A cementing casing or tubing sliding sleeve with unlimited segments and clusters

Abstract

The invention relates to a cementing casing or tubing sliding sleeve with unlimited sections and clusters, comprising an upper joint, a reducing sleeve, a sliding sleeve body and a lower joint, the upper joint is connected with the reducing sleeve, and the reducing sleeve is connected with the sliding sleeve. The main body is connected, the sliding sleeve body is connected with the lower joint, and the inner wall of the reducing tube is provided with grooves to form a reducing area on the inner wall of the reducing tube, and an elastic tube is installed on the reducing area; the middle part of the sliding sleeve body is evenly distributed along the circumferential direction with multiple fracturing port, the inner wall of the sliding sleeve body is provided with an expanding area, the expanding area is located below the fracturing port, the sliding sleeve body is covered with an inner sliding sleeve, and a C ring is installed at the lower end of the sliding sleeve body. , gas field vertical wells, horizontal wells with unlimited sections and infinite clusters between sections, and the full diameter of the wellbore before fracturing, no throttling of sliding sleeves and ball seats, large construction displacement, can greatly improve the fracturing effect, increase the unit Well production: after fracturing, the ball and C ring made of soluble materials are dissolved or drilled off, and the wellbore becomes full diameter again, which is convenient for 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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