Efficient sand-prevention energy-saving type whole-barrel type oil well pump

Abstract

An efficient sand-prevention energy-saving type whole-barrel oil well pump relates to the technical field of oil well pumps and comprises an outer pipe, a lower pump barrel is coaxially arranged in the outer pipe, a solid plunger is slidably arranged in the lower pump barrel in the vertical direction, a load shedding valve is fixedly connected between the outer pipe and the lower pump barrel, a breathing hole is formed in the load shedding valve, one end of an arc-shaped hole is communicated with the outside, and the other end of the arc-shaped hole is communicated with the outside. The lower end of the outer pipe is connected with a traveling valve assembly, the lower end of the traveling valve assembly is connected with a fixed valve assembly, and the lower end of the fixed valve assembly is connected with a sand control screen pipe. The oil well pump solves the problems that in the prior art, when a plunger of an oil well pump is in an upstroke, due to the fact that internal pressure and external pressure are unbalanced and downward load is low during a downstroke, a plunger rod is bent, and the service life is affected; and in order to ensure the overflowing area, an existing sand control screen pipe cannot filter finer sand grains, and the sand control effect is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well pumps, in particular to a high-efficiency sand-proof and energy-saving whole-barrel oil well pump. Background Art

[0002] Conventional oil well pumps used in oil wells with a high oil-gas ratio suffer from poor oil filling, low pump efficiency, and sometimes even experience "gas lock," which prevents the pump from functioning properly and reduces oil production. Even more harmful is the frequent occurrence of "liquid level shock" when pumping oil in such wells, which accelerates damage to downhole equipment such as the sucker rod, pump valves, and tubing.

[0003] At the same time, the sand content in crude oil is relatively high. When the oil well pump is pumping oil, sand particles can easily enter between the plunger and the pump barrel. When sand particles enter between the plunger and the pump barrel, the wear of the plunger and the pump barrel will be accelerated, and even the pump will be stuck, resulting in a decrease in the service life of the oil well pump and a decrease in oil well production.

[0004] Currently, many oil well pump manufacturers, in response to oil wells with high oil-gas ratios, use a method called drilling holes in the pump barrel to achieve secondary oil injection to improve oil recovery efficiency. While this method can improve oil recovery efficiency in gas-bearing wells, sand particles in the crude oil can enter the pump chamber through the secondary oil injection holes in the pump barrel, causing premature wear and failure of the sealing surfaces of the pump barrel and plunger.

[0005] The prior art discloses a patent with announcement number CN107084123A. This solution includes a pump barrel assembly, a plunger assembly housed within the pump barrel assembly, an inner barrel and an outer barrel, a sand settling chamber formed between the inner and outer barrels, a plunger assembly engaged with a friction pair of the inner barrel, a salvage joint provided at the lower end of the plunger assembly, a seat seal joint at the lower end, a fixed valve assembly provided within the seat seal joint, and the salvage joint connectable to the fixed valve assembly. The present invention provides an annular fixed sand settling chamber outside the pump barrel that can accommodate 10 to 20 liters of sand. Even if pumping is stopped, sand particles in the oil pipe that fall down cannot enter the friction pair formed by the pump barrel and the plunger, nor can they accumulate at the mouth of the pump barrel. Instead, they fall into the annular fixed sand settling chamber, thus avoiding sand burial and sand stuck in the plunger. The present invention has a strong sand prevention function, can effectively reduce the operation frequency, extend the pump inspection cycle, and significantly reduce mining costs.

[0006] As the existing devices are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0007] First, the plunger of the existing oil well pump is bent due to the imbalance of internal and external pressures during the upstroke and the low downward load during the downstroke, which shortens the service life of the plunger.

[0008] Second, in order to ensure the flow area, the existing sand control screen cannot filter finer sand particles, which reduces the sand control effect.

[0009] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0010] In response to the defects in the existing technology, the utility model solves the problems in the traditional technology that the plunger of the oil pump bends the plunger rod during the upstroke due to the imbalance of internal and external pressures and the low downward load during the downstroke, thereby affecting the service life; and the existing sand control screen pipe cannot filter finer sand particles in order to ensure the flow area, thereby reducing the sand control effect.

[0011] In order to solve the above problems, the present invention provides the following technical solutions:

[0012] The high-efficiency sand-proof and energy-saving whole-barrel oil pump comprises an outer tube, a lower pump barrel is coaxially arranged in the outer tube, a solid plunger is vertically slidably arranged in the lower pump barrel, a load-reducing valve is fixedly connected between the outer tube and the lower pump barrel, and a breathing hole is provided on the load-reducing valve, one end of the breathing hole is connected to the outside world, and the other end is connected to the area of the lower pump barrel above the solid plunger.

[0013] The lower end of the outer tube is connected to a floating valve assembly, the lower end of the floating valve assembly is connected to a fixed valve assembly, the lower end of the fixed valve assembly is connected to a sand control screen pipe, the circumferential wall of the sand control screen pipe is surrounded by sieve holes, and the outer wall of the sand control screen pipe where the sieve holes are located is wrapped with wire.

[0014] As an optimized solution, the upper end of the lower pump barrel is coaxially fixed with an upper pump barrel with a diameter smaller than that of the lower pump barrel, and the upper end of the solid plunger is fixed with a plunger rod slidably inserted into the upper pump barrel.

[0015] As an optimized solution, a channel is provided on the unloading valve to connect the area between the upper pump barrel and the outer tube and the area between the lower pump barrel and the outer tube.

[0016] As an optimized solution, a centralizing sleeve is fixedly provided between the upper pump barrel and the outer tube.

[0017] As an optimized solution, the traveling valve assembly is provided with a liquid inlet bias flow channel connected to the lower port of the lower pump barrel.

[0018] As an optimized solution, the traveling valve assembly is provided with a liquid outlet bias flow channel connected to the area between the lower pump barrel and the outer tube.

[0019] As an optimized solution, the lower end of the sand control screen is connected to a tail pipe.

[0020] As an optimized solution, a guide pipe is fixedly connected to the area where the sieve holes are located in the sand control screen, and a guide channel is formed between the guide pipe and the sieve holes. The guide channel is connected to the lower end of the guide pipe.

[0021] As an optimized solution, a retaining ring is fixedly connected between the upper end of the flow guide pipe and the sand control screen pipe.

[0022] As an optimized solution, the upper end of the outer tube is connected to the oil pipe through a pump barrel coupling.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] By setting a solid plunger, the breathing hole balances the internal and external pressures during the upstroke, and the upstroke is only affected by the gravity of the rod column. During the downstroke, the external liquid injection pressure of the pump acts on the solid plunger, thereby increasing the downward load and preventing the rod from bending.

[0025] The traveling valve assembly adopts a fixed structure and does not move with the plunger. Compared with conventional traveling valves, it has a larger flow area and effectively reduces the flow resistance.

[0026] The wire winding method is combined with the sand control screen pipe to filter finer sand particles while ensuring the flow area. When the internal liquid flows through the downward channel, the heavier sand particles will settle downward, thereby achieving a sand control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0028] Figure 1 It is a structural diagram of the present utility model.

[0029] In the figure: 1-outer tube; 2-lower pump barrel; 3-solid plunger; 4-plunger rod; 5-unloading valve; 6-breathing hole; 7-channel; 8-upper pump barrel; 9-tail pipe; 10-pump barrel coupling; 11-oil pipe; 12-traveling valve assembly; 13-liquid inlet bias flow channel; 14-liquid outlet bias flow channel; 15-fixed valve assembly; 16-sand control screen; 17-sieve hole; 18-wire wrap; 19-guide pipe; 20-retaining ring. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0031] like Figure 1 As shown, the high-efficiency sand-proof and energy-saving whole-barrel oil well pump comprises an outer tube 1, a lower pump barrel 2 is coaxially arranged in the outer tube 1, a solid plunger 3 is vertically slidably arranged in the lower pump barrel 2, a load-reducing valve 5 is fixedly connected between the outer tube 1 and the lower pump barrel 2, and a breathing hole 6 is opened on the load-reducing valve 5, one end of the breathing hole is connected to the outside world, and the other end is connected to the area of the lower pump barrel 2 above the solid plunger 3.

[0032] The lower end of the outer tube 1 is connected to a floating valve assembly 12, the lower end of the floating valve assembly 12 is connected to a fixed valve assembly 15, the lower end of the fixed valve assembly 15 is connected to a sand control screen pipe 16, and the sand control screen pipe 16 has sieve holes 17 arranged around its peripheral wall, and a wire wrap 18 is wrapped around the outer wall of the sand control screen pipe where the sieve holes 17 are located.

[0033] The upper end of the lower pump barrel 2 is coaxially fixedly connected to an upper pump barrel 8 having a smaller diameter than the lower pump barrel 2 , and the upper end of the solid plunger 3 is fixedly connected to a plunger rod 4 that is slidably inserted into the upper pump barrel 8 .

[0034] The unloading valve 5 is provided with a channel 7 which connects the area between the upper pump barrel 8 and the outer tube 1 and the area between the lower pump barrel 2 and the outer tube 1 .

[0035] A centralizing sleeve is fixedly provided between the upper pump barrel 8 and the outer tube 1 .

[0036] The traveling valve assembly 12 is provided with a liquid inlet bias flow channel 13 which is connected to the lower port of the lower pump barrel 2 .

[0037] The traveling valve assembly 12 is provided with a liquid outlet biasing flow channel 14 communicating with the area between the lower pump barrel 2 and the outer tube 1 .

[0038] The lower end of the sand control screen 16 is connected to the tail pipe 9 .

[0039] A flow guide pipe 19 is fixedly connected to the area where the sieve holes 17 are located in the sand control screen 16 . A flow guide channel 7 is formed between the flow guide pipe 19 and the sieve holes 17 . The flow guide channel 7 is connected to the lower end of the flow guide pipe 19 .

[0040] A retaining ring 20 is fixedly connected between the upper end of the flow guide pipe 19 and the sand control screen 16 .

[0041] The upper end of the outer tube 1 is connected to the oil pipe 11 through a pump barrel coupling 10 .

[0042] The working principle of this device is:

[0043] By setting up the solid plunger 3, the breathing hole 6 balances the internal and external pressures during the upstroke. The upstroke is only affected by the gravity of the rod column. During the downstroke, the external liquid injection pressure of the pump acts on the solid plunger 3, thereby increasing the downward load and preventing the rod from bending.

[0044] The traveling valve assembly 12 adopts a fixed structure and does not move with the plunger. Compared with conventional traveling valves, it has a larger flow area and effectively reduces the flow resistance.

[0045] The combination of the winding wire 18 and the sand control screen 16 can filter finer sand particles while ensuring the flow area. When the internal liquid flows through the downward channel 7, the heavier sand particles will settle downward, thereby achieving a sand control effect.

[0046] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. High-efficiency sand-proof and energy-saving whole-barrel oil well pump, characterized by: The utility model comprises an outer tube (1), wherein a lower pump barrel (2) is coaxially provided in the outer tube (1), a solid plunger (3) is vertically slidably provided in the lower pump barrel (2), a load-reducing valve (5) is fixedly connected between the outer tube (1) and the lower pump barrel (2), and a breathing hole (6) is provided on the load-reducing valve (5), one end of the breathing hole is connected to the outside world, and the other end is connected to the area of the lower pump barrel (2) above the solid plunger (3). The lower end of the outer tube (1) is connected to a floating valve assembly (12), the lower end of the floating valve assembly (12) is connected to a fixed valve assembly (15), the lower end of the fixed valve assembly (15) is connected to a sand control screen pipe (16), the circumferential wall of the sand control screen pipe (16) is provided with a sieve hole (17), and the outer wall of the sand control screen pipe where the sieve hole (17) is located is wound with a wire (18).

2. The high-efficiency sand-control and energy-saving integral barrel oil well pump according to claim 1 is characterized in that: The upper end of the lower pump barrel (2) is coaxially fixedly connected to an upper pump barrel (8) having a smaller diameter than the lower pump barrel (2), and the upper end of the solid plunger (3) is fixedly connected to a plunger rod (4) which is slidably inserted into the upper pump barrel (8).

3. The high-efficiency sand-control and energy-saving integral barrel oil well pump according to claim 2 is characterized in that: The unloading valve (5) is provided with a channel (7) connecting the area between the upper pump barrel (8) and the outer tube (1) and the area between the lower pump barrel (2) and the outer tube (1).

4. The high-efficiency sand-control and energy-saving integral barrel oil well pump according to claim 3 is characterized by: A centralizing sleeve is fixedly provided between the upper pump barrel (8) and the outer tube (1).

5. The high-efficiency sand-control and energy-saving integral-barrel oil well pump according to claim 4 is characterized in that: The traveling valve assembly (12) is provided with a liquid inlet biasing flow channel (13) which is in communication with the lower port of the lower pump barrel (2).

6. The high-efficiency sand-control and energy-saving integral-barrel oil well pump according to claim 5 is characterized in that: The traveling valve assembly (12) is provided with a liquid outlet bias flow channel (14) communicating with the area between the lower pump barrel (2) and the outer tube (1).

7. The high-efficiency sand-control and energy-saving integral-barrel oil well pump according to claim 6 is characterized in that: The lower end of the sand control screen pipe (16) is connected to a tail pipe (9).

8. The high-efficiency sand-control and energy-saving integral barrel oil well pump according to claim 7 is characterized in that: A flow guide pipe (19) is fixedly connected to the area where the sieve holes (17) are located in the sand control screen pipe (16), and a flow guide channel (7) is formed between the flow guide pipe (19) and the sieve holes (17). The flow guide channel (7) is communicated with the lower end of the flow guide pipe (19).

9. The high-efficiency sand-control and energy-saving integral-barrel oil well pump according to claim 8, characterized in that: A retaining ring (20) is fixedly connected between the upper end of the flow guide pipe (19) and the sand control screen pipe (16).

10. The high-efficiency sand-control and energy-saving integral-barrel oil well pump according to claim 9, characterized in that: The upper end of the outer tube (1) is connected to an oil pipe (11) via a pump barrel coupling (10).

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