Intelligent well flow control valve device based on geothermal energy self-power generation

Abstract

The invention discloses an intelligent well flow control valve device based on geothermal energy self-power generation. The intelligent well flow control valve device is mainly composed of a geothermal power generation module assembly, an energy storage device and a flow valve body device assembly. The thermoelectric module is driven by the underground geothermal temperature difference to generate power, and the stored electric energy is used for controlling the throttling hole of the valve body. Flow regulation is controlled from axial displacement and circumferential rotation angle: in the axial direction, a motor drives a lead screw-sleeve mechanism, rotation motion is converted into axial displacement of an inner sliding sleeve, and the axial opening degree of throttling holes of the inner sliding sleeve and the outer sliding sleeve is changed; the inner sliding sleeve is driven to rotate in the circumferential direction through a gear-rack mechanism, and the circumferential opening degree of the throttling hole is adjusted. The Hall sensing device assembly monitors displacement and rotation angle parameters in real time, and closed-loop control is formed. Two-degree-of-freedom precise regulation and control of the underground flow valve are achieved through geothermal self-power supply, the problem of energy loss existing in traditional hydraulic control is solved, and the energy efficiency ratio and regulation and control precision of crude oil extraction are remarkably improved.

Description

Technical Field

[0001] The object of the present invention is to control the flow rate of fluid flowing into the production tubing by electronically controlling the specific area in the valve body. More specifically, the present invention relates to an intelligent well flow control valve device based on geothermal energy self-generation for selectively controlling the opening degree of the throttle orifice of the valve body. Background Art

[0002] In today's world, oil resources are facing shortages and increasing extraction difficulties, and traditional conventional oil and gas well production technologies can no longer meet the current demand for oil. At a depth of several thousand meters underground, changing the displacement of the sliding sleeve by traditional hydraulic control methods is affected by the huge resistance of the pressure fluid, which will affect the overall control effect of the sliding sleeve.

[0003] The power supply for conventional electronically controlled intelligent well flow control valves is cable power transmission. Since the working depth of intelligent completion flow control valves is generally 3 kilometers underground, there are problems such as transmission loss and maintenance cost, or they are powered by ordinary batteries, but the battery life cannot achieve long-term control underground.

[0004] In view of the deficiencies of the hydraulic control method for intelligent well flow control valves, electronically controlled intelligent well flow control valves have been designed, that is, by supplying power to the motor through a power supply device to drive the sliding sleeve to move, which can effectively reduce the influence of the resistance of the pressure fluid. Chinese Patent CN105805332A discloses "an underground flow stepless adjustment electric control valve", which converts electrical energy into the rotational motion of the drive shaft through a hollow motor, and then converts the rotation into the axial displacement of the inner tube through a screw pair, and finally realizes the stepless adjustment of the flow rate by changing the opening area of the liquid inlet. Chinese Patent CN102383761A discloses "an underground flow control valve based on fiber Bragg grating sensing detection", which sends signals through a computer control system, supplies electrical energy through a cable to drive the motor system to drive the sliding sleeve valve to adjust the flow rate, and the displacement of the sliding sleeve is detected by a fiber Bragg grating detection system.

[0005] To solve such problems and reduce the exploitation and maintenance costs of oil and gas wells, therefore, the present invention proposes a design that combines the utilization of underground resources for power generation and self-circulation and an electric drive sliding sleeve to optimize such products. Through geothermal self-power supply, the double-degree-of-freedom precise control of the underground flow valve is realized, the energy loss problem existing in traditional hydraulic control is solved, and the energy efficiency ratio and control accuracy of crude oil exploitation are significantly improved to solve the problems mentioned above. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide an intelligent well flow control valve device based on geothermal energy self-generation.

[0007] The present invention is realized through the following technical solutions:

[0008] Provided is an intelligent well flow control valve device based on geothermal energy self-generation, including a geothermal power generation module assembly, an energy storage device, and a flow valve body device assembly connected in sequence from top to bottom;

[0009] Further, the geothermal power generation module assembly realizes downhole temperature difference power generation based on the working principles of the Seebeck effect and the Peltier effect, and includes an inner ring heat conduction cylinder, an outer ring heat conduction cylinder, a cold storage temperature difference power generation liquid cylinder, an inner ring thermoelectric power generation ring, an inner ring thermoelectric refrigeration ring, an outer ring thermoelectric power generation ring, and an outer ring thermoelectric refrigeration ring. The heat source absorbs the heat from the crude oil around the production tubing wall and the heat around the geothermal resources in the geothermal well, and the cold source establishes a thermoelectric cycle through the refrigeration effect of the cold storage temperature difference power generation liquid cylinder;

[0010] Further, the flow valve body device assembly includes a lead screw - sleeve mechanism. The inner sliding sleeve contacts the driven sleeve and axially moves under the action of thrust to adjust the axial opening degree between the inner hole of the inner sliding sleeve and the outer hole of the outer sliding sleeve; a ring-shaped rack is provided on the outer wall of the inner sliding sleeve and meshes with a gear driven by a motor inside the driven sleeve, and the inner sliding sleeve is driven to rotate circumferentially through the gear - rack mechanism to adjust the circumferential rotation opening degree between the inner hole of the inner sliding sleeve and the outer hole of the outer sliding sleeve. The outer sliding sleeve is provided with a pin hole and is axially fixed to the Hall sensing device assembly.

[0011] Further, the lead screw - sleeve mechanism includes a motor, a planetary gear reducer, a coupling, a bearing seat, a bearing, a lead screw, and a sleeve. The motor is fixedly installed in the annular cavity in the front half of the valve body. The planetary gear reducer is coaxially connected to the motor to increase the torque output. The coupling connects the output shaft of the planetary gear reducer and the input shaft of the lead screw. The lead screw is fixed through a bearing fitted with a bearing seat, and the external thread of the lead screw cooperates with the internal thread of the inner hole of the sleeve to realize the conversion of the rotational motion of the lead screw into the axial displacement of the sleeve.

[0012] Further, the gear - rack mechanism includes a motor, a coupling, a transmission shaft, a spur gear, and a ring-shaped rack. The motor is fixedly installed in the inner hole of the driven sleeve. The coupling connects the output shaft of the motor and the input shaft of the transmission shaft. The spur gear is axially fixed on the transmission shaft, and the ring-shaped rack meshes with the spur gear to drive the inner sliding sleeve to rotate and adjust the circumferential opening degree of the throttle hole.

[0013] Further, the Hall sensing device assembly is axially fixed to the inner wall of the outer sliding sleeve and is used to receive sensor signals and detect the axial displacement and rotational angle of the inner sliding sleeve.

[0014] The advantages and beneficial effects of the present invention are:

[0015] Compared with the traditional flow control valve device, the present invention utilizes the downhole geothermal temperature difference to drive the geothermal power generation module assembly to generate electricity, and stores the electric energy for controlling the opening degrees of the inner and outer holes of the flow valve body device assembly. The flow regulation is realized by controlling the axial displacement and circumferential rotation angle: axially, the motor drives the lead screw-sleeve mechanism to convert the rotational motion of the lead screw into the axial displacement of the inner sliding sleeve, changing the axial opening degree of the inner and outer holes; circumferentially, the gear-rack mechanism drives the inner sliding sleeve to rotate to adjust the circumferential opening degree of the throttle hole. The annular Hall sensing device monitors the displacement and rotation angle parameters in real time to form a closed-loop control. The present invention realizes the precise regulation of the downhole flow valve with two degrees of freedom through geothermal self-power supply, aiming to solve the disadvantages brought by the traditional hydraulic control and the problems such as the exploitation and maintenance costs of oil and gas wells in the above-mentioned background technology, and aims to improve the energy efficiency ratio and regulation accuracy of crude oil exploitation. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 General schematic diagram of the completion system constructed for the present invention;

[0018] Figure 2 Cross-sectional structure schematic diagram of the geothermal self-power generation module assembly of the present invention;

[0019] Figure 3 General cross-sectional structure schematic diagram of the present invention;

[0020] Figure 4a Cross-sectional structure schematic diagram of the lead screw-sleeve mechanism of the flow valve body device assembly of the present invention;

[0021] Figure 4b Cross-sectional structure schematic diagram when the axial opening degree of the flow valve body device assembly is fully closed Figure Ⅰ ;

[0022] Figure 4c Cross-sectional structure schematic diagram when the axial opening degrees of the flow valve body device assembly partially overlap Figure Ⅱ ;

[0023] Figure 4d Cross-sectional structure schematic diagram when the axial opening degree of the flow valve body device assembly is fully open Figure Ⅲ ;

[0024] Figure 5a Cross-sectional structure sectional view of the gear-rack mechanism of the flow valve body device assembly of the present invention;

[0025] Figure 5b Isometric view of the gear-rack mechanism driven by the motor of the present invention;

[0026] Figure 5c Schematic cross-sectional view B-B of the flow valve body device assembly with the circumferential opening fully closed;

[0027] Figure 5d Schematic cross-sectional view C-C of the flow valve body device assembly with the circumferential opening partially overlapping;

[0028] Figure 5e Schematic cross-sectional view D-D of the flow valve body device assembly with the circumferential opening fully open;

[0029] Figure 6 Perspective view of the two-degree-of-freedom regulation of the inner and outer holes at the bottom of the flow valve body device assembly;

[0030] Figure 7a Schematic diagram of magnetic induction lines when the ring magnet and the ring Hall sensing device are in induction;

[0031] Figure 7b Arrangement diagram of the magnetization directions between the magnets on the ring magnet;

[0032] Figure 7c Schematic cross-sectional view E-E of the ring Hall sensing device;

[0033] Figure 8 General control principle flow chart of the present invention.

[0034] Wherein: Figure 1 As shown, 101, oil well, 102, control system, 103, casing, 104, production tubing, 105, geothermal power generation module assembly, 106, energy storage device, 107, flow valve body device assembly, 108, connection component, 109, packer, 110, production perforation;

[0035] Figure 2 As shown, 201, outer ring heat conduction cylinder, 202, outer ring thermoelectric refrigeration ring, 203, outer ring thermoelectric 0 power generation ring, 204, inner ring heat conduction cylinder, 205, inner ring thermoelectric power generation ring, 206, inner ring thermoelectric refrigeration ring, 207, cold storage and thermoelectric power generation liquid cylinder;

[0036] Figure 3 As shown, 311, upper valve body, 1061, ring battery block;

[0037] Figure 4aAs shown, 312, front step; 313, outer sliding sleeve; 314, micro motor; 315, planetary gear reducer; 316, coupling; 317, bearing seat washer; 318, bearing seat; 319, lead screw; 320, driven sleeve; 321, bolt and nut; 322, rolling bearing; 323, annular Hall sensing device; 324, inner sliding sleeve; 325, inner hole; 326, outer hole; 327, annular magnet; 328, linear bearing; 329, guide rod; 330, shaft snap ring; 331, self-lubricating gasket; 332, O-ring seal; 333, annular external rack; 334, opposite side flange; 335, pin; 336, internal thread; 337, external thread; 343, upper joint; 344, lower joint;

[0038] Figure 5a As shown, 438, micro motor; 439, set screw; 440, coupling; 441, spur gear; 442, transmission shaft;

[0039] As shown in FIGS. 7, 7a, and 7b, 500, (imaginary) magnetic induction line; 501, quick-release cartridge; 502, fixture base; 503, controller chip assembly; 504, filter; 505, temperature sensor; 506, Hall linear displacement sensor; 507, Hall angle sensor; 508, sensor board; 509, support frame; 510, umbilical cable; 511, magnet; 512, outer ring of annular magnet; 513, inner ring of annular magnet. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0041] Embodiment

[0042] The present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0043] As Figure 1As shown in the figure, this embodiment is the intelligent well flow control valve device based on geothermal energy self-generation. The oil well 101 is provided with a control system 102 for monitoring and regulating the production of the oil well 101; a casing 103 is lowered into the oil well 101 to provide support for the wellbore, and a production tubing 104 is placed inside the casing 103 to form a fluid transportation channel; a geothermal power generation module assembly 105 is installed on the production tubing 104. The geothermal power generation module assembly 105 uses geothermal energy to generate electricity and is equipped with an energy storage device 106. The energy storage device 106 cooperates with the geothermal power generation module assembly 105 to store excess electric energy to ensure power supply. A flow valve body device assembly 107 is also provided on the production tubing 104. The flow valve body device assembly 107 is used to adjust the flow rate and pressure of the fluid in the pipe to maintain the stability of the production process; a connection assembly 108 is used to connect each section of the downhole well pipe, and a packer 109 is used to separate different layers to prevent cross-layer interference, so that the formation fluid at the production perforation 110 can flow into the production tubing 104 to realize oil and gas exploitation and transportation.

[0044] As Figure 2 shown, the geothermal power generation module assembly includes an inner ring heat conduction cylinder 204, an outer ring heat conduction cylinder 201, a cold storage thermoelectric generation liquid cylinder 207, an inner ring thermoelectric power generation ring 205, an inner ring thermoelectric refrigeration ring 206, an outer ring thermoelectric power generation ring 203, and an outer ring thermoelectric refrigeration ring 202. The heat source absorbs the heat of the crude oil around the production tubing wall and the heat around the geothermal resources in the geothermal well. The cold source establishes a thermoelectric cycle through the refrigeration effect of the cold storage thermoelectric generation liquid cylinder;

[0045] Further, the outer ring heat conduction cylinder 201 absorbs the heat of the geothermal resources in the geothermal well; the inner ring heat conduction cylinder 204 is installed on the outer wall of the production tubing 104 to absorb the waste heat around the tubing outer wall; combining the Seebeck effect and the Peltier effect, the outer ring of the outer ring thermoelectric power generation ring 203 and the inner ring of the inner ring thermoelectric power generation ring 205 absorb heat as the hot end of the thermoelectric power generation; the inner ring of the outer ring thermoelectric refrigeration ring 202 and the outer ring of the inner ring thermoelectric refrigeration ring 206 absorb the refrigeration capacity of the cold storage thermoelectric generation liquid cylinder 207 as the cold end of the thermoelectric power generation.

[0046] Further, the electric energy generated by the outer ring thermoelectric power generation ring 203 and the inner ring thermoelectric power generation ring 205 combined with the cold storage thermoelectric generation liquid cylinder 207 is used to supply the outer ring thermoelectric refrigeration ring 202 and the inner ring thermoelectric refrigeration ring 206 to continuously generate cold energy; the cold storage thermoelectric generation liquid cylinder 207 can continuously refrigerate to supply the outer ring thermoelectric power generation ring 203 and the inner ring thermoelectric power generation ring 205 to generate electric energy and maintain the temperature difference between the hot end and the cold end; the geothermal power generation module assembly 105 can realize self-circulation power generation through the temperature difference between the hot end and the cold end.

[0047] Furthermore, the areas of the outer thermoelectric power generation ring 203 and the inner thermoelectric power generation ring 205 must be larger than those of the outer thermoelectric refrigeration ring 202 and the inner thermoelectric refrigeration ring 206; ensure that the power generation energy is greater than the refrigeration energy during this self-circulation process, and achieve sustainable self-circulation power generation.

[0048] As Figure 3 shown, the geothermal power generation module assembly 105, the energy storage device 106, and the flow valve body device assembly 107 are coaxially connected. The lower end of the upper valve body 311 is connected to the geothermal power generation module assembly 105, and a ring-shaped energy storage block 1061 is fixedly installed in the energy storage device 106;

[0049] As Figure 4a shown, in this embodiment, the 343 upper joint is connected to the energy storage device 106. The front step 312 is connected to the outer sliding sleeve 313 to form an annular cavity. A micro motor 314 is fixedly installed in this annular cavity. The planetary gear reducer 315 is coaxially connected to the micro motor 314. One side of the coupling 316 is connected to the output shaft of the planetary gear reducer 315, and the input shaft of the lead screw 319 is connected to the other side of the coupling 316. The bearing seat washer 317 is fixed to the inner wall of the outer sliding sleeve 313 by screws. The bearing seat 318 is fixedly connected to the platform of the bearing seat washer 317. The lead screw 319 is coaxial with the bearing seat, and both ends of the lead screw 319 are fixed to avoid shearing as much as possible during the working process; the front step 312 fixedly installs an opposite flange 334. One end of the guide rod 329 is installed in the opposite flange 335, and the guide rod support 328 fixes the other end of the guide rod 329; the inner sliding sleeve 324 is sleeved on the production tubing 104 to form an oil hole sealing groove with the front step 312. The annular external gear rack 333 is fixed to the front end of the inner sliding sleeve 324 through a keyway. The annular magnet 327 is embedded in a groove designed on the inner sliding sleeve 324; the lead screw 319 passes through the round hole of the driven sleeve 320; the internal thread 336 in the round hole cooperates with the external thread 337 of the lead screw to convert the rotational motion of the lead screw into the axial motion of the driven sleeve; the two left and right driven sleeves 320 are fixedly connected by bolts and nuts 321. The driven sleeve 320 and the inner sliding sleeve 324 are matched through a rolling bearing 322. The driven sleeve 320 is sleeved on the outer ring of the rolling bearing 322, and the inner sliding sleeve 324 is matched with the inner ring of the rolling bearing 322, so that when the inner sliding sleeve 324 rotates, the driven sleeve 320 does not rotate accordingly; the outer ring of the annular Hall sensing device 323 is fixed to the inner wall of the bottom end of the outer sliding sleeve 313. An external hole 326 is opened at the bottom of the outer sliding sleeve 313, and an internal hole 325 is opened at the bottom of the inner sliding sleeve 324;

[0050] As Figure 4b , 4c, 4d shown, in this specific embodiment, the axial movement of the inner sliding sleeve 324 is realized through a lead screw-sleeve mechanism to adjust the relative axial opening degree of the internal hole 325 and the external hole 326.

[0051] As Figure 5a, as shown in Figure 5b, in this embodiment, the micro motor 438 is fixed in the driven sleeve 320 by a set screw 439. The output shaft of the micro motor 438 is connected to the coupling 440, and the other end of the coupling 440 is coaxially connected to the input shaft of the transmission shaft 442. The end of the transmission shaft 442 penetrates through the through hole on the front step 312, and the spur gear 441 is circumferentially fixed at the shaft shoulder of the transmission shaft 442. The spur gear 441 meshes with the annular external rack 333, causing the inner sliding sleeve 324 fixed to the annular external rack 333 to rotate together;

[0052] Further, when the axis of the driven sleeve 320 moves, the micro motor 438 moves with the driven sleeve 320, and the transmission shaft 442 moves correspondingly in the through diameter. During this process, the annular external rack 333 and the spur gear 441 always remain stationary, and the meshing process is not affected.

[0053] As Figure 5c , as shown in Figures 5d and 5e, after the annular external rack 333 rotates through meshing with the spur gear 441, the inner sliding sleeve 324 rotates. At this time, the inner hole 325 of the inner sliding sleeve 324 and the outer hole 326 of the outer sliding sleeve 313 undergo circumferential offset.

[0054] As Figure 6 shown, when the inner sliding sleeve 324 axially moves through the lead screw - sleeve mechanism and also circumferentially rotates through the gear - rack mechanism, at this time, both the axial opening and the rotational opening of the inner hole 325 and the outer hole 326 change, realizing the two - degree - of - freedom regulation of the inner and outer holes at the bottom of the flow valve body device assembly.

[0055] As Figure 7a shown, a groove on the inner sliding sleeve 324 embeds the annular magnet 327, and the annular magnet 327 generates a magnetic field shown by the magnetic induction lines 500; the outer ring of the annular Hall sensing device 323 is fixed to the inner wall of the bottom end of the outer sliding sleeve 313, and the inner ring of the annular Hall sensing device 323 does not contact the inner sliding sleeve 324, forming a cavity area for the axial movement or circumferential rotation of the inner sliding sleeve 324 to be separated from the annular Hall sensing device 323;

[0056] As Figure 7bAs shown in the figure, the fixture base 501 is fixedly installed on the inner wall of the outer sliding sleeve 313. The quick-release cartridge 501 can be installed on the fixture base 502 through a buckle. Inside the quick-release cartridge 501 is a sensor board 508, which is fixedly supported by a support frame 509. The support frame 509 is stable inside the quick-release cartridge 501. On the sensor board 508, there are a controller chip assembly 503, a filter 504, and a temperature sensor 505. The controller chip assembly 503 cooperates with the filter 504 to process signals, and the temperature sensor 505 is used to monitor the temperature. The Hall linear displacement sensor 506 and the Hall angle sensor 507 are arranged under the sensor board 508, and are respectively used to detect the displacement distance after the inner sliding sleeve 324 axially moves through the lead screw-sleeve mechanism and the rotation angle after circumferentially rotating through the gear-rack mechanism. The umbilical cable 510 is connected to the circuit output end of the sensor board 508 to achieve signal interaction and achieve precise monitoring and control of relevant parameters.

[0057] As Figure 7c shown, an exemplary Halbach array ring magnet 327 composed of multiple magnets 511. The ring magnet 327 is composed of 24 magnets, with 8 magnets in each group. Their magnetization directions are all different, and there are three groups in total. According to this arrangement of magnetization directions, the magnetic induction line intensity of the outer ring 512 of the ring magnet can be made stronger, and the magnetic induction line intensity of the inner ring 513 of the ring magnet can be almost negligible. When the Hall linear displacement sensor 506 and the Hall angle sensor 507 sense the magnetic field of the outer ring 512 of the ring magnet, they can better receive the magnetic field signal and provide more accurate data feedback.

[0058] As Figure 8 shown, this is a specific embodiment of an intelligent well flow control valve device based on geothermal energy self-generation in the present technical solution. The working process of the present invention will be briefly described in combination with the overall control principle flow chart:

[0059] The whole process of underground flow control is automatically controlled by a control module. The geothermal power generation module assembly 105 generates electricity, supplies power to the energy storage device 106, and transmits it to the flow valve body device assembly 107. The electric energy is used for the micro-motor 413 and the micro-motor 438. The micro-motor 314 drives the inner sliding sleeve 324 to axially move, and the micro-motor 438 drives the inner sliding sleeve 324 to circumferentially rotate, adjusting the relative opening degree of the inner hole 325 and the outer hole 326 of the flow control valve. The ring Hall sensing device 323 is used to detect the axial displacement and rotation angle of the inner sliding sleeve 324 during the movement process, obtaining the parameters of the relative opening degree of the inner hole 325 and the outer hole 326. The temperature sensor 505 is used to detect the underground working environment temperature, achieving the purpose of optimizing the oil production technical solution, increasing the oil and gas production, and the recovery rate.

[0060] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "front end", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. This is 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. Therefore, it should not be construed as a limitation to the present invention.

[0062] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An intelligent well flow control valve device based on geothermal energy self-generation, characterized in that, It includes a geothermal power generation module assembly, an energy storage device, and a flow valve body device assembly that are connected in sequence from top to bottom.

2. The intelligent well flow control valve device based on geothermal energy self-power generation according to claim 1, wherein, The geothermal power generation module assembly realizes downhole thermoelectric power generation based on the working principles of the Seebeck effect and the Peltier effect. It includes an inner ring heat conduction cylinder, an outer ring heat conduction cylinder, a cold storage thermoelectric power generation liquid cylinder, an inner ring thermoelectric power generation ring, an inner ring thermoelectric refrigeration ring, an outer ring thermoelectric power generation ring, and an outer ring thermoelectric refrigeration ring. The heat source absorbs the heat from the crude oil around the production tubing wall and the heat around the geothermal resources in the geothermal well. The cold source establishes a thermoelectric cycle through the refrigeration effect of the cold storage thermoelectric power generation liquid cylinder.

3. The intelligent well flow control valve device based on geothermal energy self-generation according to claim 1, wherein the flow valve body device assembly includes a lead screw-sleeve mechanism. The inner sliding sleeve contacts the driven sleeve and axially moves under the action of thrust to adjust the axial opening degree between the inner hole of the inner sliding sleeve and the outer hole of the outer sliding sleeve. An annular rack is provided on the outer wall of the inner sliding sleeve and meshes with a gear driven by a motor inside the driven sleeve. The inner sliding sleeve is driven to rotate circumferentially through a gear-rack mechanism to adjust the circumferential rotation opening degree between the inner hole of the inner sliding sleeve and the outer hole of the outer sliding sleeve. The outer sliding sleeve is provided with a pin hole and is axially fixed to the Hall sensing device assembly.

4. The lead screw - sleeve mechanism according to claim 3, characterized in that, It includes a motor, a planetary gear reduction box, a coupling, a bearing seat, a bearing, a lead screw, and a sleeve. The motor is fixedly installed in the annular cavity at the front half of the valve body. The planetary gear reduction box is coaxially connected to the motor to increase the torque output. The coupling connects the output shaft of the planetary gear reduction box and the input shaft of the lead screw. The lead screw is fixed through a bearing fitted with a bearing seat. The external thread of the lead screw cooperates with the internal thread of the inner hole of the sleeve to realize the conversion of the rotational motion of the lead screw into the axial displacement of the sleeve.

5. The gear-rack mechanism according to claim 3, wherein, It includes a motor, a coupling, a transmission shaft, a spur gear, and an annular rack. The motor is fixedly installed in the inner hole of the driven sleeve. The coupling connects the output shaft of the motor and the input shaft of the transmission shaft. The spur gear is axially fixed on the transmission shaft. The annular rack meshes with the spur gear to drive the inner sliding sleeve to rotate and adjust the circumferential opening degree of the throttle hole.

6. The intelligent well flow control valve device based on geothermal energy self-power generation according to claim 3, characterized in that, The Hall sensing device assembly is axially fixed on the inner wall of the outer sliding sleeve and is used to receive sensor signals and detect the axial displacement and rotational angle of the inner sliding sleeve.

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