Pump oil drainage device

Abstract

An oil drainage device under a pump is characterized in that an outer suspension joint and an inner suspension joint are connected into a whole in a hanging mode and can rotate relatively, an outer thread of a spiral joint is screwed with an inner thread of the lower portion of a lower joint of the pump, and after the inner suspension joint is arranged on the spiral joint in a sleeving mode, the upper portion of the outer suspension joint is connected with the lower portion of the lower joint; an anti-rotation groove is formed in the lower portion of the spiral connector, the anchoring device is sleeved on the inner suspension connector, the anti-rotation pin transversely penetrates through the anchoring device and the inner suspension connector, the inner end of the anti-rotation pin is inserted into the anti-rotation groove, the spiral connector and the anchoring device cannot rotate relatively and can move relatively in the axial direction through the anti-rotation pin, and an ejector rod is arranged on the upper portion of the spiral connector. The upper portion of the pump lower connector is connected with the lower portion of an oil inlet valve of the oil well pump, the ejector rod is located below a valve ball of the oil inlet valve of the oil well pump and installed below the oil well pump, no sealing part exists on the ejector rod, the leakage problem does not exist, the well descending reliability of the oil drainage device and the reliability of the oil drainage device can be improved, and long-term normal production of an oil well is guaranteed.

Description

Technical Field

[0001] The utility model is a downhole tool for oil fields. When the tubing needs to be lifted during workover operations, it is opened to connect the upper and lower parts of the sucker rod pump, so that the oil fluid in the tubing above the sucker rod pump can flow into the well. Specifically, it is a downhole drain valve below the pump. Background Art

[0002] There is an inlet valve on the sucker rod pump installed on the tubing string. The inlet valve is a check valve, and the liquid flow can only flow upward and cannot flow downward from the upper part of the inlet valve. When lifting the tubing during workover operations, the well fluid in the tubing above the pump will flow to the ground, causing environmental pollution and making the operation construction inconvenient. To solve this problem, a drain valve needs to be installed on the tubing string. Before lifting the tubing during workover operations, the drain valve is opened to connect the tubing and the casing, so that the well fluid in the tubing above the pump can flow into the casing, preventing the above problems. There are many existing drain valves, but they are all installed above the inlet valve of the sucker rod pump (such as the drain valve for lifting tubing in Chinese Patent No. 96238554.9 "A Split-Type Drain Valve for Lifting Tubing", Chinese Patent No. 00247456.5 "Drain Valve for Lifting Tubing", 2007200290118 "A Rotary Drain Valve", etc.). If such a drain valve is damaged during the downhole process, it will cause the tubing string to fail to be lowered into the well and the oil cannot be pumped out. They all have several sealing parts that bear the pressure above the pump (for example, there are two thread seals and two O-ring seals in Chinese Patent No. 2015102984917 "A Rotary Drain Valve"). Once these sealing parts are damaged, the oil well will not produce oil, shortening the production cycle of the oil well. Summary of the Invention

[0003] The purpose of the utility model is to provide a downhole drain valve below the pump, which overcomes the deficiencies of the above-mentioned various drain valves, is installed below the sucker rod pump, improves the downhole reliability of the drain valve, and improves the oil drainage reliability of the drain valve.

[0004] The purpose of the utility model is achieved as follows: It includes a lower pump joint, an outer suspension joint, an inner suspension joint, a spiral joint, an anti-rotation pin, and an anchoring device. The outer suspension joint and the inner suspension joint are hung together as a whole, and the outer suspension joint and the inner suspension joint can rotate relative to each other. The external thread of the spiral joint is screwed with the internal thread at the lower part of the lower pump joint. After the inner suspension joint is sleeved on the spiral joint, the upper part of the outer suspension joint is connected to the lower part of the lower joint. There is an anti-rotation groove at the lower part of the spiral joint. The anchoring device is sleeved on the inner suspension joint. The anti-rotation pin passes horizontally through the anchoring device and the inner suspension joint, and the inner end of the anti-rotation pin is inserted into the anti-rotation groove. The anti-rotation pin prevents the spiral joint and the anchoring device from rotating relative to each other and can move axially relative to each other. There is a push rod at the upper part of the spiral joint. The upper part of the lower pump joint is connected to the lower part of the inlet valve of the sucker rod pump, and the push rod is located below the valve ball of the inlet valve of the sucker rod pump.

[0005] The beneficial effects of the present utility model are as follows: The present utility model is installed under the oil extraction pump, with the internal and external pressures being the same. There is no need for a sealing part on it, and there is no problem of leakage occurring in the existing oil drainer installed on the pump. It can improve the downhole reliability of the oil drainer and the reliability of the oil drainer, ensure the long-term normal production of the oil well, and has significant economic and social benefits. Brief Description of the Drawings

[0006] Attached Figure 1 is the structural diagram of the present utility model. Specific Embodiments

[0007] The following will describe the embodiments of the present utility model in conjunction with the attached Figure 1 illustrate the embodiments of the present utility model.

[0008] As can be seen from Figure 1 the embodiments of the present utility model include a lower joint 1 of the pump, an outer suspension joint 2, an inner suspension joint 3, a spiral joint 4, an anti-rotation pin 5, and an anchoring device 6. The outer suspension joint 2 and the inner suspension joint 3 are hung and integrated (the inner suspension joint 3 is inside the outer suspension joint 2), and the outer suspension joint 2 and the inner suspension joint 3 can rotate relative to each other. The external thread of the spiral joint 4 is screwed with the internal thread at the lower part of the lower joint 1 of the pump. After the inner suspension joint 3 is sleeved on the spiral joint 4, the upper part of the outer suspension joint 2 is connected to the lower part of the lower joint 1. There is an anti-rotation groove 4-3 at the lower part of the spiral joint 4. The anchoring device 6 is sleeved on the inner suspension joint 3, and the anti-rotation pin 5 passes horizontally through the anchoring device 6 and the inner suspension joint 3. The inner end of the anti-rotation pin 5 is inserted into the anti-rotation groove 4-3. The anti-rotation pin 5 prevents the spiral joint 4 and the anchoring device 6 from rotating relative to each other and can move axially relative to each other. There is a push rod 4-1 at the upper part of the spiral joint 4. The upper part of the lower joint 1 of the pump is connected to the lower part of the inlet valve of the oil extraction pump, and the push rod 4-1 is located below the valve ball of the inlet valve of the oil extraction pump.

[0009] The upper hoop sleeve on the anchoring device 6 wraps the anti-rotation pin 5 to prevent the anti-rotation pin 5 from detaching from the inner suspension joint 3, the spiral joint 4, and the anchoring device 6.

[0010] The push rod 4-1 can be integrally formed with the spiral joint 4 or can be designed as two parts connected integrally. A communication hole 4-2 is provided at the lower part of the push rod 4-1.

[0011] The utility model is installed at the lower part of the sucker rod pump. In the illustrated state, the ejector rod 4-1 does not contact the inlet valve ball of the sucker rod pump, the ejector rod 4-1 will not block the oil inlet passage, and the sucker rod pump can work normally. When it is necessary to lift the tubing string of the sucker rod pump to drain oil during workover, the tubing on the ground is rotated (the connecting pipe between the sucker rod pump and the wellhead is called the tubing at the site). The anchoring device 6 is anchored on the oil well casing. The anchoring device 6 cannot rotate with the tubing above the pump, and the screw joint 4 cannot rotate either. Relative rotation occurs between the lower pump joint 1 and the screw joint 4. Under the action of the screwed threads between the lower pump joint 1 and the screw joint 4, the screw joint 4 moves upward, and the ejector rod 4-1 rises to push the valve ball of the well valve of the sucker rod pump away from the valve seat, and the upper and lower parts of the sucker rod pump are connected to realize oil drainage.

[0012] The anchoring device 6 is a prior art, and its structure is the mechanism composed of parts 2, 3, 4, 5, 14, and 15 in Chinese Patent 2015102984917 "A Rotary Oil Drainage Device".

Claims

1. A pump oil drain, comprising a pump joint (1), an external suspension joint (2), an internal suspension joint (3), a spiral joint (4), an anti-rotation pin (5), and an anchoring device (6), wherein: The outer suspension joint (2) and the inner suspension joint (3) are connected as one body, and the outer suspension joint (2) and the inner suspension joint (3) can rotate relative to each other. The outer thread of the spiral joint (4) is screwed into the inner thread of the lower part of the pump lower joint (1). After the inner suspension joint (3) is sleeved on the spiral joint (4), the upper part of the outer suspension joint (2) is connected to the lower part of the lower joint (1). The lower part of the spiral joint (4) is provided with an anti-rotation groove (4-3). The anchoring device (6) is sleeved on the inner suspension joint (3) to prevent The rotation pin (5) passes through the anchor device (6) and the inner suspension joint (3) transversely, and the inner end of the anti-rotation pin (5) is inserted into the anti-rotation groove (4-3). The anti-rotation pin (5) prevents the spiral joint (4) and the anchor device (6) from rotating relative to each other, but allows for relative axial movement. The upper part of the spiral joint (4) is provided with a push rod (4-1), and the upper part of the pump lower joint (1) is connected to the lower part of the oil inlet valve of the oil pump, and the push rod (4-1) is located below the valve ball of the oil inlet valve of the oil pump.

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