Sliding sleeve

Abstract

The invention discloses a sliding sleeve. The sliding sleeve comprises a sleeve and a central sliding sleeve arranged in the sleeve, wherein the sleeve and the center sliding sleeve are coaxially sleeved and slidably connected, a sleeve hole is formed in the pipe wall of the sleeve, a sliding sleeve hole is formed in the pipe wall of the center sliding sleeve, and a sealing step protruding outwards in the radial direction is arranged in the axial middle of the center sliding sleeve; the step surfaces on the two sides of the sealing step are adjacent to a first pressure cavity and a second pressure cavity correspondingly; a high-pressure medium introduced into the first pressure cavity pushes the central sliding sleeve to slide until the sleeve hole is aligned and communicates with the sliding sleeve hole; and a high-pressure medium introduced into the second pressure cavity pushes the central sliding sleeve to slide to the sleeve hole and the sliding sleeve hole to be plugged in a staggered manner. According to the sliding sleeve, under the sliding assembly relation of the sleeve, the center sliding sleeve and the sealing step of the sleeve, the center sliding sleeve is driven by the high-pressure medium to axially slide in the sleeve in a reciprocating mode, operation is easy and reliable, and the requirements of fracturing operation and oil reservoir subsection development can be better met.

Description

technical field [0001] The invention relates to the field of oil and gas field exploitation, in particular to a sliding sleeve. Background technique [0002] Fracturing is one of the essential technical means for reservoir completion, and sliding sleeves and packers are usually required in this process. According to the needs of reservoir development, construction personnel need to use a divider to divide the horizontal well section into several sub-wells, and then open the sliding sleeves corresponding to the aforementioned multi-segment sub-wells step by step, so as to realize staged production in the aforementioned multi-segment sub-wells . [0003] However, most of the sliding sleeves currently used are disposable casings. Although the sliding sleeves can be opened step by step by using multi-stage pitching to realize segmental development of reservoirs, the restriction based on the separation pressure of pitching balls greatly limits the fracturing process. The number...

AI Technical Summary

Problems solved by technology

[0003] However, most of the sliding sleeves currently used are disposable casings. Although the sliding sleeves can be opened step by step by using multi-stage pitching to realize segmental development of reservoirs, the restriction based on the separation pressure of pitching balls greatly limits the fracturing process. The number of stages has great restrictions on the segmented development of reservoirs; the second is that the sliding sleeve products that use the ball to open step by step have high requirements on structural performance, resulting in poor reliability of the product; the third is that the sliding sleeve is difficult to open and close repeatedly , the adjustment process is complicated when it is used again, and it is difficult to meet the actual needs of reservoir segmental development

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