Inner rotor power generation device for supplying power to near-bit wireless measurement-while-drilling system

Abstract

The invention provides an inner rotor power generation device for supplying power to a near-bit wireless measurement-while-drilling system, the inner rotor power generation device is installed in a non-magnetic short section and comprises a stator coil, a magnetic steel group and an inner blade turbine, turbine blades of the inner blade turbine are internally arranged, the magnetic steel group is arranged on the outer circle of the inner blade turbine, and slurry scours the turbine blades of the inner blade turbine to drive the magnetic steel group to rotate. The generated magnetic field cuts a winding of a stator coil to generate three-phase alternating current, and conversion from kinetic energy to electric energy is achieved. Turbine blades of the inner blade turbine are internally arranged, a magnetic steel array is arranged on the outer circle of a rotor, a slurry flow channel is formed in the turbine, the turbine blades are arranged on the side wall of an inner hole, slurry is adopted for power generation, lithium battery consumption is omitted, and environmental pollution is reduced; and by adopting the form that the mud power generation important composition module is mounted on the inner wall of the non-magnetic drill collar, the influence on mud circulation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling engineering, in particular to an inner rotor power generation device used for powering a near-drill bit wireless measurement while drilling system. Background Art

[0002] The near-bit geosteering system is an important drilling tool for directional wells, branch wells, large-displacement horizontal wells and other complex wells. The power supply system of wireless measurement while drilling instruments in the oil drilling industry is generally powered by lithium batteries. With the widespread application of geosteering technology, logging while drilling technology and wireless electromagnetic wave short-distance drilling technology in the process of oil field development, the complex underground measurement and control system must have sufficient power supply as a guarantee, but lithium batteries have many disadvantages, including limited charge storage and operating temperature range; poor safety and reliability; environmental pollution; and high cost of the battery itself.

[0003] The structure of the current common mud generator consists of an impeller, a rotor, a stator, a drive shaft, a transmission, a generator control circuit, and a generator housing. The transmission system adopts a mechanical hard connection structure. The principle is that the mud fluid drives the impeller to rotate, and the drive shaft drives the motor rotor to rotate through the transmission deceleration, cutting the magnetic lines to generate electricity. However, it has the following disadvantages: the various components of the generator are mainly installed in the annulus of the non-magnetic drill collar, which changes the important drilling parameters such as the mud flow rate and the bottom hole pressure difference in the mud circulation system, affecting the drilling construction progress and trajectory control effect.

[0004] Therefore, the present invention provides an inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system. The device is installed inside a non-magnetic short section (1) and comprises a stator coil (4), a magnetic steel group (8), and an inner blade turbine (9). The turbine blades of the inner blade turbine (9) are internally arranged, and the magnetic steel group (8) is arranged on the outer circle. Mud flushes the turbine blades of the inner blade turbine (9) to drive the magnetic steel group (8) to rotate, and the generated magnetic field cuts the winding of the stator coil (4) to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy.

[0006] According to one embodiment of the present invention, the device comprises: a magnetic yoke (10) which is fixedly connected to the inner blade turbine (9) and rotates inside the non-magnetic drill collar as the mud flows.

[0007] According to one embodiment of the present invention, a plurality of mounting grooves are arranged on the side wall of the non-magnetic short section (1), and a control circuit and a data platform (3) are arranged in the mounting grooves. After rectifying and stabilizing the three-phase alternating current, the control circuit and the data platform (3) can continuously output stable direct current to provide a high-power power supply for the downhole instrument system near the drill bit.

[0008] According to one embodiment of the present invention, the control circuit and the data platform (3) are installed and fixed by means of the sheath (2), and the positioning screw passes through the outer wall of the sheath (2), and the end thereof extends into the interior of the control circuit and the data platform (3).

[0009] According to one embodiment of the present invention, the device comprises a plurality of sealing pins (5) uniformly arranged in the circumferential direction of the non-magnetic short section (1), which serve as sealing accessories between the stator winding (4) and the control circuit and data platform (3), and simultaneously assume the functions of circuit control and energy transmission.

[0010] According to one embodiment of the present invention, the device comprises an inner bearing fixedly connected to the magnetic steel group (8) and an outer bearing fixedly connected to the non-magnetic short section (1).

[0011] According to one embodiment of the present invention, the device comprises a retaining ring (13) for limiting the entire inner rotor power generation device and preventing it from moving outwards.

[0012] According to one embodiment of the present invention, the device comprises a high-power bidirectional protection circuit, which is used to prevent the voltage output from exceeding a limit value due to the mud flow causing the speed of the inner blade turbine (9) to exceed a predetermined value, thereby effectively protecting the subsequent circuit.

[0013] According to another aspect of the present invention, there is also provided an inner rotor power generation method for powering a near-bit wireless measurement while drilling system, which is performed by a device as described in any one of the above items, and the method comprises:

[0014] The turbine blades of the inner blade turbine (9) are flushed by mud to drive the magnetic steel group (8) to rotate, and the generated magnetic field cuts the winding of the stator coil (4) to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy;

[0015] The three-phase alternating current is rectified and stabilized by the control circuit and the data platform (3), and then a stable direct current is continuously output to provide a high-power power supply for the downhole instrument system near the drill bit.

[0016] According to another aspect of the present invention, a storage medium is provided, which contains a series of instructions for executing the method steps described above.

[0017] The present invention provides an inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system. The turbine blades of the inner blade turbine are built-in, a magnetic steel array is arranged on the outer circle of the rotor, the mud flow channel is inside the turbine, and the turbine blades are arranged on the side wall of the inner hole. The mud is used to generate electricity, which saves the consumption of lithium batteries and reduces environmental pollution; the mechanical structure is more optimized, the magnetic steel group is installed on the side wall of the non-magnetic drill collar, and the drill collar wall is used as a mounting bracket for the stator coil package to form a static sealing structure; the inner blade turbine is directly integrated with the magnetic steel group, and non-powered transmission is adopted to reduce the sealing structure. The important component module of mud power generation is installed on the inner wall of the non-magnetic drill collar, which reduces the impact on the mud circulation.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A cross-sectional view of the internal structure of an inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to an embodiment of the present invention is shown;

[0021] Figure 2 An internal cross-sectional view of an inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to an embodiment of the present invention is shown;

[0022] Figure 3 A high-power bidirectional protection circuit diagram according to an embodiment of the present invention is shown.

[0023] In the accompanying drawings, the same reference numerals are used for the same components. In addition, the accompanying drawings are not drawn according to the actual scale.

[0024] The meanings of the various figure marks in the accompanying drawings are as follows: 1-non-magnetic short section, 2-sheath, 3-control circuit and data platform, 4-statator winding package, 5-sealing pin, 6-first inner bearing, 7-first outer bearing, 8-magnetic steel group, 9-inner blade turbine, 10-yoke, 11-second inner bearing, 12-second outer bearing, 13-retaining ring. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0026] The prior art (CN103470433A) provides a downhole mud power generation device, which relates to the technical field of generators, and in particular to a downhole mud power generation device. The power generation device includes a housing, a turbine arranged outside the housing, an external coupling magnet arranged on the turbine, a drive shaft arranged inside the housing, an internal coupling magnet arranged on the drive shaft and corresponding to the position of the external coupling magnet, and a generator coaxially connected to the internal coupling magnet, and the outline of the housing is set to be spindle-shaped. The housing of the power generation device is designed to be spindle-shaped, and no hydraulic oil is used inside, which not only improves the power generation efficiency but also effectively reduces the resistance encountered by the mud when flowing through the housing, allowing the power generation device to operate more smoothly; due to the reduction of resistance, the speed at which the mud flows through the generator housing will also be accelerated, so the pressure caused by the mud on the housing will also be reduced accordingly, thereby improving the stability and reliability of the power generation device in a mud pressure environment.

[0027] The prior art (CN110486211A) provides a downhole high-power turbine generator with a simple structure, reliable performance and high power. It includes a housing device, a turbine rotating device and a power generation device. The inner cavity of the housing device is specifically a power generation device installation cavity. The power generation device specifically includes a rotor shaft and a stator assembly. The region of the rotor shaft corresponding to the stator assembly is annularly arranged with a first magnetic steel structure. The region of the rotor shaft corresponding to the power generation device installation cavity of the turbine rotating device is annularly arranged with a second magnetic steel structure. The outer ring surface of the housing device corresponding to the second magnetic steel structure is sleeved with a turbine rotating device. The inner ring groove of the turbine rotating device is annularly arranged with a third magnetic steel structure.

[0028] The prior art (Design of a Mine-Used Turbine Generator While Drilling, Coal Engineering Vol. 53 No. 9) provides a mine-used turbine generator while drilling design. Aiming at the problem of short battery life of underground drilling instruments in coal mines, a mine-used turbine generator while drilling has been developed by combining turbine power generation technology and the requirements of instruments in underground boreholes. The explosion-proof design of the generator is flameproof and intrinsically safe. The motor drive structure adopts a magnetic coupling connection method. The circuit design realizes the functions of self-shutdown and self-recovery of the battery pack charging, real-time monitoring of the power generation process and battery information, and dual protection of charging and discharging. By building a test platform, the power generation capacity and temperature rise under actual working conditions were simulated and verified. The design method and test results show that the device meets the explosion-proof requirements of mining equipment and the needs of actual working conditions, and can be used as the main power supply system for underground drilling instruments.

[0029] Existing technology (Research and test of downhole high-power power generation technology in measurement while drilling, Petroleum Drilling Technology Vol. 36 No. 5) conducts research and test of downhole high-power power generation technology in measurement while drilling. With the development of measurement while drilling and downhole guidance control technology, the functions of measurement while drilling instruments and control tools are becoming more and more powerful. Batteries, as the mainstream power source downhole, can no longer meet the power demand of measurement while drilling instruments and control tools. Research and analysis found that using high-power generators as downhole power sources is a better way to solve the power supply problem. This paper introduces a downhole high-power turbine generator that can match EM-MWD or other measurement while drilling instruments and control tools. The generator consists of three parts: a generator body, a turbine driver, and a contactless transmission mechanism. When the drilling fluid displacement is greater than 22L / s and the rated output current is 5A, the designed output power is greater than 600W. In the full displacement test, when the displacement is 28L / s, the output power is selected to be 1100W. The test results show that the generator meets the design requirements. According to the data collected in the test, the actual working characteristics of the generator are analyzed.

[0030] However, the various components of the generator in the prior art are mainly installed in the annulus of the non-magnetic drill collar, which changes important drilling parameters such as mud flow rate and bottom hole pressure difference in the mud circulation system, affecting the drilling construction progress and trajectory control effect.

[0031] Figure 1 The figure shows a cross-sectional view of the internal structure of an inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to an embodiment of the present invention.

[0032] An inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system is installed inside a non-magnetic short section 1, comprising a stator coil 4, a magnetic steel group 8, and an inner blade turbine 9, wherein the turbine blades of the inner blade turbine 9 are built-in, and the magnetic steel group 8 is arranged on the outer circle. Mud flushes the turbine blades of the inner blade turbine 9 to drive the magnetic steel group 8 to rotate, and the generated magnetic field cuts the winding of the stator coil 4 to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy.

[0033] The turbine blades of the inner blade turbine 9 of the present invention are built-in, and a magnetic steel group (array) 8 is arranged on the outer circle of the rotor of the inner blade turbine 9. The mud flow channel is inside the inner blade turbine 9, and the turbine blades are arranged on the side wall of the inner hole. The mud is used to generate electricity, which saves the consumption of lithium batteries and reduces environmental pollution. The magnetic steel group 8 is installed on the side wall of the non-magnetic drill collar, and the drill collar wall is used as the mounting bracket of the stator coil 4 to form a static sealing structure, and the mechanical structure is more optimized. The inner blade turbine 9 is directly integrated with the magnetic steel group 8, and non-powered transmission is adopted, which reduces the sealing structure.

[0034] In one embodiment, Figure 1As shown, an inner rotor power generation device for powering a near-bit wireless measurement while drilling system comprises: a magnetic yoke 10, which is fixedly connected to an inner blade turbine 9 and rotates inside a non-magnetic drill collar as mud flows.

[0035] In one embodiment, Figure 2 As shown, the side wall of the non-magnetic short section 1 is provided with a plurality of mounting grooves, in which a control circuit and a data platform 3 are arranged, which can continuously output stable direct current after rectifying and stabilizing the three-phase alternating current to provide a high-power power supply for the downhole instrument system near the drill bit. Figure 2 As shown, two symmetrical installation grooves are arranged on the side wall of the non-magnetic short section 1, and the control circuit and the data platform 3 are arranged in the installation grooves.

[0036] In one embodiment, Figure 2 As shown, an inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system comprises a sheath 2. Specifically, the control circuit and the data platform 3 are installed and fixed through the sheath 2, and the positioning screw passes through the outer wall of the sheath 2, and the end thereof extends into the interior of the control circuit and the data platform 3. Furthermore, the sheath 2 realizes the sealing of the control circuit and the data platform 3 from the air.

[0037] In one embodiment, Figure 1 As shown, an inner rotor power generation device for powering a near-bit wireless measurement while drilling system comprises a plurality of sealing pins 5 evenly arranged in the circumferential direction of a non-magnetic short section 1, which serve as sealing accessories between a stator coil 4 and a control circuit and data platform 3, and simultaneously assume the functions of circuit control and energy transmission. Furthermore, the number of sealing pins 5 is 3.

[0038] In one embodiment, an inner rotor power generation device for powering a near-bit wireless measurement while drilling system comprises an inner bearing fixedly connected to a magnetic steel group 8 and an outer bearing fixedly connected to a non-magnetic short section 1. Specifically, Figure 1 As shown, the inner bearing includes a first inner bearing 6 and a second inner bearing 11, and the outer bearing includes a first outer bearing 7 and a second outer bearing 12, wherein the first inner bearing 6 and the second inner bearing 11 are directly fixed to the magnetic steel group 8, and the first outer bearing 7 and the second outer bearing 12 are directly fixed to the non-magnetic short section 1.

[0039] In one embodiment, Figure 1 As shown, an inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system comprises a retaining ring 13 for limiting the entire inner rotor power generation device to prevent it from moving outward.

[0040] In one embodiment, an inner rotor power generation device for powering a near-bit wireless measurement while drilling system includes a high-power bidirectional protection circuit, which is used to prevent the voltage output from exceeding a limit value due to the rotation speed of the inner blade turbine (9) exceeding a predetermined value due to mud flow, thereby effectively protecting subsequent circuits. Figure 3 As shown, R is a power resistor, and TVS is a bidirectional transient diode. When the generator output voltage is higher than the breakdown voltage of TVS, TVS is in a low resistance state, and the voltage across it is clamped at a fixed value and does not increase with the increase of the generator output voltage, so it can effectively protect the subsequent circuits. Specifically, when the mud flow is too large and the speed of the inner blade turbine 9 exceeds the predetermined value, the voltage control circuit starts to work and realizes the function of controlling the generator output voltage. The voltage across it is clamped at a fixed value and does not increase with the increase of the generator output voltage, so it can effectively protect the subsequent circuits.

[0041] In one embodiment, the inner blade turbine 9 and the magnetic steel group 8 are made of wear-resistant and high-temperature materials and have a long service life.

[0042] According to another aspect of the present invention, there is also provided an inner rotor power generation method for powering a near-bit wireless measurement while drilling system, which is performed by an inner rotor power generation device for powering a near-bit wireless measurement while drilling system. The method comprises: flushing the turbine blades of the inner blade turbine 9 with mud to drive the magnetic steel group 8 to rotate, and the generated magnetic field cuts the winding of the stator coil 4 to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy; rectifying and stabilizing the three-phase alternating current through the control circuit and the data platform 3, and continuously outputting stable direct current to provide a high-power power supply for the near-bit downhole instrument system.

[0043] The sheath 2 seals the control circuit and data platform 3 from the air. When the mud flushes the inner blade turbine 9, it drives the magnetic steel group 8 to rotate, and the magnetic field generated cuts the winding of the stator coil 4 to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy. The generated alternating current can be rectified and stabilized by the control circuit and data platform 3 to continuously output stable direct current to provide high-power power for the downhole instrument system near the drill bit.

[0044] The inner rotor power generation device for powering a near-bit wireless measurement while drilling system provided by the present invention can also be used in conjunction with a computer-readable storage medium, on which a computer program is stored, and the computer program is executed to run an inner rotor power generation method for powering a near-bit wireless measurement while drilling system. The computer program can run computer instructions, which include computer program codes, which can be in source code form, object code form, executable file, or some intermediate form, etc.

[0045] Computer-readable storage media may include: any entity or device that can carry computer program code, recording media, USB flash drives, mobile hard disks, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0046] It should be noted that the content contained in computer-readable storage media can be appropriately increased or decreased based on the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, based on legislation and patent practices, computer-readable storage media do not include electrical carrier signals and telecommunications signals.

[0047] In summary, the present invention provides an inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system. The turbine blades of the inner blade turbine are built-in, a magnetic steel array is arranged on the outer circle of the rotor, the mud flow channel is inside the turbine, and the turbine blades are arranged on the side wall of the inner hole. The mud is used to generate electricity, which saves the consumption of lithium batteries and reduces environmental pollution; the mechanical structure is more optimized, the magnetic steel group is installed on the side wall of the non-magnetic drill collar, and the drill collar wall is used as a mounting bracket for the stator coil package to form a static sealing structure; the inner blade turbine is directly integrated with the magnetic steel group, and non-powered transmission is adopted to reduce the sealing structure. The important component module of mud power generation is installed on the inner wall of the non-magnetic drill collar, which reduces the impact on the mud circulation.

[0048] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0049] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Certain terms are used throughout this application document to indicate specific system components. As those skilled in the art will recognize, different names can usually be used to indicate the same components, so this application document is not intended to distinguish those components that are only different in name but not in function. In this application document, the terms "comprise", "include" and "have" are used in an open form, and therefore should be interpreted as meaning "including but not limited to...". In addition, the terms "substantially", "substantially" or "approximately" that may be used in this article relate to the tolerances of the corresponding terms accepted by the industry. The term "coupling" as may be used in this article includes direct coupling and indirect coupling via other components, elements, circuits, or modules, wherein for indirect coupling, the components, elements, circuits, or modules between them do not change the information of the signal but can adjust its current level, voltage level, and / or power level. Inferred coupling (for example, one of the elements is coupled to another element by inference) includes direct and indirect coupling between two elements in the same way as "coupling".

[0052] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0053] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0054] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. An inner rotor power generation device for powering a near-drill bit wireless measurement while drilling system, characterized in that: The device is installed inside a non-magnetic short section (1), and comprises a stator coil (4), a magnetic steel group (8), and an inner blade turbine (9), wherein the turbine blades of the inner blade turbine (9) are internally arranged, and the magnetic steel group (8) is arranged on the outer circle. Mud washes the turbine blades of the inner blade turbine (9) to drive the magnetic steel group (8) to rotate, and the generated magnetic field cuts the winding of the stator coil (4) to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy.

2. The inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to claim 1, characterized in that: The device comprises: a magnetic yoke (10) which is fixedly connected to an inner blade turbine (9) and rotates inside a non-magnetic drill collar as mud flows.

3. An inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system as claimed in claim 1 or 2, characterized in that: A plurality of mounting grooves are arranged on the side wall of the non-magnetic short section (1), and a control circuit and a data platform (3) are arranged in the mounting grooves. After rectifying and stabilizing the three-phase alternating current, the control circuit and the data platform (3) can continuously output stable direct current to provide a high-power power supply for the downhole instrument system near the drill bit.

4. The inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to claim 3, characterized in that: The control circuit and the data platform (3) are installed and fixed through the sheath (2), and the positioning screw passes through the outer wall of the sheath (2), and the end of the positioning screw extends into the interior of the control circuit and the data platform (3).

5. An inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system as claimed in claim 3 or 4, characterized in that: The device comprises a plurality of sealing pins (5) uniformly arranged in the circumferential direction of the non-magnetic short section (1), which serve as sealing accessories between the stator winding package (4) and the control circuit and data platform (3), and simultaneously assume the functions of circuit control and energy transmission.

6. An inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to any one of claims 1 to 5, characterized in that: The device comprises an inner bearing fixedly connected to a magnetic steel group (8) and an outer bearing fixedly connected to a non-magnetic short section (1).

7. An inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to any one of claims 1 to 6, characterized in that: The device comprises a retaining ring (13) for limiting the entire inner rotor power generation device and preventing it from moving outwards.

8. An inner rotor power generation device for powering a near-drill-bit wireless measurement while drilling system according to any one of claims 1 to 7, characterized in that: The device comprises a high-power bidirectional protection circuit, which is used to prevent the voltage output from exceeding a limit value due to the rotation speed of the inner blade turbine (9) exceeding a predetermined value due to the mud flow, thereby effectively protecting the subsequent circuits.

9. An inner rotor power generation method for powering a near-drill-bit wireless measurement while drilling system, characterized in that: Executed by the apparatus according to any one of claims 1 to 8, the method comprises: The turbine blades of the inner blade turbine (9) are flushed by mud to drive the magnetic steel group (8) to rotate, and the generated magnetic field cuts the winding of the stator coil (4) to generate three-phase alternating current, thereby realizing the conversion of kinetic energy into electrical energy; The three-phase alternating current is rectified and stabilized by the control circuit and the data platform (3), and then a stable direct current is continuously output to provide a high-power power supply for the downhole instrument system near the drill bit.

10. A storage medium, characterized in that: It contains a series of instructions for executing the method steps as claimed in claim 9.

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