An unlimited-stage cementing sliding sleeve for horizontal well fracturing

CN224379809UActive Publication Date: 2026-06-19CHINA PETROLEUM & CHEMICAL CORP +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: CHINA PETROLEUM & CHEMICAL CORP
Filing Date: 2025-08-25
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

In existing horizontal well fracturing technologies, there are problems such as long cementing sleeve dissolution time, insufficient fracturing pressure, and sleeve jamming that prevents normal opening.

Method used

A horizontal well fracturing infinite-stage cementing sleeve is designed. By setting a key sleeve and a dissolution groove inside the sleeve, a soluble metal ball is used for sealing and pressurization. The key sleeve drives the sleeve to move and dissolves quickly after fracturing. Combined with a U-shaped opening groove and a sealing element, the sealing effect is improved.

Benefits of technology

It enables rapid dissolution of the cementing sleeve, avoids mud coagulation, improves the efficiency and sealing effect of fracturing operations, and reduces construction costs.

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Abstract

This utility model discloses an infinite-stage cementing sleeve for horizontal well fracturing, including a connecting outer sleeve. An upper connector and a lower connector are detachably provided at the upper and lower ends of the connecting outer sleeve, respectively. A connecting hole is provided on the side wall of the connecting outer sleeve, and a sliding sleeve is provided on the inner side of the connecting outer sleeve. A key-shaped sliding sleeve is provided on the inner side of the sliding sleeve. A ball is provided at the upper end of the key-shaped sliding sleeve, and a dissolution groove is provided on the side wall of the key-shaped sliding sleeve. An opening groove is provided at the lower end of the key-shaped sliding sleeve, which can drive the sliding sleeve to move. The dissolution groove and opening groove of this utility model facilitate rapid dissolution of the mud located at the key-shaped sliding sleeve after fracturing, preventing mud coagulation and addressing the problem of long dissolution times, thereby improving the working efficiency of the infinite-stage cementing sleeve for horizontal well fracturing.

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