A kind of reservoir leakage prevention and completion tool

Abstract

The invention discloses a reservoir leakage prevention and completion tool, comprising an outer cylinder structure and an inner cylinder structure; the outer cylinder structure comprises an upper joint, a locking cylinder, an intermediate connecting cylinder, a plate valve outer cylinder and a lower joint, the inner cylinder The barrel structure includes a supporting sleeve, a plate valve structure, a first connecting sleeve, a second connecting sleeve and a locking sleeve structure; the present invention has the function of preventing leakage, and can be run in together with the completion string, so as to realize formation protection and at the same time in the production process The valve plate is automatically opened by using the negative pressure difference between the upper and lower liquid columns of the valve plate. After the operation, the valve plate is automatically closed under the action of the torsion spring, and there is no need to run a special switch tool separately, which saves the operation time and operation cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering, and in particular relates to a reservoir leakage prevention and completion tool. Background technique [0002] With the development of the petroleum industry, the operation timeliness, operation cost and operation safety of oil and gas field development and production have become more and more key issues. After long-term exploitation of oil and gas fields, the formation energy deficit and pressure drop will be caused. In the process of well completion and workover operations Formation leakage will occur, which not only affects the normal production and management of oil wells, but also causes bottom pollution. In the current oil and gas field development, in order to prevent leakage or overflow during the running of the production string or workover, the completion fluid must be continuously injected into the well. The completion fluid leaked into the reservoir will not only pollute...

AI Technical Summary

Problems solved by technology

At present, the anti-leakage valve used to seal oil and gas wells mainly adopts ball valve and sliding sleeve structure. During the production operation of the ball valve structure, a special tool needs to be lowered separately to open the ball valve spool, and the oil field can be produced. Moreover, when the special tool cannot be used When opening the ball valve, it is necessary to use a drill to drill out the ball valve, but because the ball valve is a solid structure, it will increase the difficulty of the operation; the operation of the sliding sleeve reservoir protection valve is complicated, and the operation of steel wire is required, and the operation procedure is complicated

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