Wellbore control tool for under-pressure pump lowering

Abstract

The invention discloses a wellbore control tool for under-pressure pump lowering. The wellbore control tool comprises a fixed part and a movable part, wherein the movable part is located on the fixed part and comprises an upper connector, an upper center pipe, a hydraulic cylinder barrel and a piston, the bottom of the outer wall of the upper connector is fixedly connected to the top of the inner wall of the hydraulic cylinder barrel, the bottom of the inner wall of the upper connector is fixedly connected to the top of the outer wall of the upper center pipe, the piston is arranged between the upper central pipe and the hydraulic cylinder barrel, the fixed part comprises a lower connector and a track center pipe, an inner communicating hole, a guide rail and an adjusting assembly are sequentially arranged on the outer side wall of the track center pipe from top to bottom, a limiting ring and a limiting groove are formed in the track center pipe, a second valve ball is arranged on one side of the bottom face of the limiting ring, a lower flange is arranged in the limiting groove, and an ejecting spring is arranged between the lower flange and the second valve ball. According to the wellbore control tool for the under-pressure pump lowering, repeated well opening and closing and under-pressure column rising and lowering can be achieved, the blowout prevention waiting time is short, and the overall productivity and the service life of a wellpore are guaranteed.

Description

technical field [0001] The invention relates to the technical field of wellbore control tools, in particular to a wellbore control tool with a pump under pressure. Background technique [0002] At this stage, it is internationally recognized that mechanical production should be involved as early as possible in the post-pressure and blowout stage, and pumping tools such as electric submersible pumps can be used to save reservoir energy, which is of great significance for improving the overall productivity of shale oil single wells and prolonging the life of oil wells. However, the existing technology cannot meet the requirements of the electric submersible pump under pressure (≥10Mpa) during the blowout stage, and the pumping operation can only be carried out after the wellhead pressure drops to about 0 or the gas well is under pressure within 10Mpa. Not only the cost of running the pump is high (1 million / time), the well cannot be switched on and off repeatedly and the pipe ...

AI Technical Summary

Problems solved by technology

However, the existing technology cannot meet the requirements of the electric submersible pump under pressure (≥10Mpa) during the blowout stage, and the pumping operation can only be carried out after the wellhead pressure drops to about 0 or the gas well is under pressure within 10Mpa. Not only the cost of running the pump is high (1 million / time), the well cannot be switched on and off repeatedly and the pipe string is lifted under pressure, but also the service life of the wellbore is reduced, and the overall production capacity is also affected due to the long blowout time

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