Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top

Abstract

The invention relates to a completed well body structure with a temporary plugging function screen pipe and a well completion method for injecting cement on the top. The well body structure comprises a multifunctional well washing valve, a screen pipe, a blind plate, a pipe external isolator and a grading cement injector which are sequentially connected from bottom, top to a well opening; the screen pipe with the temporary plugging function is adopted, and each through hole of a center pipe of the screen pipe is provided with a plugging cover. The well completion method comprises the following steps of: firstly, constructing a pipe string of the well body structure with the temporary plugging screen pipe, taking the pipe string to the position by a tool, carrying out slurry replacement by reverse circulation, opening the well washing valve under the action of pressure and establishing a circulating passage; after the slurry replacement is finished, throwing a ball into the pipe string, pressing the pipe external isolator, continuously pressurizing, opening the grading cement injector and carrying out top cement injection well fixing operation; putting a drill down to drill the blind plate and the plugging cover of the screen pipe; and putting into production. The invention can solve the problem of slurry cake plugging in the process of putting down the screen pipe, greatly simplify the traditional well completion slurry replacement operation way, reduce the drill-down frequency, save the operation time and improve the replacement efficiency.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well exploitation, and in particular relates to a well completion well body structure with a temporary plugging function screen pipe and a top cementing well completion method thereof. Background technique [0002] Screen completion is now a well completion method widely used at home and abroad. Among them, the role of the screen is to provide a channel for oil and gas to enter the wellbore. For sand producing wells, it acts as a filter, which can effectively prevent various hazards caused by formation sand production. For oil and gas wells that do not produce sand, it mainly plays a role in maintaining Wellbore stability and the function of preventing debris from entering the wellbore. However, the implementation of the screen sand control completion process needs to effectively solve the problem of drilling fluid blocking the screen and the well wall. [0003] First of all, it is necessary...

AI Technical Summary

Problems solved by technology

[0023] Another object of the present invention is to provide a top cementing well completion method, which changes the existing screen completion process, redu

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