Expansion core type mechanical device for replacing valve under pressure

Abstract

The invention relates to the technical field of gate valve replacing devices, particularly to an expansion core type mechanical device for replacing a valve under pressure. The expansion core type mechanical device comprises a fixed rack, an ejector rod, a connecting disk, a pushing disk, a process flange and a sealing flange, wherein at least two double-thread screws are fixed between the fixed rack and the connecting disk, at least one hydraulic cylinder is fixed on the connecting disk, a penetrating hole is formed in the middle of the connecting disk, a piston rod is arranged in the hydraulic cylinder and fixed with the pushing disk together, the right end of the ejector rod is fixed on the pushing disk, and the middle of the ejector rod is located in the penetrating hole. The expansion core type mechanical device is reasonable and compact in structure and convenient to use, gate valves can be replaced under pressure, in the gate valve replacing process, the good sealing performance can be guaranteed, the pressure leakage can be prevented, and the pollution and killing of oil reservoirs due to well-killing gate valve replacement can be avoided, so that the resurrection operation of killed oil reservoirs is avoided, meanwhile, the pollution discharge operation of polluted oil reservoirs is avoided, and the oil and gas production cost is saved.

Description

technical field [0001] The invention relates to the technical field of gate valve replacement devices, and relates to a core-expanding mechanical belt pressure replacement valve device. Background technique [0002] As the exploitation of oil and gas fields gradually enters the mid-to-late stage of exploitation, during the exploitation process, the working environment of the Christmas tree and its valves deteriorates, they are constantly corroded by hydrogen sulfide, exposed to the sun and rain for a long time, and the valves are frequently switched on and off, resulting in damage, so the valve needs to be replaced frequently. However, in the process of pressurized production, when the valve of the Christmas tree is damaged, it is difficult to replace it. The existing method of replacing the valve is to press the well and then replace the valve. This will cause the medium and low pressure wells in the middle and late stage of exploitation to be crushed to death or pollute t...

AI Technical Summary

Problems solved by technology

[0003]The present invention provides a core-expanding mechanical belt pressure replacement valve device, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of existing gate valve replacement devices. Problems of polluting production layers and crushing oil layers in the process of replacing gate valves

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