion ring platform 22 is provided on the outer side of the tensioning bolt 18 corresponding to the position below the third inner ring groove 26, and a tensioning nut 19 is fixedly installed on the outer side of the lower end of the tensioning bolt 18 corresponding to the position below the tensioning pressure plate 15. During use, by setting the tensioning screw 14, pressure is applied to the first circuit board skeleton 4 and a self-locking effect is achieved; by setting the tensioning pressure plate 15, the limit disc spring 20 is conveniently fixed in the second inner ring groove 25, and the limit disc spring 20 is compressed to have an initial pre-tightening force, so as to improve the vibration resistance level of the downhole measuring probe; by setting three steel balls 17 and the expansion ring 16, the expansion ring 16 can be an existing well-known open ring, which plays a self-locking role. After the downhole measuring probe is tested and qualified on the vibration test bench, it is tightened by rotating clockwise with a special wrench. The bolt 18 and the steel ball 17 move from the outer side of the middle part of the tensioning screw 14 to the outer side of the extrusion ring 22, so that the diameter of the expansion ring 16 increases under the thrust of the steel ball 17 and enters the first inner ring groove 24 to achieve self-locking, so that the first circuit board skeleton 4 is always compressed under the strong vibration of the downhole measuring probe; in addition, the tensioning bolt 18 is rotated counterclockwise with a special wrench, and the steel ball 17 moves from the outer side of the extrusion ring 22 to the outer side of the middle part of the tensioning screw 14, and the expansion ring 16 returns to its original diameter and comes out of the first inner ring groove 24, releasing the self-locking.

[0031] As attached Figure 1 , 2As shown in , 3, 4, 5, and 6, the first connecting component includes a first skeleton connector 27, a first rubber shock-absorbing joint 28, a first connector gland 29, and a first Ramo connector seat 30. The inner side of the lower end of the second pressure-resistant cylinder 8 is provided with a first skeleton connector 27 installed together with the second circuit board skeleton 12. The lower end of the first skeleton connector 27 is plugged into the first rubber shock-absorbing joint 28 by interference fit. The first connecting gland is fixedly installed on the outer side of the lower end of the first rubber shock-absorbing joint 28. The first Ramo connector seat 30 with the upper end located therein is limitedly installed on the inner side of the lower end of the first connecting gland; the second connecting component includes a second skeleton connector, a second rubber shock-absorbing joint, a second connector gland, and a second Ramo connector seat. The inner side of the lower end of the third pressure-resistant cylinder 11 is provided with a second skeleton connector installed together with the third circuit board skeleton 13. The lower end of the second skeleton connector is plugged into the second rubber shock-absorbing joint by interference fit. The second connecting gland is fixedly installed on the outer side of the lower end of the second rubber shock-absorbing joint. The second Ramo connector seat with the upper end located therein is limitedly installed on the inner side of the lower end of the second connecting gland. During use, this setting can enhance the stability of signal transmission and ensure high-quality communication between different circuits.

[0032] As attached Figure 1 , 2 , 3, 4, 5, and 6, it also includes a shock absorbing component, which includes an aluminum card gasket 34, an upper shock absorbing gasket 31, a metal gasket 32, and a lower shock absorbing gasket 33. The upper end of the upper connector 1 is provided with an aluminum card gasket 34 whose lower end is located inside the upper connector 1, and the upper side of the aluminum card gasket 34 is fixedly installed with an upper shock absorbing gasket 31, a metal gasket 32, and a lower shock absorbing gasket 33 in sequence from top to bottom. During use, through such a setting, the shock absorbing effect of the present invention is enhanced to ensure high-quality communication between different circuits.

[0033] As attached Figure 1 , 2 , 3, 4, 5, and 6, it also includes a centralizer rib 35, and the centralizer rib 35 is fixedly installed on the outer side of the middle of the centralizing joint 10. The centralizing joint 10 plays a role in centering the instrument string and improving the accuracy of downhole data measurement. The centralizing joint 10 is connected to the centralizer rib 35 by screws. The centralizer rib 35 is made of titanium alloy and rubber. The surface of the titanium alloy rubber needs to be sandblasted, and the bonding strength between rubber and metal is greater than 3.7MPa.

[0034] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A drilling detection and anti-collision instrument based on the principle of static magnetometry, characterized in that The downhole measuring probe comprises a downhole measuring probe, a rectifier encoding driving short section and a high-power pulse generator. The downhole measuring probe comprises an upper joint, a first pressure-resistant tube, a lower joint, a shock-absorbing support assembly, a first circuit board frame, a central connector and a rotation-stopping shaft. The outer side of the lower end of the upper joint is fixedly mounted together with the inner side of the upper end of the first pressure-resistant tube, the inner side of the lower end of the first pressure-resistant tube is fixedly mounted together with the outer side of the upper end of the lower joint, the first pressure-resistant tube is provided with a first circuit board frame, and the first circuit board frame is provided with an anti-collision module capable of collecting wellbore trajectory data being drilled and measuring the magnetic field strength of the casing of an adjacent well. The upper joint can be provided with a shock-absorbing support assembly that can support and limit the upper end of the first circuit board frame, and the lower end of the first circuit board frame is fixedly installed with a central connector whose lower end is located above the lower end of the first pressure-resistant cylinder, and the lower joint is provided with a stop shaft whose upper end is located in the first pressure-resistant cylinder through a key connection, and the upper end of the stop shaft is fixedly installed with the lower end of the central connector; the rectifier coding drive short section includes a conversion joint, a second pressure-resistant cylinder, an outer protective tube, a straightening joint, a third pressure-resistant cylinder, a second circuit board frame, a first connecting assembly, a third circuit board frame and a second connecting assembly, and the lower The lower end of the joint is fixedly installed together with the upper end of the conversion joint, the outer side of the lower end of the conversion joint is fixedly installed together with the inner side of the upper end of the second pressure-resistant cylinder, the outer side of the lower end of the second pressure-resistant cylinder is fixedly installed together with the outer side of the upper end of the straightening joint through an outer protective tube, the outer side of the lower end of the straightening joint is fixedly installed together with the inner side of the upper end of the third pressure-resistant cylinder, a second circuit board skeleton is provided in the second pressure-resistant cylinder, the second circuit board skeleton and the straightening joint are provided with a first connecting component, a third circuit board skeleton is provided in the third pressure-resistant cylinder, a second connecting component is provided in the third pressure-resistant cylinder corresponding to the position below the third circuit board skeleton, and a high-power pulse generator is fixedly installed at the lower end of the third pressure-bearing cylinder; the anti-collision module includes a wellbore trajectory acquisition module, a magnetic field acquisition control module and a central control communication module, a first rectifier and voltage regulator module is provided on the second circuit board skeleton, a second rectifier and voltage regulator module is provided on the third circuit board skeleton, the wellbore trajectory acquisition module and the magnetic field acquisition control module are respectively connected to the central control communication module, the central control communication module is connected to the first rectifier and voltage regulator module, the first rectifier and voltage regulator module is connected to the second rectifier and voltage regulator module, and the second rectifier and voltage regulator module is connected to the high-power pulse generator;The shock-absorbing support assembly includes a tensioning screw, a tensioning pressure plate, an expansion ring, a steel ball, a tensioning bolt, a tensioning nut and a limiting disc spring. A tensioning screw is arranged in the upper joint. At least two mounting holes are distributed along the circumference of the lower outer side of the upper joint corresponding to the lower position of the tensioning screw. A first inner ring groove is arranged on the inner side of the upper part of the first pressure-resistant cylinder corresponding to the mounting hole position. An expansion ring is arranged in the first inner ring groove. A steel ball with an inner end located in the upper joint is arranged in the mounting hole. An extrusion ring platform is arranged on the outer side of the lower end of the tensioning screw corresponding to the position below the mounting hole. The tensioning screw is provided with an upper The cam is provided with a second inner ring groove on the inner side of the lower end of the tensioning screw, a tensioning bolt with an upper end located in the installation cavity is provided in the second inner ring groove, a first outer ring platform is provided on the outer side of the lower end of the tensioning bolt, a limiting disc spring is provided on the outer side of the tensioning bolt corresponding to the position between the upper end of the first outer ring platform and the upper end of the first inner ring groove, a third inner ring groove is provided on the outer side of the upper part of the first outer ring platform, a retaining ring is provided in the third inner ring groove, a tensioning pressure plate fixedly installed with the lower end of the extrusion ring platform is provided on the outer side of the tensioning bolt corresponding to the position below the third inner ring groove, and a retaining ring is provided under the tensioning pressure plate The tensioning nut is fixedly installed on the outer side of the lower end of the tensioning bolt in the square position; the first connection assembly includes a first skeleton connector, a first rubber shock-absorbing joint, a first connector gland and a first Lemo connector seat, the inner side of the lower end of the second pressure-resistant cylinder is provided with a first skeleton connector installed together with the second circuit board skeleton, the lower end of the first skeleton connector is plugged into the first rubber shock-absorbing joint by interference fit, the outer side of the lower end of the first rubber shock-absorbing joint is fixedly installed with a first connection gland, and the inner side of the lower end of the first connection gland is limitedly installed with the first Lemo connector seat with the upper end located therein; the second connection assembly includes a second skeleton connector, a second rubber shock-absorbing joint, a second connector gland and a second Lemo connector seat, the inner side of the lower end of the third pressure-resistant cylinder is provided with a second skeleton connector installed together with the third circuit board skeleton, the lower end of the second skeleton connector is plugged into the second rubber shock-absorbing joint by interference fit, the outer side of the lower end of the second rubber shock-absorbing joint is fixedly installed with a second connection gland, and the inner side of the lower end of the second connection gland is limitedly installed with the second Lemo connector seat with the upper end located therein. ; 2. The anti-collision instrument for detecting while drilling based on the principle of static magnetometry according to claim 1 is characterized in that The magnetic field acquisition control module includes a magnetic field acquisition circuit, a digital signal processing unit and a fluxgate drive circuit. The magnetic field acquisition circuit includes three acquisition subcircuits and a field programmable logic array. Each acquisition subcircuit includes a fluxgate sensor, a bandpass filter, a gain circuit and a digital-to-analog converter connected in sequence. The fluxgate sensor is excited by the fluxgate drive circuit. Each acquisition subcircuit is used to respectively acquire and process the magnetic flux of the X, Y and Z axes. The field programmable logic array is used to store the signals obtained after the three acquisition subcircuits process as sampling waveform data. The digital signal processing unit is used to perform digital bandpass filtering on the sampled waveform data, perform digital phase-sensitive detection on the filtered signal obtained by the digital bandpass filtering, perform digital integration on the waveform data after the digital phase-sensitive detection, and perform digital low-pass filtering and amplitude extraction on the waveform data obtained by the digital integration to obtain the magnetic field strength.

3. The anti-collision instrument for detecting while drilling based on the static magnetometry principle according to claim 1 or 2, characterized in that The first rectifying and voltage stabilizing module and the second rectifying and voltage stabilizing module both include a decoding chip, a diode, a field effect tube driving circuit, a comparison circuit, a phase-locked loop demodulator, a voltage protection circuit and a capacitive coupling transformer which are connected in sequence.

4. The anti-collision instrument for detecting while drilling based on the static magnetometry principle according to claim 1 or 2, characterized in that It also includes a shock-absorbing assembly, which includes an aluminum card gasket, an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket. An aluminum card gasket is provided at the upper end of the upper joint, and an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket are fixedly installed on the upper side of the aluminum card gasket from top to bottom.

5. The anti-collision instrument for detecting while drilling based on the principle of static magnetometry according to claim 3 is characterized in that It also includes a shock-absorbing assembly, which includes an aluminum card gasket, an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket. An aluminum card gasket is provided at the upper end of the upper joint, and an upper shock-absorbing gasket, a metal gasket and a lower shock-absorbing gasket are fixedly installed on the upper side of the aluminum card gasket from top to bottom.

6. The anti-collision instrument for detecting while drilling based on the static magnetometry principle according to claim 1, 2 or 5, characterized in that It also includes a centralizer rib plate, and the centralizer rib plate is fixedly installed on the outer side of the middle part of the centralizing joint.

7. The anti-collision instrument for detecting while drilling based on the static magnetometry principle according to claim 3 is characterized in that It also includes a centralizer rib plate, and the centralizer rib plate is fixedly installed on the outer side of the middle part of the centralizing joint.

8. The anti-collision instrument for detecting while drilling based on the principle of static magnetometry according to claim 4 is characterized in that It also includes a centralizer rib plate, and the centralizer rib plate is fixedly installed on the outer side of the middle part of the centralizing joint.

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