Oil drainage device of oil well pump and oil well pump

Abstract

The utility model relates to the technical field of oil drainage devices in oil fields, in particular to an oil well pump oil drainage device and an oil well pump. The oil drainage device of the oil well pump comprises an oil drainage device body and a shear pin, a connecting hole is formed in the oil drainage device body, the shear pin is provided with a connecting section and a front cutting section, the connecting section is installed in the connecting hole, the shear section extends into an oil liquid channel, and an oil drainage hole of a blind hole structure is formed in the shear pin. An opening of the oil drainage hole is located in the outer end face of the shear pin, the tail of the oil drainage hole is located on the shear section, a shear ring is installed at the upper end of the oil channel in the oil drainage device body in a threaded mode, and an inner hole of the shear ring is communicated with the oil channel and provided with a rotation stopping hole section matched with a piston of an oil well pump. The rotation stopping hole section is used for being matched with a rotation stopping head at the bottom of the piston and enabling the shearing ring to be tripped through forward rotation. According to the utility model, the screw thread type shearing ring is designed, and the sucker rod and the piston are used for releasing and draining oil, so that the problems of crude oil waste, environment pollution and the like caused by pulling out the sucker rod are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drainers in oil fields, in particular to an oil drain device for an oil pump and an oil pump. Background Art

[0002] At present, in order to prevent crude oil from falling to the ground when the oil pipe is pulled out, polluting the environment and wasting resources, an oil drainer is usually installed between the oil pump and the fixed valve during oil well repair operations. During oil well repair operations, the crude oil in the oil pipe is first drained.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN218030577U discloses a multi-stage oil stop drain. Specifically, the oil drain includes an oil drain body, which is a pipe column structure, and a drain pin mounting hole that penetrates its wall thickness is opened on the side wall. One end of the drain pin is installed in the drain pin mounting hole through a thread, and the other end extends to the oil channel in the oil drain body. The end of the drain pin installed in the drain pin mounting hole is the mounting section, and the end extending to the oil channel is the overhang section. The drain pin is provided with a blind hole structure of the drain hole, and the orifice of the drain hole is located on the outer end face of the drain pin, and the bottom of the hole is located on the overhang section. When in use, the drain is installed between the oil pump and the fixed valve, and is lowered into the oil well with the oil pipe. When the well needs to be repaired, after the sucker rod and the piston of the oil pump are taken out, a striker rod is inserted into the oil pipe, and the striker rod strikes the drain pin under the action of acceleration gravity to cut it off, exposing the drain hole to drain oil.

[0004] However, this method requires that the sucker rod and the piston be removed before the oil is drained. Before removal, the sucker rod and the piston are in the oil, and the viscous crude oil will be brought out with the sucker rod, which will also cause the crude oil to fall to the ground, polluting the environment, wasting resources and posing a safety hazard. Utility Model Content

[0005] The purpose of the utility model is to provide an oil drain device for an oil pump, so as to solve the technical problem in the prior art that the sucker rod needs to be pulled out before oil draining, causing crude oil to fall to the ground, resulting in environmental pollution, waste of resources and potential safety hazards; at the same time, the purpose of the utility model is also to provide an oil pump using the above-mentioned oil drain device for an oil pump.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the oil drain device of an oil pump provided by the utility model is:

[0007] An oil drain device for a sucker rod pump, comprising an oil drainer body and a shear pin. A connection hole penetrating the wall thickness is formed in the oil drainer body. The shear pin has a connection section and a front cutting section. The connection section is threadedly installed in the connection hole, and the cutting section extends into the oil passage in the oil drainer body. A blind-hole-structured oil drain hole is formed in the shear pin, with the hole opening located at the outer end face of the shear pin and the hole tail located on the cutting section of the shear pin. A shear ring is threadedly installed at the upper end of the oil passage in the oil drainer body. The inner hole of the shear ring communicates with the oil passage and has a non-rotating hole section that cooperates with the piston of the sucker rod pump. The non-rotating hole section is used to cooperate with the non-rotating head at the bottom of the piston and rotate in the positive direction to disengage the shear ring.

[0008] Beneficial effects: The oil drain device for a sucker rod pump of the present invention belongs to an improvement of the existing oil drainer. The shear ring is designed as a threaded structure and can be detachably installed on the inner wall of the oil drainer body through threads. When draining oil, the piston is driven to move downward by the sucker rod, so that the non-rotating head of the piston and the non-rotating hole of the shear ring are non-rotatingly engaged. Rotating the sucker rod in the positive direction causes the sucker rod to drive the piston and the shear ring to rotate in the positive direction and disengage. After disengagement, it strikes the cutting section of the shear pin extending into the oil passage downward. Since both the cutting section of the shear pin and the shear ring are located in the oil passage, the shear pin can be accurately and effectively struck to expose the oil drain hole for oil drainage. Before draining oil through the oil drain device of the present invention, it is not necessary to lift out the sucker rod and the piston, thus effectively avoiding the problems of crude oil falling to the ground, causing environmental pollution, resource waste and safety hazards.

[0009] Further, a supporting and positioning surface is formed on the upper end surface of the non-rotating hole section for supporting and positioning the piston during normal operation.

[0010] Further, the cross-section of the non-rotating hole section is a kidney-shaped hole.

[0011] Further, the outer diameter of the shear ring is smaller than the diameter of the oil passage of the oil drainer body.

[0012] Further, the length of the cutting section of the shear pin extending into the oil passage is greater than the radius of the oil passage of the oil drainer body.

[0013] To achieve the above object, the technical solution of a sucker rod pump provided by the present invention is:

[0014] A sucker rod pump includes a pump barrel and a fixed valve. A piston is arranged inside the pump barrel. The bottom of the piston is a square head. A pump joint is provided at the bottom of the pump barrel. The oil discharging device of the sucker rod pump is installed between the pump joint and the fixed valve by means of threads. The oil discharging device of the sucker rod pump includes an oil discharging body and a shear pin. A connecting hole penetrating through the wall thickness is formed on the oil discharging body. The shear pin has a connecting section and a front cutting section. The connecting section is installed in the connecting hole by means of threads. The cutting section extends into the oil passage inside the oil discharging body. An oil discharging hole with a blind hole structure is formed in the shear pin. The orifice of the oil discharging hole is located at the outer end face of the shear pin, and the hole tail is located on the cutting section of the shear pin. A shear ring is installed at the upper end of the oil passage inside the oil discharging body by means of threads. The inner hole of the shear ring is communicated with the oil passage and has a non-rotating hole section that cooperates with the piston of the sucker rod pump. The non-rotating hole section is used to cooperate with the non-rotating head at the bottom of the piston and rotate in the positive direction to disengage the shear ring.

[0015] Beneficial effects: The sucker rod pump of the present utility model belongs to an improvement of the existing sucker rod pump. Specifically, the bottom of the piston of the sucker rod pump is designed as a non-rotating head that cooperates with the shear ring. The pump joint of the sucker rod pump is connected to the oil discharging device of the sucker rod pump, and the bottom of the oil discharging device of the sucker rod pump is connected to the fixed valve. During oilfield operations, the oil discharging device of the sucker rod pump is lowered into the well together with the sucker rod pump and the tubing for operation. When workover is required, the oil discharging operation is first carried out through the oil discharging device of the sucker rod pump. Specifically, the sucker rod drives the piston to move downward and cooperate with the shear ring for non-rotation. By rotating the sucker rod in the positive direction, the shear ring is disengaged from the oil discharging body. After disengagement, the shear ring enters the oil passage and impacts the cutting section of the shear pin that extends in the oil passage, causing the shear pin to be cut off and exposing the oil discharging hole for oil discharge, thus avoiding the technical problem of crude oil falling to the ground caused by pulling out the sucker rod before oil discharge.

[0016] Further, a bearing and positioning surface is formed on the upper end surface of the non-rotating hole section for bearing and positioning the piston during normal operation.

[0017] Further, the cross-section of the non-rotating hole section is a kidney-shaped hole.

[0018] Further, the outer diameter of the shear ring is smaller than the diameter of the oil passage of the oil discharging body.

[0019] Further, the length of the cutting section of the shear pin extending into the oil passage is greater than the radius of the oil passage of the oil discharging body. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the oil discharging device of a sucker rod pump of the present utility model in a connected state with the sucker rod pump;

[0021] Figure 2 It is a top view of the shear ring in the oil discharging device of a sucker rod pump of the present utility model;

[0022] Figure 3This is the front view of the shear ring in an oil drain device of a sucker rod pump of the present utility model.

[0023] In the figure: 1. Oil drainer body; 2. Shear ring; 21. Cylindrical hole; 22. Anti-rotation hole; 3. Shear pin; 4. Piston; 5. Pump barrel; 6. Pump joint; 7. Oil passage; 8. Anti-rotation head. Specific embodiments

[0024] The features and performance of the present utility model will be further described in detail below in conjunction with embodiments.

[0025] In the prior art, before the oil drainer drains oil, the sucker rod needs to be lifted out first, and then an impact rod is put into the tubing. The oil drain pin is broken by the impact rod to expose the oil drain hole for oil drainage. However, before the sucker rod is lifted out, the sucker rod is in the crude oil. When it is lifted out, the viscous crude oil is carried out with the sucker rod, resulting in the crude oil falling to the ground, causing problems such as environmental pollution, resource waste and safety hazards. At this time, it is necessary to perform an oil drainage operation before lifting out the sucker rod.

[0026] Therefore, this application provides an improved oil drain device for a sucker rod pump. Its main idea is: the step for supporting and positioning the piston in the existing oil drainer is designed as a threaded shear ring, which is fixed in the oil drainer body during normal operation for supporting and positioning the piston; when well workover is required, it cooperates with the piston and disengages from the oil drainer, and shears the oil drain pin downward to expose the oil drain hole for oil drainage.

[0027] Based on the above idea, the basic technical solution of the present utility model is: a shear ring is threadedly installed at the upper end of the oil passage in the oil drainer body. The inner hole of the shear ring is communicated with the oil passage and has an anti-rotation hole section that cooperates with the piston of the sucker rod pump. The anti-rotation hole section is used to cooperate with the anti-rotation head at the bottom of the piston and rotate forward to disengage the shear ring.

[0028] The following will be described through different embodiments:

[0029] An oil drain device for a sucker rod pump, such as Figure 1As shown, it includes an oil drainer body 1, which is cylindrical and has a connecting hole that penetrates its wall thickness. A shear pin 3 is threadedly installed in the connecting hole, and the other end of the shear pin 3 is cantilevered into the oil channel 7 of the oil drainer body 1. The end of the shear pin 3 installed in the connecting hole is a connecting section, and the end extending into the oil channel 7 is a shear section. An oil drain hole is opened in the shear pin 3, and the oil drain hole is a hexagonal blind hole structure. The orifice of the oil drain hole is located on the outer end face of the shear pin, and the tail of the hole is located on the shear section of the shear pin; in order to facilitate shearing, a V-groove structure can be designed on the shear section, and a stop pin with an avoidance hole structure can be designed at the outer end face of the shear pin 3 in the connecting hole, so that the oil drain device of the pump will not fall off prematurely due to severe vibration when it enters the well together with the pump, causing oil pumping failure. The upper end of the oil channel 7 in the oil drain body 1 is threadedly installed with a shear ring 2. The shear ring 2 is designed to be detachable by thread, which is conducive to using the sucker rod and the piston to disengage the shear ring 2. The inner hole of the shear ring 2 is connected to the oil channel 7. When performing oil field operations, the oil drain device of the utility model is connected to the lower end of the oil pump, and the upper end of the oil pump is connected to the oil pipe. The oil drain device of the oil pump is lowered into the well together with the oil pipe and the oil pump for operation, which is conducive to the oil entering the oil pipe through the oil channel 7 and the inner hole of the shear ring 2 under the action of the oil pump to achieve the effect of pumping oil. It also has a stop hole section that cooperates with the piston 4 of the oil pump. The stop hole section is used to cooperate with the stop head 8 at the bottom of the piston and rotate in the forward direction to disengage the shear ring 2, hit the shear pin 3, and expose the oil drain hole to drain oil. In the above embodiment, the shear ring 2 is installed on the oil drain body 1 by threading. When oil drainage is not required, it is fixedly connected to the oil drain body 1 and used to support and position the piston 4 when pumping oil. When oil drainage is not required, it is fixed on the oil drain body 1 and is on standby. When well repair is required, the piston 4 is driven downward by the sucker rod, so that the anti-rotation head of the piston 4 is anti-rotationally matched with the anti-rotation hole 22 of the shear ring 2, and the sucker rod is rotated forward so that the sucker rod drives the piston 4 and the shear ring 2 to rotate forward and disengage. The disengaged shear ring 2 strikes downward against the shear pin 3 extending into the oil channel 7, so that the shear section of the shear pin 3 is cut off and falls into the ball seat below, exposing the oil drain hole to drain oil. It is not necessary to pull out the sucker rod before draining oil through the above-mentioned oil pump oil drainage device, which avoids the sucker rod bringing out crude oil, causing environmental pollution, waste of resources and safety hazards.

[0030] In one embodiment, the inner hole of the shear ring 2 forms a stop hole 22, and the upper end surface of the shear ring 2 forms a supporting and positioning surface, which is used to support the piston 4 and position the piston 4 during normal pumping operation. This structure can also achieve the stop fit between the corresponding piston 4 and the shear ring 2, thereby achieving the purpose of not having to pull out the sucker rod before oil leakage. In another embodiment, Figure 2 and Figure 3As shown, the inner hole of the shear ring 2 has a rotation - stopping hole section at the lower end and a cylindrical hole section at the upper end. The stepped surface formed between the rotation - stopping hole 22 and the cylindrical hole 21 is the supporting positioning surface. The diameter of the cylindrical hole 21 is not less than the maximum diameter of the piston 4. Through this structure, the corresponding functions can also be achieved.

[0031] In one embodiment, the rotation - stopping hole 22 is designed as a polygonal hole, and the purpose of positive - rotation tripping can also be achieved through the rotation - stopping cooperation between the polygonal hole and the piston. The present application provides a more optimal embodiment. For example, Figure 2 As shown, the cross - section of the rotation - stopping hole section is designed as a kidney - shaped hole. Through this structure, it is simple, easy to process, and can achieve the corresponding rotation - stopping cooperation function.

[0032] The present application provides a more optimal embodiment. The outer - circle diameter of the shear ring 2 is smaller than the diameter of the oil - fluid passage 7 of the oil - drainer body 1, which is convenient for the shear ring 2 to smoothly impact the shear pin 3 after positive - rotation tripping, so that the shear pin 3 is cut off to expose the oil - drain hole for oil drainage.

[0033] The present application provides a more optimal embodiment. The length of the shear section of the shear pin 3 extending into the oil - fluid passage 7 of the oil - drainer body 1 is greater than the radius of the oil - fluid passage 7 of the oil - drainer body 1. By setting the length of the shear section of the shear pin 3 to be greater than the radius of the oil - fluid passage 7, it is convenient for the shear ring 2 to accurately and effectively cut it off to achieve the purpose of oil drainage.

[0034] The present utility model provides another technical solution. The above - mentioned oil - drain device of the oil - extraction pump is applied to the oil - extraction pump. For example, Figure 1 As shown, the oil - extraction pump includes a pump barrel 5 and a fixed valve. A piston 4 is arranged in the pump barrel 5, and the bottom of the piston 4 is a rotation - stopping head 8. The oil - drain device of the oil - extraction pump is connected to the oil - extraction pump through a pump joint 6, and the other end is connected to the fixed valve by thread. During oil extraction, the oil - drain device of the oil - extraction pump is lowered into the well together with the oil - extraction pump and the oil pipe for oil - extraction operation. When well repair is needed, the sucker rod drives the piston 4 to move downward, so that the rotation - stopping head 8 at the bottom of the piston 4 and the rotation - stopping hole 22 at the bottom of the shear ring 2 are in rotation - stopping cooperation. By rotating the sucker rod forward, the shear ring 2 is disengaged from the inner wall of the oil - drainer body 1. After disengagement, the shear ring 2 enters the oil - fluid passage 7 of the oil - drainer body 1, breaks the shear section of the shear pin 3, and exposes the oil - drain hole for oil drainage. During this process, it is not necessary to lift out the sucker rod, thus avoiding problems such as the sucker rod taking out crude oil when lifted out, causing resource waste, environmental pollution, and potential safety hazards.

[0035] The above - mentioned are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. The patent protection scope of the present utility model is subject to the claims. All equivalent structural changes made by using the description and drawings of the present utility model should be included in the protection scope of the present utility model by the same token.

Claims

1. An oil drain device for an oil pump, comprising an oil drain body and a shear pin, wherein the oil drain body is provided with a connecting hole penetrating through the wall thickness thereof, the shear pin has a connecting section and a front cutting section, the connecting section is threadedly installed in the connecting hole, the shear section extends into the oil channel in the oil drain body, an oil drain hole of a blind hole structure is provided in the shear pin, the orifice of the oil drain hole is located on the outer end surface of the shear pin, and the tail of the hole is located on the shear section of the shear pin; wherein the oil drain hole is provided with a blind hole structure ... provided with a blind hole structure, the orifice of the oil drain hole is located on the outer end surface of the shear pin, and the tail of the hole is located on the shear section of the shear pin; wherein the oil drain hole is provided with a blind hole structure, the orifice of the oil drain hole is provided with a blind hole structure, the orifice of the oil drain hole is provided with a blind hole structure, the tail of the hole is located on the shear section of the shear pin; wherein the oil drain hole is provided with a blind hole structure, the orifice of the oil drain hole is provided with a blind hole structure, the tail of the hole is located on the shear section of the shear pin; A shear ring is threadedly installed on the upper end of the oil channel in the oil drain body. The inner hole of the shear ring is connected to the oil channel and has a stop hole section that cooperates with the piston of the oil pump. The stop hole section is used to cooperate with the stop head at the bottom of the piston and disengage the shear ring by positive rotation.

2. The oil drain device of the oil pump according to claim 1, characterized in that: The upper end surface of the anti-rotation hole section forms a supporting and positioning surface, which is used for supporting and positioning the piston during normal operation.

3. The oil drain device of the oil pump according to claim 2, characterized in that: The cross section of the anti-rotation hole section is a waist-shaped hole.

4. The oil drain device of the oil pump according to any one of claims 1 to 3, characterized in that: The outer diameter of the shear ring is smaller than the diameter of the oil channel of the oil drainer body.

5. The oil drain device of the oil pump according to claim 1, characterized in that: The length of the shearing section of the shearing pin extending into the oil passage is greater than the radius of the oil passage of the oil drainer body.

6. An oil pump, comprising a pump barrel and a fixed valve, a piston is arranged in the pump barrel, the bottom of the piston is a square head, a pump joint is arranged at the bottom of the pump barrel, an oil drain device of the oil pump is installed between the pump joint and the fixed valve by means of threads, the oil drain device of the oil pump comprises an oil drain body and a shear pin, a connecting hole penetrating through the wall thickness of the oil drain body is provided on the oil drain body, the shear pin has a connecting section and a front cutting section, the connecting section is threadedly installed in the connecting hole, the shear section extends to the oil channel in the oil drain body, an oil drain hole of a blind hole structure is provided in the shear pin, the orifice of the oil drain hole is located on the outer end face of the shear pin, and the tail of the hole is located on the shear section of the shear pin; the characteristic is that, A shear ring is threadedly installed on the upper end of the oil channel in the oil drain body. The inner hole of the shear ring is connected to the oil channel and has a stop hole section that cooperates with the piston of the oil pump. The stop hole section is used to cooperate with the stop head at the bottom of the piston and disengage the shear ring by positive rotation.

7. The oil well pump according to claim 6, characterized in that: The upper end surface of the anti-rotation hole section forms a supporting and positioning surface, which is used for supporting and positioning the piston during normal operation.

8. The oil well pump according to claim 7, characterized in that: The cross section of the anti-rotation hole section is a waist-shaped hole.

9. The oil well pump according to any one of claims 6 to 8, characterized in that: The outer diameter of the shear ring is smaller than the diameter of the oil channel of the oil drainer body.

10. The oil well pump according to claim 6, characterized in that: The length of the shearing section of the shearing pin extending into the oil passage is greater than the radius of the oil passage of the oil drainer body.

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