Eccentric generator and underground self-generating system

Abstract

The invention provides an eccentric generator and an underground self-generating system, and relates to the technical field of underground intelligent tools, the device comprises a flow channel pipe, an eccentric channel is arranged in the flow channel pipe, and an annular space is arranged between the inner wall and the outer wall of the eccentric channel; the rotating assembly is arranged in the eccentric channel and comprises a flow guide head, a rotor, a rotation starting device and a shaft rod which are sequentially arranged, the flow guide head is coaxially connected with the shaft rod, the rotor is attached to the inner wall, and the rotation starting device is arranged between the flow guide head and the shaft rod; the stator is arranged in the annular space and used for being matched with the rotor to generate induction current; the supporting flow divider is provided with at least two bypass flow channels, the inner side of the supporting flow divider is connected with the shaft rod through a centering bearing, and the outer side of the supporting flow divider is connected with the inner wall of the eccentric channel; the system comprises the device, a voltage stabilizing and rectifying module and a rechargeable battery assembly, can utilize fluid power to autonomously generate electricity underground, and solves the problems of underground power supply and data transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole intelligent tools, and more particularly to an eccentric generator and a downhole self-power generation system. Background Art

[0002] Currently, in the field of development and application of oilfield intelligent tools, there are mainly two mainstream technologies: cabled technology and cableless technology.

[0003] Among them, cabled technology relies on a sturdy cable as the medium for information transmission. It can accurately transmit various data carefully collected by downhole electronic water distribution / production controllers to the ground. On the ground, these data are analyzed and processed by professional software, and then the ground control system issues precise instructions based on the processing results to adjust various key data downhole, ensuring the efficiency and accuracy of operations. In contrast, cableless technology cleverly utilizes the interaction between the ground and downhole pulse generators to generate a series of pulse coding signals. These pulse signals are captured by carefully designed analysis devices on the ground or downhole and then converted into actual water injection / production data or control instructions, achieving efficient information interaction under cableless conditions.

[0004] In the above two technologies, the power supply methods of downhole equipment are mainly divided into two categories: wired cable power supply and downhole battery power supply. Among them, wired cable power supply faces many challenges in actual operation. For example, the process of lowering the cable is extremely complex and usually requires the use of a special winch for operation, which not only increases the operation cost but also poses a risk of knocking and damaging the cable and the line. In addition, when the cable works in the long-term downhole high-temperature and high-pressure environment, its distributed parameters are likely to change, which often leads to data transmission distortion and command release failure. At the same time, the connection links between the cable and various downhole electrical components also face problems of unreliable sealing and contact, which undoubtedly further exacerbates the instability of data communication.

[0005] On the other hand, although intelligent tools powered by downhole batteries have advantages such as compact structure and easy installation, the battery capacity is limited, and the working time of the instrument is strictly limited by the battery capacity. After one-time consumption, it cannot perform real-time monitoring downhole for a long time. In addition, as the well depth increases, the bottom hole temperature also rises continuously, which poses extremely high requirements for the high-temperature resistance performance of the battery. Ordinary batteries often cannot meet this requirement, and it is necessary to stop production frequently to replace the battery, which not only increases additional cost consumption but may also have an adverse impact on the production progress.

[0006] Therefore, there is an urgent need for an eccentric generator and a downhole self-power generation system to solve the above problems in power supply and data transmission. Summary of the Invention

[0007] The object of the present invention is to provide an eccentric generator and a downhole self - power generation system, which utilize fluid power to generate electricity autonomously downhole, thus completely getting rid of the dependence on communication cables and disposable batteries. This not only helps to simplify the structure of the real - time online measurement and adjustment system, reduce the operation cost, but also can significantly improve the reliability and stability of the system, injecting new vitality into the development of oilfield intelligent tools. The preferred technical solutions among the many technical solutions provided by the present invention and the many technical effects they can produce are described in detail below.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An eccentric generator provided by the present invention includes:

[0010] A flow channel pipe, with an eccentric channel arranged inside, and an annular space is arranged between the inner wall and the outer wall of the eccentric channel;

[0011] A rotating assembly, arranged in the eccentric channel, including a flow - guiding head, a rotor, a swirl inducer and a shaft rod arranged in sequence. The flow - guiding head is coaxially connected with the shaft rod, the rotor is arranged in contact with the inner wall, and the swirl inducer is arranged between the flow - guiding head and the shaft rod;

[0012] A stator, arranged in the annular space, for cooperating with the rotor to generate induced current;

[0013] A support shunt, with at least two bypass channels arranged. The inner side of the support shunt is connected to the shaft rod through a centralizing bearing, and the outer side is connected to the inner wall of the eccentric channel.

[0014] Preferably, the flow - guiding head adopts a spindle - shaped structure.

[0015] Preferably, the support shunt includes an annular main body, a through - hole is arranged at the center of the annular main body, the bypass channels are symmetrically arranged on the annular main body, and bearing mounting positions for installing the centralizing bearings are respectively arranged at both ends of the annular main body.

[0016] Preferably, the swirl inducer adopts an axial - to - circumferential spiral guiding structure, with a guiding angle of 30° - 60°, and the equivalent cross - sectional area of the guiding curve channel of the swirl inducer remains unchanged.

[0017] Preferably, the guiding angle is 45°.

[0018] Preferably, ceramic or cemented carbide layers are arranged on the surface of the flow - guiding head and the surface of the swirl inducer.

[0019] Preferably, the rotor includes an annular main body and a permanent magnet embedded in the annular main body, and the permanent magnet adopts a samarium - cobalt magnet with a temperature resistance exceeding 250°C.

[0020] An underground self - power generation system includes the above - mentioned eccentric generator, a voltage - stabilizing rectification module, and a rechargeable battery assembly. The eccentric generator is connected to the rechargeable battery assembly through the voltage - stabilizing rectification module.

[0021] Preferably, the voltage - stabilizing rectification module stabilizes and rectifies the electric energy generated by the eccentric generator based on a full - bridge rectifier circuit and an LDO linear voltage regulator.

[0022] Preferably, the rechargeable battery assembly includes a battery pack and a battery management system connected to the battery pack.

[0023] The eccentric generator provided by the present invention includes a flow channel pipe, a rotating assembly, a stator, and a support diverter. By setting an eccentric channel in the flow channel pipe, fluid can be injected into the eccentric channel from the main channel or converge from the eccentric channel into the main channel. By scientifically converting the fluid energy in the well, it is possible to get rid of the power supply limitations of cables and disposable batteries. The rotating assembly includes a guide head, a rotor, a swirl generator, and a shaft rod arranged in sequence. The guide head adopts a drag - reducing spindle - shaped structure, which can minimize the flow resistance of the introduced fluid, thereby improving the energy utilization rate. The rotor is arranged in contact with the inner wall of the eccentric channel. The stator is arranged in the annular space between the inner wall and the outer wall of the eccentric channel for cooperating with the rotor to generate induced current to supply power to downhole electrical appliances. The swirl generator is arranged between the guide head and the shaft rod to convert the axial flow of the fluid into a circumferential flow, maximizing the utilization of fluid energy and ensuring the efficient rotation of the system. The support diverter ensures the straightening of the shaft rod, provides reliable structural support and sufficient flow channels, and can generate electricity autonomously underground using fluid power, solving the problems of underground power supply and data transmission.

[0024] The underground self - power generation system provided by the present invention includes the above - mentioned eccentric generator, a voltage - stabilizing rectification module, and a rechargeable battery assembly. Among them, the eccentric generator adopts a drag - reducing spindle - shaped rotating structure to drive a magnetic rotor, cut the magnetic induction lines with the outer - wall coil to generate electricity, and transmit the electric energy to the voltage - stabilizing rectification module. The voltage - stabilizing rectification module stabilizes and rectifies the electric energy generated by the eccentric generator based on a full - bridge rectifier circuit and an LDO linear voltage regulator. The current modulated by the voltage - stabilizing rectification module is transmitted to the rechargeable battery assembly. The rechargeable battery assembly includes a high - temperature - resistant battery pack and a battery management system electrically connected to the high - temperature - resistant battery pack to ensure stable charging and discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of an embodiment of the eccentric generator of the present invention;

[0027] Figure 2 is Figure 1 a schematic structural diagram during use;

[0028] Figure 3 is a schematic structural diagram of the rotating assembly in the eccentric generator of the present invention;

[0029] Figure 4 is a schematic cross-sectional view at the support diverter in the eccentric generator of the present invention;

[0030] Figure 5 is a schematic structural diagram of an embodiment of the downhole self-power generation system of the present invention;

[0031] Figure 6 is a schematic diagram of the multiple combinations of water injection in the downhole self-power generation system of the present invention;

[0032] Figure 7 is a schematic diagram of the multiple combinations of oil production in the downhole self-power generation system of the present invention.

[0033] In the figure: 1, flow channel pipe; 10, eccentric channel; 11, main flow channel; 101, inner wall; 102, outer wall; 103, annular space; 2, rotating assembly; 21, guide head; 22, rotor; 23, spin inducer; 24, shaft rod; 3, stator; 4, support diverter; 40, bypass flow channel; 41, annular body; 410, through hole; 5, centralizing bearing; 6, confluence chamber; 7, water injection nozzle; 8, oil production nozzle; 100, eccentric generator; 200, voltage stabilization and rectification module; 300, rechargeable battery assembly. Specific Embodiments

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention fall within the scope protected by the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Figure 1 is a schematic structural diagram of this embodiment, Figure 2 is Figure 1 a schematic structural diagram during use, as Figure 1 and Figure 2 shown, this embodiment provides an eccentric generator, which includes a flow channel pipe 1, a rotating assembly 2, a stator 3, and a support diverter 4.

[0038] Among them, an eccentric channel 10 is provided inside the flow channel pipe 1. By providing the eccentric channel 10 inside the flow channel pipe 1, the fluid can be injected into the eccentric channel 10 from the main flow channel 11 or converge from the eccentric channel 10 into the main flow channel 11. By scientifically converting the fluid energy in the well, the power supply limitations of cables and disposable batteries can be overcome.

[0039] In this embodiment, an annular space 103 is provided between the inner wall 101 and the outer wall 102 of the eccentric channel 10, and the annular space 103 provides an internal accommodation space for the stator coil. During use, the stator 3 is arranged inside the annular space 103. And the rotating assembly 2 and the support diverter 4 are both arranged inside the eccentric channel 10, and the eccentric channel 10 provides necessary structural connections for the support diverter 4.

[0040] Specifically, Figure 3 is a schematic structural diagram of the rotating assembly in this embodiment, as Figure 3 shown, the rotating assembly 2 in this embodiment includes a flow guiding head 21, a rotor 22, a spin starter 23, and a shaft rod 24 arranged in sequence, and the flow guiding head 21, the rotor 22, the spin starter 23, and the shaft rod 24 are rigidly connected.

[0041] Among them, the flow guide head 21 is coaxially connected to the shaft rod 24. The flow guide head 21 in this embodiment adopts a spindle-shaped structure. By adopting the drag-reducing spindle-shaped structure for the flow guide head 21, the flow resistance of the introduced fluid can be minimized, thereby improving the energy utilization rate. One end of the shaft rod 24 is coaxially connected to the swirl generator 23, and the other end is connected to the centralizing bearing 5 inside the support diverter 4 through a keyway to ensure the stability of the swirl generator.

[0042] The rotor 22 is arranged in contact with the inner wall 101 of the eccentric channel 10, and includes an annular main body and a permanent magnet embedded in the annular main body. The permanent magnet in this embodiment adopts a samarium-cobalt magnet with a temperature resistance exceeding 250°C.

[0043] By arranging the swirl generator 23 between the flow guide head 21 and the shaft rod 24, it is used to convert the axial flow of the fluid into a circumferential flow, maximize the utilization of the fluid energy, and ensure the efficient rotation of the system.

[0044] The stator coil in this embodiment is wound with enameled wire and undergoes micro-nano insulation treatment, with a temperature resistance rating exceeding 220°C. By arranging the stator 3 in the annular space 103, it is used to cooperate with the rotor 22 to generate an induced current to supply power to downhole electrical appliances.

[0045] It can be understood that the number of winding turns and the magnetic field strength of the magnet in this embodiment are matched according to the planned output voltage to ensure that the output voltage is within the required range of the backend circuit.

[0046] Figure 4 is a cross-sectional schematic diagram of the support diverter in this embodiment, as Figure 4 shown, the support diverter 4 is provided with at least two bypass channels 40. The inner side of the support diverter 4 is connected to the shaft rod 24 through the centralizing bearing 5, and the outer side is connected to the inner wall 101 of the eccentric channel 10.

[0047] Specifically, the support diverter 4 in this embodiment includes an annular main body 41. A through hole 410 is provided at the center of the annular main body 41. Bypass channels 40 are symmetrically opened on the annular main body 41. Bearing mounting positions for mounting the centralizing bearing 5 are respectively provided at both ends of the annular main body 41. By respectively installing the centralizing bearing 5 at both ends of the support diverter 4, it is used to provide reliable structural support and sufficient flow channels.

[0048] The centralizing bearing 5 in this embodiment is installed together with the shaft rod 24 and the support diverter 4 through a keyway. Specifically, the shaft rod 24 is fixed to the inner ring of the centralizing bearing 5 through a keyway, and the support diverter 4 is fixed to the outer ring of the centralizing bearing 5 through a keyway to ensure the centralization of the shaft rod 24, and the shaft rod can drive the entire eccentric generator to run smoothly in the flow channel.

[0049] As an alternative embodiment, the swirler 23 in this embodiment adopts an axial-to-circumferential spiral guiding structure with a guiding angle of 30° - 60°, preferably 45°. Moreover, the equivalent cross-sectional area of the flow guiding curve channel of the swirler 23 remains unchanged to ensure smooth fluid flow without throttling.

[0050] As an alternative embodiment, ceramic or cemented carbide layers are provided on the surface of the flow guiding head 21 and the surface of the swirler 23 in this embodiment.

[0051] Specifically, the flow guiding head 21 and the swirler 23 in this embodiment adopt ceramic or cemented carbide spraying for erosion-resistant surface treatment, such as spraying tungsten carbide, to improve the stability and safety during use.

[0052] Optionally, the flow guiding head 21, the swirler 23, the shaft rod 24, the support diverter 4, the centralizing bearing 5, and the flow channel pipe 1 in this embodiment are all made of high-strength corrosion-resistant stainless steel material, such as 718 stainless steel.

[0053] Figure 5 is a schematic structural diagram of the downhole self-power generation system in this embodiment, as Figure 5 shown, this embodiment also provides a downhole self-power generation system, including the above-mentioned eccentric generator 100, voltage stabilization and rectification module 200, and rechargeable battery assembly 300. The eccentric generator 100 is connected to the rechargeable battery assembly 300 through the voltage stabilization and rectification module 200. The eccentric generator 100 in this embodiment adopts a drag-reducing spindle-shaped rotating structure to drive the magnetic rotor to cut the magnetic induction lines with the outer wall coil to generate electricity, and transmits the electric energy to the voltage stabilization and rectification module 200. The voltage stabilization and rectification module 200 stabilizes and rectifies the electric energy generated by the eccentric generator 100 based on a full-bridge rectifier circuit and an LDO linear voltage regulator, and the current modulated by the voltage stabilization and rectification module 200 is transmitted to the rechargeable battery assembly 300. The rechargeable battery assembly 300 includes a high-temperature resistant battery pack and a battery management system electrically connected to the high-temperature resistant battery pack to ensure stable charging and discharging.

[0054] Specifically, the voltage stabilization and rectification module 200 uses a full-bridge rectifier circuit to modulate the current, uses high-temperature resistant capacitance and resistance devices and diodes, and preferably silicon carbide diodes for the diodes; uses an LDO linear voltage regulator with a high temperature resistance of 200 °C, and is equipped with a ceramic capacitor and a metal film resistor to form a filter circuit to ensure stable voltage output.

[0055] The rechargeable battery assembly 300 uses a high-temperature resistant battery pack, preferably a lithium iron phosphate battery pack; the battery management system has overcharge, over-discharge, and short-circuit protection functions, and the circuit uses a high-temperature resistant PCB substrate (polyimide) and gold wire bonding process, and the rechargeable battery system can continuously supply power to the electrical appliance.

[0056] Taking water injection as an example, as Figure 2As shown, the eccentric generator 100 is installed in the eccentric channel 10. When the water injection in the main flow channel 11 enters the eccentric channel 10, the fluid enters the eccentric generator 100. The fluid is introduced into the swirl generator 23 in a streamlined manner through the guide head 21. The flow direction of the fluid changes from axial to circumferential, driving the entire rotating assembly 2 to rotate. The rotor 22 generates a rotating magnetic field, causing an induced current in the stator coil and continuously supplying power to the downhole electrical appliances. The fluid passes through the bypass flow channels 40 on both sides of the support diverter 4 and continues to flow.

[0057] As Figure 6 and Figure 7 shown, this downhole self - power generation system can be reused multiple times. Please refer to Figure 6 . When injecting water, the fluid is injected from the main flow channel 11 into the eccentric channel 10, passes through 2 downhole self - power generation systems, converges into the confluence bin 6, and then is discharged through the water injection nozzle 7.

[0058] When producing oil, please refer to Figure 7 shown. According to the requirements of the flow direction, the fluid enters the confluence bin 6 from the oil production nozzle 8 and finally converges from the eccentric channels 10 of the 2 downhole self - power generation systems into the main flow channel 11.

[0059] As described above, this is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. An eccentric generator, characterized in that, Comprising: A flow channel pipe with an eccentric channel provided inside, and an annular space provided between the inner wall and the outer wall of the eccentric channel; A rotating assembly disposed in the eccentric channel, including a flow guiding head, a rotor, a swirl generator, and a shaft rod arranged in sequence. The flow guiding head is coaxially connected to the shaft rod, the rotor is attached to the inner wall, and the swirl generator is disposed between the flow guiding head and the shaft rod; A stator disposed in the annular space for cooperating with the rotor to generate an induced current; A support diverter with at least two bypass flow channels. The inner side of the support diverter is connected to the shaft rod through a centering bearing, and the outer side is connected to the inner wall of the eccentric channel.

2. The eccentric generator according to claim 1, characterized in that: The flow guiding head adopts a spindle-shaped structure.

3. An eccentric generator according to claim 1 or 2, characterized in that: The support diverter includes an annular main body with a through hole provided at the center. The bypass flow channels are symmetrically opened on the annular main body, and bearing mounting positions for mounting the centering bearings are respectively provided at both ends of the annular main body.

4. An eccentric generator according to claim 1 or 2, characterized in that: The swirl generator adopts an axial-to-circumferential spiral guiding structure with a guiding angle of 30° - 60°, and the equivalent cross-sectional area of the flow guiding curve channel of the swirl generator remains unchanged.

5. An eccentric generator according to claim 4, wherein: The guiding angle is 45°.

6. An eccentric generator according to claim 1 or 2, characterized in that: Ceramic or cemented carbide layers are provided on the surface of the flow guiding head and the surface of the swirl generator.

7. An eccentric generator according to claim 1 or 2, characterized in that: The rotor includes an annular main body and a permanent magnet embedded in the annular main body. The permanent magnet adopts a samarium cobalt magnet with a temperature resistance exceeding 250°C.

8. An underground self-power generation system, characterized in that: Comprising the eccentric generator according to any one of claims 1 - 7, a voltage stabilizing and rectifying module, and a rechargeable battery assembly. The eccentric generator is connected to the rechargeable battery assembly through the voltage stabilizing and rectifying module.

9. The downhole self-power generation system according to claim 8, characterized in that, The voltage stabilizing and rectifying module stabilizes and rectifies the electric energy generated by the eccentric generator based on a full-bridge rectifier circuit and an LDO linear voltage regulator.

10. The downhole self-power generation system according to claim 9, characterized in that, The rechargeable battery assembly includes a battery pack and a battery management system connected to the battery pack.

Images