Swelling type screen pipe suspension method

Abstract

The circular screen completion method is applied to the completion of screens in oil and gas wells. Its features are: A. Run the screen completion string into the wellbore; B. Inject drilling fluid; C. Throwing balls to suppress pressure and seat seal expansion type screen hanger; D, throwing the ball to suppress pressure, open the channel between the drill string and the screen string; E, inject drilling fluid, and flush the inner wall of the screen string; F, pull out the screen completion string, and complete the Circulating screen completion operations. The effect is that the completion of the well with the screen suspended can be realized by using the circular screen completion method. It breaks the traditional practice of screen pipe suspension construction. During the construction process, the drilling fluid can be circulated at any time to minimize the damage to the oil layer during drilling, maximize the recovery value of the oil layer permeability, and increase the recovery rate; compared with the conventional screen completion method, only through Running a construction pipe string into the well can complete the suspension completion of the circulating screen pipe, improve the completion efficiency and save construction costs.

Description

technical field [0001] The patent of the present invention relates to an oil and gas well completion method, in particular to a well completion method of downhole screens, more specifically to an expansion type screen suspension completion method and an expansion type screen hanger. Background technique [0002] The use of screen completion can improve the sand control ability of oil and gas wells and prolong the workover period of oil and gas wells. At present, more and more oil and gas fields at home and abroad adopt the screen hanging completion method. The conventional screen hanging completion method is to connect the screen string to the lower end of the feeding pipe string, put the screen string to the bottom of the well; then hang the screen seat on the lower end of the inner wall of the casing; Throw away the screen string; lift it up and send it into the pipe string; drill down again, drill the blind plate inside the screen string, and clean the inner wall of the ...

AI Technical Summary

Problems solved by technology

There are following deficiencies: when the screen string is running into the well, the circulation cannot be established, and the screen string and the bottom hole cannot be cleaned circularly. The mud, aggravated the pollution of the oil layer

During the construction process, the next drill string is required to drill the blind plate in the screen string, which will prolong the construction time of the screen string suspension and increase the drilling times

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