Measurement-while-drilling sub

Abstract

The present application relates to the technical field of oil drilling tools, and discloses a drilling measurement sub, which comprises an upper cover, a lower cover, a core pipe, an outer cylinder, a drilling pressure and torque and bending moment composite sensor, an inner temperature and pressure sensor, an outer temperature and pressure sensor, a power generation unit, a processing unit and a storage unit, the lower side of the upper cover is fixedly provided with the core pipe, the lower end of the core pipe is fixedly provided with the lower cover, and the outer side of the core pipe is provided with the outer cylinder. The drilling measurement sub has a reasonable and compact structure, is installed near a drill bit during use, and collects temperature and annular space pressure information through the inner temperature and pressure sensor and the outer temperature and pressure sensor during drilling. Drilling pressure and drill pipe deformation are transmitted to the drilling measurement sub, drilling pressure, bending moment and torque information can be measured through the deformation of the core pipe, and then transmitted to the processing unit through a wire. The power generation unit enables the drilling measurement sub to have an autonomous cruising function, so that the transmission power of the processing unit can be appropriately increased, and the clarity and accuracy of information can be ensured.

Description

Technical Field

[0001] This invention relates to the field of oil drilling tool technology, specifically a measurement-while-drilling sub. Background Technology

[0002] With the continuous deepening of oil exploration and development, there are more and more special and complex wells such as deep wells, ultra-deep wells, and horizontal wells with large displacement. The occurrence rate of abnormal and complex situations during drilling is getting higher and higher, which poses unprecedented challenges to drilling process control. During the drilling process, parameters such as temperature and pressure in the entire wellbore are always the parameters that drilling engineers are concerned about. How to quickly and accurately detect parameters such as temperature and pressure in the annulus is of great significance for safe and efficient drilling.

[0003] Chinese patent document CN119102592A discloses a multi-location drilling parameter monitoring device and method. The multi-location drilling parameter monitoring device includes a drill collar body, a frame, and a sleeve. The frame is located inside the sleeve and connected to the drill collar body. The drill collar body has several sets of first cylindrical grooves and a set of second cylindrical grooves along the axial direction. In each set, there are several first cylindrical grooves and several second cylindrical grooves, which are distributed circumferentially along the outer side wall of the drill collar body. In the same transverse section, a transverse energized channel for communication is formed between the bottoms of adjacent first cylindrical grooves. In the same longitudinal section, the bottom side walls of the second cylindrical grooves and all first cylindrical grooves have the same longitudinal energized channel. A bending moment detection module is installed in the second cylindrical groove, which is used to detect the bending moment of the drill collar body. A speed sensor, an impact vibration sensor, and a temperature sensor are installed on the frame.

[0004] Chinese patent document CN116104485A discloses a measurement-while-drilling device, which includes a drill collar body, a launch sub, a battery sub, an internal pressure sensor, an external pressure sensor, a power port plug, a communication plug cover, a communication plug, a long cover, an inner ring hollow cover, an outer ring hollow cover, and a communication port cover. The drill collar body has at least two mounting slots spaced circumferentially on its outer side, with at least one launch sub and at least one battery sub in each slot. A long cover is fixedly mounted on the outer side of the drill collar body corresponding to each mounting slot. The upper outer side of the drill collar body has a first groove, a second groove, and a third groove spaced circumferentially. The drill collar has an internal pressure transmission hole that communicates with the first groove. An internal pressure sensor is installed in the first groove, and an inner ring cover plate is fixedly installed in the first groove. An external pressure sensor is installed in the second groove, and an outer ring cover plate is fixedly installed on the outside of the drill collar body corresponding to the position of the second groove. The outer ring cover plate has an external pressure transmission hole that runs through the inside and outside. The third groove has a power port plug, a communication plug cover plate, and a communication plug arranged sequentially from the inside to the outside. A communication port cover plate is fixedly installed on the outside of the drill collar body corresponding to the position of the third groove. Each mounting slot is connected to the adjacent mounting slot through a first radial channel. The first, second, and third grooves are connected to the corresponding mounting slots through axial channels.

[0005] Existing measurement-while-drilling (MWD) subs have problems such as short service time, high cost, low efficiency, and inaccurate information acquisition when used in oil drilling. There is an urgent need for a new MWD sub to solve these problems. Summary of the Invention

[0006] This invention provides a measurement-while-drilling (MWD) sub that overcomes the shortcomings of the prior art and effectively solves the problems of short service time, high cost, and low efficiency of existing MWD subs used in oil drilling.

[0007] The technical solution of this invention is achieved through the following measures: a measurement-while-drilling (MWD) sub includes an upper cover, a lower cover, a core tube, an outer cylinder, a drill pressure torque-bending moment composite sensor, an internal temperature and pressure sensor, an external temperature and pressure sensor, a power generation unit, a processing unit, and a storage unit. The core tube is fixedly installed at the center of the lower side of the upper cover, and the lower cover is fixedly installed at the lower end of the core tube. An outer cylinder is provided outside the core tube; the upper end of the outer cylinder is sealed to the upper cover, and the lower end of the outer cylinder is sealed to the lower cover. An annular mounting cavity is formed between the inner side of the outer cylinder and the outer side of the core tube. A plurality of drill pressure torque-bending moment composite sensors are evenly distributed circumferentially along the lower outer side of the core tube. The inner side of the upper part of the core tube has several first acquisition holes that are evenly distributed around the circumference and are connected to the inside. Each first acquisition hole is equipped with an internal temperature and pressure sensor for collecting the temperature and pressure of the fluid inside the core tube. The outer side of the outer cylinder has several second acquisition holes that are evenly distributed around the circumference and are connected to the inside. Each second acquisition hole is equipped with an external temperature and pressure sensor for collecting the temperature and pressure of the fluid outside the outer cylinder. The mounting cavity is equipped with a power generation unit, a processing unit, and a storage unit. The drilling pressure torque and bending moment composite sensor, the internal temperature and pressure sensor, and the external temperature and pressure sensor are all connected to the processing unit. The processing unit is connected to the power generation unit and the storage unit, respectively.

[0008] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0009] The mounting cavity below the aforementioned internal temperature and pressure sensor can be fitted with a sleeve that fits over the outer side of the core tube. The outer side of the sleeve corresponding to the drilling pressure, torque, and bending moment composite sensor position has a through hole that connects the inside and outside and is strip-shaped. An inner cylinder is fitted over the outer side of the sleeve. An end cap is fixedly installed between the inner side of the lower end of the inner cylinder and the outer side of the sleeve. An upper partition and a lower partition are installed vertically between the inner side of the inner cylinder and the outer side of the sleeve, corresponding to the position above the end cap. A first electronic compartment frame is located between the upper side of the upper partition and the upper inner side of the inner cylinder. A battery box is fixedly installed between the lower side of the upper partition and the upper side of the lower partition. The lower side of the lower partition and the end... A second electronic chamber frame is fixedly installed between the upper and lower sides of the cover. A support frame is provided between the second electronic chamber frame and the casing. The support frame is fixedly installed together with the end of each drilling pressure torque bending moment composite sensor. The processing unit includes a temperature and pressure processor fixedly installed on the outside of the first electronic chamber frame and a drilling pressure bending moment processor fixedly installed on the outside of the second electronic chamber frame. The inner temperature and pressure sensor and the outer temperature and pressure sensor are both connected to the temperature and pressure processor. The drilling pressure torque bending moment composite sensor is connected to the drilling pressure bending moment processor. The temperature and pressure processor and the drilling pressure bending moment processor are both connected to the power generation unit and the storage unit.

[0010] A first mounting ring platform can be fixedly installed on the upper inner side of the aforementioned inner cylinder. The lower end of the first mounting ring platform has a first mounting ring groove with an opening facing downwards. A second mounting ring platform is fixedly installed on the upper side of the upper partition plate. The upper end of the second mounting ring platform has a second mounting ring groove with an opening facing upwards. The upper outer side of the first electronic compartment frame is fitted into the first mounting ring groove. The upper end of the first electronic compartment frame has a first elastic reset member fitted into the first mounting ring groove. The lower outer side of the first electronic compartment frame is fitted into the second mounting ring groove. The lower end of the first electronic compartment frame has a second elastic reset member fitted into the second mounting ring groove. A third mounting ring platform is fixedly installed on the lower side of the lower partition plate. The lower end of the third mounting ring platform has a third mounting ring groove with an opening facing downwards. A fourth mounting ring platform is fixedly installed on the upper side of the end cap. The upper end of the fourth mounting ring platform has a fourth mounting ring groove with an opening facing upwards. The upper outer side of the second electronic compartment frame is fitted into the third mounting ring groove. The upper end of the second electronic compartment frame has a third elastic reset member fitted into the third mounting ring groove. The lower outer side of the second electronic compartment frame is fitted into the fourth mounting ring groove. The lower end of the second electronic compartment frame has a fourth elastic reset member fitted into the fourth mounting ring groove.

[0011] The inner side of the aforementioned core tube has two to four interconnected first acquisition holes evenly distributed along the circumference. A second acquisition hole is provided on the outer side of the outer cylinder corresponding to each first acquisition hole. At least two battery boxes are distributed circumferentially between the upper and lower partitions. The power generation unit includes a charging / discharging module, a power management module, a first power generation module, and a second power generation module. One battery box contains the power management module, and at least one battery box contains the charging / discharging module. At least one first power generation module is distributed circumferentially on the lower side of the upper cover corresponding to the position above the inner cylinder. At least one second power generation module with the same structure as the first power generation module is provided on the upper side of the lower cover. Both the first and second power generation modules are connected to the power management module, which is connected to the charging / discharging module. The charging / discharging module is connected to the temperature and pressure processor and the drilling and bending moment processor, respectively. Several vertically penetrating first wiring holes are distributed circumferentially at the lower end of the upper partition. A first limiting sleeve is fixedly installed on the lower side of the upper partition corresponding to each first wiring hole. Each first limiting sleeve... The lower outer side is fitted with a second limiting sleeve, each second limiting sleeve is fixedly installed to the upper side of the corresponding battery box. The lower end of each first limiting sleeve and the upper side of the corresponding battery box are provided with a fifth elastic reset component. The upper side of each battery box is provided with a second wiring hole that corresponds one-to-one with the first wiring hole and is internally and externally connected. The lower end of the lower partition has several vertically penetrating third wiring holes distributed at intervals along the circumference. A third limiting sleeve is fixedly installed on the upper side of the lower partition corresponding to each third wiring hole. The upper outer side is fitted with a fourth limiting sleeve, and each fourth limiting sleeve is fixedly installed with the lower side of the corresponding battery box. The upper end of each third limiting sleeve and the lower side of the corresponding battery box are provided with a sixth elastic reset component. The lower side of each battery box is provided with a fourth wire hole that corresponds one-to-one with the third wire hole and is connected inside and outside. Several upper buffer components are evenly distributed along the circumference between the upper end of the inner cylinder and the lower side of the upper cover. The lower side of the end cover and the upper side of the lower cover are provided with lower buffer components that have the same structure as the upper buffer components and are symmetrically distributed.

[0012] The aforementioned first power generation module may include a shielding shell, a magnetic box, a shielding pad, a rubber pad, a magnet, a power generation plate, and an insulating sleeve. Several shielding shells are distributed circumferentially at intervals on the lower side of the upper cover. A magnetic box is fixedly installed inside the shielding shell. A shielding pad and a rubber pad are arranged sequentially from top to bottom on the inner side of the upper part of the magnetic box. Two magnets are arranged at intervals from the inside to the outside on the inner side of the magnetic box corresponding to the position below the rubber pad. A power generation plate is arranged between the two magnets. There are gaps between the inner and outer sides of the power generation plate and the two magnets. When the power generation plate moves up and down relative to the magnets, it can output current to the power management module. An insulating sleeve is fitted on the outer side of the end of the power generation plate.

[0013] The aforementioned battery box may be equipped with a counterweight.

[0014] The aforementioned upper buffer assembly may include a limiting post, a venting post, and a seventh elastic reset component. The upper end of the inner cylinder has several vertically penetrating venting holes distributed at intervals along the circumference. A hollow limiting post is fixedly installed at the upper end of the inner cylinder corresponding to each venting hole position. A tubular venting post is fitted on the outer side of the upper part of each limiting post. Several venting holes that connect the inside and outside are evenly distributed at intervals along the circumference on the outer side of the venting post. A seventh elastic reset component is provided between the limiting post and the lower end of the upper cover.

[0015] A sealing tube may be provided between the inner side of the outer cylinder and the outer side of the inner cylinder. The lower side of the upper cover is provided with a first sealing ring groove and a second sealing ring groove with downward opening from the inside to the outside. The upper side of the lower cover is provided with a third sealing ring groove and a fourth sealing ring groove with upward opening from the inside to the outside. The upper outer side of the sealing tube is fitted into the first sealing ring groove, and the lower outer side of the sealing tube is fitted into the third sealing ring groove. The upper end of the outer cylinder is fixed with a first sealing ring platform fitted into the second sealing ring groove, and the lower end of the outer cylinder is fixed with a second sealing ring platform fitted into the fourth sealing ring groove. The upper outer side and the lower outer side of the outer cylinder are each provided with several external mounting holes with ends extending to the inner side of the sealing tube distributed circumferentially. Each external mounting hole is sealed and fixedly installed with a Pel patch, which is connected to the charge and discharge module.

[0016] The inner side of the middle part of the outer cylinder may be provided with an inner annular groove, and an annular heat insulation cavity is formed between the inner annular groove and the sealing pipe, and a heat insulation layer is provided inside the heat insulation cavity.

[0017] This invention features a reasonable and compact structure. During use, the measurement-while-drilling (MWD) sub is installed near the drill bit. During drilling, the MWD sub analyzes, processes, and stores the real-time collected information. The upper cover, outer cylinder, and lower cover are fixed together by bolts and sealing rings, preventing loosening due to vibrations during drilling. Two sealing rings are provided at the connections of the upper cover, outer cylinder, and lower cover for sealing. To ensure accurate measurements of drill pressure, bending moment, and torque, the lower end of the core tube is tightly fixed to the upper end of the lower cover to prevent measurement distortion caused by gaps at the connection. A sealing ring is also fitted at the connection for sealing purposes.

[0018] During drilling, internal and external temperature and pressure sensors collect temperature and annular pressure information, which is then transmitted to the processing unit via wires. The measurement-while-drilling (MWD) sub of this application has a built-in power generation unit, enabling autonomous power generation. The processing unit can increase its processing power, process the temperature and annular pressure information, and store it in the storage unit. Alternatively, it can utilize existing known technologies to process the temperature and annular pressure information and send it to the non-magnetic drill pipe in the drill string. The non-magnetic drill pipe will then transmit the information to the surface, thereby achieving real-time transmission of underground information. The power generation unit enables the MWD sub to have autonomous power supply, which allows for an appropriate increase in the transmission power of the processing unit, ensuring the clarity and accuracy of the information.

[0019] During drilling, a composite sensor for drilling pressure, bending moment, and torque is installed at the bottom of the core tube to monitor drilling pressure, bending moment, and torque information in real time. This composite sensor also adopts a sputtered thin-film design and is integrated into one unit. When drilling, drilling pressure and drill pipe deformation are transmitted to the measurement-while-drilling (MWD) sub. By measuring the deformation of the core tube, drilling pressure, bending moment, and torque information can be measured. The MWD sub is connected to the processing unit via wires for real-time transmission of the collected information. The processing unit processes and stores the drilling pressure, bending moment, and torque information. Alternatively, using existing known technology, the processed drilling pressure, bending moment, and torque information can be sent to the non-magnetic drill pipe in the drill string. The non-magnetic drill pipe will then transmit the information to the surface, thus achieving real-time transmission of underground information. The power generation unit enables the MWD sub to have autonomous power supply, which allows for an appropriate increase in the transmission power of the processing unit, ensuring the clarity and accuracy of the information. Attached Figure Description

[0020] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of the present invention, numbers one to nine.

[0021] Appendix Figure 2 This is a three-dimensional structural diagram of the present invention after removing the outer cylinder and sealing tube (Figures 1 to 9).

[0022] Appendix Figure 3 This is a three-dimensional cross-sectional view of the inner cylinder in embodiments one through nine of the present invention.

[0023] Appendix Figure 4 This is a schematic diagram of the main sectional view of the outer cylinder in embodiments one through nine of the present invention.

[0024] Appendix Figure 5 This is a schematic diagram of the main sectional view of the upper cover and the core tube in embodiments one through nine of the present invention.

[0025] Appendix Figure 6 This is a three-dimensional structural diagram of the upper cover and core tube in embodiments one through nine of the present invention.

[0026] Appendix Figure 7 This is a three-dimensional structural schematic diagram of the composite sensor for drilling pressure, torque, and bending moment in embodiments one through nine of the present invention.

[0027] Appendix Figure 8 This is a three-dimensional structural diagram of the support frame in the first to ninth embodiments of the present invention.

[0028] Appendix Figure 9 This is a three-dimensional structural diagram of the shielding shell in embodiments five to nine of the present invention.

[0029] Appendix Figure 10 This is a three-dimensional structural diagram of the power generation element in embodiments five to nine of the present invention.

[0030] Appendix Figure 11This is a three-dimensional structural diagram of the heat insulation layer of the present invention.

[0031] The codes in the attached diagram are as follows: 1 for upper cover, 2 for lower cover, 3 for core tube, 4 for outer cylinder, 5 for drilling pressure torque and bending moment composite sensor, 6 for internal temperature and pressure sensor, 7 for external temperature and pressure sensor, 8 for mounting cavity, 9 for storage unit, 10 for sleeve, 11 for through hole, 12 for inner cylinder, 13 for end cap, 14 for upper partition, 15 for lower partition, 16 for first electronic compartment frame, 17 for battery box, 18 for second electronic compartment frame, 19 for support frame, 20 for temperature and pressure processor, 21 for drilling pressure and bending moment processor, 22 for first mounting ring platform, 23 for second mounting ring platform, 24 for first elastic reset component, 25 for second elastic reset component, 26 for third mounting ring platform, 27 for fourth mounting ring platform, and 28 for third elastic reset component. 29 is the fourth elastic reset component, 30 is the charging / discharging module, 31 is the power management module, 32 is the first limiting sleeve, 33 is the second limiting sleeve, 34 is the fifth elastic reset component, 35 is the third limiting sleeve, 36 is the fourth limiting sleeve, 37 is the sixth elastic reset component, 38 is the second power generation module, 39 is the shielding shell, 40 is the magnetic box, 41 is the shielding pad, 42 is the rubber pad, 43 is the magnet, 44 is the power generation plate, 45 is the insulating sleeve, 46 is the counterweight, 47 is the lower buffer assembly, 48 is the limiting post, 49 is the vent post, 50 is the seventh elastic reset component, 51 is the vent hole, 52 is the sealing tube, 53 is the first sealing ring platform, 54 is the second sealing ring platform, 55 is the Peltier patch, and 56 is the heat insulation layer. Detailed Implementation

[0032] The present invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of the present invention.

[0033] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0034] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0035] Example 1: As shown in the attached document Figures 1 to 7As shown, the measurement-while-drilling (MWD) sub includes an upper cover 1, a lower cover 2, a core tube 3, an outer cylinder 4, a drill pressure, torque, and bending moment composite sensor 5, an internal temperature and pressure sensor 6, an external temperature and pressure sensor 7, a power generation unit, a processing unit, and a storage unit 9. The core tube 3 is fixedly installed at the center of the lower side of the upper cover 1, and the lower cover 2 is fixedly installed at the lower end of the core tube 3. An outer cylinder 4 is provided on the outside of the core tube 3. The upper end of the outer cylinder 4 is sealed to the upper cover 1, and the lower end of the outer cylinder 4 is sealed to the lower cover 2. An annular mounting cavity 8 is formed between the inner side of the outer cylinder 4 and the outer side of the core tube 3. Several drill pressure, torque, and bending moment composite sensors 5 are evenly distributed along the circumference of the lower outer side of the core tube 3. The upper inner side has several first collection holes that are evenly distributed around the circumference and are connected to the inside. Each first collection hole is equipped with an inner temperature and pressure sensor 6 for collecting the temperature and pressure of the fluid inside the core tube 3. The outer side of the outer cylinder 4 has several second collection holes that are evenly distributed around the circumference and are connected to the inside. Each second collection hole is equipped with an outer temperature and pressure sensor 7 for collecting the temperature and pressure of the fluid outside the outer cylinder 4. The mounting cavity 8 is equipped with a power generation unit, a processing unit, and a storage unit 9. The drilling pressure torque and bending moment composite sensor 5, the inner temperature and pressure sensor 6, and the outer temperature and pressure sensor 7 are all connected to the processing unit. The processing unit is connected to the power generation unit and the storage unit 9, respectively.

[0036] According to requirements, both the upper cover 1 and the lower cover 2 have through-holes at their upper center to facilitate fluid flow. The upper cover 1 and the core tube 3 are integrally formed. The lower outer side of the core tube 3 is sealed and fixed to the upper inner side of the upper cover 1. Three drilling pressure torque and bending moment composite sensors 5 are evenly distributed around the circumference of the lower outer side of the core tube 3. Three first acquisition holes with internal and external connections are evenly distributed around the circumference of the upper inner side of the core tube 3. The inner temperature and pressure sensor 6 is fitted with an inner sealing rubber ring and then press-fitted with the first acquisition hole. Three second acquisition holes with internal and external connections are evenly distributed around the circumference of the outer cylinder 4. The second acquisition holes correspond one-to-one with the first acquisition holes. The outer temperature and pressure sensor... The outer sealing rubber ring 7 is inserted into the second acquisition hole with an interference fit to ensure sealing performance. Both the first and second acquisition holes are circular. The outer cylinder 4 can be made of a known high-strength alloy to enhance wear resistance and corrosion resistance. The inner temperature and pressure sensor 6 and the outer temperature and pressure sensor 7 are designed with sputtered thin film to integrate the acquisition temperature and annular pressure. Since the inner temperature and pressure sensor 6 and the outer temperature and pressure sensor 7 are in direct contact with the mud, they are designed to resist erosion. The inner temperature and pressure sensor 6 and the outer temperature and pressure sensor 7 can also be based on known technologies, such as the temperature and pressure sensor disclosed in Chinese patent document CN214066516U.

[0037] When in use, the measurement-while-drilling sub is installed near the drill bit. During drilling, the measurement-while-drilling sub can analyze, process, and store the real-time information collected. The upper cover 1, outer cylinder 4, and lower cover 2 are fixed together by bolts and sealing rings to prevent loosening due to vibrations during drilling. Two sealing rings are provided at the connection points of the upper cover 1, outer cylinder 4, and lower cover 2 to provide a sealing effect. To ensure the accuracy of the measurement of drilling pressure, bending moment, and torque, the lower end of the core tube 3 is tightly fixed to the upper end of the lower cover 2 to prevent measurement distortion caused by gaps at the connection points of the lower end of the core tube 3 and the upper end of the lower cover 2. Sealing rings are also fitted at the connection points to provide a sealing effect.

[0038] During drilling, the internal temperature and pressure sensor 6 and the external temperature and pressure sensor 7 collect temperature and annular pressure information, which is then transmitted to the processing unit via wires. The measurement-while-drilling sub of this application has a built-in power generation unit, which enables autonomous power generation. The processing unit can increase its processing power and process the temperature and annular pressure information and store it in the storage unit 9. Alternatively, it can use existing known technology to process the temperature and annular pressure information and send it to the non-magnetic drill pipe (not shown) in the drill pipe. The non-magnetic drill pipe will then transmit the information to the surface, thereby realizing the real-time transmission of underground information. The power generation unit enables the measurement-while-drilling sub to have autonomous endurance, which can appropriately increase the transmission power of the processing unit and ensure the clarity and accuracy of the information.

[0039] During the drilling process, in order to monitor the drilling pressure, bending moment and torque information in real time, a composite sensor 5 for drilling pressure, torque and bending moment is installed at the bottom of the core tube 3. The composite sensor 5 for drilling pressure, torque and bending moment also adopts a sputtered thin film design and is integrated into one unit. The composite sensor 5 for drilling pressure, torque and bending moment can also be a known technology, such as a drilling pressure and torque patch or a BSP00YC torque and pressure sensor. During drilling, drill pressure and drill pipe deformation are transmitted to the measurement-while-drilling (MWD) sub. By measuring the deformation of the core tube 3, drill pressure, bending moment, and torque information can be obtained. The MWD sub is connected to the processing unit via wires for real-time transmission of the collected information. The processing unit processes and stores the drill pressure, bending moment, and torque information in the storage unit 9. Alternatively, using existing known technologies, the drill pressure, bending moment, and torque information can be processed and sent to the non-magnetic drill pipe (not shown) in the drill pipe. The non-magnetic drill pipe will then transmit the information to the surface, thus realizing the real-time transmission of underground information. The power generation unit enables the MWD sub to have autonomous power supply, which can appropriately increase the transmission power of the processing unit and ensure the clarity and accuracy of the information.

[0040] The above-mentioned measurement-while-drilling sub can be further optimized and / or improved according to actual needs:

[0041] Example 2: As an optimization of the above examples, as shown in the appendix. Figures 1 to 8As shown, a sleeve 10 is provided inside the mounting cavity 8 below the internal temperature and pressure sensor 6, which is fitted onto the outside of the core tube 3. A through hole 11, which is connected internally and externally and is strip-shaped, is provided on the outside of the sleeve 10 at the position corresponding to the drilling pressure torque and bending moment composite sensor 5. An inner cylinder 12 is fitted onto the outside of the sleeve 10. An end cap 13 is fixedly installed between the inner side of the lower end of the inner cylinder 12 and the outer side of the sleeve 10. An upper partition 14 and a lower partition 15 are installed vertically and vertically between the inner side of the inner cylinder 12 and the outer side of the sleeve 10, corresponding to the position above the end cap 13. A first electronic compartment frame 16 is provided between the upper side of the upper partition 14 and the upper inner side of the inner cylinder 12. A battery box 17 is fixedly installed between the lower side of the upper partition 14 and the upper side of the lower partition 15. A second electronic chamber frame 18 is fixedly installed between the lower side of the 5 and the upper side of the end cap 13. A support frame 19 is provided between the second electronic chamber frame 18 and the casing 10. The support frame 19 is fixedly installed together with the end of each drilling pressure torque bending moment composite sensor 5. The processing unit includes a temperature and pressure processor 20 fixedly installed on the outside of the first electronic chamber frame 16 and a drilling pressure bending moment processor 21 fixedly installed on the outside of the second electronic chamber frame 18. The inner temperature and pressure sensor 6 and the outer temperature and pressure sensor 7 are both connected to the temperature and pressure processor 20. The drilling pressure torque bending moment composite sensor 5 is connected to the drilling pressure bending moment processor 21. The temperature and pressure processor 20 and the drilling pressure bending moment processor 21 are both connected to the power generation unit and the storage unit 9.

[0042] Depending on the requirements, the storage unit 9 can be installed on the outside of the first electronic compartment frame 16 or the outside of the second electronic compartment frame 18. Three grooves are evenly distributed around the circumference on the upper outer side of the core tube 3. One end of the drilling pressure, torque, and bending moment composite sensor 5 is installed in the groove, and the other end of the drilling pressure, torque, and bending moment composite sensor 5 is fixed to the support frame 19 with screws. In this way, the support frame 19 connects the three drilling pressure, torque, and bending moment composite sensors 5 in pairs. The deformation of the core tube 3 will be collected by the drilling pressure, torque, and bending moment composite sensor 5. Thus, the drilling pressure, bending moment, and torque information can be measured by measuring the deformation of the core tube 3. The temperature and pressure processor 20 and the drilling pressure and bending moment processor 21 transmit information separately without affecting each other. Even if one of them has a problem, the other can continue to work, ensuring the compatibility and fault tolerance of the measurement while drilling sub.

[0043] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown in Figure 3, a first mounting ring platform 22 is fixedly installed on the upper inner side of the inner cylinder 12. The lower end of the first mounting ring platform 22 is provided with a first mounting ring groove with an opening facing downwards. A second mounting ring platform 23 is fixedly installed on the upper side of the upper partition plate 14. The upper end of the second mounting ring platform 23 is provided with a second mounting ring groove with an opening facing upwards. The upper outer side of the first electronic compartment frame 16 is fitted into the first mounting ring groove. The upper end of the first electronic compartment frame 16 is provided with a first elastic reset member 24 fitted into the first mounting ring groove. The lower outer side of the first electronic compartment frame 16 is fitted into the second mounting ring groove. The lower end of the first electronic compartment frame 16 is provided with a second elastic reset member 24 fitted into the second mounting ring groove. Component 25, a third mounting ring platform 26 is fixedly installed on the lower side of the lower partition 15, the lower end of the third mounting ring platform 26 is provided with a third mounting ring groove with an opening facing downwards, a fourth mounting ring platform 27 is fixedly installed on the upper side of the end cover 13, the upper end of the fourth mounting ring platform 27 is provided with a fourth mounting ring groove with an opening facing upwards, the upper outer side of the second electronic compartment frame 18 is fitted into the third mounting ring groove, the upper end of the second electronic compartment frame 18 is provided with a third elastic reset member 28 fitted into the third mounting ring groove, the lower outer side of the second electronic compartment frame 18 is fitted into the fourth mounting ring groove, and the lower end of the second electronic compartment frame 18 is provided with a fourth elastic reset member 29 fitted into the fourth mounting ring groove.

[0044] As required, the first elastic reset element 24, the second elastic reset element 25, the third elastic reset element 28, and the fourth elastic reset element 29 are all existing and known cylindrical compression springs. During drilling, this arrangement helps to dampen vibrations, preventing damage to the unit, module, and sensor, and ensuring the service life of the components.

[0045] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown in Figure 3, two to four first collection holes with internal and external communication are evenly distributed along the circumference of the inner side of the core tube 3. A second collection hole is provided on the outer side of the outer cylinder 4 corresponding to each first collection hole position. At least two battery boxes 17 are distributed along the circumference between the upper partition 14 and the lower partition 15. The power generation unit includes a charging and discharging module 30, a power management module 31, a first power generation module, and a second power generation module 38. The power management module 31 is provided in one of the battery boxes 17, and the charging and discharging module 30 is provided in at least one of the battery boxes 17. The lower side of the upper cover 1, corresponding to the position above the inner cylinder 12, is circumferentially spaced... At least one first power generation module is distributed at intervals. At least one second power generation module 38 with the same structure as the first power generation module is provided on the upper side of the lower cover 2. Both the first and second power generation modules 38 are connected to the power management module 31, which is connected to the charging / discharging module 30. The charging / discharging module 30 is connected to the temperature and pressure processor 20 and the drilling and bending moment processor 21, respectively. Several vertically penetrating first wiring holes are distributed at intervals along the circumference of the lower end of the upper partition 14. A first limiting sleeve 32 is fixedly installed on the lower side of the upper partition 14 corresponding to each first wiring hole. Each first limiting sleeve... Each of the lower outer sides of the first limiting sleeve 32 is fitted with a second limiting sleeve 33. Each second limiting sleeve 33 is fixedly installed on the upper side of the corresponding battery box 17. The lower end of each first limiting sleeve 32 and the upper side of the corresponding battery box 17 are provided with a fifth elastic reset member 34. The upper side of each battery box 17 is provided with a second wire hole that corresponds one-to-one with the first wire hole and is connected inside and out. The lower end of the lower partition 15 has a number of vertically penetrating third wire holes distributed at intervals along the circumference. A third limiting sleeve 35 is fixedly installed on the upper side of the lower partition 15 corresponding to each third wire hole. The upper outer side of each of the three third limiting sleeves 35 is fitted with a fourth limiting sleeve 36. Each fourth limiting sleeve 36 is fixedly installed with the lower side of the corresponding battery box 17. The upper end of each third limiting sleeve 35 and the lower side of the corresponding battery box 17 are provided with a sixth elastic reset member 37. The lower side of each battery box 17 is provided with a fourth wire hole that corresponds one-to-one with the third wire hole and is connected inside and outside. Several upper buffer components are evenly distributed along the circumference between the upper end of the inner cylinder 12 and the lower side of the upper cover 1. The lower side of the end cover 13 and the upper side of the lower cover 2 are provided with a lower buffer component 47 that has the same structure as the upper buffer component and is symmetrically distributed.

[0046] According to the requirements, three battery boxes 17 are distributed circumferentially between the upper partition 14 and the lower partition 15. The battery boxes 17 are staggered with the first acquisition hole. Three through holes are evenly distributed on the upper side of the upper partition 14 and the lower partition 15. Three first wire holes are evenly distributed on the upper side of the upper partition 14 corresponding to the position between each pair of adjacent through holes. The second, third and fourth wire holes correspond one-to-one. Three temperature and pressure processors 20 are installed on the outside of the first electronic compartment frame 16. The three temperature and pressure processors 20 are connected to each other by wires. Three drilling and bending moment processors 21 are installed on the outside of the second electronic compartment frame 18. The drilling and bending moment processors 21 are connected to each other by wires.

[0047] The battery box 17 has a detachable and sealed cover on its outside. Two of the three battery boxes 17 are used to install the charging and discharging module 30. The other battery box 17 has a three-layer structure. The power management module 31 includes a filter and a rectifier installed in the top two layers from top to bottom. The bottom layer is used to install a counterweight. In order to dissipate heat from the battery box 17, the two battery boxes 17 used to install the charging and discharging module 30 have rows of heat dissipation holes evenly distributed on their outside.

[0048] The fifth elastic reset element 34 and the sixth elastic reset element 37 are both existing cylindrical compression springs. The fifth elastic reset element 34 and the sixth elastic reset element 37 can again play a vibration damping role, avoiding damage to the unit, module and sensor caused by vibration, and ensuring the service life of the parts.

[0049] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 5, 9, and 10, the first power generation module includes a shielding shell 39, a magnetic box 40, a shielding pad 41, a rubber pad 42, a magnet 43, a power generation piece 44, and an insulating sleeve 45. Several shielding shells 39 are distributed circumferentially on the lower side of the upper cover 1. A magnetic box 40 is fixedly installed inside the shielding shell 39. The shielding pad 41 and the rubber pad 42 are arranged sequentially from top to bottom on the inner side of the upper part of the magnetic box 40. Two magnets 43 are arranged from the inside to the outside on the inner side of the magnetic box 40 corresponding to the position below the rubber pad 42. A power generation piece 44 is arranged between the two magnets 43. There is a gap between the inner and outer sides of the power generation piece 44 and the two magnets 43. When the power generation piece 44 moves up and down relative to the magnets 43, it can output current to the power management module 31. An insulating sleeve 45 is fitted on the outer side of the end of the power generation piece 44.

[0050] According to the requirements, the generator sheet 44 is a known copper sheet. Three slots are evenly distributed around the circumference on the lower side of the upper cover 1. A rectangular ring groove is provided on the bottom wall of each slot. The upper end of the magnetic box 40 is inserted into the rectangular ring groove. Then, the shielding pad 41, the rubber pad 42 and the magnet 43 are placed in the magnetic box 40 in sequence. Then, the shielding shell 39 is put on the outside of the magnetic box 40. Finally, the shielding shell 39 is fixedly installed together with the upper cover 1 with self-locking screws.

[0051] The generator plate 44 of the first power generation module is connected to the power management module 31 (rectifier) ​​inside the battery box 17 via a wire passing through the shielding shell 39, the lower side of the inner cylinder 12, the upper partition 14, and the upper inner side of the battery box 17. The rectifier is connected to the filter via a wire, and the filter is connected to the charging and discharging module 30 inside one of the battery boxes 17 via a wire. The generator plate 44 of the second power generation module 38 is connected to the power management module 31 (rectifier) ​​inside the battery box 17 via a wire passing through the shielding shell 39, the upper side of the end cover 13, the lower partition 15, and the lower inner side of the battery box 17. The rectifier is connected to the filter via a wire, and the filter is connected to the charging and discharging module 30 inside the other battery box 17 via a wire.

[0052] During drilling, the drill bit will continuously vibrate. In order to effectively reduce vibration, the upper and lower buffer components 47 can form a first layer of vibration reduction, which greatly reduces the impact of vibration on the module inside the inner cylinder 12. At the same time, in order to effectively utilize the energy of vibration, the back-and-forth vibration of the sub will cause the inner cylinder 12 to move up and down. The generator plate 44, which is fixedly connected to the power management module 31 inside the inner cylinder 12, moves up and down relative to the magnets 43. In this way, the generator plate 44 cuts the magnetic field lines between the magnets 43, generating current. The current enters the power management module 31 through the wire. The rectifier of the power management module 31 first integrates the current into a regular current suitable for charging. At the same time, the rectifier of the power management module 31 guides the current to the filter of the power management module 31 through the wire for further processing. The current after passing through the filter of the power management module 31 then charges the charging and discharging modules 30 (batteries) on both sides through the wire. In this way, the energy of vibration can be fully utilized to greatly improve the working time of the measurement while drilling sub.

[0053] The rubber pad 42 can prevent the magnet 43 from being magnetized after contacting the top cover 1. The shielding pad 41 and the shielding shell 39 form a closed space, which can isolate the magnetic field and prevent the magnetic field of the magnet 43 from being affected by the downhole magnetic field. It can also prevent the magnetic field of the magnet 43 from affecting the acquisition and transmission of information in the downhole measurement and control sub.

[0054] Example 6: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 3, the battery box 17 is equipped with a counterweight 46.

[0055] During use, this setup ensures the balance of the measurement sub during drilling. The counterweight 46 is fixed to the battery box 17 below the filter by screws, which helps to balance the center of gravity.

[0056] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown in Figures 3 and 5, the upper buffer assembly includes a limiting post 48, a venting post 49, and a seventh elastic reset member 50. The upper end of the inner cylinder 12 has several vertically penetrating vent holes distributed at intervals along the circumference. A hollow limiting post 48 is fixedly installed at the upper end of the inner cylinder 12 corresponding to the position of each venting post 51. A tubular venting post 49 is fitted on the outer side of the upper part of each limiting post 48. Several venting holes 51 that connect the inside and outside are evenly distributed at intervals along the circumference on the outer side of the venting post 49. A seventh elastic reset member 50 is provided between the limiting post 48 and the lower end of the upper cover 1.

[0057] According to the requirements, the seventh elastic reset element 50 is a known cylindrical compression spring, and the upper end of the inner cylinder 12 has three vertically penetrating vent holes evenly distributed along the circumference.

[0058] During drilling, the drill bit will continuously vibrate. In order to effectively reduce vibration, the cooperation between the limiting column 48, the venting column 49 and the seventh elastic reset member 50 in the upper buffer assembly and the lower buffer assembly 47 can form the first vibration reduction, which greatly reduces the impact of vibration on the inner module of the inner cylinder 12.

[0059] During drilling, the seventh elastic reset component 50 plays a primary vibration reduction role, while the first elastic reset component 24, the second elastic reset component 25, the third elastic reset component 28, the fourth elastic reset component 29, the fifth elastic reset component 34, and the sixth elastic reset component 37 play a secondary vibration reduction role. These components respectively provide secondary vibration reduction for the temperature and pressure processor 20 on the first electronic compartment frame 16, the drilling pressure and bending moment processor 21 on the second electronic compartment frame 18, as well as the power generation unit and the storage unit 9, thereby reducing the damage of vibration to the parts and ensuring the service life of various parts.

[0060] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 , 2 As shown in Figure 4, a sealing tube 52 is provided between the inner side of the outer cylinder 4 and the outer side of the inner cylinder 12. The lower side of the upper cover 1 is provided with a first sealing ring groove and a second sealing ring groove with downward openings from the inside to the outside. The upper side of the lower cover 2 is provided with a third sealing ring groove and a fourth sealing ring groove with upward openings from the inside to the outside. The upper outer side of the sealing tube 52 is sealed and fitted in the first sealing ring groove, and the lower outer side of the sealing tube 52 is sealed and fitted in the third sealing ring groove. The upper end of the outer cylinder 4 is fixed with a first sealing ring platform 53 that is sealed and fitted in the second sealing ring groove, and the lower end of the outer cylinder 4 is fixed with a second sealing ring platform 54 that is sealed and fitted in the fourth sealing ring groove. The upper outer side and the lower outer side of the outer cylinder 4 are provided with several external mounting holes with ends extending to the inner side of the sealing tube 52 distributed circumferentially. Each external mounting hole is sealed and fixedly installed with a Pel patch 55, which is connected to the charge and discharge module 30.

[0061] According to the requirements, the outer cylinder 4 has three external mounting holes that extend to the inner side of the sealing tube 52 at intervals along the circumference on both the upper and lower outer sides. The Pel patch 55 is a known technology. The external mounting holes are rectangular. The outer side of the Pel patch 55 has three sealing ring grooves at intervals along the circumference from the inside to the outside. Each sealing ring groove is equipped with a sealing ring. After the Pel patch 55 is fitted into the sealing ring, it is interference-fitted with the external mounting hole. This ensures that the sealing performance is guaranteed while heat dissipation is achieved. The external mounting holes and the second acquisition holes are staggered, that is, the external mounting holes are set between two adjacent second acquisition holes. The Pel patch 55 and the charge and discharge module 30 form a circuit to achieve a cooling effect. The inner surface of the sealing tube 52 is treated to ensure that it can absorb a certain amount of water even if water enters, ensuring the normal operation of the measurement while drilling sub.

[0062] Two sealing rings are provided at the connection points of the upper cover 1, the outer cylinder 4, and the lower cover 2, which serve as the first sealing function. A sealing ring is also provided between the sealing tube 52 and the upper cover 1 and the lower cover 2, which serves as the second sealing function.

[0063] When the PAL patch 55 is working, the inner side is cooled to reduce the temperature of the mounting cavity 8 inside the sealing tube 52, while the outer side is heated so that the drilling fluid can carry away the heat, ensuring that the unit in the measurement-while-drilling sub can work normally within the allowable temperature range. In this way, as the drilling process progresses, the temperature will continue to increase, and as the temperature gradually rises, it can prevent the unit in the measurement-while-drilling sub from gradually failing.

[0064] Example 9: As an optimization of the above examples, as shown in the appendix Figure 1 , 4 As shown in Figures 5, 6, and 11, an inner annular groove is provided on the inner side of the middle part of the outer cylinder 4. An annular heat insulation cavity is formed between the inner annular groove and the sealing pipe 52, and a heat insulation layer 56 is provided inside the heat insulation cavity.

[0065] As required, the insulation layer 56 is formed by insulation cotton placed inside the insulation cavity. Three connecting blocks are fixedly installed at circumferential intervals at both the upper and lower ends of the insulation cotton. Each connecting block is fixedly installed together with the sealing tube 52. The insulation cotton is located within the annular space inside the outer cylinder. The sealing tube 52 is tightly fitted to the inner wall of the outer cylinder 4 and the inner side of the insulation layer 56. The inner side of the outer cylinder 4 also ensures sufficient contact area with the sealing tube 52, improving sealing performance. This ensures that the insulation layer 56 is not affected.

[0066] A heat insulation layer 56 is installed in the interlayer between the outer cylinder 4 and the sealing tube 52 to isolate most of the external heat and play a heat insulation role. Moreover, the PAL patch 55 cools the inside during operation, reducing the temperature of the installation cavity 8 inside the sealing tube 52. At the same time, it heats the outside, allowing the drilling fluid to carry away the heat, ensuring that the unit in the measurement-while-drilling sub can work normally within the allowable temperature range. In addition, there are through holes on the upper side of the inner cylinder 12, the lower side of the end cap 13, the upper side of the upper partition 14, the upper side of the lower partition 15, and the outer side of the battery box 17. This ensures the flow of temperature and prevents uneven cooling, which can fully realize the cooling effect of the components. In this way, the temperature will continue to increase with the depth during drilling. As the temperature gradually rises, it can effectively prevent the unit in the measurement-while-drilling sub from gradually failing.

[0067] The measurement-while-drilling sub of this application can also be equipped with a vibration sensor as needed to measure the vibration frequency of the measurement-while-drilling sub.

[0068] The measurement-while-drilling (MWD) sub of this application can simultaneously acquire, transmit, and store multiple types of information. It features various sealing measures, a unique charging mechanism, and a cooling device (Parl patch 55), which can significantly extend downhole working time without the need for repeated drilling. The cooling device prevents unit modules from failing due to high temperatures or causing information deviations. The multi-chip system operates independently, improving tool fault tolerance. The magnetic field shielding system ensures the accuracy of information transmission. Multi-point information acquisition prevents errors from single information acquisition, improving information accuracy. The MWD sub of this application has an ingenious structure. Through structural reform and innovation, it significantly improves fault tolerance, extends service life, and reduces drilling costs.

[0069] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A measurement-while-drilling sub, characterized in that... The system includes an upper cover, a lower cover, a core tube, an outer cylinder, a drilling pressure torque and bending moment composite sensor, an internal temperature and pressure sensor, an external temperature and pressure sensor, a power generation unit, a processing unit, and a storage unit. The core tube is fixedly installed at the center of the lower side of the upper cover, and the lower cover is fixedly installed at the lower end of the core tube. An outer cylinder is located outside the core tube; the upper end of the outer cylinder is sealed to the upper cover, and the lower end of the outer cylinder is sealed to the lower cover. An annular mounting cavity is formed between the inner side of the outer cylinder and the outer side of the core tube. Several drilling pressure torque and bending moment composite sensors are evenly distributed circumferentially along the lower outer side of the core tube, and several are evenly distributed circumferentially along the upper inner side of the core tube. There are several first acquisition holes that are connected internally and externally. Each first acquisition hole is equipped with an internal temperature and pressure sensor for collecting the temperature and pressure of the fluid inside the core tube. Several second acquisition holes that are connected internally and externally are evenly distributed along the circumference of the outer cylinder. Each second acquisition hole is equipped with an external temperature and pressure sensor for collecting the temperature and pressure of the fluid outside the outer cylinder. The mounting cavity is equipped with a power generation unit, a processing unit, and a storage unit. The drilling pressure torque and bending moment composite sensor, the internal temperature and pressure sensor, and the external temperature and pressure sensor are all connected to the processing unit. The processing unit is connected to the power generation unit and the storage unit, respectively. Two to four interconnected first acquisition holes are evenly distributed along the circumference of the inner side of the core tube. A second acquisition hole is provided on the outer side of the outer cylinder corresponding to each first acquisition hole. At least two battery boxes are distributed along the circumference between the upper and lower partitions. The power generation unit includes a charging and discharging module, a power management module, a first power generation module, and a second power generation module. One battery box contains the power management module, and at least one battery box contains the charging and discharging module. At least one first power generation module is distributed along the circumference on the lower side of the upper cover corresponding to the position above the inner cylinder. At least one second power generation module with the same structure as the first power generation module is provided on the upper side of the lower cover. Both the first and second power generation modules are connected to the power management module, which is connected to the charging and discharging module. The charging and discharging module is connected to the temperature and pressure processor and the drilling and bending moment processor, respectively. Several vertically penetrating first wiring holes are distributed along the circumference at the lower end of the upper partition. A first limiting sleeve is fixedly installed on the lower side of the upper partition corresponding to each first wiring hole. The lower part of each first limiting sleeve... Each outer side is fitted with a second limiting sleeve, and each second limiting sleeve is fixedly installed together with the upper side of the corresponding battery box. Each first limiting sleeve has a fifth elastic reset component at its lower end and the upper side of the corresponding battery box. Each battery box has a second wire hole on its upper side that corresponds one-to-one with the first wire hole and is connected inside and outside. The lower end of the lower partition has several third wire holes that are distributed vertically and vertically at intervals along the circumference. A third limiting sleeve is fixedly installed on the upper side of the lower partition corresponding to each third wire hole. Each third limiting sleeve has a fourth limiting sleeve fitted on its upper outer side. Each fourth limiting sleeve is fixedly installed together with the lower side of the corresponding battery box. Each third limiting sleeve has a sixth elastic reset component at its upper end and the lower side of the corresponding battery box. Each battery box has a fourth wire hole on its lower side that corresponds one-to-one with the third wire hole and is connected inside and outside. Several upper buffer components are evenly distributed along the circumference between the upper end of the inner cylinder and the lower side of the upper cover. Lower buffer components with the same structure as the upper buffer components and symmetrically distributed are provided between the lower side of the end cover and the upper side of the lower cover. The first power generation module includes a shielding shell, a magnetic box, a shielding pad, a rubber pad, a magnet, a power generation plate, and an insulating sleeve. Several shielding shells are distributed circumferentially at intervals on the lower side of the upper cover. A magnetic box is fixedly installed inside the shielding shell. A shielding pad and a rubber pad are arranged sequentially from top to bottom on the inner side of the upper part of the magnetic box. Two magnets are arranged at intervals from the inside to the outside on the inner side of the magnetic box corresponding to the position below the rubber pad. A power generation plate is arranged between the two magnets. There are gaps between the inner and outer sides of the power generation plate and the two magnets. When the power generation plate moves up and down relative to the magnets, it can output current to the power management module. An insulating sleeve is fitted on the outer side of the end of the power generation plate.

2. The measurement-while-drilling sub according to claim 1, characterized in that... A sleeve fitted onto the outside of the core tube is provided in the mounting cavity corresponding to the position below the internal temperature and pressure sensor. A strip-shaped through hole with internal and external communication is provided on the outside of the sleeve corresponding to the position of the drilling pressure torque and bending moment composite sensor. An inner cylinder is fitted onto the outside of the sleeve. An end cap is fixedly installed between the inner side of the lower end of the inner cylinder and the outer side of the sleeve. An upper partition and a lower partition are installed vertically at intervals between the inner side of the inner cylinder and the outer side of the sleeve, corresponding to the position above the end cap. A first electronic compartment frame is provided between the upper side of the upper partition and the upper inner side of the inner cylinder. A battery box is fixedly installed between the lower side of the upper partition and the upper side of the lower partition. The lower side of the lower partition is fixedly installed between the upper end cap and the... A second electronic chamber frame is fixedly installed between the sides. A support frame is provided between the second electronic chamber frame and the casing. The support frame is fixedly installed together with the end of each drilling pressure torque bending moment composite sensor. The processing unit includes a temperature and pressure processor fixedly installed on the outside of the first electronic chamber frame and a drilling pressure bending moment processor fixedly installed on the outside of the second electronic chamber frame. The inner temperature and pressure sensor and the outer temperature and pressure sensor are both connected to the temperature and pressure processor. The drilling pressure torque bending moment composite sensor is connected to the drilling pressure bending moment processor. The temperature and pressure processor and the drilling pressure bending moment processor are both connected to the power generation unit and the storage unit.

3. The measurement-while-drilling sub according to claim 2, characterized in that... A first mounting ring platform is fixedly installed on the inner side of the upper part of the inner cylinder. The lower end of the first mounting ring platform has a first mounting ring groove with an opening facing downwards. A second mounting ring platform is fixedly installed on the upper side of the upper partition plate. The upper end of the second mounting ring platform has a second mounting ring groove with an opening facing upwards. The upper outer side of the first electronic compartment frame is fitted into the first mounting ring groove. The upper end of the first electronic compartment frame has a first elastic reset member fitted into the first mounting ring groove. The lower outer side of the first electronic compartment frame is fitted into the second mounting ring groove. The lower end of the first electronic compartment frame has a second elastic reset member fitted into the second mounting ring groove. A third mounting ring platform is fixedly installed on the lower side of the lower partition plate. The lower end of the third mounting ring platform has a third mounting ring groove with an opening facing downwards. A fourth mounting ring platform is fixedly installed on the upper side of the end cap. The upper end of the fourth mounting ring platform has a fourth mounting ring groove with an opening facing upwards. The upper outer side of the second electronic compartment frame is fitted into the third mounting ring groove. The upper end of the second electronic compartment frame has a third elastic reset member fitted into the third mounting ring groove. The lower outer side of the second electronic compartment frame is fitted into the fourth mounting ring groove. The lower end of the second electronic compartment frame has a fourth elastic reset member fitted into the fourth mounting ring groove.

4. The measurement-while-drilling sub according to claim 1, characterized in that... The upper buffer assembly includes a limiting post, a venting post, and a seventh elastic reset component. Several vertically penetrating venting holes are distributed at intervals along the circumference of the upper end of the inner cylinder. A hollow limiting post is fixedly installed at the upper end of the inner cylinder corresponding to each venting hole. A tubular venting post is fitted on the outer side of the upper part of each limiting post. Several internally and externally communicating venting holes are evenly distributed at intervals along the circumference of the outer side of the venting post. A seventh elastic reset component is provided between the limiting post and the lower end of the upper cover. Or / and, the battery box is equipped with a counterweight.

5. The measurement-while-drilling sub according to claim 1 or 4, characterized in that... A sealing tube is provided between the inner side of the outer cylinder and the outer side of the inner cylinder. The lower side of the upper cover has a first sealing ring groove and a second sealing ring groove with downward openings spaced from the inside to the outside. The upper side of the lower cover has a third sealing ring groove and a fourth sealing ring groove with upward openings spaced from the inside to the outside. The upper outer side of the sealing tube is fitted into the first sealing ring groove, and the lower outer side of the sealing tube is fitted into the third sealing ring groove. The upper end of the outer cylinder is fixed with a first sealing ring platform fitted into the second sealing ring groove, and the lower end of the outer cylinder is fixed with a second sealing ring platform fitted into the fourth sealing ring groove. The upper and lower outer sides of the outer cylinder are each circumferentially distributed with several external mounting holes extending to the inner side of the sealing tube. Each external mounting hole is sealed and fixedly installed with a Pel patch, which is connected to the charge and discharge module.

6. The measurement-while-drilling sub according to claim 5, characterized in that... The inner side of the middle part of the outer cylinder is provided with an inner ring groove, and an annular heat insulation cavity is formed between the inner ring groove and the sealing tube. A heat insulation layer is provided inside the heat insulation cavity.

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