Wellhead power generation device

Abstract

The invention belongs to the technical field of oil and gas exploitation equipment, and particularly relates to a wellhead power generation device. The wellhead power generation device comprises a barrel and a power generation assembly. The power generation assembly comprises a power generator, a supporting guide vane and a power generation impeller, when underground fluid flows into the barrel through the wellhead equipment and passes through the power generation assembly, the power generation impeller can decelerate and throttle the underground fluid, and meanwhile, the power generation impeller can rotate under the action of the underground fluid, so that the power generator is driven to rotate to generate power. According to the wellhead power generation device, energy lost due to pressure drop can be converted into electric energy while the yield of an oil and gas well can be adjusted, so that energy waste is reduced, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas production equipment, and in particular relates to a wellhead power generation device. Background Art

[0002] At present, in order to adjust the production of oil and gas wells during oil and gas production, nozzles of different diameters and lengths are usually installed at the wellhead. When the downhole fluid passes through the nozzle, the production of the oil and gas well is adjusted by generating a pressure drop (pressure potential energy drop). Generally speaking, the greater the pressure drop, the smaller the production of the oil and gas well; conversely, the less the pressure drop, the greater the production of the oil and gas well. Pressure potential energy is mainly converted into fluid kinetic energy and internal energy. In fact, as long as there is a pressure potential energy drop, energy loss will occur, resulting in energy waste and failure to achieve effective energy utilization. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a wellhead power generation device.

[0004] The wellhead power generation device according to the present invention comprises:

[0005] The cylinder body is constructed as a cylinder with two ends opened and can be connected to the wellhead equipment through its two ends;

[0006] A power generation assembly, comprising a generator, a support guide vane configured to extend circumferentially from a first portion of the generator and abut against an inner wall of the cylinder, and a power generation impeller configured to extend circumferentially from a second portion of the generator, wherein the power generation assembly is fixedly disposed inside the cylinder through the support guide vane, and the second portion is configured to be movably connected to the first portion;

[0007] Among them, the power generation impeller is constructed to be able to slow down and throttle the downhole fluid when the downhole fluid flows into the cylinder through the wellhead equipment and flows through the power generation component, and can rotate in response to the action of the downhole fluid, thereby driving the second part to rotate to perform power generation operations.

[0008] As an extension of the above technical solution, the present invention also provides the following embodiments:

[0009] The power generation impeller is constructed as an angle-adjustable structure.

[0010] The first part is connected with an adjustable guide vane which is circumferentially extended in all directions and has an adjustable angle.

[0011] The adjustable guide vane is disposed on the first portion at a position between the supporting guide vane and the power generation impeller.

[0012] The generator includes a second part and two first parts respectively located at both ends of the second part.

[0013] The number of support guide vanes located in the same section of the first portion in the axial direction is an odd number.

[0014] The number of the adjustable guide vanes located in the same section of the first portion in the axial direction is an even number.

[0015] The number of the power generation impellers located in the same section in the axial direction of the second part is an even number.

[0016] It comprises a power transmission line, one end of which is connected to the power generation component, and the other end of which passes through the cylinder and is connected to an external line.

[0017] A plurality of power generation components are axially arranged inside the cylinder.

[0018] The advantages of the present invention compared to the prior art are:

[0019] 1. Through the design of the cylinder and power generation components, the process of installing several nozzles of different specifications at the wellhead is eliminated during the production process of oil and gas wells, which improves the convenience of workers' operations;

[0020] 2. Through the design of the cylinder and the power generation assembly, the staff can set the required pressure difference according to the flow rate of the downhole fluid, thereby having a wider range of adjustment for the oil and gas well production than the prior art, and thus making the technical solution according to the present invention more adaptable to complex working conditions;

[0021] 3. Through the design of the cylinder and power generation components, the energy lost by pressure drop is used to generate electricity, thereby reducing energy waste, improving energy utilization, and solving the electricity consumption problem of oil and gas fields at a low cost;

[0022] 4. When the downhole fluid passes through the wellhead power generation device according to the present invention, the flow direction is approximately straight, which largely avoids the energy loss caused by the nozzle diameter change, pipeline bending, etc., and the energy utilization efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a wellhead power generation device according to one embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a wellhead power generation device according to another embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the wellhead power generation device according to the present invention when it is installed on the wellhead equipment.

[0026] All drawings in the present invention are schematic diagrams for illustrating structures and principles, and are not necessarily drawn according to actual sizes and proportions.

[0027] The specific meanings of the reference numerals in the figures are as follows:

[0028] 1. Cylinder; 11. External thread; 12. Internal thread; 2. Wellhead equipment; 21. Oil and gas inlet pipeline; 22. Oil and gas outlet pipeline; 23. Casing blowdown pipeline; 24. Test pipeline; 3. Power generation assembly; 31. Generator; 311. First part; 312. Second part; 32. Support guide vane; 33. Power generation impeller; 34. Adjustable guide vane; 4. Power transmission line; 5. Wellbore; 100. Wellhead power generation device. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0030] First of all, it should be noted that Figure 3 As shown, the wellhead equipment 2 includes an oil and gas inlet pipeline 21, an oil and gas outlet pipeline 22, a casing blowout pipeline 23 and a test pipeline 24, etc. Its main function is to connect with the wellbore 5 so as to guide downhole fluids such as oil and gas out of the wellbore 5.

[0031] Figure 1 FIG. 1 is a schematic diagram of a wellhead power generation device 100 according to an embodiment of the present invention. As shown in the figure, the wellhead power generation device 100 includes a cylinder 1 and a power generation assembly 3. The cylinder 1 is constructed as a cylinder with two ends open, and can be connected to the wellhead power generation device 100 through its two ends. Figure 3 The wellhead equipment 2 shown is connected to facilitate the entry of downhole fluid. The power generation component 3 includes a generator 31, a support guide vane 32 and a power generation impeller 33. The generator 31 includes a first part 311 and a second part 312, and the second part 312 is configured to be movably connected to the first part 311. The support guide vane 32 is configured to extend from the first part 311 in the circumferential direction to all sides and abut against the inner wall of the cylinder 1, so that the power generation component 3 is fixedly arranged inside the cylinder 1. The power generation impeller 33 is configured to extend from the second part 312 in the circumferential direction to all sides, can play a role in slowing down and throttling the downhole fluid flowing therethrough, and can drive the second part 312 to rotate under the action of the downhole fluid flowing therethrough to perform power generation operations.

[0032] During the specific operation, the downhole fluid flows into the barrel 1 through the wellhead equipment 2 and flows through the power generation component 3. Since the power generation impeller 33 is located in the path that the downhole fluid must pass through, the power generation impeller 33 will decelerate and throttle the downhole fluid, thereby playing a role in regulating the production of the oil and gas well. At the same time, the power generation impeller 33 will drive the second part 312 in the generator 31 to rotate under the action of the downhole fluid, so that the wellhead power generation device 100 can perform power generation operations.

[0033] In addition, since the internal structure and power generation principle of the generator 31 are well known to those skilled in the art, the internal structure and power generation principle of the generator 31 will not be described in detail here.

[0034] According to the wellhead power generation device 100 of the present invention, through the arrangement of the cylinder 1 and the power generation component 3, after being connected with the wellhead equipment 2, it is possible to adjust the production of the oil and gas wells while also achieving the technical effect of generating electricity by utilizing the pressure drop of the downhole fluid, thereby being able to meet the demand for electricity of the oil and gas fields at a low cost, reducing energy consumption, improving energy utilization efficiency, and having good economy.

[0035] like Figure 1 As shown, in one embodiment of the present invention, the power generation impeller 33 is constructed as an angle-adjustable structure. Through this design, the staff can set the required pressure difference by adjusting the angle of the power generation impeller 33 according to the flow rate of the downhole fluid, thereby having a wider adjustment range for the oil and gas well production than the prior art, thereby making the technical solution according to the present invention more adaptable to complex working conditions.

[0036] Preferably, the power generation impeller 33 is constructed as an angle-adjustable and center-open structure. This design, on the one hand, facilitates the staff to adjust the power generation impeller 33 to a greater extent. On the other hand, compared with the power generation impeller 33 of a non-center-open structure, the center-open power generation impeller 33 has less resistance to the downhole fluid, thereby helping to reduce energy loss and improve energy utilization. On the other hand, it also facilitates its own installation and disassembly, thereby improving the convenience of operation for the staff.

[0037] like Figure 1As shown, in one embodiment of the present invention, an adjustable guide vane 34 extending in all directions along the circumferential direction and having an adjustable angle is connected to the first part 311. Through the design of the adjustable guide vane 34, the angle of the adjustable guide vane 34 can be adjusted according to the flow rate of the downhole fluid, which has a wider adjustment range for the oil and gas well production than the prior art, thereby making the technical solution according to the present invention more adaptable to complex working conditions. In addition, by adjusting the angle of the adjustable guide vane 34, the flow of the downhole fluid can be sorted out, and the purpose of optimizing the power generation efficiency of the generator 31 can also be achieved.

[0038] Furthermore, if Figure 1 As shown, in one embodiment of the present invention, the adjustable guide vane 34 is arranged on the first part 311 at a position between the support guide vane 32 and the power generation impeller 33, and in specific operation, the downhole fluid flows through the support guide vane 32, the adjustable guide vane 34 and the power generation impeller 33 in sequence. Through this design, the downhole fluid is subjected to the throttling, deceleration and diversion effects of the adjustable guide vane 34 before flowing through the power generation impeller 33, so that the force of the downhole fluid acting on the power generation impeller 33 is more regular, which is conducive to the power generation impeller 33 to better drive the generator 31 to generate electricity.

[0039] like Figure 1 As shown, in one embodiment of the present invention, the generator 31 includes a second part 312 and two first parts 311 respectively located at both ends of the second part 312. In the power generation component 3, the power generation impeller 33 is located in the middle position, the outer side of the power generation impeller 33 is the adjustable guide vane 34, and the outer side of the adjustable guide vane 34 is the support guide vane 32. Through this design, on the one hand, the support guide vanes 32 are provided at both ends of the power generation component 3, so that the power generation component 3 can be more stably fixed inside the cylinder 1. On the other hand, the power generation impeller 33 is set in the middle position, so that the force from the downhole fluid it receives is decelerated, throttled and combed by the adjustable guide vane 34, thereby reducing the disorder of the downhole fluid force, which is conducive to the smooth and smooth power generation operation.

[0040] In one embodiment of the present invention, in order to enhance the stability of the support guide vane 32 in supporting the power generation assembly 3, the support guide vane 32 is configured as a straight guide vane.

[0041] In one embodiment of the present invention, the number of support vanes 32 in the same section in the axial direction of the first portion 311 is an odd number. With this design, the power generation assembly 3 can be fixed inside the cylinder 1 more stably.

[0042] Preferably, in order to securely support the power generation assembly 3 , the number of support guide vanes 32 located in the same section in the axial direction of the first portion 311 is set to 3 by utilizing the principle that the triangle has stability.

[0043] In one embodiment of the present invention, the number of adjustable guide vanes 34 in the same section in the axial direction of the first portion 311 is an even number. With this design, the throttling, deceleration and combing effects of the adjustable guide vanes 34 on the downhole fluid are more uniform, which is conducive to the smooth and stable performance of subsequent power generation operations.

[0044] Preferably, the number of the adjustable guide vanes 34 located in the same section of the first portion 311 in the axial direction is 4 to 16.

[0045] In one embodiment of the present invention, the number of the power generation impellers 33 in the same section in the axial direction of the second portion 312 is an even number. This design makes the power generation impellers 33 more evenly stressed, which is conducive to smooth and stable power generation.

[0046] Preferably, the number of the power generation impellers 33 located in the same section in the axial direction of the second portion 312 is 4 to 16.

[0047] like Figure 2 As shown, in one embodiment of the present invention, the wellhead power generation device 100 includes a power transmission line 4. One end of the power transmission line 4 is connected to the power generation component 3, and the other end passes through the cylinder 1 and is connected to an external line (not shown). Through this design, the electric energy generated by the wellhead power generation device 100 can be transmitted and applied to other electrical equipment.

[0048] Preferably, one end of the power transmission line 4 connected to the power generation component 3 is connected to the support guide vane 32, and the electric energy generated by the generator 31 is transmitted to the external line through the support guide vane 32 and the power transmission line 4.

[0049] like Figure 2 As shown, in one embodiment of the present invention, a plurality of power generation components 3 are axially arranged inside the cylinder 1. Through this design, the wellhead power generation device 100 can obtain a larger range of production regulation functions for downhole fluids and a higher power generation capacity, thereby expanding the applicable scope of the wellhead power generation device 100 according to the present invention.

[0050] Preferably, three power generation components 3 are axially arranged inside the cylinder 1 .

[0051] like Figure 2As shown, in one embodiment of the present invention, an external thread 11 is provided on the outer wall of one end of the cylinder 1, and an internal thread 12 is provided on the inner wall of the other end of the cylinder 1. This design facilitates the firm connection between the wellhead power generation device 100 and the wellhead equipment 2.

[0052] According to the wellhead power generation device 100 of the present invention, through the arrangement of the cylinder 1 and the power generation assembly 3, after being connected to the wellhead equipment 2, on the one hand, it can achieve a wider range of production adjustment of the oil and gas well production compared with the prior art, thereby enhancing its ability to adapt to complex working conditions, and on the other hand, it also achieves the technical effect of generating electricity by using the pressure drop of the downhole fluid. In summary, while achieving a wide range of deceleration and throttling adjustment of the oil and gas well production, it can also meet the demand for electricity in the oil and gas field at a low cost, reduce energy consumption, improve energy utilization efficiency, and have better economy.

[0053] Finally, it should be noted that although the present invention has been described in detail with reference to the preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wellhead power generation device, comprising: The cylinder (1) is constructed as a cylinder with two ends open, and can be connected to the wellhead equipment (2) through its two ends; A power generation assembly (3), comprising a generator (31), a support guide vane (32) configured to extend in all directions from a first portion (311) of the generator (31) and abut against an inner wall of the cylinder (1), and a power generation impeller (33) configured to extend in all directions from a second portion (312) of the generator (31), wherein the power generation assembly (3) is fixedly arranged inside the cylinder (1) via the support guide vane (32), and the second portion (312) is configured to be movably connected to the first portion (311); The power generation impeller (33) is configured to decelerate and throttle the downhole fluid when the downhole fluid flows into the cylinder (1) through the wellhead equipment (2) and flows through the power generation assembly (3), and can rotate in response to the action of the downhole fluid, thereby driving the second part (312) to rotate for power generation.

2. The wellhead power generation device according to claim 1, characterized in that: The power generation impeller (33) is constructed as an angle-adjustable structure.

3. The wellhead power generation device according to claim 2, characterized in that: The first part (311) is connected with an adjustable guide vane (34) which is circumferentially extending in all directions and has an adjustable angle.

4. The wellhead power generation device according to claim 3, characterized in that: The adjustable guide vane (34) is arranged on the first part (311) at a position between the supporting guide vane (32) and the power generation impeller (33).

5. The wellhead power generation device according to claim 4, characterized in that: The generator (31) comprises a second part (312) and two first parts (311) respectively located at two ends of the second part (312).

6. The wellhead power generation device according to any one of claims 1 to 5, characterized in that: The number of support guide vanes (32) located in the same section of the first portion (311) in the axial direction is an odd number.

7. The wellhead power generation device according to any one of claims 1 to 5, characterized in that: The number of adjustable guide vanes (34) located in the same section of the first portion (311) in the axial direction is an even number.

8. The wellhead power generation device according to any one of claims 1 to 5, characterized in that: The number of the power generation impellers (33) located in the same section of the second part (312) in the axial direction is an even number.

9. The wellhead power generation device according to any one of claims 1 to 5, characterized in that: It comprises a power transmission line (4), one end of which is connected to the power generation assembly (3), and the other end of which passes through the cylinder (1) and is connected to an external line.

10. The wellhead power generation device according to any one of claims 1 to 5, characterized in that: A plurality of power generation components (3) are arranged axially inside the cylinder (1).

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