Well mouth gate valve with automatic under-pressure sleeve replacement mechanism

Abstract

The invention belongs to the technical field of well mouth gate valves, and particularly relates to a well mouth gate valve with an automatic under-pressure sleeve replacement mechanism. The well mouth gate valve aims to solve the problem that under-pressure sleeves are difficult to disassemble and replace due to the fact that a valve body of an existing well mouth gate valve and the under-pressure sleeves on the two sides are generally of an integrated structure. The well mouth gate valve comprises a valve body, a mounting disc, a sleeve joint, an upper valve pipe, a valve plate and a lower valve pipe, and the upper valve pipe is fixedly mounted at the top of the valve body through bolts. The sealing effect of the joint of the valve body and the sleeve joint is remarkably improved, petroleum is prevented from leaking out of the joint, the sleeve joint is fixed by inserting a positioning insertion rod into a positioning insertion groove, the sleeves are conveniently replaced by changing the air pressure in an annular sealing air bag and a cavity, a connecting plate is kept at the height through blocking of a check block, the oil conveying speed is adjusted, petroleum is filtered through a filtering mechanism, and the purity of the petroleum is guaranteed.

Description

technical field [0001] The invention relates to the technical field of wellhead gate valves, in particular to a wellhead gate valve with a pressure casing automatic replacement mechanism. Background technique [0002] An oil well is a hole drilled according to the well layout system of the oil field development plan for the exploitation of oil. The oil rises from the bottom of the well to the wellhead. Generally, after the oil well reaches the oil layer, it is lowered into the oil layer casing, and the casing and the well wall are connected. Inject oil well cement into the annular space between them to maintain the well wall and seal the oil, gas, and water layers. Afterwards, according to the requirements of oil field development, use a perforating gun to open the oil layer to form a channel and lower it into the tubing. From the bottom of the oil well to the wellhead; [0003] The wellhead gate valve is mainly used in the wellhead pipeline. The valve body of the wellhead ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a wellhead gate valve with a pressure casing automatic replacement mechanism, the joint is initially sealed by the sealing ring, and the annular sealing air bag is used for secondary sealing of the connection, which significantly improves the valve body and casing. The sealing effect of the connection between the two joints can prevent oil from leaking out from the joint. The positioning insert rod is inserted into the positioning slot to realize the fixing of the sleeve joint. air pressure, thereby changing the air pressure in the ring-shaped sealed air bag and the cavity, which facilitates the replacement of the bushing, without the need for manual replacement with the help of related tools. The adjustment of the oil speed, the oil is filtered through the filter mechanism, and the impurities in the oil are filtered out to ensure the purity of the oil, which solves the problem that the valve body of the existing wellhead gate valve and the pressurized casing on both sides are generally integrated. Difficulty in removing and replacing the pressurized bushing

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