A deep-water oil and gas test retention valve pressure relief protector

Abstract

The invention discloses a decompression protector of a detaining valve for deep-water oil and gas testing. The decompression protector mainly comprises an outer shell, a spring, a blocking piece, a limiting block, a slide sleeve, a control oil acting block, a control joint and a squeezing-type sealing ring. According to the decompression protector, the design of three layers of structures of the blocking piece, the slide sleeve and the outer shell is adopted, through trapping pressure at the annulus position and the control pressure of a controller, the positions of the blocking piece and theslide sleeve are controlled, and there are three stations including normal position, decompression and release control. According to the decompression protector, there is no need to additionally arrange other control pipelines, and the cost is low. The decompression protector is provided with a blocking mechanism, three times of blocking of annulus pressure can be achieved, extrusion-type sealingis set, and the sealing capacity of tools is improved; and meanwhile, a guiding slide block, a reset spring and a decompression channel are arranged, and the movement stability and decompression efficiency of the tools are improved. By means of the decompression protector, trapping pressure at the annulus position for deep-water oil and gas testing can be achieved, the occurrence of misoperation that a connector is switched off while the trapping pressure is not released is avoided, and the safety of deep-water oil and gas testing is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of formation testing of deep-water oil and gas wells, in particular to a pressure relief protector for a retaining valve for deep-water oil and gas testing. Background technique [0002] Formation testing of deepwater oil and gas wells is a key link in the discovery and accurate evaluation of oil and gas reservoirs during the development of deepwater oil and gas resources. As the main safety barrier for deep-water oil and gas testing, the pipe string system can quickly complete the plugging and release of the pipe string in an emergency to ensure the rapid evacuation of the drilling ship from the wellhead. Among them, the retention valve and the underwater test tree are used as the key tools of the string system, the retention valve is used to block the liquid inside the test string on the mud line, and the underwater test tree is used to block the liquid inside the test string below the mud line . During ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a deep-water oil and gas test retaining valve pressure relief protector for the existing problems and demands of the existing deep water oil and gas test retaining valve pressure relief protector, which solves the problem that the trap pressure is not released in an emergency Eliminate or fail to judge whether it has been released, but the safety problem caused by the misoperation of the connector has been disconnected, and the safety effect of disconnecting the connector can only be realized after the trap pressure is released; it solves the current sealing structure For the plugging performance problem of unsatisfactory annular pressure, three times of plugging are adopted, and a squeeze type seal is provided at the same time to improve the plugging ability of the pressure relief protector; the stability problem of the pressure relief process is solved, and the guide slider and The return spring improves the stability of the pressure relief protector, and a pressure relief channel is provided to improve the pressure relief efficiency when the blockage is released

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