Downhole safety valve

Abstract

A downhole safety valve is connected into an oil pipe; a hydraulic cavity in an upper joint is provided with a piston rod; the hydraulic cavity is connected with a hydraulic control pipeline; the tailis connected with a spring sleeve; a spring in the spring sleeve is located between a driving pipe and an upper valve seat; the upper valve seat is connected with the spring sleeve; the driving pipeis connected with an upper central pipe; the driving pipe is in clearance fit with the upper joint; the upper valve seat is in clearance fit with the upper central pipe; the upper valve seat is connected with an upper valve plate; the upper valve seat is internally provided with an upper self-balancing component; the spring sleeve is connected with a transition joint A; the transition joint A is fixedly connected with a lower valve seat; a shear pin is connected with the lower valve seat; the lower valve seat is connected with a lower valve plate; the lower valve seat is provided with a lowerself-balancing component; and the lower valve seat is connected with a lower joint. Through the design of the upper-lower two-stage valve plates or more-stage valve plates, and by increasing the pressure of the control pipeline, a secondary valve plate is controlled to open and close by pushing the upper central pipe to cut the shear pin in the lower valve seat; and the service life of the safetyvalve is prolonged, and the material procurement cost of oil fields is reduced.

Description

technical field [0001] The invention relates to a downhole valve, in particular to a downhole safety valve. Background technique [0002] The downhole safety valve is a downhole tool to prevent blowout and ensure production safety. In the oil exploitation industry, the flow rate of hydrocarbon fluid often increases due to failure of exploitation equipment and other reasons during downhole operations. At this time, it is necessary to close the fluid channel in time to ensure operation safety and avoid greater accidents. In actual production, the downhole safety valve is usually used to close the fluid passage, and realize the blocking function of the fluid in the tubing when abnormal conditions occur in the well. Countries around the world are paying more and more attention to environmental protection and safe production. Many countries have detailed laws and regulations on the safe production of oil and gas wells, emphasizing that those located in densely populated areas, i...

AI Technical Summary

Problems solved by technology

When the downhole safety valve is damaged, there are two solutions in the existing technology: 1. Replace the downhole safety valve, but the operation of replacing the downhole safety valve is very difficult, and the operation faces a relatively large safety risk; 2. Use a valve with two valves When the first valve plate is damaged, the second valve plate is activated by running a tool into the tubing. The disadvantage of this scheme is that wellbore operations are also required, and it faces greater safety risks and consumes a lot of energy. Time

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