A deep well oil pump with interlayer sand trap pocket plunger for oil production and sand prevention

Abstract

A deep well pump for oil production and sand prevention with a sandwich sand pocket plunger belongs to the field of oil production engineering. It includes a plunger and a pump barrel; the plunger is sleeved in the pump barrel; the plunger includes a hollow sucker rod, a corrugated sand prevention hollow ring, and a floating valve; the upper part of the plunger is provided with a hollow sucker rod, and the lower part of the hollow sucker rod is connected to a number of corrugated sand prevention hollow rings distributed in the vertical direction; the floating valve is arranged at the bottom of the plunger. Beneficial effect: Due to the use of a corrugated structure, the present invention is filled with engine oil before the plunger is lowered into the pump barrel to achieve a cooling and lubricating effect. Due to the use of a large-capacity corrugated plunger, the amount of sand in the plunger is increased, which can prevent sand jams in the oil well to the maximum extent, extend the operation pump inspection cycle, reduce the number of operations, reduce the cost per ton of oil, and maximize the single-well benefit of oil well production increase; the sand jam rate of the pump and plunger is reduced to a minimum, so as to achieve the purpose of high and stable production of oil wells.

Description

Technical Field

[0001] The invention relates to an oil production and sand prevention deep well pump with an interlayer sand settling pocket type plunger, belonging to the field of oil production engineering. Background Art

[0002] Sand production in oil wells is an important factor affecting the normal production of oil wells. For wells with serious sand production, sand prevention measures need to be adopted. Using oil pumps with sand prevention and sand settling functions is a common sand prevention measure. At present, most of the oil pumps used in oil fields are conventional sand settling pumps or simple structure double-body pumps, but none of them solve the problem of sand capacity between the plunger and the pump barrel. Summary of the invention

[0003] In order to increase the sand holding capacity of the oil pump, the present invention provides the following solution: an oil production and sand prevention deep well oil pump with a sandwich sand trap pocket plunger, comprising a plunger and a pump barrel; the plunger is sleeved in the pump barrel;

[0004] The plunger comprises a hollow sucker rod, a corrugated sand-proof hollow ring and a movable valve; a hollow sucker rod is arranged on the upper part of the plunger, and a plurality of corrugated sand-proof hollow rings distributed in the vertical direction are connected to the lower part of the hollow sucker rod; the movable valve is arranged at the bottom of the plunger.

[0005] Furthermore, a floating valve cover is provided at the bottom of the plunger, and the floating valve cover is located on the upper part of the floating valve.

[0006] Furthermore, a fixed valve is provided at the bottom of the pump barrel, and a fixed valve cover is provided above the fixed valve.

[0007] Furthermore, several adjacent corrugated sand-control hollow rings are internally welded intermittently; several adjacent corrugated sand-control hollow rings are externally welded fully; and several adjacent corrugated sand-control hollow rings form a corrugated sand-control groove.

[0008] Furthermore, the adjacent corrugated sand-control hollow rings form sand-setting openings inside.

[0009] Furthermore, a plurality of sand trapping bags are arranged in the corrugated sand-proof hollow ring.

[0010] Furthermore, the plunger is filled with engine oil before being lowered into the pump barrel.

[0011] Furthermore, the bottom of the corrugated sand-proof hollow ring is sealed.

[0012] Beneficial effects: Due to the corrugated structure adopted in the present invention, the engine oil is filled before the plunger is lowered into the pump barrel, thereby achieving the cooling and lubricating effect. Due to the large-capacity corrugated plunger, the amount of sand in the plunger is increased, which can prevent sand jam in the oil well to the greatest extent, extend the operation pump inspection cycle, reduce the number of operations, reduce the cost per ton of oil, and maximize the single well benefit by increasing oil well production; the sand jam rate of the pump and plunger is reduced to a minimum, thereby achieving the goal of high and stable production of oil wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of a deep well oil pump with an interlayer sand-settling pocket plunger for oil production and sand prevention;

[0014] Figure 2 It is a schematic diagram of the plunger structure of the oil well pump;

[0015] Figure 3 That is, AA is a cross-sectional view of the corrugated sand-control hollow ring.

[0016] Explanation of the serial numbers in the figure: 1. Plunger; 2. Pump barrel; 3. Fixed valve cover; 4. Fixed valve; 5. Hollow sucker rod; 6. Corrugated hollow ring for sand prevention; 7. Floating valve cover; 8. Floating valve; 9. Sand settling bag; 10. Sand settling port. DETAILED DESCRIPTION

[0017] The following is combined with Figures 1 to 3 The present invention is further described in detail with specific embodiments: This application is further described with this example.

[0018] Example 1

[0019] like Figures 1 to 3 As shown, this embodiment provides an oil production and sand control deep well oil pump with a sandwich sand trap pocket type plunger, comprising a plunger 1 and a pump barrel 2; the plunger 1 is sleeved in the pump barrel 2;

[0020] The plunger 1 includes a hollow sucker rod 5, a corrugated hollow sand-proof ring 6, and a movable valve 8; a hollow sucker rod 5 is provided on the upper part of the plunger 1, and a plurality of corrugated hollow sand-proof rings 6 distributed in the vertical direction are connected to the lower part of the hollow sucker rod; the movable valve 8 is arranged at the bottom of the plunger 1.

[0021] A floating valve cover 7 is provided at the bottom of the plunger 1 , and the floating valve cover 7 is located on the upper part of the floating valve 8 .

[0022] A fixed valve 4 is provided at the bottom of the pump barrel 2 , and a fixed valve cover 3 is provided above the fixed valve 4 .

[0023] The interiors of several adjacent corrugated sand-control hollow rings 6 are intermittently welded; the exteriors of several adjacent corrugated sand-control hollow rings 6 are fully welded; and several adjacent corrugated sand-control hollow rings 6 form a corrugated sand-control groove.

[0024] The adjacent corrugated sand-proof hollow rings form a sand settling port 10 inside.

[0025] A plurality of sand trapping bags 9 are arranged in the corrugated sand prevention hollow ring 6 .

[0026] The plunger 1 is filled with engine oil before being lowered into the pump barrel 2.

[0027] The bottom of the corrugated sand-proof hollow ring 6 is sealed.

[0028] During operation, the working pump barrel 2 of the oil well pump is connected to the upper oil pipe and lowered into the well to the designed depth. The plunger 1 is connected to the upper hollow sucker rod 5, and is lowered from the oil pipe directly into the pump barrel 2, and enters the pump barrel 2 to cooperate with the pump barrel 2 to complete the suction work. When the oil well is opened, the plunger 1 moves up and down with the upper sucker rod, generating displacement, realizing the alternating opening and closing of the floating valve 8 and the fixed valve 4, and lifting the crude oil to the ground.

[0029] During the upstroke, the floating valve 8 is closed, the fixed valve 4 is opened, and the formation crude oil enters the pump barrel 2. At this time, the pressure in the pump barrel 2 increases. During the downstroke, the fixed valve 4 is closed under the action of the gravity of the liquid column in the pump barrel 2, and the pressure in the pump barrel 2 continues to increase, thereby pushing open the floating valve 8, and the oil in the pump barrel 2 enters the oil pipe. Through continuous reciprocating work, the formation crude oil is lifted to the ground. If the oil well has sand production at this time, a small amount of sand contained in the liquid in the well will accumulate in the sand prevention groove, and the annular sand prevention groove of the ordinary oil pump has limited space and can only store a small amount of accumulated sand. Once the amount of accumulated sand is too much, it will cause a pump jam accident, affecting the normal production of the oil well. The oil pump of this design adopts a corrugated sand prevention groove, which has a much larger capacity than the annular sand prevention groove of the ordinary oil pump, and can hold more accumulated sand in the liquid, thereby achieving a sand prevention effect. As the amount of sand accumulated in the produced fluid increases, the sand deposited in the corrugated sand control groove will further enter the interlayer space of the interlayer plunger, i.e., the sand settling bag 9, through the sand settling port 10, thereby providing a larger sand storage space for the deposition of sand particles in the oil well produced fluid. Thus, through the secondary sand storage, the sand is effectively deposited, the probability of sand stuck in the oil well is greatly reduced, and the sand control effect of the deep well pump is improved.

[0030] In the past, the plunger and the pump barrel of the oil pump carried a certain amount of sand, which intensified the friction between the plunger and the pump barrel, thereby generating a large amount of heat. Most of the tiny space between the plunger and the pump barrel was occupied by the accumulated sand, which could not play a lubricating role, and could not take away the generated heat in time, causing the plunger and the pump barrel to expand due to heat. When it reached a certain degree, it would cause the pump to get stuck, which would cause the oil well to stop production, check the pump, increase production costs, and reduce production time. The corrugated sand-proof groove not only increases the space for sand, but also increases the heat dissipation area of ​​the plunger 1, which can take away the generated heat in time; in addition to being able to hold a certain amount of sand, the sand bag 9 can also enter a part of the well fluid. When the friction between the plunger 1 and the pump barrel 2 is intensified due to sand discharge, the generated heat can be immediately replaced, thereby effectively reducing the temperature of the plunger 1 and the pump barrel 2, thereby reducing the pump jam caused by internal expansion of the deep well pump.

[0031] In the past, deep well pumps produced oil, except for a few oil layer collapses and large amounts of sand. Most of the sand jams were caused by pump jams due to shutdown and restarting when the pump failed, power outages or normal maintenance. In other words, after the oil well was shut down, the sand carried by the produced fluid to the pump barrel or tubing during production exceeded the volume of the plunger's annular sand prevention groove, which is very likely to cause pump jams. The design of the oil production and sand prevention deep well pump with a sandwich sand pocket plunger greatly increases the sand holding space from the pump itself. It is mainly aimed at the relatively large amount of sand produced and sand settled in the previous oil pump during the suction process, which easily aggravates the friction between the plunger and the pump barrel, and the small sand holding space, resulting in sand jams, increasing the failure of sand-producing wells, reducing the production time rate of sand-producing oil wells, increasing the cost of oil well repairs, and affecting production efficiency. Through the design of corrugated sand control grooves and interlayer pockets, the sand storage space and cooling effect of the oil pump are greatly increased, thereby extending the production time and pump inspection cycle of sand-producing oil wells, reducing maintenance operation costs, and achieving enhanced sand control production effects.

[0032] The above contents are further detailed descriptions of the present invention in combination with specific preferred technical solutions, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection of the present invention.

Claims

1. A deep well oil pump for oil production and sand prevention with a sandwich sand pocket plunger, characterized in that: It comprises a plunger (1) and a pump barrel (2); the plunger (1) is sleeved in the pump barrel (2); The plunger (1) comprises a hollow sucker rod (5), a corrugated sand-proof hollow ring (6), and a movable valve (8); a hollow sucker rod (5) is arranged on the upper part of the plunger (1), and a plurality of corrugated sand-proof hollow rings (6) distributed in a vertical direction are connected to the lower part of the hollow sucker rod; the movable valve (8) is arranged at the bottom of the plunger (1); the upper and lower end surfaces of the corrugated sand-proof hollow ring (6) are corrugated; the interiors of a plurality of adjacent corrugated sand-proof hollow rings (6) are intermittently welded; the exteriors of a plurality of adjacent corrugated sand-proof hollow rings (6) are fully welded; a plurality of adjacent corrugated sand-proof hollow rings (6) constitute a corrugated sand-proof groove; the interiors of the adjacent corrugated sand-proof hollow rings (6) constitute a sand-setting port (10); a plurality of sand-setting bags (9) are arranged in the corrugated sand-proof hollow ring (6).

2. According to the deep well oil pump for oil production and sand prevention with a sandwich sand pocket plunger as described in claim 1, a floating valve cover (7) is provided at the bottom of the plunger (1), and the floating valve cover (7) is located on the upper part of the floating valve (8).

3. According to the deep well oil pump for oil production and sand prevention with a sandwich sand pocket plunger as described in claim 1, a fixed valve (4) is provided at the bottom of the pump barrel (2), and a fixed valve cover (3) is provided above the fixed valve (4).

4. According to the deep well oil pump for oil production and sand prevention with a sandwich sand pocket plunger as described in claim 1, the plunger (1) is filled with engine oil before being lowered into the pump barrel (2).

5. According to the deep well oil pump for oil production and sand control with a sandwich sand trap pocket plunger as described in claim 1, the bottom of the corrugated sand control hollow ring (6) is sealed.

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