Downhole rotational flow resistance reduction rotating rod type piston pump

Abstract

The utility model relates to an underground rotational flow resistance reduction rotating rod type piston pump which comprises a pump cylinder with the two ends communicating with an oil pipe, a fixed valve arranged at the bottom of the pump cylinder, a plunger arranged in the pump cylinder, a lower traveling valve arranged at the bottom of the plunger and an upper traveling valve arranged at the top of the plunger. An oil outlet communicated with the upper traveling valve is formed in the top of the plunger, the plunger is in sliding connection with the pump cylinder, a first swirler is arranged at the end, away from the sucker rod, of the fixed valve, a second swirler is arranged at the end, away from the sucker rod, of the lower traveling valve, and a third swirler is arranged at the end, away from the sucker rod, of the upper traveling valve. The first swirler comprises a first swirling vane, and the second swirler and the third swirler are the same as the first swirler in structure. Petroleum forms vortex through the first rotational flow blade, the influence of the bottleneck effect on the oil pumping process is reduced, the speed of the petroleum passing through the fixed valve, the lower traveling valve and the upper traveling valve is increased, and therefore the oil pumping efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of oil extraction machinery technology, and in particular to a downhole vortex-driven, drag-reducing rotary piston pump. Background Technology

[0002] In the process of oil extraction, oil flowing into the bottom of the well needs to be pumped to the surface using an oil pumping unit for transportation and use. The oil pump is a key component in the oil pumping process.

[0003] The oil pump includes a pump barrel housed in the tubing, a plunger slidably connected to the pump barrel, a fixed valve located at the bottom of the pump barrel, a downstream moving valve located at the bottom of the plunger, and an upstream moving valve located at the top of the plunger. The plunger is connected to the sucker rod. The fixed valve includes a fixed valve seat, a fixed valve, and a fixed valve cover mounted on the pump barrel. During oil pumping, when oil passes through the fixed valve seat, the bottleneck effect results in high inlet resistance, thus reducing pumping efficiency. Furthermore, oil passing through the downstream and upstream moving valves is also restricted by the bottleneck effect, further reducing pumping efficiency.

[0004] Regarding the aforementioned technologies, the inventors believe that oil is restricted by a bottleneck effect when passing through the fixed valve, downstream moving valve, and upstream moving valve, which reduces the oil pumping efficiency. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a downhole vortex-driven, drag-reducing rotary rod piston pump.

[0006] This application provides a downhole swirl-type drag-reducing rotary piston pump, which adopts the following technical solution:

[0007] A downhole swirling drag-reducing rotary piston pump includes a pump barrel with both ends connected to tubing, a fixed valve disposed at the bottom of the pump barrel, a plunger disposed in the pump barrel, a downstream moving valve disposed at the bottom of the plunger, and an upstream moving valve disposed at the top of the plunger. The top of the plunger is connected to the sucker rod, and the top of the plunger is provided with an oil outlet hole communicating with the upstream moving valve. The plunger is slidably connected to the pump barrel. A first swirler is disposed at the end of the fixed valve away from the sucker rod, a second swirler is disposed at the end of the downstream moving valve away from the sucker rod, and a third swirler is disposed at the end of the upstream moving valve away from the sucker rod. The first swirler includes a first swirling blade, and the second and third swirlers are structurally identical to the first swirler.

[0008] By adopting the above technical solution, the first cyclone causes the oil passing through the fixed valve to form a vortex, the second cyclone causes the oil passing through the downstream moving valve to form a vortex, and the third cyclone causes the oil passing through the upstream moving valve to form a vortex, thereby reducing the resistance to oil flow caused by the bottleneck effect and thus improving the oil pumping efficiency.

[0009] Preferably, the fixed valve includes a first valve seat fixedly disposed in the pump barrel, a first valve disposed on the first valve seat, and a first valve cover disposed in the pump barrel. The first swirl vane has a first conical hole at one end near the first valve seat. An oil inlet hole is provided on the first valve seat, and the first conical hole communicates with the oil inlet hole.

[0010] By adopting the above technical solution, the first conical hole is connected to the oil inlet hole. The first conical hole provides a flow space for the oil that forms a vortex, so that the oil that forms a vortex gathers at the first conical hole, which facilitates the oil to pass through the oil inlet hole and thus improves the oil pumping efficiency.

[0011] Preferably, the downstream moving valve includes a second valve seat disposed in the plunger, a second valve disposed on the second valve seat, and a second valve cover disposed in the plunger; the upstream moving valve includes a third valve seat disposed in the plunger and a third valve disposed on the third valve seat; the first valve cover includes a second swirl vane; and the structure of the second valve cover is the same as that of the first valve cover.

[0012] By adopting the above technical solution, the second swirl blade guides the oil flow, causing the oil to form a vortex and quickly pass through the first and second valves, reducing the bottleneck effect on the oil flow rate and thus improving the oil pumping efficiency.

[0013] Preferably, the second swirl blade has a second conical hole at one end near the first valve, and the top of the plunger has a limiting groove for limiting the third valve.

[0014] By adopting the above technical solution, when oil passes through the first valve seat, it pushes the first valve onto the first valve cover. The second conical hole on the first valve cover limits the movement of the first valve, thereby reducing the shaking caused by the oil flow and thus reducing turbulence. This further improves the efficiency of oil eddies passing through the fixed valve and ultimately increases the pumping efficiency. Similarly, the second valve cover limits the movement of the second valve, and the limiting groove on the top of the plunger limits the movement of the third valve, further reducing turbulence and improving pumping efficiency.

[0015] Preferably, the oil inlet hole of the first valve seat is provided with a flow guiding arc surface.

[0016] By adopting the above technical solution, the guide arc surface makes the oil passing through the first valve seat form a jet flow after passing through the oil inlet hole, which facilitates pushing the first valve into the second conical hole, so that the first valve remains stable in the second conical hole, thereby reducing the generation of turbulence and further improving the oil pumping efficiency.

[0017] Preferably, the sucker rod is rotatably connected to the plunger.

[0018] By adopting the above technical solution, during the process of the sucker rod driving the plunger to descend, the second hydrocyclone compresses the oil in the pump barrel to form a vortex. The plunger is pushed by the vortex, causing the plunger to rotate while descending, thereby reducing the resistance encountered by the plunger during descent, improving the efficiency of the plunger descent, and thus improving the oil extraction efficiency.

[0019] Preferably, there are multiple first swirl blades and multiple second swirl blades.

[0020] By adopting the above technical solution, multiple first swirl blades and multiple second swirl blades increase the flow velocity of oil forming vortices, thereby increasing the flow rate of oil and thus improving the oil pumping efficiency.

[0021] Preferably, the plunger is provided with a guide vane, the guide vane has a spiral structure, and the guide vane is located between the second valve cover and the third valve seat.

[0022] By adopting the above technical solution, the guide vanes guide the oil flowing in the plunger, thereby enabling the oil to pass through the plunger quickly and thus improving the oil pumping efficiency.

[0023] In summary, this application has the following beneficial technical effects:

[0024] 1. The first, second, and third hydrocyclones cause the oil to form vortices, thereby reducing the resistance to oil flow caused by the bottleneck effect and thus improving the oil extraction efficiency.

[0025] 2. The first and second valves guide the oil flow, causing it to form vortices, thereby increasing the oil flow rate and thus improving the oil extraction efficiency.

[0026] 3. The plunger is rotatably connected to the sucker rod, which causes the plunger to rotate due to the eddy current during its descent, thereby increasing the plunger's descent rate and thus improving the pumping efficiency. Attached Figure Description

[0027] Figure 1 This is a partial cross-sectional structural schematic diagram of the downhole swirl-drag-reducing rotary rod piston pump provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the fixed valve provided in the embodiment of this application;

[0029] Figure 3 This is a partial cross-sectional structural diagram of the plunger, downstream moving valve, upstream moving valve, and sucker rod provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the cross-sectional structure of the first valve seat and the first valve.

[0031] Explanation of reference numerals in the attached drawings: 1. Pump barrel; 2. Fixed valve; 21. First cyclone separator; 211. First cyclone vane; 212. First conical orifice; 22. First valve seat; 221. Oil inlet; 222. Guide arc surface; 23. First valve; 24. First valve cover; 241. Second cyclone vane; 242. Second conical orifice; 3. Piston; 31. Oil outlet; 32. Limiting groove; 33. Guide vane; 4. Downstream moving valve; 41. Second cyclone separator; 42. Second valve seat; 43. Second valve; 44. Second valve cover; 5. Upstream moving valve; 51. Third cyclone separator; 52. Third valve seat; 53. Third valve; 6. Sucker rod. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0033] This application discloses a downhole vortex-driven, drag-reducing rotary piston pump.

[0034] Reference Figure 1 , Figure 2 and Figure 3 A downhole swirling drag-reducing rotary piston pump includes a pump barrel 1 with both ends connected to tubing, a fixed valve 2 located at the bottom of the pump barrel 1, a plunger 3 located in the pump barrel 1, a downstream moving valve 4 located at the bottom of the plunger 3, and an upstream moving valve 5 located at the top of the plunger 3. The top of the plunger 3 is connected to a sucker rod 6, and the top of the plunger 3 has an oil outlet 31 communicating with the upstream moving valve 5. The plunger 3 is slidably connected to the pump barrel 1. A first swirler 21 is fixedly installed at the end of the fixed valve 2 away from the sucker rod 6, a second swirler 41 is fixedly installed at the end of the downstream moving valve 4 away from the sucker rod 6, and a third swirler 51 is fixedly installed at the end of the upstream moving valve 5 away from the sucker rod 6. The first swirler 21 includes a first swirling blade 211, and the second swirler 41 and the third swirler 51 have the same structure as the first swirler 21.

[0035] The fixed valve 2 includes a first valve seat 22 fixedly disposed in the pump cylinder 1, a first valve 23 disposed on the first valve seat 22, and a first valve cover 24 fixedly disposed in the pump cylinder 1. The first swirl vane 211 is provided with a first tapered hole 212 at one end near the first valve seat 22. The first valve seat 22 is provided with an oil inlet hole 221, and the first tapered hole 212 communicates with the oil inlet hole 221.

[0036] The downstream valve 4 includes a second valve seat 42 disposed in the plunger 3, a second valve 43 disposed on the second valve seat 42, and a second valve cover 44 disposed in the plunger 3. The upstream valve 5 includes a third valve seat 52 disposed in the plunger 3 and a third valve 53 disposed on the third valve seat 52. The first valve cover 24 includes a second swirl vane 241, and a second conical hole 242 is formed at one end of the second swirl vane 241 near the first valve 23. A limiting groove 32 is provided on the top of the plunger 3 to limit the movement of the third valve 53. The structure of the second valve cover 44 is the same as that of the first valve cover 24.

[0037] The sucker rod 6 is rotatably connected to the plunger 3 via a bearing.

[0038] The number of first swirl vanes 211 and second swirl vanes 241 is two or more, including two. In the embodiments of this application, the number of first swirl vanes 211 and second swirl vanes 241 is four. The four first swirl vanes 211 and the four second swirl vanes 241 increase the flow velocity of the oil forming vortices, thereby increasing the oil flow rate and thus improving the oil pumping efficiency.

[0039] A guide vane 33 is fixedly disposed in the plunger 3. The guide vane 33 has a spiral structure and is located between the second valve cover 44 and the third valve seat 52. In the embodiment of this application, there are two guide vanes 33.

[0040] Reference Figure 3 and Figure 4 The first valve seat 22 has a guide arc surface 222 in its oil inlet hole 221. The first valve 23 abuts against the guide arc surface 222. The second valve seat 42 and the third valve seat 52 have the same structure as the first valve seat 22.

[0041] The implementation principle of a downhole vortex-driven piston pump according to an embodiment of this application is as follows: The sucker rod 6 drives the plunger 3 to rise. The first vortex 21 guides the oil in the tubing, causing the oil to form a vortex and pass through the first conical hole 212 and quickly through the inlet hole 221, thereby pumping the oil into the pump barrel 1. The vortex formed by the oil passing through the inlet hole 221 reduces the resistance caused by the bottleneck effect on the oil, thereby improving the smoothness of the oil passing through the fixed valve 2 and thus improving the pumping efficiency. When the oil passes through the inlet hole 221 after being guided by the guide arc surface 222, it forms a jet stream. The jet stream pushes the first valve 23 to move into the second conical hole 242. The second conical hole 242 limits the first valve 23, thereby reducing the shaking generated by the first valve 23 and thus reducing the generation of turbulence. The first valve cover 24 guides the oil vortex, allowing the oil to pass through the first valve cover 24 quickly, further improving the smoothness of the oil passing through the fixed valve 2 and further improving the pumping efficiency. Similarly, the second cyclone separator 41 creates a vortex in the oil passing through the downstream moving valve 4, and the second valve cover 44 limits the second valve 43, thereby improving the smoothness of oil passing through the downstream moving valve 4. The third cyclone separator 51 creates a vortex in the oil passing through the upstream moving valve 5, and the limiting groove 32 limits the third valve 53, thereby improving the smoothness of oil passing through the upstream moving valve 5, and thus improving the oil pumping efficiency. The plunger 3 is rotatably connected to the sucker rod 6 through a bearing. When the plunger 3 descends, the second cyclone separator 41 compresses the oil in the pump barrel 1 to form a vortex. The vortex pushes the plunger 3 to rotate while descending, thereby reducing the resistance encountered by the plunger 3 during the descent, thereby improving the efficiency of the plunger 3's descent, and further improving the oil pumping efficiency.

[0042] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A downhole vortex-driven piston pump with reduced drag, comprising a pump barrel (1) with both ends connected to tubing, a fixed valve (2) disposed at the bottom of the pump barrel (1), a plunger (3) disposed in the pump barrel (1), a downstream moving valve (4) disposed at the bottom of the plunger (3), and an upstream moving valve (5) disposed at the top of the plunger (3), wherein the top of the plunger (3) is connected to a sucker rod (6), and the top of the plunger (3) is provided with an oil outlet (31) communicating with the upstream moving valve (5), and the plunger (3) is slidably connected to the pump barrel (1), characterized in that: The fixed valve (2) is provided with a first cyclone separator (21) at the end away from the sucker rod (6), the downstream moving valve (4) is provided with a second cyclone separator (41) at the end away from the sucker rod (6), and the upstream moving valve (5) is provided with a third cyclone separator (51) at the end away from the sucker rod (6). The first cyclone separator (21) includes a first cyclone blade (211), and the second cyclone separator (41) and the third cyclone separator (51) are both structurally the same as the first cyclone separator (21).

2. The downhole vortex-driven, drag-reducing rotary rod piston pump according to claim 1, characterized in that: The fixed valve (2) includes a first valve seat (22) fixedly disposed in the pump barrel (1), a first valve (23) disposed on the first valve seat (22) and a first valve cover (24) disposed in the pump barrel (1). The first swirl vane (211) is provided with a first conical hole (212) at one end near the first valve seat (22). The first valve seat (22) is provided with an oil inlet hole (221), and the first conical hole (212) communicates with the oil inlet hole (221).

3. The downhole vortex-driven drag-reducing rotary rod piston pump according to claim 2, characterized in that: The downstream moving valve (4) includes a second valve seat (42) disposed in the plunger (3), a second valve (43) disposed on the second valve seat (42), and a second valve cover (44) disposed in the plunger (3). The upstream moving valve (5) includes a third valve seat (52) disposed in the plunger (3) and a third valve (53) disposed on the third valve seat (52). The first valve cover (24) includes a second swirl vane (241). The structure of the second valve cover (44) is the same as that of the first valve cover (24).

4. The downhole vortex-driven drag-reducing rotary rod piston pump according to claim 3, characterized in that: The second swirl blade (241) has a second conical hole (242) at one end near the first valve (23), and the top of the plunger (3) is provided with a limiting groove (32) to limit the third valve (53).

5. A downhole vortex-driven, drag-reducing rotary rod piston pump according to claim 4, characterized in that: The first valve seat (22) has a flow guide arc surface (222) in the oil inlet (221).

6. A downhole vortex-driven, drag-reducing rotary rod piston pump according to claim 5, characterized in that: The sucker rod (6) is rotatably connected to the plunger (3).

7. A downhole vortex-driven, drag-reducing rotary rod piston pump according to claim 6, characterized in that: The number of the first swirl blade (211) and the second swirl blade (241) are both multiple.

8. A downhole vortex-driven, drag-reducing rotary rod piston pump according to claim 7, characterized in that: The plunger (3) is provided with a guide vane (33), which has a spiral structure and is located between the second valve cover (44) and the third valve seat (52).

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