Well cementation casing or tubing sliding sleeve without limit on number of segments or clusters

Abstract

The invention relates to a well cementation casing or tubing sliding sleeve without limit on the number of segments or clusters, comprising an upper joint, a variable-diameter cylinder, a sliding sleeve body, and a lower joint. The upper joint is connected with the variable-diameter cylinder, the variable-diameter cylinder is connected with the sliding sleeve body, and the sliding sleeve body is connected with the lower joint. Grooves are arranged on the inner wall of the variable-diameter cylinder to make a variable-diameter area formed on the inner wall of the variable-diameter cylinder, and an elastic cylinder is installed in the variable-diameter area. Multiple fracturing ports are uniformly distributed in the middle of the sliding sleeve body along the circumference. The inner wall of the sliding sleeve body has a diameter expanding area which is disposed below the fracturing ports. An inner sliding sleeve is arranged inside the sliding sleeve body. The lower end inside the sliding sleeve body is equipped with a C ring. With the sliding sleeve, vertical and horizontal wells in oil and gas fields can be fractured in a layered manner under the conditions of an unlimited number of segments and an unlimited number of clusters between segments. Before fracturing, a wellbore is full-pass, and the sliding sleeve and a ball seat are non-throttled. The construction capacity is larger, the fracturing effect can be significantly improved, and the production capacity of a single well can be increased. After fracturing, a ball made of soluble material and the C ring are dissolved or drilled and ground, and the well bore is full-pass again, thus facilitating later production and operation.

Description

technical field [0001] The invention relates to a cementing casing or oil pipe sliding sleeve with unlimited sections and clusters, which is suitable for the technical field of fracturing reconstruction of vertical wells, inclined wells and horizontal wells in oil and gas fields. Background technique [0002] At present, there are two main types of multi-stage fracturing methods in domestic oil and gas fields: one is to use cable perforation and mechanical packers to achieve isolation between layers, and to complete multi-stage fracturing by sequentially opening fracturing sleeves; It uses hydraulic jet fracturing tools to carry out hydraulic jet perforation, realizes interlayer isolation through hydraulic jet effect, and completes multi-stage reconstruction by jet fracturing. [0003] The above-mentioned sliding sleeves all need to use small to large sealing balls to complete the opening of each section and the isolation from the modified section. Due to the limitation of ...

AI Technical Summary

Problems solved by technology

Due to the limitation of the design size of the wellhead, wellbore, construction tubing string and tools, even if the above technologies are continuously optimized and perfected, the diameter of the tubing string decreases step by step during the fracturing process, and the sliding sleeves and ball seats of each section have throttling Affect the construction displacement; and the number of reconstruction sections is limited and the drilling and grinding operations cannot be carried out after the pipe string is not full-bore, which affects the later production and operation.

[0004] With the development of oil and gas fields, the multi-stage fracturing technology with a limited number of stages can no longer meet the needs of multi-stage fracturing for oil and gas wells

At present, the fracturing sleeve with an unlimited number of sections needs to use the pressure guiding pipeline for pressure transmission to form a ball seat, the workload of drilling is heavy, and there is a risk of leakage at the connection of the pipeline

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