An annular safety valve

Abstract

The invention discloses an annulus safety valve. The annulus safety valve comprises an outer barrel structure and an inner barrel structure. The outer barrel structure comprises a pressure transmission piston sleeve, an upper spring sleeve, a sliding sleeve connecting sleeve and a lower spring sleeve which are sequentially connected from top to bottom. The inner barrel structure comprises a sliding sleeve central pipe, a connecting central pipe and a central pipe which are sequentially connected from top to bottom. An upper annulus is formed between the pressure transmission piston sleeve and the upper spring sleeve of the outer barrel and the sliding sleeve central pipe of the inner barrel. A hydraulic control annulus opening and closing device is installed in the upper annulus. A lower annulus is formed between the lower spring sleeve of the outer barrel and the connecting central pipe and the central pipe of the inner barrel. A standby annulus opening and closing device is installed in the lower annulus. A hydraulic control pipeline is used for opening and closing the annuluses. Under the circumstance that the hydraulic control pipeline is out of operation, a standby channel is opened in an annulus pressing mode. When water injection of the annuluses is stopped, the standby channel can be automatically closed, and well control safety is guaranteed.

Description

technical field [0001] The invention relates to a double-pipe water injection annular space safety device, in particular to an annular space safety valve. Background technique [0002] At present, the sand production reservoir water injection in Chengdao Oilfield adopts the large-diameter layered sand control measurement and adjustment water injection process, that is, the sand control process string and the setting process string are first run in, and then the measurement and adjustment water injection string is lowered. This process needs to carry out the deployment of a steel wire operation every once in a while, and the workload is relatively large. The realization of double-pipe water injection matched with large-diameter layered sand control can reduce the test and deployment of steel wires, reduce water injection costs, and improve water injection development effects. The annular safety valve can prevent blowout or overflow, and is an important tool to ensure the saf...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an annulus safety valve to solve the problems existing in the prior art that the opening and closing of the annulus cannot be accurately controlled and that it cannot be matched with the new double-pipe process

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