Horizontal well staged fracturing sliding sleeve opening-closing tool

Abstract

The invention relates to a horizontal well staged fracturing sliding sleeve opening-closing tool which mainly comprises an upper connector, a lower connector, a compression spring, a spring sleeve, a connection sleeve, a core shaft, a protective sleeve, a clamping jaw, a spray head and the like. The two ends of the core shaft are connected with the upper connector and the lower connector respectively. The upper connector and the lower connector can be in threaded connection with a coiled tubing. The upper connector and the lower connector can also be connected with the spray head. The clamping jaw can be opened through hydraulic force, an opening-closing type fracturing sliding sleeve is opened and closed through the clamping jaw, and the clamping jaw can be retracted through resilience of the spring after the opening-closing action is finished. Even though on the condition that the clamping jaw cannot be normally retracted when a sand clamp or the spring loses efficacy, hydraulic force can also be used for clipping a safety pin to retract the clamping jaw in a forced mode, and the reliability of the tool is greatly improved. In addition, settling sand in the fracturing sliding sleeve can be removed by rotating the spray head, foreign matter such as sand gravels can be effectively prevented from limiting sliding of the sliding sleeve, and operation success rate is improved.

Description

technical field [0001] The invention belongs to the technical field of fracturing in oil and gas fields, and relates to a sliding sleeve switch tool for segmental fracturing of horizontal wells. Background technique [0002] At present, in the staged multi-stage fracturing process of horizontal wells, various downhole sleeve tools connected with oil casings are used. The method is to use packers and sliding sleeves to isolate the horizontal well section into For several sections, the sliding sleeve is opened by throwing a ball during fracturing construction, and targeted construction is carried out; after the fracturing construction is completed, the opened sliding sleeve outlet is used as a channel for oil and gas to enter in the later stage. [0003] In this method, the sliding sleeve remains open after the fracturing operation is completed. However, during the production of horizontal wells, premature water, gas, and sand production are prone to occur in the wellbore, res...

AI Technical Summary

Problems solved by technology

[0003] This method keeps the sliding sleeve open after the fracturing operation is completed. However, during the production of horizontal wells, premature water, gas, and sand production are prone to occur in the wellbore, resulting in serious problems such as reduced productivity of oil and gas fields.

At the same time, the current domestic switch tools have problems such as the inability to achieve precise positioning and the inability to close the sliding sleeve when encountering sand production sections.

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