Forced reset long plunger sand prevention oil well pump capable of well flushing

Abstract

The utility model relates to the technical field of oil well pumps, in particular to a conventional well flushing forced reset long plunger sand prevention oil well pump which comprises a pump cylinder and a connecting pipe which are arranged in parallel from top to bottom, an oil drainage channel is arranged on the peripheral wall of the pump cylinder, a plunger is arranged between the pump cylinder and the connecting pipe in a reciprocating sliding mode, the plunger always closes the oil drainage channel in an oil extraction state, and the plunger closes the oil drainage channel in a well flushing state. And the upper end part of the plunger is lower than the oil drainage channel. The oil well pump solves the problems that in the prior art, an oil drain device needs to be arranged on an oil well pump to achieve well washing operation, but impurities in oil easily block the oil drain device along with use, normal well washing operation is affected, the failure rate of a pump cylinder is increased due to the arrangement of the oil drain device, and normal work of the oil well pump is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well pumps, in particular to a long plunger sand prevention oil well pump capable of positive well washing and forced reset. Background Art

[0002] When conventional oil well pumps are used in oil wells where the natural gas content is relatively high compared to the crude oil content, the oil filling degree is poor and the pump efficiency is low. 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 the oil well production.

[0003] The prior art discloses a patent CN218407761U, which includes a vertically arranged pump barrel, the lower end of which is coaxially fixedly connected to a pump barrel connecting pipe, and a plunger is slidably installed in the pump barrel and the pump barrel connecting pipe. This solves the problem in traditional technology that during use of the oil pump, due to the up and down reciprocating movement of the plunger, sand and gravel are easily carried between the plunger and the pump barrel, and the inner wall of the pump barrel is prone to structural damage over time.

[0004] As the existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] First, the existing oil well pump needs to be equipped with an oil drain to achieve well washing operations. However, with use, impurities in the oil are prone to block the oil drain, thereby affecting the normal progress of the well washing operation. In addition, the oil drain increases the failure rate of the pump barrel, affecting the normal operation of the oil well pump.

[0006] Second, during the downstroke of the existing rod string, the valve ball in the valve group cannot return to its position quickly due to the high viscosity of the heavy oil, which in turn affects the oil pumping efficiency.

[0007] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0008] In response to the defects in the existing technology, the utility model solves the problem that the oil pump in the traditional technology needs to be equipped with an oil drain to realize the well washing operation, but with use, impurities in the oil are likely to clog the oil drain, thereby affecting the normal progress of the well washing operation, and the oil drain increases the failure rate of the pump barrel, affecting the normal operation of the oil pump.

[0009] In order to solve the above problems, the present invention provides the following technical solutions:

[0010] The positive well washing forced reset long plunger sand prevention oil well pump, which comprises a pump barrel and a connecting pipe arranged side by side from top to bottom, a leakage passage is formed in the peripheral wall of the pump barrel, a plunger is arranged to reciprocate in the pump barrel and the connecting pipe, the plunger always seals the leakage passage in the oil production state, and the upper end of the plunger is lower than the leakage passage in the well washing state.

[0011] As an optimized scheme, the pump barrel is coaxially sleeved with a flow guide cover, a flow guide cavity is arranged between the inner wall of the flow guide cover and the outer wall of the pump barrel, and the lower end of the flow guide cover is arranged to be open and lower than the leakage passage.

[0012] As an optimized scheme, the upper end of the flow guide cover is fixedly connected with the upper end of the pump barrel through an upper joint.

[0013] As an optimized scheme, the upper and lower ends of the plunger are correspondingly connected with upper and lower traveling valves.

[0014] As an optimized scheme, an intermediate joint is fixedly connected between the lower end of the pump barrel and the upper end of the connecting pipe.

[0015] As an optimized scheme, a lower joint is fixedly connected to the lower end of the connecting pipe, and a fixed valve is fixedly connected to the lower joint.

[0016] As an optimized scheme, the upper and lower traveling valves and the fixed valve are all provided with a strong closing structure.

[0017] As an optimized scheme, the upper and lower traveling valves and the fixed valve all comprise a valve body and a valve ball, the strong closing structure comprises a guide joint fixedly connected to the upper end of the valve ball, and a spring is vertically arranged between the upper end of the guide joint and the top of the valve body.

[0018] As an optimized scheme, a positioning protrusion is fixedly connected to the upper end of the guide joint, and the lower end of the spring is sleeved on the positioning protrusion.

[0019] As an optimized scheme, a plurality of guide ribs are circumferentially arranged on the inner wall of the valve body, and the side wall of the valve ball is frictionally abutted against the guide ribs.

[0020] Compared with the prior art, the pump barrel has the following advantages:

[0021] The pump barrel is provided with a leakage passage, so that the oil drain device is not needed, the plunger can be lowered or pulled out, the closure of the leakage passage is released, the oil can be automatically drained, the positive well washing function can be realized, the impurities in the oil pipe can be discharged from the leakage passage into the flow guide cover and discharged from the lower opening of the flow guide cover, the structure is simplified, and the working stability is improved.

[0022] The upper traveling valve, the lower traveling valve and the fixed valve are forced to reset by springs, the guide joint on the upper part of the valve ball has a weight ball function, the speed of the valve ball returning is improved, and the valve ball can be effectively righted, and the spring is located on the upper part of the guide joint, so that the normal work of the oil well pump is not affected even in the case of spring failure.

[0023] The pump adopts the cooperation form that the plunger length is greater than the pump barrel length, the plunger and the pump barrel are always in full-length cooperation during the oil pumping process, the probability of sand entering the pump barrel and the connecting pipe is reduced, sand burying the plunger can be effectively prevented when the pump is stopped, and sand entering the sealing gap between the plunger and the pump barrel and the connecting pipe can be effectively prevented during work, strong wear of sand is avoided, and the working life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0025] Fig. 1 is the structure schematic diagram of the utility model when going up;

[0026] Fig. 2 is the structure schematic diagram of the utility model when going down;

[0027] Fig. 3 is the structure schematic diagram of the utility model in the well washing state;

[0028] Fig. 4 is the structure schematic diagram of the strong close structure of the utility model.

[0029] In the drawing: 1-pump barrel; 2-connecting pipe; 3-plunger; 4-upper traveling valve; 5-lower traveling valve; 6-flow guide cover; 7-oil discharge channel; 8-upper joint; 9-intermediate joint; 10-lower joint; 11-fixed valve; 12-flow guide cavity; 13-valve ball; 14-guide joint; 15-positioning protruding part; 16-spring; 17-guide rib; 18-valve body. DETAILED DESCRIPTION

[0030] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0031] As Figs. 1 to 4As shown, the positive well washing forced reset long plunger sand prevention oil well pump comprises a pump barrel 1 and a connecting pipe 2 arranged side by side from top to bottom, a discharge passage 7 is formed on the peripheral wall of the pump barrel 1, a plunger 3 is arranged to reciprocate between the pump barrel 1 and the connecting pipe 2, the plunger 3 always seals the discharge passage 7 in the oil production state, and the upper end of the plunger 3 is lower than the discharge passage 7 in the well washing state.

[0032] In the oil production state, the lowest movement limit position of the upper end of the plunger 3 is higher than the discharge passage 7, and the highest movement limit position of the lower end of the plunger 3 is lower than the discharge passage 7, so the side wall between the upper and lower ends of the plunger 3 always seals the discharge passage 7, overcoming the problem that impurities in the oil easily block the oil discharger; and in the well washing state, the plunger 3 can be lowered to make the upper end of the plunger 3 lower than the discharge passage 7, or the plunger 3 can be lifted to make the lower end of the plunger 3 higher than the discharge passage 7, thereby unsealing the discharge passage 7.

[0033] The pump barrel 1 is coaxially sleeved with a flow guide cover 6, a flow guide cavity 12 is arranged between the inner wall of the flow guide cover 6 and the outer wall of the pump barrel 1, and the lower end of the flow guide cover 6 is arranged to be open and lower than the discharge passage 7.

[0034] The upper end of the flow guide cover 6 is fixedly connected with the upper end of the pump barrel 1 through an upper joint 8.

[0035] The upper and lower ends of the plunger 3 are correspondingly connected with an upper traveling valve 4 and a lower traveling valve 5.

[0036] An intermediate joint 9 is fixedly connected between the lower end of the pump barrel 1 and the upper end of the connecting pipe 2.

[0037] A lower joint 10 is fixedly connected to the lower end of the connecting pipe 2, and a fixed valve 11 is fixedly connected to the lower joint 10.

[0038] The upper traveling valve 4, the lower traveling valve 5 and the fixed valve 11 are all provided with a strong closing structure.

[0039] The upper traveling valve 4, the lower traveling valve 5 and the fixed valve 11 all comprise a valve body 18 and a valve ball 13, the strong closing structure comprises a guide joint 14 fixedly connected to the upper end of the valve ball 13, and a spring 16 is vertically arranged between the upper end of the guide joint 14 and the top of the valve body 18.

[0040] The upper end of the guide joint 14 is fixedly connected with a positioning protruding part 15, and the lower end of the spring 16 is sleeved on the positioning protruding part 15.

[0041] A plurality of guide ribs 17 are circumferentially arranged on the inner wall of the valve body 18, and the side wall of the valve ball 13 is in frictional abutment with the guide ribs 17.

[0042] The working principle of the device is as follows:

[0043] The pump barrel 1 is provided with an oil drain channel 7. No oil drain device is required. By lowering or raising the plunger 3, the oil drain channel 7 is released to automatically drain the oil. At the same time, the positive well flushing function can be realized. Impurities in the oil pipe can be discharged from the oil drain channel 7 into the guide cover 6 and then discharged from the lower opening of the guide cover 6, which simplifies the structure and improves the working stability.

[0044] The upper traveling valve 4, the lower traveling valve 5, and the fixed valve 11 are all forced to reset by a spring 16. The guide joint 14 above the valve ball 13 has the function of weighting the valve ball 13, increasing the return speed of the valve ball 13 and effectively straightening the valve ball 13. The spring 16 is located above the guide joint 14. Even if the spring 16 fails, it will not affect the normal operation of the oil well pump.

[0045] The pump adopts a matching form in which the length of the plunger 3 is greater than the length of the pump barrel 1, so that during the oil pumping process, the plunger 3 and the pump barrel 1 are always matched at their full length, reducing the probability of sand particles entering the pump barrel 1 and the connecting pipe 2, and effectively preventing sand from burying the plunger 3 when the pump is stopped; during operation, it can more effectively prevent sand particles from entering the sealing gap between the plunger 3 and the pump barrel 1 and the connecting pipe 2, avoiding strong wear of sand particles and improving the service life.

[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. The long plunger sand control oil well pump can be used for positive well washing and forced reset, and its characteristics are: The invention comprises a pump barrel (1) and a connecting pipe (2) arranged in parallel from top to bottom, an oil drain channel (7) is provided on the peripheral wall of the pump barrel (1), a plunger (3) is provided between the pump barrel (1) and the connecting pipe (2) so as to slide back and forth together, and the plunger (3) always closes the oil drain channel (7) in the oil production state; in the well washing state, the upper end of the plunger (3) is lower than the oil drain channel (7). The pump barrel (1) is coaxially sleeved with a flow guide cover (6), and a flow guide cavity (12) is provided between the inner wall of the flow guide cover (6) and the outer wall of the pump barrel (1). The lower end opening of the flow guide cover (6) is arranged to be lower than the oil drain channel (7). The upper end of the deflector cover (6) is fixedly connected to the upper end of the pump barrel (1) via an upper coupling (8).

2. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 1 is characterized in that: The two ends of the plunger (3) are correspondingly connected to an upper floating valve (4) and a lower floating valve (5).

3. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 2 is characterized in that: An intermediate collar (9) is fixedly connected between the lower end of the pump barrel (1) and the upper end of the connecting pipe (2).

4. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 3 is characterized in that: A lower coupling (10) is fixedly connected to the lower end of the connecting pipe (2), and a fixed valve (11) is fixedly connected to the lower coupling (10).

5. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 4 is characterized in that: The upper floating valve (4), the lower floating valve (5) and the fixed valve (11) are all provided with a strong closing structure.

6. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 5 is characterized in that: The upper floating valve (4), the lower floating valve (5) and the fixed valve (11) all include a valve body (18) and a valve ball (13). The strong closing structure includes a guide joint (14) fixed to the upper end of the valve ball (13). A spring (16) is vertically provided between the upper end of the guide joint (14) and the top of the valve body (18).

7. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 6 is characterized in that: The upper end of the guide joint (14) is fixedly connected to a positioning protrusion (15), and the lower end of the spring (16) is sleeved on the positioning protrusion (15).

8. The long plunger sand control oil well pump capable of positive well flushing and forced reset according to claim 7 is characterized in that: A plurality of guide ribs (17) are provided on the inner wall of the valve body (18) along the circumference, and the side wall of the valve ball (13) is frictionally opposed to the guide ribs (17).

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