Well-washing-free jam-releasing liquid drainage pump

Abstract

A well-washing-free jam-releasing liquid drainage pump relates to the technical field of mechanical equipment and comprises an oil well pump barrel, a sucker rod and a plunger, the plunger is sleeved with the oil well pump barrel, the top end of the plunger is connected with the sucker rod, a fixed valve cover is arranged below the plunger and connected with the inner wall of the oil well pump barrel through threads, and an oil well pump fixed valve seat is arranged below the fixed valve cover. A valve ball is arranged on the oil well pump fixing valve seat; a step is arranged on the upper portion of the plunger, a liquid outlet is formed in the step, the interior of the plunger is hollow, a ball seat is arranged on the upper portion of an inner cavity of the plunger, a first sealing ball is arranged above the ball seat, and a second sealing ball is arranged above a bottom port of the plunger and located in the inner cavity of the plunger. The outer wall of the oil well pump cylinder is provided with an unfreezing drainage hole. According to the well-washing-free jam-releasing liquid drainage pump, oil drainage can be achieved whether the sucker rod and the plunger are broken or not, automatic jam releasing can be achieved under the condition that well washing is not needed, conventional well washing can be achieved at the same time, and the defects that due to well washing, an oil layer is polluted, the yield is delayed, and time and resources are wasted are overcome.

Description

Technical fields:

[0001] This utility model relates to the field of mechanical equipment technology, specifically to a no-wash well unblocking and drainage pump. Background technology:

[0002] In oilfields, short-plunger pumps are commonly used tubular pumps. To reduce the problem of sand and scale causing pump jamming, long-plunger pumps (plunger length greater than pump barrel) are used. However, the machining, concentricity, and sealing performance of long-plunger pumps are inferior to those of short-plunger pumps. Currently, some long-plunger pumps are also made into drain pumps, but the draining function is only achieved after the plunger is removed. These types of pumps cannot solve the problems of pump jamming and draining under any conditions during production, nor can they achieve the function of positive well washing. Utility model content:

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a well-free unblocking and drainage pump that can drain oil regardless of whether the sucker rod and plunger are broken or not. It can also unblock itself without well washing and can also perform positive well washing, thus avoiding the drawbacks of well washing such as oil layer pollution, production delays, and waste of time and resources.

[0004] To address the problems existing in the background technology, this utility model adopts the following technical solution: It includes an oil pump barrel, a sucker rod, and a plunger. The plunger is fitted inside the oil pump barrel, and the top of the plunger is connected to the sucker rod. A fixed valve cover is provided below the plunger, and the fixed valve cover is connected to the inner wall of the oil pump barrel via threads. A fixed valve seat for the oil pump is provided below the fixed valve cover, and a valve ball is provided on the fixed valve seat. The upper part of the plunger has a step with a liquid outlet on the step. The interior of the plunger is hollow, and a ball seat is provided at the upper part of the plunger's inner cavity. A sealing ball one is provided above the ball seat, and a sealing ball two is provided above the bottom port of the plunger, with the sealing ball two located inside the plunger's inner cavity. A release and drainage hole is provided on the outer wall of the oil pump barrel.

[0005] The number of release and drain holes is several, surrounding the circumference of the outer wall of the oil pump barrel; when the plunger falls onto the fixed valve cover, the bottom end of the release and drain hole is flush with the bottom end of the step.

[0006] The stroke length of the pumping unit is L1, and the length of the plunger is L2, with L2 being 1 meter longer than L1.

[0007] The beneficial effects of this utility model are: it can drain oil regardless of whether the sucker rod and plunger are broken or not, and it can also automatically unstick without well washing. At the same time, it can also perform forward well washing, avoiding the drawbacks of well washing such as oil layer pollution, production delay, and waste of time and resources. Attached image description:

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is an uplink state diagram of this utility model;

[0010] Figure 3 This is a diagram showing the downward state of this utility model. Detailed implementation method:

[0011] Referring to the figures, the present invention specifically adopts the following implementation method: It includes an oil pump barrel 1, a sucker rod 2, and a plunger 3. The plunger 3 is fitted inside the oil pump barrel 1, and the top of the plunger 3 is connected to the sucker rod 2. A fixed valve cover 4 is provided below the plunger 3, and the fixed valve cover 4 is connected to the inner wall of the oil pump barrel 1 by threads. An oil pump fixed valve seat 5 is provided below the fixed valve cover 4, and a valve ball 6 is provided on the oil pump fixed valve seat 5. The upper part of the plunger 3 has a step 9, and a liquid outlet is provided on the step 9. The interior of the plunger 3 is hollow, and a ball seat is provided at the upper part of the inner cavity of the plunger 3. A sealing ball 8 is provided above the ball seat, and a sealing ball 7 is provided above the bottom port of the plunger 3. The sealing ball 7 is located in the inner cavity of the plunger 3. A release and drainage hole 10 is opened on the outer wall of the oil pump barrel 1. The number of release and drain holes 10 is several, surrounding the circumference of the outer wall of the oil pump barrel 1; when the plunger 3 falls onto the fixed valve cover 4, the bottom end of the release and drain hole 10 is flush with the bottom end of the step 9. The stroke length of the pumping unit is L1, and the length of the plunger 3 is L2, where L2 is 1 meter longer than L1.

[0012] This no-wash well release pump has a dynamic fit connection (gap seal) between the plunger 3 and the inner wall of the pump barrel 1. Regardless of whether the sucker rod 2 moves up or down, the plunger 3 can block the release hole 10.

[0013] Reference Figure 2 When the sucker rod 2 moves upward, it drives the plunger 3 connected to it to move upward, the valve ball 6 opens, and the sealing ball 1 8 and sealing ball 2 7 close. The liquid at the bottom of the pump barrel 1 passes through the pump fixed valve seat 5 and fixed valve cover 4 and enters the pump barrel 1.

[0014] Reference Figure 3 When the sucker rod 2 descends, it drives the plunger 3 connected to it to descend, and the valve ball 6 falls onto the fixed valve seat 5 of the pumping unit, which is in a closed state. At this time, the sealing ball 1 8 and the sealing ball 2 7 leave the corresponding ports below and are in an open state. The liquid between the bottom of the plunger 3 and the fixed valve cover 4 will not flow downward. Instead, it pushes the sealing ball 1 8 and the sealing ball 2 7 open in sequence, enters the plunger 3, and finally flows upward through the liquid outlet opened at the step 9.

[0015] The liquid at the bottom of the oil pump barrel 1 is mainly oil, mixed with sand and scale. During the oil pumping process, the oil and sand and scale are discharged together through the sucker rod 2. Because the oil is lighter and the sand and scale are heavier, the oil floats on top and the sand and scale settles downwards, settling at step 9. As more and more oil is pumped, more and more sand and scale accumulate at step 9, which can clog the plunger 3, preventing it from moving upwards. At this point, refer to... Figure 1 Lower the plunger 3 onto the fixed valve cover 4. The release drain hole 10 is flush with the step 9. The sand and dirt accumulated on the step 9 are instantly discharged through the release drain hole 10, which plays a preliminary filtering role.

[0016] Based on the physical properties of oil, it is a viscous substance. When it flows upwards to a certain height, it easily cools down. Once cooled, it easily forms wax that adheres to the inner wall of the oil pipe, requiring well cleaning. The existing well cleaning method involves injecting water outside the pump barrel 1, entering from the bottom of the pump barrel 1, and flushing in reverse. This method requires large equipment, is cumbersome, and does not clean thoroughly. This no-clean well release and drainage pump solves this technical problem. (Refer to...) Figure 1 The plunger 3 is lowered onto the fixed valve cover 4, and the release drain hole 10 is flush with the step 9. Hot water is injected from above the oil pump barrel 1. The hot water impacts the wax block on the inner wall of the oil pipe and flows downwards, rushing out along the release drain hole 10, thus efficiently completing the well washing work.

[0017] During oil pumping, the liquid level inside the pump barrel 1 is much higher than the liquid level outside the pump barrel 1, and the liquid pressure inside the pump barrel 1 is much higher than the liquid pressure outside the pump barrel 1. When the release drain hole 10 is flush with the step 9, the inside and outside of the pump barrel 1 are connected. According to physical properties, the liquid levels inside and outside will automatically adjust to be the same. Under the liquid pressure inside the pump barrel 1, the upper liquid rushes downwards at high speed, which will also knock off the wax block on the inner wall of the oil pipe and the sand and scale deposited at the step 9. They will be discharged from the release drain hole 10 along with the liquid, completing the cleaning and filtration work.

[0018] Although the plunger 3 is sealed to the inner wall of the oil pump barrel 1, there is still a gap. A small amount of liquid will flow into the oil pump barrel 1 through the release drain hole 10 and be located in the gap, which will lubricate the plunger 3.

[0019] During the oil extraction process, a small amount of sand or mud may get into the gap between the plunger 3 and the inner wall of the oil pump barrel 1. However, as the plunger 3 moves up and down, it will also be discharged when it passes the release drain hole 10, which also has the effect of removing sand and mud.

[0020] The length L2 of the plunger 3 is increased to about one meter longer than the stroke length L1 of the well. For example, a pump with a plunger 3 of 4 meters L2 is selected for a well with a stroke length L1, and a pump with a plunger 3 of 6 meters L2 is selected for a well with a stroke length L1.

[0021] Insert the plunger 3 into the pump barrel 1. Drill N release and drainage holes 10 or mill N elongated grooves on the pump barrel 1 at the top step 9 (upper edge of the sealing section) of the plunger 3. To ensure that the tensile strength of the pump barrel 1 is not affected, a reinforcing ring or steel plate can also be welded to the outside of the pump barrel 1. After the well is aligned with the anti-surge distance, the plunger 3 will seal the holes 10 on the pump barrel 1, which will not affect oil pumping and sealing, and will also serve to remove mud, sand, scale and lubricate.

[0022] When the oil pump is working normally, the hole of the release drain hole 10 will not be exposed because the plunger 3 is longer than the well stroke.

[0023] During well production, if the sucker rod 2 fails to keep up with the pumping unit's reciprocating motion, or if pump jamming occurs due to prolonged downtime, simply lowering the plunger 3 to the bottom will expose the unblocking drainage hole 10 on the pump barrel 1. Under a pressure differential of hundreds or thousands of meters, the fluid column in the tubing will rapidly sink, pushing the dead oil at the wax-laden point to the lower part of the tubing or squeezing it out of the pump barrel 1. It will also flush sand, sludge, and other substances stuck at the top of the plunger 3 into the casing, achieving automatic unblocking. Simultaneously, it achieves forward well washing, saving resources, achieving optimal well washing results, and preventing contamination of the oil layer (for wells with severe wax buildup, the polished rod can be periodically lowered for wax removal). When pump inspection is required, regardless of whether the sucker rod 2 and plunger 3 have broken off, automatic drainage is possible, eliminating the need for additional drainage tools in the well.

[0024] In summary, this no-wash well release pump can release oil regardless of whether the sucker rod and plunger are broken or not, and can also release itself without washing the well. At the same time, it can also perform positive well washing, avoiding the drawbacks of well washing such as contaminating the oil layer, delaying production, wasting time and resources.

Claims

1. A no-wash well unblocking and drainage pump, characterized in that: The system includes a pump barrel (1), a sucker rod (2), and a plunger (3). The pump barrel (1) is fitted with a plunger (3). The top of the plunger (3) is connected to the sucker rod (2). A fixed valve cover (4) is provided below the plunger (3). The fixed valve cover (4) is connected to the inner wall of the pump barrel (1) by threads. A pump fixed valve seat (5) is provided below the fixed valve cover (4). A valve ball (6) is provided on the pump fixed valve seat (5). A step (9) is provided on the upper part of the plunger (3). A liquid outlet is provided on the step (9). The interior of the plunger (3) is hollow. A ball seat is provided on the upper part of the inner cavity of the plunger (3). A sealing ball (8) is provided above the ball seat. A sealing ball (7) is provided above the bottom port of the plunger (3). The sealing ball (7) is located in the inner cavity of the plunger (3). A release and drain hole (10) is opened on the outer wall of the pump barrel (1).

2. The no-wash well unblocking and drainage pump according to claim 1, characterized in that: The number of release drain holes (10) is several, surrounding the outer circumference of the oil pump barrel (1); when the plunger (3) falls onto the fixed valve cover (4), the bottom end of the release drain hole (10) is flush with the bottom end of the step (9).

3. The no-wash well unblocking and drainage pump according to claim 1, characterized in that: The stroke length of the pumping unit is L1, and the length of the plunger (3) is L2, with L2 being 1 meter longer than L1.

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