Oil production wellhead gate valve under pressure replacement device and gate valve under pressure replacement method

Abstract

The present invention relates to apparatus and method of the gate valve with a pressure change with pressure wellhead valve replacement means comprising a screw shaft, slip assemblies, the cylinder, the sealing sleeve, the outer sleeve, the spindle nut, hydraulic valves and fittings, wherein the card tile assembly and a hydraulic cylinder is fitted over the front section of the optical axis of the threaded shaft portion, a rear cylinder by a sealing gland; rear portion of the screw shaft by the threaded section has an outer sleeve set screw nut, is fixed by the lock nut, the inner and the outer sleeve has a shape adapted to clamp connection; length of the central threaded shaft provided with a through hole in a hydraulic, fixed to the screw shaft by the rear end of the hydraulic valves and fittings external pressure pump; hydraulic radial hole provided communicating the hydraulic cylinder into the hole.The method is by cutting off the pressure oil from the wellhead to achieve the purpose of the replacement valve under pressure.The present invention is simple structure, low manufacturing cost, simple operation, can save a lot of manpower and resources, to improve the efficiency of maintenance and replacement, and does not affect the normal oil production.

Description

technical field [0001] The invention relates to the technical field of maintenance and replacement of oil field equipment, in particular to a device for replacing a gate valve under pressure at an oil production wellhead and a method for replacing the gate valve under pressure. Background technique [0002] The oil production wellhead is an important device in the oil production equipment in the oil field, and the gate valve is the main part of the oil production wellhead. When the gate valve fails, it needs to be replaced, but the routine maintenance and replacement of the gate valve must stop the production and release the pressure; the shutdown will affect the progress of the oil production work, and the pressure relief A large amount of chemical agents and water that have been injected into the well will be pumped back to the tank truck, and after the gate valve is replaced, a large amount of chemical agents and water will be injected into the well, which will increase a ...

AI Technical Summary

Problems solved by technology

[0002] The oil production wellhead is an important device in the oil production equipment of the oil field, and the gate valve is the main part of the oil production wellhead. When the gate valve fails, it needs to be replaced, but the routine maintenance and replacement of the gate valve must stop the production and release the pressure; the shutdown will affect the progress of the oil production work, and the pressure relief A large amount of chemical agents and water that have been injected into the well will be pumped back to the tank truck, and after the gate valve is replaced, a large amount of chemical agents and water will be injected into the well, which will increase a lot of workload, time-consuming and labor-intensive

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