Gas-proof feedback oil well pump

Abstract

A liquid discharge valve and a liquid inlet valve are one-way valves, the pump diameter of an upper pump cylinder is smaller than that of a lower pump cylinder, the length of an upper piston is larger than that of the upper pump cylinder, a rod connector, the upper piston, the liquid discharge valve, an inter-valve connector, the liquid inlet valve and the lower piston are sequentially connected, and the interior of the upper piston is communicated with the outside through a discharge channel arranged on the rod connector or the upper piston. The upper piston penetrates through the upper pump cylinder, the pump cylinder connector and the lower pump cylinder to be sleeved outside the lower piston, the upper pump cylinder, the pump cylinder connector and the lower pump cylinder are sequentially connected, a pump cavity is formed between the outer wall of the upper piston and the inner wall of the lower pump cylinder due to the diameter difference between the upper piston and the lower pump cylinder, a communicating groove is formed in the inter-valve connector, and a gas transfer groove is formed in the upper piston. The length of the gas transfer groove is smaller than that of the upper pump cylinder. Gas gathered on the upper portion of the pump cavity can be transferred to the pump when the upper piston moves upwards, the influence of the gas on work of the feedback oil well pump with the upper pump diameter smaller than the lower pump diameter is eliminated, the oil well yield can be improved, and remarkable economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the oil pumping pump of oil field pumping belongs to a kind of anti-gas feedback oil pumping pump. BACKGROUND

[0002] The oil pumping pump in the 106th page of the oil pumping pump published by Petroleum Industry Press in July 1994 is a kind of hydraulic feedback oil pumping pump. It is composed of two pump barrels with different diameters and two plungers matched with them and other accessories. When the sucker rod goes down, a downward force is generated under the action of the area difference of the two plungers and the pressure difference of oil inlet and outlet, which is called feedback force. Therefore, this oil pumping pump is called feedback oil pumping pump, and the downward feedback force can help the sucker rod to go down, which is beneficial to the work in thick oil. Therefore, it is also called thick oil pump. According to the principle of the feedback oil pumping pump published in the 106th page of the oil pumping pump published by Petroleum Industry Press in July 1994, the skilled person in the art has designed many kinds of feedback oil pumping pumps for matching with special oil pumping pumps. One of the feedback oil pumping pumps is that the upper pump barrel is small and the lower pump barrel is large. In this type of feedback oil pumping pump, fluid is discharged from the lower part of the pump cavity, and gas is gathered in the upper part of the pump cavity due to the density difference. Therefore, it is difficult to discharge gas when pumping oil, which may cause the problems of gas affecting pump efficiency and gas locking, resulting in low oil well production or even no oil, and causing significant economic losses. SUMMARY

[0003] The utility model aims at providing a kind of anti-gas feedback oil pumping pump, solve the pump efficiency reduction and gas locking problem caused by gas gathering in the upper part of pump cavity in the oil well with higher gas content in the existing upper pump diameter smaller than lower pump diameter this kind of feedback oil pumping pump, improve the economic benefit of oil well.

[0004] The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps.

[0005] The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps. IMPLEMENTATION

[0007] The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps. Figure 1 The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps.

[0008] The utility model discloses a pump structure and a method for improving the pump efficiency of a feedback type oil well pump, and belongs to the technical field of oil well pumps. Figure 1It can be known that the embodiment of the utility model includes rod joint 1, upper pump cylinder 2, upper piston 3, pump cylinder joint 4, liquid discharge valve 5, valve interconnection 6, liquid inlet valve 7, lower pump cylinder 8, lower piston 9, liquid discharge valve 5, liquid inlet valve 7 are check valve, well fluid can only flow from lower to upper by liquid discharge valve 5, liquid inlet valve 7, cannot flow from upper to lower, the pump diameter of upper pump cylinder 2 is less than the pump diameter of lower pump cylinder 8, the length of upper piston 3 is greater than the length of upper pump cylinder 2, rod joint 1, upper piston 3, liquid discharge valve 5, valve interconnection 6, liquid inlet valve 7, lower piston 9 are connected in proper order, the inside of upper piston 3 is communicated with the outside through the discharge channel 3-1 set on rod joint 1 or upper piston 3 (the discharge channel 3-1 can be set on rod joint 1, also can be set on the upper portion of upper piston 3), upper piston 3 passes through upper pump cylinder 2, pump cylinder joint 4, lower pump cylinder 8 is sleeved on lower piston 9, upper pump cylinder 2, pump cylinder joint 4, lower pump cylinder 8 are connected in proper order, upper piston 3 is sealed with upper pump cylinder 2, lower piston 9 is sealed with lower pump cylinder 8, the inner wall of upper piston 3 and the inner wall of lower pump cylinder 8 form pump cavity 8-1 due to the diameter difference of the two, there is intercommunication groove 6-1 on valve interconnection 6, so that well fluid can enter the pump cavity 8-1 after passing through liquid inlet valve 7 during lower stroke, well fluid can be discharged from the pump cavity 8-1 and be discharged to the upper portion of rod joint 1 through liquid discharge valve 5 during upper stroke, gas transfer groove 3-2 is set on upper piston 3, the length of gas transfer groove 3-2 is less than the length of upper pump cylinder 2.

[0009] The number of the gas transfer groove 3-2 set on upper piston 3 is 1 to several, the lower end of the first gas transfer groove 3-2 counted from upper to lower is below the lower end of upper pump cylinder 2 when upper piston 3 is at the lower starting point, the distance between the lower end of the upper gas transfer groove 3-2 and the upper end of the next gas transfer groove 3-2 is less than the length of upper pump cylinder 2.

[0010] The principle of the utility model is: due to the density difference between gas and liquid, the gas is in the upper portion of the pump cavity 8-1, the gas transfer groove 3-2 is in the upper portion of the pump cavity 8-1 when upper piston 3 goes up, the gas is transferred to the upper portion of upper pump cylinder 2 through the gas transfer groove 3-2, thereby eliminating the influence of gas on the operation of the oil well pump.

[0011] According to the depth of the well and the size of upper pump cylinder 2, the connection part of the pump upper oil pipe and the utility model is determined. If the pump is deep or the diameter of upper pump cylinder 2 is small, the strength cannot meet the requirement of the well, the connecting pipe is installed on the upper end of pump cylinder joint 4, the connecting pipe is outside upper pump cylinder 2, the upper portion of the connecting pipe is connected with the pump upper oil pipe. If the pump is shallow or the diameter of upper pump cylinder 2 is large, the strength can meet the requirement of the well, the pump upper oil pipe can be directly connected with the upper portion of upper pump cylinder 2.

[0012] The upper pump cylinder 2, the upper piston 3, the lower pump cylinder 8, the lower piston 9, the liquid discharge valve 5 and the liquid inlet valve 7 are standard components.

[0013] The utility model discloses also can add liquid inlet valve in lower pump cylinder 8 lower extreme, form the anti -air -variable displacement oil -wells pump.

[0014] The utility model discloses also can add component to it, form the rod type anti -air feedback oil -wells pump or rod type anti -air -variable displacement oil -wells pump.

Claims

1. A gas feedback-proof oil pump, comprising a rod joint (1), an upper pump barrel (2), an upper piston (3), a pump barrel joint (4), a drain valve (5), a valve joint (6), an inlet valve (7), a lower pump barrel (8), and a lower piston (9). The drain valve (5) and the inlet valve (7) are one-way valves, and the well fluid can only flow upward through the drain valve (5) and the inlet valve (7), and cannot flow downward through the inlet valve. The pump diameter of the upper pump barrel (2) is smaller than the pump diameter of the lower pump barrel (8), and the length of the upper piston (3) is greater than the length of the upper pump barrel (2). The rod joint (1), the upper piston (3), the drain valve (5), the valve joint (6), the inlet valve (7), and the lower piston (9) are connected in sequence. The upper piston (3) is internally connected to the rod joint (1) or the upper piston (3). The discharge channel is connected to the outside. The upper piston (3) passes through the upper pump cylinder (2) and the pump cylinder connector (4). The lower pump cylinder (8) is fitted outside the lower piston (9). The upper pump cylinder (2), the pump cylinder connector (4), and the lower pump cylinder (8) are connected in sequence. The upper piston (3) and the upper pump cylinder (2) are sealed together. The lower piston (9) and the lower pump cylinder (8) are sealed together. The outer wall of the upper piston (3) and the inner wall of the lower pump cylinder (8) form a pump chamber (8-1) due to the difference in their diameters. There is a connecting groove (6-1) on the valve joint (6) so that the well fluid can enter the pump chamber (8-1) after passing through the inlet valve (7) during the downstroke. During the upstroke, the well fluid can be discharged from the pump chamber (8-1) and discharged to the rod joint (1) through the discharge valve (5). Its characteristics are: A gas transfer groove (3-2) is arranged on the upper piston (3), and the length of the gas transfer groove (3-2) is less than the length of the upper pump barrel (2).

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