Center sand setting type long plunger sand prevention oil well pump

Abstract

A center sand setting type long plunger sand prevention oil well pump relates to the technical field of oil well pumps and comprises an outer pipe, a pump cylinder is coaxially and fixedly arranged in the outer pipe, a plunger is vertically lifted in the pump cylinder, the lower end of the pump cylinder is connected with an impact type oil discharger, the touch end of the impact type oil discharger is located below the plunger, and the outlet end of the impact type oil discharger penetrates through the outer pipe. The air inlet is communicated with the outside; the lower end of the outer pipe is connected with a bottom sand setting pipe, the lower end of the impact type oil discharger is connected with a fixing valve, the lower end of the fixing valve is connected with an oil inlet valve, and the lower end of the oil inlet valve is connected with an upper sand setting pipe located above the bottom sand setting pipe. The oil well pump solves the problems that in the using process of an oil well pump in the prior art, fine gravels easily enter an oil pumping valve, so that the fine gravels easily block a liquid inlet valve, and the oil pumping stability of the oil well pump is affected as time passes through.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well pumps, in particular to a central sand settling type long plunger sand prevention 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 the announcement number CN204003391U. The upper part of the diverter joint of the solution is connected to the lower part of the pump barrel, the upper part of the pump barrel is installed with a sand retaining seat, the sand retaining valve is set on the connecting rod, the lower part of the connecting rod is connected to the upper part of the solid plunger, the solid plunger is placed in the pump barrel, the lower part of the diverter joint has a thread connected to the discharge valve, the lower part of the diverter joint has another thread connected to the upper part of the connecting barrel, the lower part of the connecting barrel is connected to the upper part of the oil inlet valve, and the oil inlet valve is connected to the upper part of the oil inlet valve. The lower part is connected with the upper part of the sand settling joint. The sand settling joint is provided with an oil inlet hole, an inner channel and a sand settling channel. The lower part of the inner channel is installed with a blockage. The lower part of the guide tube is connected with the thread outside the sand settling channel on the upper part of the sand settling joint. The lower part of the sand settling joint is connected to the sand settling tail pipe. The bottom of the sand settling tail pipe is closed, and the pump barrel outlet is covered by the sand retaining valve. The sand particles in the oil pipe on the pump sink and are introduced into the annular channel, and sink into the sand settling tail pipe through the sand settling channel, so that the sand particles on the upper end of the pump barrel are deposited under the pump to avoid sand jam and sand burying the oil pump.

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

[0007] First, during use of the existing oil well pump, small gravel can easily enter the oil well valve, causing the small gravel to easily clog the liquid inlet valve, which will affect the oil pumping stability of the oil well pump over time.

[0008] Second, during the downstroke of the plunger in the oil pump, oil tends to accumulate at the bottom of the pump barrel, causing the fixed valve to be subjected to a large downstroke pressure of the plunger, which affects the service life of the fixed valve.

[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 problem that during the use of the traditional oil pump, fine sand and gravel easily enter the oil pumping valve, making it easy for the fine sand and gravel to clog the liquid inlet valve, and affecting the oil pumping stability of the oil pump over time.

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

[0012] A central sand settling long plunger sand control oil pump comprises an outer tube, a pump barrel is coaxially fixedly provided in the outer tube, a plunger is vertically raised and lowered in the pump barrel, an impact oil unloader is connected to the lower end of the pump barrel, the contact end of the impact oil unloader is located below the plunger, and the outlet end of the impact oil unloader passes through the outer tube and is connected to the outside world;

[0013] The lower end of the outer tube is connected to a bottom sand settling pipe, the lower end of the impact oil unloader is connected to a fixed valve, the lower end of the fixed valve is connected to an oil inlet valve, and the lower end of the oil inlet valve is connected to an upper sand settling pipe located above the bottom sand settling pipe.

[0014] As an optimized solution, a reducing connecting tube is fixedly connected to the inner wall of the outer tube, and the upper end portion of the upper sand settling tube is connected to the reducing connecting tube.

[0015] As an optimized solution, a sand settling port is provided at the lower end of the oil inlet valve, and the sand settling port is communicated with the upper sand settling pipe.

[0016] As an optimized solution, an upper oil inlet sieve hole communicating with the bottom sand settling pipe is provided on the side wall of the oil inlet valve.

[0017] As an optimized solution, a bottom oil inlet sieve hole is opened on the peripheral wall of the bottom sand settling tube.

[0018] As an optimized solution, the pump barrel is provided with two sections from top to bottom, and the two sections of the pump barrel are connected by a connecting coupling.

[0019] As an optimized solution, a centering joint is provided between the pump barrel at the top and the outer tube.

[0020] As an optimized solution, the lower end of the plunger is connected to a downstream movable valve.

[0021] As an optimized solution, the upper end of the plunger is connected to an upstream movable valve via an upstream movable valve joint.

[0022] As an optimized solution, the top of the upstream movable valve is connected to a sucker rod threaded interface.

[0023] As an optimized solution, the upper end of the outer tube is connected to an upper joint.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] By setting up a bottom sand settling pipe and utilizing the bottom oil inlet sieve hole to block large pieces of sand and gravel, the small pieces of sand and gravel entering can be settled and collected through the inner bottom of the bottom sand settling pipe;

[0026] By setting an upper sand settling pipe on the oil inlet valve, the tiny gravel entering the oil inlet valve can be settled, preventing the gravel from entering the plunger through the oil inlet valve, thereby improving the flexibility of the oil well pump;

[0027] By arranging an impact oil unloader above the fixed valve, it is achieved that when the plunger hits the touch end of the impact oil unloader during the stroke, the internal oil will be discharged to the outside through the oil outlet, reducing the pressure on the fixed valve during the plunger's downstroke and extending the service life of the fixed valve and the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 It is a structural diagram of the present utility model.

[0030] In the figure: 1-outer tube; 2-pump barrel; 3-plunger; 4-impact oil unloader; 5-touch end; 6-outlet end; 7-downstream movable valve; 8-upstream movable valve joint; 9-upstream movable valve; 10-sucker rod threaded interface; 11-connecting coupling; 12-righting joint; 13-oil inlet valve; 14-upper sand settling pipe; 15-bottom sand settling pipe; 16-bottom oil inlet sieve hole; 17-upper oil inlet sieve hole; 18-reducing connecting cylinder; 19-fixed valve. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 As shown, the central sand settling long plunger sand control oil pump comprises an outer tube 1, a pump barrel 2 is coaxially fixedly provided in the outer tube 1, a plunger 3 is vertically raised and lowered in the pump barrel 2, an impact oil unloader 4 is connected to the lower end of the pump barrel 2, a contact end 5 of the impact oil unloader is located below the plunger 3, and an outlet end 6 of the impact oil unloader passes through the outer tube 1 and is connected to the outside world;

[0033] The lower end of the outer tube 1 is connected to the bottom sand settling pipe 15, the lower end of the impact oil unloader is connected to the fixed valve 19, the lower end of the fixed valve 19 is connected to the oil inlet valve 13, and the lower end of the oil inlet valve 13 is connected to the upper sand settling pipe 14 located above the bottom sand settling pipe 15.

[0034] A reducing connecting tube 18 is fixedly connected to the inner wall of the outer tube 1 , and the upper end portion of the upper sand settling tube 14 is connected to the reducing connecting tube.

[0035] A sand settling port is provided at the lower end of the oil inlet valve 13 , and the sand settling port is communicated with the upper sand settling pipe 14 .

[0036] An upper oil inlet sieve hole 17 communicating with the bottom sand settling pipe 15 is provided on the side wall of the oil inlet valve 13 .

[0037] A bottom oil inlet sieve hole 16 is provided on the peripheral wall of the bottom sand settling pipe 15 .

[0038] The pump barrel 2 is provided with two sections from top to bottom, and the two sections of the pump barrel 2 are connected by a connecting coupling 11.

[0039] A stabilizing joint 12 is provided between the upper pump barrel 2 and the outer tube 1 .

[0040] The lower end of the plunger 3 is connected to a downstream valve 7 .

[0041] The upper end of the plunger 3 is connected to an upstream movable valve 9 via an upstream movable valve connector 8 .

[0042] The top of the upstream movable valve 9 is connected with a sucker rod threaded interface 10 .

[0043] The upper end of the outer tube 1 is connected to an upper joint.

[0044] The working principle of this device is:

[0045] By setting up the bottom sand settling pipe 15 and utilizing the bottom oil inlet sieve hole 16, large pieces of sand and gravel can be blocked, and the small pieces of sand and gravel entering can be settled and collected through the inner bottom of the bottom sand settling pipe 15;

[0046] By arranging an upper sand settling pipe 14 on the oil inlet valve 13, the tiny gravel entering the oil inlet valve 13 is settled, preventing the gravel from entering the plunger 3 through the oil inlet valve 13, thereby improving the flexibility of the oil pump;

[0047] By arranging an impact oil unloader above the fixed valve 19, it is achieved that when the plunger 3 hits the touch end 5 of the impact oil unloader during the stroke, the internal oil will be discharged to the outside through the oil outlet, reducing the pressure on the fixed valve 19 during the downstroke of the plunger 3, and extending the service life of the fixed valve 19 and the oil pump.

[0048] 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. Center sand settling long plunger sand control oil pump, characterized by: The invention comprises an outer tube (1), a pump barrel (2) is coaxially fixedly provided in the outer tube (1), a plunger (3) is vertically raised and lowered in the pump barrel (2), a percussion oil unloader (4) is connected to the lower end of the pump barrel (2), a contact end (5) of the percussion oil unloader (4) is located below the plunger (3), and an outlet end (6) of the percussion oil unloader (4) passes through the outer tube (1) and is in communication with the outside world; The lower end of the outer tube (1) is connected to a bottom sand settling pipe (15), the lower end of the impact oil unloader (4) is connected to a fixed valve (19), the lower end of the fixed valve (19) is connected to an oil inlet valve (13), and the lower end of the oil inlet valve (13) is connected to an upper sand settling pipe (14) located above the bottom sand settling pipe (15).

2. The central sand settling long plunger sand control oil well pump according to claim 1, characterized in that: A reduced diameter connecting tube (18) is fixedly connected to the inner wall of the outer tube (1), and the upper end portion of the upper sand settling tube (14) is connected to the reduced diameter connecting tube.

3. The central sand settling long plunger sand control oil well pump according to claim 2, characterized in that: The lower end of the oil inlet valve (13) is provided with a sand settling port, and the sand settling port is communicated with the upper sand settling pipe (14).

4. The central sand settling long plunger sand control oil well pump according to claim 3, characterized in that: An upper oil inlet sieve hole (17) communicating with the bottom sand settling pipe (15) is provided on the side wall of the oil inlet valve (13).

5. The central sand settling long plunger sand control oil well pump according to claim 4, characterized in that: A bottom oil inlet sieve hole (16) is provided on the peripheral wall of the bottom sand settling pipe (15).

6. The central sand settling long plunger sand control oil well pump according to claim 5, characterized in that: The pump barrel (2) is provided with two sections from top to bottom, and the two sections of the pump barrel (2) are connected via a connecting hoop (11).

7. The central sand settling long plunger sand control oil well pump according to claim 6, characterized in that: A straightening joint (12) is provided between the upper pump barrel (2) and the outer tube (1).

8. The central sand settling long plunger sand control oil well pump according to claim 7, characterized in that: The lower end of the plunger (3) is connected to a downstream movable valve (7).

9. The central sand settling long plunger sand control oil well pump according to claim 8, characterized in that: The upper end of the plunger (3) is connected to an upstream movable valve (9) via an upstream movable valve connector (8).

10. The central sand settling long plunger sand control oil well pump according to claim 9, characterized in that: The top of the upstream movable valve (9) is connected to a sucker rod threaded interface (10).

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