Drill collar type electromagnetic wave transmission wireless drilling measurement downhole tool

Abstract

This invention relates to the field of measurement while drilling (MWD) technology, specifically a drill collar-type electromagnetic wave transmission wireless MWD downhole tool. It includes a drill collar body, a nested body, a battery module, and a measurement circuit module. A hollow nested body is fitted inside the upper part of the drill collar body. Several first grooves are spaced circumferentially along the outer side of the center of the nested body, each containing a battery module. The measurement circuit module includes a drive module and a sensor module. This invention features a reasonable and compact structure. This drill collar-type electromagnetic wave transmission wireless MWD downhole tool is simple and efficient to operate. It can be docked or disassembled on-site like conventional drilling tools, eliminating the need for cumbersome work such as connecting and tightening measurement sections, measuring angle differences, lifting, wellhead installation, and key alignment with other measurement systems. This saves at least one hour of time. Furthermore, it is handled similarly to conventional drilling tools in terms of transportation and flushing, requiring no meticulous maintenance.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling technology, and is a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool. Background Technology

[0002] In the drilling and development field of the petroleum industry, electromagnetic wave measurement while drilling (MSWD) systems and mud pulse measurement systems are currently the two main types. Their disadvantages include: First, they are complex and time-consuming to operate. Both systems' downhole tools are basically composed of multiple sections, such as battery sections, directional sections, signal-driven sections (pulse generators or electromagnetic wave transmitters), retrieval sections, and fixed sections (keyways or suspensions). During construction, each section needs to be connected end-to-end, and after the drilling tools are connected, the tool is lifted to the wellhead and placed inside the drilling tools using a starter or other equipment. Second, they lack applicability. Both systems' downhole tools are cylindrical with an outer diameter less than 48mm. During construction, they are independent of the drilling tools, requiring the downhole tools to be placed inside the hollow interior of the drilling tools. This reduces the internal area of ​​the drilling tools and makes the circulating fluid flow channels irregular. This makes downhole tools more susceptible to erosion, and when used in high-displacement, high-speed, and high-sand-content environments, tool life is reduced and operating costs increase. Third, the technology is difficult to implement. The mud pulse measurement while drilling system transmits data through the drilling fluid medium. It modulates the signal by changing the size of the internal circulation channels of the drilling tool to achieve pressure fluctuations. Therefore, there is a conflict between the transmission method and the resistance to high erosion in this system. It is impossible to achieve a state where one factor approaches zero. The technical difficulty and cost will be too great. The electromagnetic wave measurement while drilling system uses an electrically excited signal transmission method that is not related to the drilling fluid. The technical difficulty of achieving high erosion resistance and other performance in high-displacement, high-speed environments is not constrained by this aspect.

[0003] Chinese patent document CN206158732U discloses a near-bit drilling attitude measurement device, which includes a measurement sensor and a measurement circuit. The measurement sensor transmits the measurement signal to the measurement circuit, and the measurement circuit processes and calculates the signal to obtain attitude data. The measurement sensor includes a three-axis accelerometer, a three-axis gyroscope, a three-axis magnetometer, and a temperature sensor. The measurement circuit includes an analog-to-digital converter, a field-programmable gate array (FPGA), a memory, a processor, and a low-pass filter. The processor includes an attitude angle calculation module, a quaternion initialization module, and a quaternion update module.

[0004] Chinese patent document CN109268001A discloses a device and method for detecting the rotation angle of horizontal principal stress direction during drilling, a combined measurement-while-drilling tool, including: measurement-while-drilling tool A, measurement-while-drilling tool B, and a non-magnetic drill collar; measurement-while-drilling tool B obtains measurement data based on a magnetic sensor and an accelerometer, and is installed in the middle of the non-magnetic drill collar; measurement-while-drilling tool A includes a gyroscope; measurement-while-drilling tool A is located in front of measurement-while-drilling tool B and is connected to the drill bit.

[0005] Chinese patent document CN118958955A discloses a measurement-while-drilling sub, which includes a sub body, a casing, and electronic components. A first mounting groove is formed on the outer wall of the sub body, which can accommodate the electronic components. The casing is fixedly sleeved on the outer wall of the sub body, and the casing can cover the first mounting groove. The inner walls at both ends of the casing are sealed to the outer wall of the sub body.

[0006] With the increasing demand for more refined drilling operations and higher drilling efficiency, drilling technology requires blind-spot-free trajectory measurement and trace recording. In the initial stage of drilling (vertical well section), precise monitoring and fine control of the trajectory are required without reducing drilling efficiency. The initial stage of drilling (vertical well section) is characterized by a high-displacement, high-speed, strong erosion, and high sand content working environment. This places higher technical requirements on the supporting measurement-while-drilling downhole tools in terms of high vibration resistance, high impact resistance, high erosion resistance, and high performance.

[0007] Most current measurement-while-drilling (MWD) downhole tools are developed for environments with low displacement, conventional rotation speed, and low sand content during the mid-stage of drilling operations. When applied to the early stage of drilling, these tools are overloaded under excessive capacity, resulting in high tool failure rates, frequent maintenance, and high costs. Furthermore, during drilling, the downhole drilling tool and the MWD downhole tool work independently yet in conjunction to achieve trajectory monitoring and control. The way the MWD downhole tool is placed in the hollow internal cavity of the downhole drilling tool further reduces the flow area and exacerbates the erosion effect. Summary of the Invention

[0008] This invention provides a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool, which overcomes the shortcomings of the prior art and can effectively solve the problem of complex operation and long operation time of existing measurement while drilling tools.

[0009] The technical solution of the present invention is achieved through the following measures: a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool, including a drill collar body, a nested body, a battery module and a measurement circuit module. A hollow nested body is fitted on the inner side of the upper part of the drill collar body. Several first grooves are distributed circumferentially on the outer side of the middle part of the nested body. A battery module is installed in each first groove. The measurement circuit module includes a drive module and a sensor module. A second groove is provided on the outer side of the nested body corresponding to the position between two of the first grooves. The drive module and the sensor module are installed in the second groove. The battery module supplies power to the drive module and the sensor module. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them and then sends them to the surface.

[0010] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0011] The above may also include a tubular insulated antenna with a limiting step surface on the upper part. An external connecting thread is provided on the outer side of the insulated antenna corresponding to the position above the limiting step surface. An insulating layer is provided on the surface of the limiting step surface, the surface of the external connecting thread, and the upper end of the insulated antenna. An internal connecting thread matching the external connecting thread is provided on the inner side of the lower part of the drill collar body. The outer side of the upper part of the insulated antenna is screwed to the inner side of the lower part of the drill collar body. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them, and then transmits them to the ground through the insulated antenna.

[0012] The aforementioned sensor module may include a sampling and processing submodule, an X accelerometer, a Y accelerometer, a Z accelerometer, an X magnetic sensor, a Y magnetic sensor, a Z magnetic sensor, and a temperature sensor. The sampling and processing submodule includes a filtering circuit, an A / D conversion circuit, a core processing unit, and a serial communication unit.

[0013] The X-accelerometer, Y-accelerometer, Z-accelerometer, X-magnetic sensor, Y-magnetic sensor, Z-magnetic sensor, and temperature sensor collect corresponding sensor component data. The filtering circuit and A / D conversion circuit sequentially filter and convert the sensor component data. The core processing unit obtains the measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

[0014] The aforementioned drive module may include a digital modulation circuit, a communication main control circuit, and a vibration detection circuit;

[0015] The vibration detection circuit detects the static and dynamic states of the nested body and transmits the detection data to the communication main control circuit in the form of digital level signals.

[0016] The main communication control circuit completes data interaction between the digital modulation circuit and the vibration detection circuit, and between the digital modulation circuit and the sensor module, through various communication methods.

[0017] The digital modulation circuit uses PWM modulation technology to modulate and encode the received data, and then transmits it to the ground in the form of electromagnetic waves through an insulated antenna.

[0018] The aforementioned battery module may include a power conversion circuit and multiple parallel battery packs. The multiple parallel battery packs are connected to the power conversion circuit. Each battery pack includes eight individual cells and a battery protection module. The eight individual cells and the battery protection module are connected in series. The power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

[0019] The upper outer side and lower outer side of the above-mentioned nested body can be fixed with sealing ring platforms. At least one sealing ring is provided between the sealing ring platform and the drill collar body at vertical intervals. The lower inner side of the drill collar body is fixed with a support ring platform that is in contact with the lower end of the sealing ring platform.

[0020] Each of the above battery modules may be provided with a first shock-absorbing spring between its upper and lower sides and the inner wall of the first groove, and a second shock-absorbing spring may be provided between its upper and lower sides and the inner wall of the second groove. At least one shock-absorbing pad may be provided vertically between the measurement circuit module and the adjacent battery modules, as well as between two adjacent battery modules.

[0021] This invention features a reasonable and compact structure. When this drill collar-type electromagnetic wave transmission wireless measurement-while-drilling downhole tool is used (by installing the tool on the drill string), the sensor module can collect measurements of key parameters such as well inclination angle, azimuth angle, and tool face angle, enabling simultaneous drilling and measurement. The drive module encodes the measurement data and transmits it to the ground receiver via an antenna in the form of electromagnetic waves. The ground receiver picks up the signal and performs filtering, acquisition, and other processing before transmitting it at high speed to the data processing software for data decoding, recovery, and display. It can be applied to tracking and measuring the well trajectory and geological information of vertical, directional, and horizontal wells in drilling and development, enabling real-time and precise measurement and fine-grained control of the drilling trajectory, thus achieving precise drilling.

[0022] This application has the following advantages over current measurement-while-drilling systems:

[0023] First, it is simple and efficient to operate. The drill collar electromagnetic wave transmission wireless measurement while drilling downhole tool is an integrated design that combines multiple functions into one drill collar. It can be docked or disassembled on site like a conventional drilling tool. It does not require other measurement systems to first connect and tighten the various measurement sections, measure the angle difference, lift, install at the wellhead, and align the key positions, etc., which can save at least 1 hour of time. At the same time, it is the same as a conventional drilling tool in terms of transportation and flushing, and does not require fine maintenance.

[0024] Secondly, it has strong applicability. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool has a smooth streamlined design with the same diameter on both the inside and outside. It can fully adapt to the construction environment of large displacement of 100 liters / second and high speed of 110 rpm. It also has stronger resistance to erosion and vibration, which reduces the operating cost of the tool, reduces the frequency of maintenance, increases the service life of the tool, and saves the consumption of spare parts. It can adapt to the construction of any well section in a project, and can adapt to the well conditions of leakage wells and underbalanced drilling conditions where drilling and plugging are carried out simultaneously, which greatly improves drilling efficiency.

[0025] Third, it has a high transmission rate, with a maximum transmission rate of 6.25bps. Attached Figure Description

[0026] Appendix Figure 1 These are schematic diagrams of the main view and half-section structure of embodiments one to seven of the present invention.

[0027] Appendix Figure 2 This is a top sectional view of the nested structure in Embodiments 1 to 7 of the present invention.

[0028] Appendix Figure 3 The diagram shows the circuit structure of the device according to embodiments one through seven of the present invention.

[0029] Appendix Figure 4 The diagram shows the circuit structure of the sensor module in embodiments one through seven of the present invention.

[0030] Appendix Figure 5 The diagram shows the circuit structure of the driving module in embodiments one through seven of the present invention.

[0031] Appendix Figure 6 These are schematic diagrams of the battery module structures in embodiments one through seven of the present invention.

[0032] The codes in the attached diagram are as follows: 1 is the drill collar body, 2 is the nested body, 3 is the first groove, 4 is the second groove, 5 is the insulated antenna, 6 is the transition step surface, 7 is the limiting step surface, 8 is the insulating layer, 9 is the connecting cylinder, 10 is the battery pack, 11 is the measuring circuit module, 12 is the sealing ring platform, 13 is the sealing ring, 14 is the support ring platform, 15 is the first wire hole, 16 is the second wire hole, 17 is the third wire hole, 18 is the fourth wire hole, 19 is the first shock-absorbing spring, 20 is the second shock-absorbing spring, and 21 is the shock-absorbing pad. Detailed Implementation

[0033] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0034] 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 1The 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.

[0035] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0036] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool includes a drill collar body 1, a nested body 2, a battery module, and a measurement circuit module 11. The upper inner side of the drill collar body 1 is fitted with a hollow nested body 2. Several first grooves 3 are distributed circumferentially on the outer side of the middle part of the nested body 2. Each first groove 3 is equipped with a battery module. The measurement circuit module 11 includes a drive module and a sensor module. A second groove 4 is provided on the outer side of the nested body 2 corresponding to the position between two first grooves 3. The second groove 4 is equipped with a drive module and a sensor module. The battery module supplies power to the drive module and the sensor module. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them, and then sends them to the surface.

[0037] According to requirements, both the drill collar body 1 and the nesting body 2 are made of non-magnetic material. The first groove 3 can be an arc shape with the opening facing outward, so that it can be matched with the existing cylindrical battery. The number of first grooves 3 can be 10. The cross-section of the second groove 4 can be rectangular to facilitate the installation of the measurement circuit module 11. The nesting body 2 adopts a Gatling ballistic design. The outer side of the nesting body 2 is a conical surface with a larger top and a smaller bottom, with a taper of 1 to 4 degrees. In this embodiment, the taper can be 3 degrees, that is, the angle between the outer side of the nesting body 2 and the vertical surface is 1.5 degrees. This makes it easy for the nesting body 2 to fit into the drill collar body 1. In use, it is connected to the drill tool on the upper inner side of the drill collar body 1. After the nesting body 2 and the drill collar shell are installed, they can be sealed and pressure-bearing, realizing that the drill collar type electromagnetic wave transmission wireless measurement downhole tool can both circulate drilling fluid internally and directly interconnect with other conventional drilling tools.

[0038] When this drill collar-type electromagnetic wave transmission wireless measurement-while-drilling downhole tool is in use (the drill collar-type electromagnetic wave transmission wireless measurement-while-drilling downhole tool is installed on the drill string), the sensor module can collect measurements of key parameters such as well inclination angle, azimuth angle, and tool face angle, enabling measurement while drilling. The drive module encodes the measurement data and transmits it to the ground receiver in the form of electromagnetic waves. The ground receiver picks up the signal and performs filtering, acquisition, and other processing before transmitting it at high speed to the data processing software for data decoding, recovery, and display. It can be applied to the tracking and measurement of well trajectory and geological information in drilling and development of vertical wells, directional wells, and horizontal wells, enabling real-time and precise measurement and fine control of the drilling trajectory to achieve precise drilling.

[0039] This drill collar-type electromagnetic wave transmission wireless measurement while drilling downhole tool is simple and efficient to operate. It can be docked or disassembled on-site like conventional drilling tools, without the need for other measurement systems to first connect and tighten the various measurement sections, measure angular differences, lift, install at the wellhead, and align the key positions. It can save at least 1 hour of time. At the same time, it is the same as conventional drilling tools in terms of transportation and flushing, and does not require meticulous maintenance.

[0040] The above-mentioned drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool 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. Figure 1 As shown, it also includes a tubular insulated antenna 5. The upper part of the insulated antenna 5 is provided with a limiting step surface 7. The outer side of the insulated antenna 5 corresponding to the position above the limiting step surface 7 is provided with an external connecting thread. The surface of the limiting step surface 7, the surface of the external connecting thread, and the upper end of the insulated antenna 5 are all provided with an insulating layer 8. The lower inner side of the drill collar body 1 is provided with an internal connecting thread that matches the external connecting thread. The upper outer side of the insulated antenna 5 is screwed to the lower inner side of the drill collar body 1. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them, and then transmits them to the ground through the insulated antenna 5.

[0042] According to requirements, a connecting cylinder 9 is screwed to the lower end of the drill collar body 1. The upper outer side of the connecting cylinder 9 is screwed to the lower inner side of the drill collar body 1. A transition step surface 6 is provided on the lower inner side of the connecting cylinder 9. A transition internal thread matching the external connecting thread is provided on the lower inner side of the connecting cylinder 9 below the transition step surface 6. An insulating layer 8 is provided on the surface of the transition step surface 6, the surface of the transition internal thread, the lower end of the connecting cylinder 9, the surface of the limiting step surface 7, the surface of the external connecting thread, and the upper end of the insulating antenna 5. The insulating layer 8 is an existing type. The non-metallic formations, such as those sprayed on the transition step surface 6, the transition internal thread surface, the lower end of the connecting cylinder 9, the limiting step surface 7, the external connecting thread surface, and the upper end of the insulating antenna 5, are known technologies. The non-metallic formations are ceramics. The upper outer side of the insulating antenna 5 is screwed to the lower inner side of the connecting cylinder 9. Both the upper and lower ends of the drill collar body 1 are made of female threads. The lower end of the drill collar body 1 and the upper end of the connecting cylinder 9, as well as the lower end of the connecting cylinder 9 and the upper end of the insulating antenna 5, are in contact with the coaxial sealing surfaces of the step surface and the end face.

[0043] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 4 As shown, the sensor module includes a sampling and processing submodule, an X accelerometer, a Y accelerometer, a Z accelerometer, an X magnetic sensor, a Y magnetic sensor, a Z magnetic sensor, and a temperature sensor. The sampling and processing submodule includes a filtering circuit, an A / D conversion circuit, a core processing unit, and a serial communication unit.

[0044] The X-accelerometer, Y-accelerometer, Z-accelerometer, X-magnetic sensor, Y-magnetic sensor, Z-magnetic sensor, and temperature sensor collect corresponding sensor component data. The filtering circuit and A / D conversion circuit sequentially filter and convert the sensor component data. The core processing unit obtains the measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

[0045] The X, Y, and Z accelerometers mentioned above can all use the ADXL series dual-axis micromechanical accelerometer chip, with a measurement range of ±2.5g, low power consumption, and single power supply. The three accelerometers can achieve a three-dimensional layout and coordinate system with two orthogonal components, and respond to the Earth's gravitational field with three-coordinate component vectors.

[0046] The X, Y, and Z magnetic sensors mentioned above can all be single-axis MEMS sensors with a measurement range of up to 2 guss. They are powered by a single low-power supply and are orthogonal to each other in the same coordinate system as the accelerometer, providing a three-coordinate component vector response to the Earth's magnetic field.

[0047] The aforementioned sampling and processing submodule includes a filtering circuit, an A / D conversion circuit, a core processing unit, and a serial communication unit. The filtering circuit can be a low-pass filter with a low-pass cutoff frequency of 30Hz and a gain of 5x. The A / D conversion circuit can be a 12-bit high-precision 8-channel analog-to-digital conversion circuit. The core processing unit can be a low-power embedded CPU that performs secondary filtering on the six received sensor components and calculates the corresponding engineering values ​​of well inclination angle, azimuth angle, tool face angle, and other measurement parameters. The calculation process here is based on existing known technology. The serial communication unit transmits the measurement parameters to the driver module based on TTL communication.

[0048] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 5 As shown, the drive module includes a digital modulation circuit, a communication main control circuit, and a vibration detection circuit;

[0049] The vibration detection circuit detects the static and dynamic states of the nested body 2 and transmits the detection data to the communication main control circuit in the form of digital level signals.

[0050] The main communication control circuit completes data interaction between the digital modulation circuit and the vibration detection circuit, and between the digital modulation circuit and the sensor module, through various communication methods.

[0051] The digital modulation circuit uses PWM modulation technology to modulate and encode the received data, and then transmits it to the ground in the form of electromagnetic waves through the insulated antenna 5.

[0052] The vibration detection circuit mentioned above includes an accelerometer, a monostable circuit, and a comparator. The accelerometer is connected to the comparator, and the comparator is connected to the monostable circuit. Based on the accelerometer's sensitive response characteristics to the static and dynamic states of objects in a dynamic environment, the comparator and monostable circuit capture the motion, thereby detecting the static and dynamic states of the nested body 2 and outputting it to the communication main control circuit as a digital level signal.

[0053] The aforementioned communication main control circuit includes an RS485 module, a TTL module, and an embedded low-power CPU. The embedded low-power CPU is connected to both the RS485 and TTL modules, providing multiple communication modes such as logic level, TTL, and RS485. The aforementioned digital modulation circuit includes an embedded low-power CPU and a MOSFET. It uses PWM modulation technology to modulate and encode the received data. This design realizes a miniaturized integrated circuit board design. Furthermore, it can sample the output data for automatic and controllable closed-loop control. The modulated and encoded data is directly fed to the two poles of the insulated antenna 5 and transmitted to the ground in the form of electromagnetic waves.

[0054] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 6, the battery module includes a power conversion circuit and multiple parallel battery packs 10. The multiple parallel battery packs 10 are connected to the power conversion circuit. Each battery pack 10 includes eight individual cells and a battery protection module. The eight individual cells and the battery protection module are connected in series. The power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

[0055] Each of the above battery packs 10 includes eight individual cells and a battery protection module; the individual cells can be 18170 type disposable lithium cells, and the battery pack 10 is plastically formed into cylindrical cells with a diameter of 20mm and a length of 1.2m, with a total voltage of 29V and a battery capacity of 10AH; the battery protection module is a known technology and can realize reverse charging protection, overcurrent protection, etc.

[0056] The aforementioned power conversion circuit includes an EMI filtering submodule and a DC / DC submodule, which respectively implement EMI filtering and DC / DC conversion technologies, achieving a conversion efficiency of over 80% and a temperature fluctuation of no more than 50mV, realizing multi-channel power conversion of high and low voltage DC±15V and DC±5V.

[0057] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 2 As shown, sealing ring platforms 12 are fixed on the upper outer side and lower outer side of the nested body 2. At least one sealing ring 13 is provided between the sealing ring platform 12 and the drill collar body 1 at vertical intervals. A support ring platform 14 is fixed on the lower inner side of the drill collar body 1, which is in contact with the lower end of the sealing ring platform 12.

[0058] The first groove 3 and the second groove 4 are located on the outside of the nested body 2 between the two sealing ring platforms 12. To facilitate the connection between the drive module and the insulating antenna 5, a first through hole 15 is provided on the lower outer side of the drill collar body 1 corresponding to the position of the second groove 4. The lower end of the drill collar body 1 is provided with a second through hole 16 whose upper end communicates with the first through hole 15. A sealing plug is fixedly installed on the inner side of the outer side of the first through hole 15. This facilitates the processing of the first through hole 15 and the connection between the drive module and the insulating antenna 5. The lower end of the connecting cylinder 9 is provided with a third through hole 17 that is vertically through and communicates with the second through hole 16. The limiting step surface 7 of the insulating antenna 5 is provided with a fourth through hole 18 that communicates with the third through hole 17. The lower inner side of the second through hole 16 and the upper inner side of the third through hole 17 are connected. Both the side and the inner upper part of the fourth wire hole 18 are sealed with existing known sealing joints, such as single-core spring type sealing wire or single-core spring type mechanical seal. The sealing joint can seal the lower end of the second wire hole 16 with the upper end of the third wire hole 17, the lower end of the third wire hole 17 and the upper end of the fourth wire hole 18. The lower end of the connecting wire passes through the second wire hole 16, the upper sealing joint, the third wire hole 17, the lower sealing joint and the fourth wire hole 18 in sequence and is connected to the insulated antenna 5. The upper end of the connecting wire passes through the first wire hole 15 and is connected to the digital modulation circuit. The sealing joint can realize the isolation of the connecting wire from the insulation layer 8 and the power supply connection. The setting of two sealing ring platforms 12, and the setting of double radial sealing rings 13 on the sealing ring platform 12 to realize the isolation of the battery module and the measurement circuit module 11 from the internal and external fluids.

[0059] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, each battery module is provided with a first shock-absorbing spring 19 between its upper and lower sides and the inner wall of the first groove 3, and a second shock-absorbing spring 20 is provided between its upper and lower sides and the inner wall of the second groove 4. At least one shock-absorbing pad 21 is provided vertically between the measurement circuit module 11 and the adjacent battery module, as well as between two adjacent battery modules.

[0060] According to requirements, a circuit board is provided in the second groove 4, and the measurement circuit module 11 is mounted on the circuit board. The shock-absorbing pad 21 is set between the circuit board and the adjacent battery module and between two adjacent battery modules. The first shock-absorbing spring 19 is set in the first groove 3, and the second shock-absorbing spring 20 is set in the second groove 4 to achieve axial shock absorption. The upper ends of the upper first shock-absorbing spring 19 and the upper second shock-absorbing spring 20 can also contact the lower end of the upper sealing ring platform 12. The lower ends of the lower first shock-absorbing spring 19 and the lower second shock-absorbing spring 20 can also contact the upper end of the lower sealing ring platform 12. The shock-absorbing pad 21 can achieve lateral shock absorption. This can reduce the impact of tool vibration on the battery module and the measurement circuit module 11 during use. The length of the drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool is no more than 2m.

[0061] This application has the following advantages over current measurement-while-drilling systems:

[0062] First, it is simple and efficient to operate. The drill collar electromagnetic wave transmission wireless measurement while drilling downhole tool is an integrated design that combines multiple functions into one drill collar. It can be docked or disassembled on site like a conventional drilling tool. It does not require other measurement systems to first connect and tighten the various measurement sections, measure the angle difference, lift, install at the wellhead, and align the key positions, etc., which can save at least 1 hour of time. At the same time, it is the same as a conventional drilling tool in terms of transportation and flushing, and does not require fine maintenance.

[0063] Secondly, it has strong applicability. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool has a smooth streamlined design with the same diameter on both the inside and outside. It can fully adapt to the construction environment of large displacement of 100 liters / second and high speed of 110 rpm. It also has stronger resistance to erosion and vibration, which reduces the operating cost of the tool, reduces the frequency of maintenance, increases the service life of the tool, and saves the consumption of spare parts. It can adapt to the construction of any well section in a project, and can adapt to the well conditions of leakage wells and underbalanced drilling conditions where drilling and plugging are carried out simultaneously, which greatly improves drilling efficiency.

[0064] Third, it has a high transmission rate, with a maximum transmission rate of 6.25bps.

[0065] 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.

[0066] The preferred embodiment of the drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool of the present invention is as follows:

[0067] Step 1: The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool is installed on the drill string and then lowered downhole to advance with the drill string;

[0068] Step 2: The X, Y, and Z accelerometers collect the three-coordinate component vectors of the Earth's gravitational field;

[0069] Step 3: The X-magnetic sensor, Y-magnetic sensor, and Z-magnetic sensor acquire the three-coordinate component vectors of the Earth's magnetic field;

[0070] Step four: The filtering circuit and the A / D conversion circuit sequentially filter and convert the three-coordinate component vectors of the Earth's gravity field and the three-coordinate component vectors of the Earth's magnetic field.

[0071] Step 5: The core processing unit performs secondary filtering on the processed data and then calculates the corresponding measurement parameters such as well inclination angle, azimuth angle, and tool face angle.

[0072] Step six: The vibration detection circuit detects the static and dynamic states of the nested body 2;

[0073] Step 7: The measured parameters such as well inclination angle, azimuth angle, and tool face angle from Step 5 are transmitted to the digital modulation circuit through the serial communication unit and the main communication control circuit. The static and dynamic states of the nested body 2 from Step 6 are output to the digital modulation circuit as digital level signals through the main communication control circuit.

[0074] Step 8: The digital modulation circuit uses PWM modulation technology to modulate and encode the received data, and then transmits it to the ground in the form of electromagnetic waves through the insulated antenna 5.

[0075] Step nine: After receiving the information, the ground equipment filters, decodes, and displays it to obtain downhole data during the drilling process.

[0076] This method can be applied to environments with high displacement, high rotation speed, strong erosion, and high sand content, where drilling is carried out entirely using anti-deviation drilling and vertical well sections. It can complete the measurement of key parameters such as well inclination angle, azimuth angle, and tool face angle, realizing simultaneous drilling and measurement. The measurement data is encoded and transmitted to the ground receiving end in the form of electromagnetic waves via an antenna. The ground receiving end equipment picks up the signal and performs filtering, acquisition, and other processing before transmitting it at high speed to the data processing software for data decoding, recovery, and display. It can be applied to the tracking and measurement of well trajectory and geological information in drilling and development of vertical wells, directional wells, and horizontal wells, enabling real-time and precise measurement and fine control of the drilling trajectory to achieve precise drilling.

Claims

1. A drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool, characterized in that... The system includes a drill collar body, a nested body, a battery module, and a measurement circuit module. The upper inner side of the drill collar body is fitted with a hollow nested body. Several first grooves are distributed circumferentially on the outer side of the middle of the nested body. A battery module is installed in each first groove. The measurement circuit module includes a drive module and a sensor module. A second groove is provided on the outer side of the nested body corresponding to the position between two of the first grooves. The drive module and the sensor module are installed in the second groove. The battery module supplies power to the drive module and the sensor module. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them, and then sends them to the ground. It also includes a tubular insulated antenna with a limiting step surface on the upper part of the insulated antenna. An external connecting thread is provided on the outer side of the insulated antenna corresponding to the position above the limiting step surface. An insulating layer is provided on the surface of the limiting step surface, the surface of the external connecting thread, and the upper end of the insulated antenna. An internal connecting thread matching the external connecting thread is provided on the inner side of the lower part of the drill collar body. The outer side of the upper part of the insulated antenna is screwed to the inner side of the lower part of the drill collar body. The drive module receives the measurement parameters transmitted by the sensor module, modulates and encodes them, and then transmits them to the ground through the insulated antenna. The outer side of the nested body is a cone-shaped surface that is larger at the top and smaller at the bottom, with a taper of 1 to 4 degrees.

2. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 1, characterized in that... The sensor module includes a sampling and processing submodule, an X accelerometer, a Y accelerometer, a Z accelerometer, an X magnetic sensor, a Y magnetic sensor, a Z magnetic sensor, and a temperature sensor. The sampling and processing submodule includes a filtering circuit, an A / D conversion circuit, a core processing unit, and a serial communication unit. The X-accelerometer, Y-accelerometer, Z-accelerometer, X-magnetic sensor, Y-magnetic sensor, Z-magnetic sensor, and temperature sensor collect corresponding sensor component data. The filtering circuit and A / D conversion circuit sequentially filter and convert the sensor component data. The core processing unit obtains the measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

3. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 2, characterized in that... The drive module includes a digital modulation circuit, a communication main control circuit, and a vibration detection circuit; The vibration detection circuit detects the static and dynamic states of the nested body and transmits the detection data to the communication main control circuit in the form of digital level signals. The main communication control circuit completes data interaction between the digital modulation circuit and the vibration detection circuit, and between the digital modulation circuit and the sensor module, through various communication methods. The digital modulation circuit uses PWM modulation technology to modulate and encode the received data, and then transmits it to the ground in the form of electromagnetic waves through an insulated antenna.

4. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 1, 2, or 3, characterized in that... The battery module includes a power conversion circuit and multiple parallel battery packs. The multiple parallel battery packs are connected to the power conversion circuit. Each battery pack includes eight individual cells and a battery protection module. The eight individual cells and the battery protection module are connected in series. The power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

5. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 1, 2, or 3, characterized in that... Sealing ring platforms are fixed on the upper and lower outer sides of the nested body. At least one sealing ring is provided between the sealing ring platform and the drill collar body at vertical intervals. A support ring platform is fixed on the lower inner side of the drill collar body, which is in contact with the lower end of the sealing ring platform below.

6. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 4, characterized in that... Sealing ring platforms are fixed on the upper and lower outer sides of the nested body. At least one sealing ring is provided between the sealing ring platform and the drill collar body at vertical intervals. A support ring platform is fixed on the lower inner side of the drill collar body, which is in contact with the lower end of the sealing ring platform below.

7. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 1, 2, or 6, characterized in that... Each battery module is provided with a first shock-absorbing spring between its upper and lower sides and the inner wall of the first groove. The measurement circuit module is provided with a second shock-absorbing spring between its upper and lower sides and the inner wall of the second groove. At least one shock-absorbing pad is provided vertically between the measurement circuit module and the adjacent battery module, as well as between two adjacent battery modules.

8. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool according to claim 5, characterized in that... Each battery module is provided with a first shock-absorbing spring between its upper and lower sides and the inner wall of the first groove. The measurement circuit module is provided with a second shock-absorbing spring between its upper and lower sides and the inner wall of the second groove. At least one shock-absorbing pad is provided vertically between the measurement circuit module and the adjacent battery module, as well as between two adjacent battery modules.

Images