An accumulator-driven sliding sleeve switch for petroleum well completion

Abstract

The invention discloses an accumulator-driven sliding sleeve switch used for petroleum well completion. The sliding sleeve switch is of a cylinder structure and has an oil passage hole in annular space at the middle portion. The sliding sleeve switch comprises an electrical control part, a power source part and an action executing part. The accumulator-driven sliding sleeve switch used for petroleum well completion has following beneficial effects: a hydraulic sliding sleeve is easily operated and capable of performing on-off action of multiple sliding sleeves by inputting an electric signal at a time so that working time is greatly shortened; the sliding sleeves can be controlled to be opened and closed; as for the hydraulic sliding sleeve, power is outputted by hydraulic stored energy and controlled by a weak power source; due to storage of little electric energy, electricity storage and hydraulic energy can be conveniently integrated into the sliding sleeve; because of a relatively simple overall structure, long-distance transmission and excessively-long pipelines can be avoided; and by adoption of an accumulator as a power source, defects such as complicated structure, too many parts, small overall dimensions, difficulty in model selection and design and relatively low reliability are solved.

Description

technical field [0001] The invention relates to a downhole sliding sleeve, in particular to a hydraulic sliding sleeve switch for staged fracturing completion of a horizontal well. Background technique [0002] With the depletion of global oil and gas energy reserves, how to economically and effectively develop low-permeability reservoirs and unconventional oil and gas reservoirs has become a top priority. Therefore, the key technology for exploiting oil reservoirs—horizontal well staged fracturing completion technology has become the key to research. The sliding sleeve tool is the core component of multi-stage sliding sleeve staged fracturing completion technology for horizontal wells, and the opening and closing performance of the completion sliding sleeve directly determines the completion effect. [0003] At present, ball-type sliding sleeves are widely used, but there is a difference in the diameter of the sliding sleeves at each level, and the number of fracturing sta...

AI Technical Summary

Problems solved by technology

[0003] At present, ball-type sliding sleeves are widely used, but there is a difference in the diameter of sliding sleeves at all levels, and the number of fracturing stages is limited, which is not conducive to oil reservoir development; at the same time, the operation of the horizontal section is difficult and the efficiency is not high

Another all-electrically driven sliding sleeve switch tool uses a multi-core cable to realize power transmission, which avoids unfavorable factors such as difficulty in arranging multiple hydraulic control pipelines, difficulty in passing through packers, and many downhole sealing points. The sliding sleeve switch tool of the method is not suitable for long-distance transmission, and the installation space takes up a lot

There is also a form of motor + pump, the overall system has many pipelines, and the number of control points is limited by the space, so it is impossible to realize the distributed control strategy

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