Open-hole segmental fracturing differential pressure sliding sleeve

Abstract

The present invention provides an open-hole segmental fracturing differential pressure sliding sleeve, and belongs to devices used in the horizontal open-hole completion segmental fracturing process.The open-hole segmental fracturing differential pressure sliding sleeve comprises an outer cylinder and an inner sliding sleeve. The outer cylinder and the inner sliding sleeve are vertically arrangedand are cylinder-shaped bodies communicating up and down. The outer cylinder is arranged on the exterior of the inner sliding sleeve in a sleeving mode and fixedly connected with the inner sliding sleeve through a shear pin. The inner sliding sleeve comprises a first connecting part, a sliding part and a second connecting part which are sequentially arranged from top to bottom, the first connecting part and the second connecting part are in sealing fit with the inner wall of the outer cylinder, the height of the sliding part is greater than that of the first connecting part, the outer diameter of the sliding part is less than the outer diameter of the first connecting part, and a first step is formed at the bottom end of the first connecting part. An annular sliding cavity is formed by enclosing the sliding part and the inner wall of the outer cylinder, fracturing holes communicating with the sliding cavity are formed in the outer wall of the outer cylinder, and the end face of the top end of the inner sliding sleeve is arranged downward gradually in a inclination mode from outside to inside in the radial direction of the inner sliding sleeve. According to the open-hole segmentalfracturing differential pressure sliding sleeve, the opening success rate of existing differential pressure sliding sleeves can be effectively improved.

Description

technical field [0001] The invention belongs to a device used in the staged fracturing process of open-hole completion of a horizontal well, in particular to an open-hole staged fracturing differential pressure sliding sleeve. Background technique [0002] During the exploitation of shale gas and other tight oil and gas reservoirs, the open hole completion of horizontal wells combined with staged fracturing of horizontal wells can significantly save the time required for well completion and related construction costs, and can well prevent The cement cementing construction will cause secondary pollution damage to the reservoir, and at the same time, the staged fracturing operation time is short, which can save a lot of fracturing operation time. The sliding sleeve packer string plays a key role in the horizontal well open hole staged fracturing technology, which uses multi-stage packers to mechanically set the open hole section of the horizontal well. Sealing and isolation, ...

AI Technical Summary

Problems solved by technology

However, in the current fracturing operation, the existing differential pressure sliding sleeve often cannot be opened, which will have a negative impact on the normal operation of the entire fracturing operation, and even directly lead to failure of the fracturing operation in severe cases. failure, lower yield

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