Specific oil well pump for horizontal well

Abstract

The invention relates to a petroleum exploitation machinery, in particular to a specific oil well pump for a horizontal well. The specific oil well pump for the horizontal well comprises a pump cylinder, a plunger assembly and a fixed valve assembly. The plunger assembly comprises a plunger connector, a plunger, a valve ball valve seat and a plunger inner pipe. The valve ball valve seat adopts a cone-shaped ball and a cone-shaped seat, and the cone-shaped ball and the cone-shaped seat work in conjunction. The plunger is arranged in the plunger inner pipe in a sleeving manner. The upper end of the pump cylinder is hung in the air and the lower end of the pump cylinder is connected with the fixed valve assembly. The upper outer wall of the fixed valve assembly is connected with a connector and the upper inner wall of the connector is connected with a force bearing outer pipe. According to the specific oil well pump for the horizontal well, the force bearing outer pipe is arranged outside the pump cylinder, when the oil well pump is working, the annular space between the pump cylinder and the outer pipe would be filled with oil liquid, and the internal-external pressure difference is balanced, so that the working environment of the pump cylinder is greatly improved, the reduction of the pump efficiency caused by the increase of the leakage volume is avoided, at the same time the valve ball valve seat of the plunger adopts a cone-shaped valve, so that the situation that the valve ball valve seat of the horizontal well can not be sealed is avoided.

Description

technical field [0001] The invention relates to a petroleum mining machine, in particular to a special oil well pump for horizontal wells. Background technique [0002] Many oilfields in my country have entered the middle and late stages of exploitation, and the formation pressure has dropped, so many oilfields have to adopt small pump deep pumping technology. But with the deepening of the pump hanger, the working environment of the oil well pump is even worse. Taking Zhongyuan Oilfield as an example, the depth of many downhole pumps has exceeded 2,000 meters, and the pressure difference between the inside and outside of the downhole pump barrel has reached nearly 20 MPa, or even higher. In view of the above reasons, under the action of the internal and external pressure difference of the pump barrel, it will cause the so-called "bulging effect" of the oil well pump barrel, causing the oil well pump to produce clearance leakage. The greater the pressure, the greater the cle...

AI Technical Summary

Problems solved by technology

In view of the above reasons, under the action of the internal and external pressure difference of the pump barrel, the so-called "bulging effect" will occur in the oil well pump barrel, causing the oil well pump to produce clearance leakage. The greater the pressure, the greater the clearance loss, which will reduce the pump efficiency of the oil well pump.

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