Mounting method and mounting device for replacing valve under pressure

Abstract

The invention discloses a mounting method and a mounting device for replacing a valve under pressure. The mounting device comprises a motor, an oil pump, a mounting frame, a clamp board and a positioning bolt, wherein the mounting frame comprises a hydraulic cylinder of which a hydraulic rod is provided with a connecting plate; the connecting plate is provided with a stopper hydraulic rod of which the bottom is detachably provided with a stopper; a spray arrester is sleeved outside the stopper hydraulic rod; the hydraulic cylinder in the mounting frame is driven by the motor and the oil pump; the center of the clamp board is provided with an internal thread through hole; the clamp board is provided with a bayonet communicated with the internal thread hole and the outer edge of the clamp board; the clamp board at the periphery of the internal thread through hole is distributed with through holes; the periphery of the positioning bolt is provided with a section of external threads matched with the internal thread through hole; the center of the positioning bolt is provided with a central through hole; and the side wall of the positioning bolt is provided with an opening. The mounting device for replacing the valve under pressure can safely, conveniently and quickly complete the replacement of a main control valve of a X-mas tree on a well head.

Description

technical field [0001] The invention relates to a replacement method and implementation device for a main control valve of a wellhead Christmas tree, in particular to an installation method and a device for replacing a valve with pressure. Background technique [0002] For the wellhead Christmas tree on the petroleum engineering site, the method usually used when replacing the wellhead valve is: after the plug is placed in the predetermined position, all devices after the plug are removed, and then the valve replacement operation is performed. This method has major safety hazards, that is, the plugging method alone is not enough to deal with complex and changeable situations in the downhole and uphole: 1. When the downhole pressure is too large, the plugger cannot withstand the strong downhole pressure, and the seat seal Failure and leakage; 2. When the valve is replaced, due to the impact of external force on the tail of the plug, the plug seat is not tightly sealed and lea...

AI Technical Summary

Problems solved by technology

This method has major safety hazards, that is, the plugging method alone is not enough to deal with complex and changeable situations in the downhole and uphole: 1. When the downhole pressure is too large, the plugger cannot withstand the strong downhole pressure, and the seat seal Failed and leaked; 2. When replacing the valve, due to the impact of external force on the tail of the plug, the seat seal of the plug is not tight and leakage occurs; 3. Leakage occurs when the plug seat fails

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