Sliding sleeve assembly and construction pipe column

Abstract

The invention relates to the technical field of oil production engineering, and discloses a sliding sleeve assembly and a construction pipe column. The sliding sleeve assembly comprises a ball intercepting sliding sleeve and at least one ball passing sliding sleeve, wherein the at least one ball passing sliding sleeve is coaxially connected to the front of the ball intercepting sliding sleeve, the ball passing sliding sleeve is configured to be capable of pushing a first sealing inner sleeve to move to the rear section of a first outer sleeve through pressure building of a fracturing ball so as to open a first flow guide opening and release the fracturing ball into the ball passing sliding sleeve or the ball intercepting sliding sleeve behind the first flow guide opening, and the ball intercepting sliding sleeve is configured to be capable of pushing a second sealing inner sleeve to move to the rear section of a second outer sleeve through pressure building of the fracturing ball so as to open a second flow guide opening and block a rear end opening of the second outer sleeve. According to the sliding sleeve assembly, the ball passing sliding sleeve and the ball intercepting sliding sleeve can be completely opened through one-time ball throwing, the level difference does not exist between the sliding sleeves, the number of construction sections of the construction pipe column can be increased on the premise that the extreme difference of the fracturing ball is not changed, and therefore the productivity advantage of an oil-gas well is fully exerted.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a sliding sleeve assembly and a construction string comprising the sliding sleeve assembly. Background technique [0002] During the development of oil and gas wells, staged fracturing / acidizing is often used to increase the production of oil and gas wells. Construction strings for fracturing / acidizing are typically run with multi-stage slip-on tools. However, the currently used multi-stage sliding sleeve can only open one sliding sleeve each time the ball is thrown, and there is a step difference between the sliding sleeves. It is necessary to use fracturing balls with different sizes to realize the opening of the multi-stage sliding sleeve, and the size of the completion string is limited. The fracturing ball cannot be infinitely small or infinitely large, so the number of sliding sleeve stages is limited, so that the number of construction stages is limited...

AI Technical Summary

Problems solved by technology

However, the currently used multi-stage sliding sleeve can only open one sliding sleeve each time the ball is thrown, and there is a step difference between the sliding sleeves. It is necessary to use fracturing balls with different sizes to realize the opening of the multi-stage sliding sleeve, and the size of the completion string is limited. The fracturing ball cannot be infinitely small or infinitely large, so the number of sliding sleeve stages is limited, so that the number of construction stages is limited, and the productivity advantages of oil and gas wells cannot be fully utilized.

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