Drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool

Abstract

The invention relates to the technical field of measurement while drilling, in particular to a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool which comprises a drill collar body, a nested body, a battery module and a measuring circuit module, the inner side of the upper portion of the drill collar body is sleeved with the nested body of a hollow structure, and a plurality of first grooves are distributed in the outer side of the middle of the nested body at intervals along the circumference; a battery module is installed in each first groove, and the measuring circuit module comprises a driving module and a sensor module. The drill collar type electromagnetic wave transmission wireless measurement-while-drilling downhole tool is reasonable and compact in structure and easy and efficient to operate, butt joint or disassembly can be conducted on site like a conventional drilling tool, tedious work such as mutual connection and tightening of measuring short sections, angle difference measurement, hoisting, wellhead installation and seat key position alignment of other measuring systems is not needed, and the working efficiency is improved. Meanwhile, the drilling tool is the same as a conventional drilling tool in the aspects of transportation, washing and the like, and fine maintenance is not needed.

Description

Technical Field

[0001] The invention relates to the technical field of measurement while drilling, in particular to a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool. Background Art

[0002] In the field of drilling and development in the oil industry, the electromagnetic wave measurement while drilling system and the mud pulse measurement system are currently the main ones. Their disadvantages are as follows: First, the operation is complicated and time-consuming. The downhole tools of the two systems are basically composed of multiple short sections, such as battery short sections, directional short sections, signal drive short sections (pulser or electromagnetic wave transmitter), fishing short sections, fixed short sections (seat key or suspension), etc. During construction, each short section needs to be connected in series, and then the tool needs to be hoisted to the wellhead with a starter and other equipment after the drilling tool is connected. Place it inside the drill tool; second, the applicability is insufficient. The downhole tools of the two systems are cylindrical in form with an outer diameter of less than 48mm. During construction, they are independent of the drilling tool and need to be placed inside the hollow part of the drill tool. On the one hand, this reduces the internal hollow area of ​​the drill tool and on the other hand, it causes the circulating fluid flow path to become irregular. This makes downhole tools more susceptible to erosion. At the same time, when used in large-volume, high-speed, and high-sand environments, the tool life is shortened and the cost of use increases. Third, the technology is difficult to implement. The mud pulse measurement while drilling system uses the drilling circulating fluid medium to complete data transmission, and changes the size of the empty circulating fluid flow channel in the drill bit to achieve pressure fluctuations for signal modulation. Therefore, there is a conflict between the transmission method and high-erosion resistance of this system, and it is impossible to achieve a state where one of the factors approaches zero. The difficulty and cost of technical implementation 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 circulating fluid. The difficulty in technical implementation of achieving performance such as high-erosion resistance in a large-volume and high-speed environment is not restricted by this aspect.

[0003] Chinese patent document CN206158732U discloses a near-bit drill tool attitude measurement while drilling device, which includes a measurement sensor and a measurement circuit. The measurement sensor transmits a measurement signal to the measurement circuit, which processes and calculates the signal to obtain attitude data; the measurement sensor includes a three-axis accelerometer, a three-axis gyroscope, a three-axis magnetic sensor 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 publication number CN109268001A discloses a device and method for detecting the rotation angle of a horizontal principal ground stress direction while drilling measurement. The device comprises a combined while drilling measurement tool, including: a while drilling measurement tool A, a while drilling measurement tool B, and a non-magnetic drill collar; the while drilling measurement tool B obtains measurement data based on a magnetic sensor and an accelerometer, and the while drilling measurement tool B is installed in the middle of the non-magnetic drill collar; the while drilling measurement tool A includes a gyroscope; the while drilling measurement tool A is arranged in front of the while drilling measurement tool B, and the while drilling measurement tool A is connected to the drill bit.

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

[0006] With the demand for refined operations and improved drilling efficiency in drilling projects, drilling technology requires the realization of trajectory measurement and trace-keeping without blind spots. In the initial stage of drilling construction (vertical well section), the trajectory must be accurately monitored and finely controlled without reducing drilling efficiency. The initial stage of construction (vertical well section) is characterized by a large displacement, high speed, strong erosion, and high sand content. This puts forward higher technical requirements for the supporting downhole measurement tools in terms of high vibration resistance, high impact resistance, high erosion resistance and high performance.

[0007] At present, most of the downhole measurement while drilling tools are mainly developed for small displacement, conventional speed, low sand content and other environments in the mid-term operation stage of construction. When applied to the initial stage of construction, the tools are overloaded under the exceeding capacity, resulting in high tool failure rate, high maintenance frequency, high consumption cost and other problems. At the same time, during the construction process, the downhole drill bit and the downhole measurement while drilling tool are independent of each other and cooperate to realize trajectory monitoring and control. The downhole measurement while drilling tool is placed in the hollow internal cavity of the downhole drill bit, which further reduces the flow area and aggravates the erosion effect. Summary of the Invention

[0008] The present invention provides a drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool, which overcomes the above-mentioned shortcomings of the existing technology and can effectively solve the problem of complex and time-consuming operation of the 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 downhole measurement tool, including a drill collar body, a nested body, a battery module and a measurement circuit module. A hollow nested body is mounted on the inner side of the upper part of the drill collar body, and a plurality of first grooves are distributed along the circumference 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 provided 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, and sends them to the ground after modulation and encoding.

[0010] The following are further optimizations and / or improvements to the above technical solutions: The above may also include an insulating antenna with a tubular structure, a limiting step surface is provided on the upper part of the insulating antenna, an external connecting thread is provided on the outer side of the insulating antenna corresponding to the position above the limiting step surface, the limiting step surface surface, the external connecting thread surface and the upper end of the insulating antenna are all provided with an insulating layer, 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 insulating antenna is screwed to the inner side of the lower part of the drill collar body, the driving module receives the measurement parameters transmitted by the sensor module, and sends them to the ground via the insulating antenna after modulating and encoding them.

[0011] The sensor module may include a sampling 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 processing submodule includes a filtering processing 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 processing circuit and the A / D conversion circuit sequentially filter and perform A / D conversion on the sensor component data. The core processing unit obtains measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

[0012] The driving module may include a digital modulation circuit, a communication main control circuit and a vibration detection circuit; The vibration detection circuit detects the static state and motion state of the nested body and transmits the detection data to the communication main control circuit in the form of digital level signals; The communication main 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 sends it to the ground in the form of electromagnetic waves through an insulating antenna.

[0013] The above-mentioned 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 single cells and a battery protection module, the eight single cells and the battery protection module are connected in series in sequence, and the power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

[0014] A sealing ring platform can be fixed to the outer side of the upper part and the lower part of the above-mentioned nested body. At least one sealing ring is arranged between the sealing ring platform and the drill collar body. A supporting ring platform is fixed to the inner side of the lower part of the drill collar body and contacts the lower end of the sealing ring platform below.

[0015] A first shock-absorbing spring may be provided between the upper and lower sides of each of the above-mentioned battery modules and the inner wall of the first groove, a second shock-absorbing spring may be provided between the upper and lower sides of the measurement circuit module and the inner wall of the second groove, and at least one shock-absorbing pad may be provided between the measurement circuit module and the battery module in the adjacent position and between two adjacent battery modules.

[0016] The present invention has a reasonable and compact structure. When the 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 tool), the sensor module can collect measurements of main parameters such as well inclination, azimuth, tool face angle, etc., and realize measurement while drilling. The drive module encodes the measurement data and transmits it to the ground receiving end in the form of electromagnetic waves through the antenna. The ground receiving end picks up the signal and performs filtering, collection and other processing, and then transmits it to the data processing software at high speed for data decoding, recovery and display functions. It can be applied to the tracking measurement of wellbore trajectories and geological information of vertical wells, directional wells, horizontal wells and other wells in drilling development, and performs real-time and accurate measurement and fine control of the drilling trajectory to achieve precise drilling.

[0017] Compared with the current measurement while drilling system, this application has the following advantages: First, the operation is simple and efficient. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool is an integrated design, integrating multiple functions into a drill collar drill tool. It can be docked or disassembled on site like conventional drilling tools. It does not require other measurement systems to first connect and tighten the various measuring short sections, measure angle differences, lift, install at the wellhead, and key the seats. This can save at least one hour of time. At the same time, in terms of transportation and flushing, it is the same as conventional drilling tools and does not require detailed maintenance.

[0018] Second, it has strong applicability. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool has a smooth surface streamlined and same-diameter design both inside and outside. It can fully adapt to the construction environment of 100 liters / second large displacement and 110 rpm high speed. It also has stronger anti-erosion and anti-vibration capabilities, which reduces the operating cost of the tool, reduces the maintenance frequency, increases the tool life, saves spare parts consumption, and can adapt to the construction of any well section of a project, and can adapt to the leakage well condition of drilling and plugging at the same time and the underbalanced drilling well condition, greatly improving drilling efficiency.

[0019] Third, the transmission rate is high, with the maximum transmission rate reaching 6.25bps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 Schematic diagram of the front half-section structure of embodiments one to seven of the present invention.

[0021] Attachment Figure 2 Schematic diagram of the top cross-sectional structure of the nested body in embodiments one to seven of the present invention.

[0022] Attachment Figure 3 Schematic diagram of the circuit structure of the device of embodiments 1 to 7 of the present invention.

[0023] Attachment Figure 4 Schematic diagram of the circuit structure of the sensor module in Embodiments 1 to 7 of the present invention.

[0024] Attachment Figure 5 Schematic diagram of the circuit structure of the driving module in embodiments 1 to 7 of the present invention.

[0025] Attachment Figure 6 Schematic diagram of the battery module structure in Examples 1 to 7 of the present invention.

[0026] The codes in the accompanying drawings are: 1 is the drill collar body, 2 is the nested body, 3 is the first groove, 4 is the second groove, 5 is the insulating antenna, 6 is the transition step surface, 7 is the limit step surface, 8 is the insulating layer, 9 is the connecting tube, 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 supporting ring platform, 15 is the first threading hole, 16 is the second threading hole, 17 is the third threading hole, 18 is the fourth threading hole, 19 is the first shock-absorbing spring, 20 is the second shock-absorbing spring, and 21 is the shock-absorbing pad. DETAILED DESCRIPTION

[0027] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0028] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0029] The present invention will be further described below in conjunction with the embodiments and accompanying drawings: Example 1: As shown in the attached Figure 1 、 2 As shown in Figure 3, the drill collar type electromagnetic wave transmission wireless downhole measurement tool includes a drill collar body 1, a nested body 2, a battery module and a measurement circuit module 11. The inner side of the upper part of the drill collar body 1 is provided with a nested body 2 with a hollow structure. The outer side of the middle part of the nested body 2 is provided with a plurality of first grooves 3 spaced along the circumference. A battery module is installed in each first groove 3. 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 of the first grooves 3. The drive module and the sensor module are provided in the second groove 4. 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, and sends them to the ground after modulation and encoding.

[0030] According to the requirements, the materials of the drill collar body 1 and the nested body 2 are both non-magnetic materials, and the first groove 3 can be an arc with an opening facing outward, so that it can match the existing known cylindrical batteries. The number of first grooves 3 can be 10, and the cross-section of the second groove 4 can be rectangular, which is convenient for installing the measurement circuit module 11. The nested body 2 adopts a Gatling ballistic design, and the outer side of the nested body 2 is a conical surface with a larger upper part and a smaller lower part, and the taper is 1 to 4°. In this embodiment, the taper can be 3 degrees, that is, the angle between the outer side surface of the nested body 2 and the vertical surface is 1.5 degrees, which makes it convenient for the nested body 2 to be inserted into the drill collar body 1. When in use, it is connected to the drill tool on the inner side of the upper part of the drill collar body 1. After installation, the nested body 2 and the drill collar shell can be sealed and pressure-bearing, realizing the drill collar type electromagnetic wave transmission wireless downhole measurement tool that can not only circulate drilling fluid internally but also be directly interconnected with other conventional drilling tools.

[0031] When the 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 tool), the sensor module can collect measurements of major parameters such as well inclination, azimuth, tool face angle, etc., realizing measurement while drilling. The drive module encodes the measurement data and transmits it to the ground receiving end in the form of electromagnetic waves. The ground receiving end picks up the signal and performs filtering, collection and other processing, and then transmits it to the data processing software at high speed for data decoding, recovery and display functions. It can be applied to the tracking measurement of wellbore trajectories and geological information of vertical wells, directional wells, horizontal wells and other wells in drilling development, and performs real-time and accurate measurement of the drilling trajectory and fine control of the trajectory to achieve precise drilling.

[0032] 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. It does not require other measurement systems to first connect and tighten the measuring short sections, measure angle differences, hoist, install at the wellhead, and key the seats. This can save at least one hour of time. At the same time, transportation and flushing are the same as conventional drilling tools, and no detailed maintenance is required.

[0033] 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: Example 2: As an optimization of the above example, as shown in the attached Figure 1 As shown, it also includes an insulating antenna 5 with a tubular structure, a limiting step surface 7 is provided on the upper part of the insulating antenna 5, an external connecting thread is provided on the outer side of the insulating antenna 5 corresponding to the position above the limiting step surface 7, the surface of the limiting step surface 7, the surface of the external connecting thread and the upper end of the insulating antenna 5 are all provided with an insulating layer 8, and an internal connecting thread matching the external connecting thread is provided on the inner side of the lower part of the drill collar body 1. The outer side of the upper part of the insulating antenna 5 is screwed to the inner side of the lower part of the drill collar body 1, and the driving module receives the measurement parameters transmitted by the sensor module, and sends them to the ground through the insulating antenna 5 after modulating and encoding them.

[0034] According to the requirements, the lower end of the drill collar body 1 is screwed with a connecting tube 9, the outer side of the upper part of the connecting tube 9 is screwed to the inner side of the lower part of the drill collar body 1, and the inner side of the lower part of the connecting tube 9 is provided with a transition step surface 6. The inner side of the lower part of the connecting tube 9 corresponding to the position below the transition step surface 6 is provided with a transition internal thread matching the external connection thread. The surface of the transition step surface 6, the surface of the transition internal thread, the lower end of the connecting tube 9, the surface of the limit step surface 7, the surface of the external connection thread and the upper end of the insulating antenna 5 are all provided with an insulating layer 8. The insulating layer 8 is an existing Known technologies, such as non-metallic formation sprayed on the surface of the transition step surface 6, the surface of the transition internal thread, the lower end of the connecting tube 9, the surface of the limit step surface 7, the surface of the external connection thread and the upper end of the insulating antenna 5, the non-metal is an existing known technology, such as ceramics, the outer side of the upper part of the insulating antenna 5 is screwed to the inner side of the lower part of the connecting tube 9, and female screw buckles are used at the upper and lower ends of the drill collar body 1. The lower end of the drill collar body 1 and the upper end of the connecting tube 9, and the lower end of the connecting tube 9 and the upper end of the insulating antenna 5 are all in contact with the step surface and the end face coaxial sealing surface.

[0035] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 4 As shown, the sensor module includes a sampling 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 processing submodule includes a filtering processing 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 processing circuit and the A / D conversion circuit sequentially filter and perform A / D conversion on the sensor component data. The core processing unit obtains measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

[0036] The X, Y, and Z accelerometers can all be dual-axis ADXL series micromachined accelerometers with a measurement range of ±2.5g and a low-power single power supply. These three accelerometers can be arranged in a pairwise orthogonal three-dimensional coordinate system, responding to the Earth's gravity field with three-coordinate component vectors.

[0037] The X magnetic sensor, Y magnetic sensor and Z magnetic sensor can all be single-axis MEMS sensors with a measurement range of 2 guss and a low-power single power supply. The three sensors are orthogonal to each other and are in the same coordinate system as the accelerometer, responding to the three-coordinate component vectors of the Earth's magnetic field.

[0038] The above-mentioned sampling processing submodule includes a filtering processing circuit, an A / D conversion circuit, a core processing unit and a serial communication unit, wherein the filtering processing circuit can be a low-pass filter, the low-pass cutoff frequency can be 30Hz, and the gain can be amplified by 5 times; the A / D conversion circuit can be a 12-bit high-precision 8-channel analog-to-digital sampling conversion circuit; the core processing unit can be a low-power embedded CPU, which performs secondary filtering on the six received sensor components and calculates the corresponding engineering values ​​of well inclination, azimuth, tool face angle and other measurement parameters. The calculation process here is an existing well-known technology; the serial communication unit transmits the measurement parameters to the drive module based on TTL communication.

[0039] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 5 As shown, the driving module includes a digital modulation circuit, a communication main control circuit and a vibration detection circuit; The vibration detection circuit detects the static state and motion state of the nested body 2, and transmits the detection data to the communication main control circuit in the form of digital level signals; The communication main 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 sends it to the ground in the form of electromagnetic waves through the insulating antenna 5.

[0040] The above-mentioned vibration detection circuit 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 stillness and movement of an object in a dynamic environment, the comparator and the monostable circuit are used to capture the static and moving states of the nested body 2, and the digital level signal is output to the communication main control circuit.

[0041] The aforementioned communication control circuit includes an RS485 module, a TTL module, and an embedded low-power CPU. The embedded low-power CPU is connected to the RS485 module and the TTL module, respectively, providing multiple communication methods such as logic level, TTL, and RS485. The aforementioned digital modulation circuit, which includes an embedded low-power CPU and MOS transistors, uses PWM modulation technology to modulate and encode received data. This design enables a miniaturized integrated circuit board and further allows for automatic closed-loop control by sampling the output data. The modulated and encoded data is directly fed to the two poles of the insulating antenna 5 and transmitted to the ground in the form of electromagnetic waves.

[0042] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown in , 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 single cells and a battery protection module, the eight single cells and the battery protection module are connected in series in sequence, and the power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

[0043] Each of the above-mentioned battery packs 10 includes eight single cells and a battery protection module; the single cells can be disposable single lithium batteries of 18170 specifications. The battery pack 10 is plastically made into a cylindrical single cell with a diameter of 20mm and a length of 1.2m. The total voltage reaches 29V and the battery capacity is 10AH; the battery protection module is an existing well-known technology and can realize anti-reverse charging protection, overcurrent protection, etc.

[0044] The above-mentioned power conversion circuit includes an EMI filtering sub-module and a DC / DC sub-module, which respectively implement EMI filtering and DC / DC conversion technology. The conversion efficiency can reach more than 80%, the temperature fluctuation is no more than 50mV, and multi-channel power conversion of high and low voltage DC±15V and DC±5V is realized.

[0045] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown, sealing ring platforms 12 are fixed to the outer sides of the upper and lower parts of the nested body 2, at least one sealing ring 13 is arranged between the sealing ring platform 12 and the drill collar body 1 at upper and lower intervals, and a supporting ring platform 14 is fixed to the inner side of the lower part of the drill collar body 1 and contacts the lower end of the sealing ring platform 12 below.

[0046] The first groove 3 and the second groove 4 are arranged on the outside of the nested body 2 between the two sealing ring platforms 12. In order to facilitate the connection between the driving module and the insulating antenna 5, a radially penetrating first threading hole 15 is provided on the outer side of the lower part 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 threading hole 16, the upper end of which is connected to the first threading hole 15. A sealing plugging wire is sealed and fixed on the inner side of the outer side of the first threading hole 15, which facilitates the processing of the first threading hole 15 and the connection between the driving module and the insulating antenna 5. The lower end of the connecting tube 9 is provided with a third threading hole 17 that passes through from top to bottom and is connected to the second threading hole 16. The limiting step surface 7 of the insulating antenna 5 is provided with a fourth threading hole 18 that is connected to the third threading hole 17. The inner side of the lower part of the second threading hole 16 and the inner side of the upper part of the third threading hole 17 and the inner side of the lower part of the third threading hole 17 are connected. The side and the inner side of the upper part of the fourth threading hole 18 are sealed with existing well-known sealing joints, such as single-core spring-type sealing wires or single-core spring-type mechanical seals. The sealing joint can seal the lower end of the second threading hole 16 with the upper end of the third threading hole 17, the lower end of the third threading hole 17 and the upper end of the fourth threading hole 18. The lower end of the connecting wire passes through the second threading hole 16, the upper sealing joint, the third threading hole 17, the lower sealing joint and the fourth threading hole 18 in sequence and is connected to the insulating antenna 5. The upper end of the connecting wire passes through the first threading hole 15 and is connected to the digital modulation circuit. The sealing joint can realize the isolation of the connecting wire and the insulating layer 8 and the feed connection. The two sealing ring platforms 12 are provided, and a double-track radial sealing ring 13 is provided 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.

[0047] Example 7: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a first shock-absorbing spring 19 is provided between the upper and lower sides of each battery module and the inner wall of the first groove 3, a second shock-absorbing spring 20 is provided between the upper and lower sides of the measuring circuit module 11 and the inner wall of the second groove 4, and at least one shock-absorbing pad 21 is provided between the measuring circuit module 11 and the battery module in the adjacent position and between two adjacent battery modules.

[0048] According to requirements, a circuit board is provided in the second groove 4, and the measuring circuit module 11 is installed on the circuit board. The shock-absorbing pad 21 is arranged between the circuit board and the battery module in the adjacent position and between the two adjacent battery modules. A first shock-absorbing spring 19 is arranged in the first groove 3, and a second shock-absorbing spring 20 is arranged in the second groove 4 to achieve an axial shock-absorbing effect. The upper end of the first shock-absorbing spring 19 and the upper end of the second shock-absorbing spring 20 can also contact the lower end of the upper sealing ring platform 12, and the lower end of the first shock-absorbing spring 19 and the lower end of the 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 a lateral shock-absorbing effect, which can reduce the impact of the vibration of the tool on the battery module and the measuring circuit module 11 during use. The length of the drill collar type electromagnetic wave transmission wireless downhole measurement tool is not more than 2m.

[0049] Compared with the current measurement while drilling system, this application has the following advantages: First, the operation is simple and efficient. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool is an integrated design, integrating multiple functions into a drill collar drill tool. It can be docked or disassembled on site like conventional drilling tools. It does not require other measurement systems to first connect and tighten the various measuring short sections, measure angle differences, lift, install at the wellhead, and key the seats. This can save at least one hour of time. At the same time, in terms of transportation and flushing, it is the same as conventional drilling tools and does not require detailed maintenance.

[0050] Second, it has strong applicability. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool has a smooth surface streamlined and same-diameter design both inside and outside. It can fully adapt to the construction environment of 100 liters / second large displacement and 110 rpm high speed. It also has stronger anti-erosion and anti-vibration capabilities, which reduces the operating cost of the tool, reduces the maintenance frequency, increases the tool life, saves spare parts consumption, and can adapt to the construction of any well section of a project, and can adapt to the leakage well condition of drilling and plugging at the same time and the underbalanced drilling well condition, greatly improving drilling efficiency.

[0051] Third, the transmission rate is high, with the maximum transmission rate reaching 6.25bps.

[0052] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0053] The method of using the best embodiment of the drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool of the present invention is as follows: Step 1: The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool is installed on the drilling tool, and then lowered into the well and moves along with the drilling tool; Step 2: The X accelerometer, the Y accelerometer, and the Z accelerometer collect the three-coordinate component vectors of the earth's gravity field; Step 3: The X magnetic sensor, the Y magnetic sensor, and the Z magnetic sensor collect the three-coordinate component vectors of the earth's magnetic field; Step 4: The filtering circuit and the A / D conversion circuit sequentially filter and perform A / D conversion on the three-coordinate component vector data of the earth's gravity field and the three-coordinate component vector data of the earth's magnetic field; Step 5: The core processing unit performs secondary filtering based on the processed data, and then calculates the corresponding measurement parameters such as well inclination, azimuth, and tool face angle; Step 6: The vibration detection circuit detects the static state and the motion state of the nested body 2; Step 7: The measured parameters such as the well inclination angle, azimuth angle, and tool face angle in step 5 are transmitted to the digital modulation circuit through the serial communication unit and the communication main control circuit, and the static state and motion state of the nested body 2 in step 6 are output to the digital modulation circuit through the communication main control circuit as digital level signals; Step 8: The digital modulation circuit uses PWM modulation technology to modulate and encode the received data, and sends it to the ground in the form of electromagnetic waves through the insulating antenna 5; Step nine: After receiving the information, the ground equipment filters, decodes and displays it to obtain downhole data during the drilling process.

[0054] This method can be applied to environments with large displacement, high rotation speed, strong erosion, high sand content, etc., where drilling with anti-deflection drilling is fully used in vertical well sections. It can complete the measurement of major parameters such as well inclination, azimuth, tool face angle, etc., and realize measurement while drilling. The measured data is encoded and transmitted to the ground receiving end in the form of electromagnetic waves through the antenna. The ground receiving end equipment picks up the signal and performs filtering, collection and other processing, and then transmits it to the data processing software at high speed for data decoding, recovery and display functions. It can be applied to the tracking measurement of wellbore trajectories and geological information of vertical wells, directional wells, horizontal wells and other wells in drilling development, and performs real-time and accurate 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 It includes a drill collar body, a nested body, a battery module and a measuring circuit module. A hollow nested body is mounted on the inner side of the upper part of the drill collar body. Several first grooves are distributed along the circumference on the outer side of the middle part of the nested body. A battery module is installed in each first groove. The measuring circuit module includes a driving 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 driving module and the sensor module are provided in the second groove. The battery module supplies power to the driving module and the sensor module. The driving module receives the measurement parameters transmitted by the sensor module, and sends them to the ground after modulation and encoding.

2. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 1, characterized in that It also includes an insulating antenna with a tubular structure, a limiting step surface is provided on the upper part of the insulating antenna, an external connecting thread is provided on the outer side of the insulating 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 insulating 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 insulating antenna is screwed to the inner side of the lower part of the drill collar body, and the driving module receives the measurement parameters transmitted by the sensor module, and sends them to the ground via the insulating antenna after modulating and encoding them.

3. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 2, characterized in that The sensor module includes a sampling 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 processing submodule includes a filtering processing 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 processing circuit and the A / D conversion circuit sequentially filter and perform A / D conversion on the sensor component data. The core processing unit obtains measurement parameters based on the processed sensor component data and transmits them to the driver module through the serial communication unit.

4. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 3, characterized in that The driving module includes a digital modulation circuit, a communication main control circuit and a vibration detection circuit; The vibration detection circuit detects the static state and motion state of the nested body and transmits the detection data to the communication main control circuit in the form of digital level signals; The communication main 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 sends it to the ground in the form of electromagnetic waves through an insulating antenna.

5. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 1, 2, 3 or 4, 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 single cells and a battery protection module. The eight single cells and the battery protection module are connected in series in sequence. The power conversion circuit includes an EMI filter submodule and a DC / DC submodule.

6. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 1, 2, 3 or 4, characterized in that Sealing ring platforms are fixed on the outer sides of the upper and lower parts of the nested body. At least one sealing ring is arranged between the sealing ring platform and the drill collar body. A supporting ring platform in contact with the lower end of the sealing ring platform below is fixed on the inner side of the lower part of the drill collar body.

7. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 5, characterized in that Sealing ring platforms are fixed on the outer sides of the upper and lower parts of the nested body. At least one sealing ring is arranged between the sealing ring platform and the drill collar body. A supporting ring platform in contact with the lower end of the sealing ring platform below is fixed on the inner side of the lower part of the drill collar body.

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

9. The drill collar type electromagnetic wave transmission wireless measurement while drilling downhole tool according to claim 6, characterized in that A first shock-absorbing spring is provided between the upper and lower sides of each battery module and the inner wall of the first groove, a second shock-absorbing spring is provided between the upper and lower sides of the measurement circuit module and the inner wall of the second groove, and at least one shock-absorbing pad is provided between the measurement circuit module and the battery module in the adjacent position, and between two adjacent battery modules.

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