Underseal opening type full-bore cementing sliding sleeve

Abstract

Provided is an underseal opening type full-bore cementing sliding sleeve. The underseal opening type full-bore cementing sliding sleeve comprises an upper joint, a lower joint, a central pipe, a rupture cylinder, a sliding sleeve, an inner cylinder, and an outer cylinder, the upper end and the lower end of the central pipe are respectively connected with the upper joint and the outer cylinder, the bottom end of the outer cylinder is connected with the lower joint, the central pipe is connected with the sliding sleeve via a shear pin, the upper end of the inner cylinder is connected with the sliding sleeve, the lower end of the inner cylinder is tangent to the lower joint and can slide along the lower joint, a sidewall of the central pipe is provided with a fracturing hole, the outside of the central pipe is provided with the rupture cylinder capable of sealing the fracturing hole, a containing cavity used for fixing a snap ring is formed between an inner side surface of the outer cylinder and the central pipe, the snap ring is embedded into the containing cavity, the outside of the inner cylinder is provided with a groove matched with the snap ring, and the distance from the groove to the snap ring is greater than the distance from the top end of the sliding sleeve to the lower edge of the fracturing hole. According to the underseal opening type full-bore cementing sliding sleeve, the sliding sleeve can be opened via lower falling of a packer string in a shaft, the sliding sleeve is communicated with an oil gas layer, the operation is convenient and reliable, full bore in the shaft is realized, and convenient conditions are provided for the subsequent construction operation.

Description

technical field [0001] The invention relates to tools required for fracturing operations in the technical field of oil and gas field exploitation, in particular to a bottom-sealed open-type full-diameter cementing sliding sleeve. Background technique [0002] With the promotion and application of staged fracturing technology, sliding sleeve tools are more and more widely used in oil and gas fields, and the normal opening operation of sliding sleeve tools will directly affect the smooth progress of staged fracturing operations. There are two common opening methods for cementing sleeves: mechanical opening and ball-throwing opening. The mechanically open cementing sliding sleeve can ensure the full diameter of the casing, but it is necessary to close all the sliding sleeves in the lower layer when constructing the upper layer, and special tools are required to open and close the sliding sleeves; The post-tool sealing requirements are higher, which increases the difficulty of ...

AI Technical Summary

Problems solved by technology

However, after the construction of the pitching sliding sleeve is completed, for the sliding sleeve whose ball seat cannot be fished, the more layers there are, the smaller the diameter of the ball seat is, and the full diameter in the pipe string cannot be realized.

If the sliding sleeve and the ball in the well are removed by drilling and removing operation, the pipe sticking phenomenon is easy to occur, the efficiency is low, the operation cost is high, and it is difficult to make the downhole pipe string form a full diameter

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