Well completion pipe string and sand control pipe string thereof

Abstract

The invention provides a well completion pipe string and a sand control pipe string thereof. The sand control pipe string comprises a bottom mud displacement valve, a screen pipe string and a center pipe assembly; one end of the screen pipe string is connected with the bottom mud displacement valve; the center pipe assembly is arranged in the screen pipe string in a sleeved mode, and one end of the center pipe assembly extends into the bottom mud displacement valve; the bottom mud displacement valve comprises a pipe string and an elastic plugging piece, and the elastic plugging piece is arranged in the pipe string; one end of the center pipe assembly abuts against the elastic plugging piece, and through holes are formed in the pipe walls of the pipe string and one end of the central pipe assembly; the center pipe assembly is made of a soluble material; and the inner wall of a first end of the screen pipe string and the outer wall of the center pipe assembly are sealed, and the outer wall of the center pipe assembly and the inner wall of one end are sealed, close to the screen pipe string, of the pipe string is realized. According to the well completion pipe string and the sand control pipe string thereof, the center pipe assembly is adopted to seal a flow channel of the screen pipe string, the bottom mud displacement valve is adopted to establish a mud displacement flow channel, and sufficient mud displacement and clean well completion are realized at the bottom of a production interval.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a completion pipe string and a sand control pipe string thereof. Background technique [0002] Oil and gas field development includes three processes, which are oil and gas well drilling operations, well completion operations, and oil production operations. Well completion operations are required in the later stages of drilling operations, and well completion operations are the beginning of oil production operations. Well completion operations have a significant impact on drilling operations and oil production operations. Plays an important role in linking the past and the future. [0003] Due to the generally high formation pressure coefficient of ultra-high pressure and high production oil and gas wells, in order to ensure the safety of well control during drilling operations, heavy mud should be used to kill wells. During well completion operations, heav...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a well completion pipe string and its sand control pipe string to solve the problem that the existing sand control pipe string cannot fully replace the heavy mud at the bottom of the reservoir layer

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