Separable hydraulic sliding sleeve for oil and gas wells

Abstract

The invention discloses a separable type hydraumatic sliding sleeve for an oil gas well. The hydraumatic sliding sleeve comprises an upper joint, a lower joint, a ball seat, a releasing elastic claw, an anti-rotation connecting cylinder and a limiting tube, wherein the upper joint is fixedly connected with the releasing elastic claw; the ball seat and the limiting tube are fixedly connected to form a moving element; the moving element is fixed in the inner cavity of the releasing elastic claw through a safety shear pin; the releasing elastic claw comprises a hollow cylindrical section and an elastic claw piece section formed by encircling a plurality of elastic claw pieces; one end of the anti-rotation connecting cylinder is fixedly connected with the lower joint; the releasing elastic claw is positioned between the anti-rotation connecting cylinder and the limiting tube; a groove for accommodating the elastic claw piece section is formed in the outer wall of the limiting tube; an elastic claw oblique plane is arranged at the tail end of the releasing elastic claw; a step inner oblique plane matched with the elastic claw oblique plane is arranged on the inner wall of the anti-rotation connecting cylinder. Through the adoption of the separable type hydraumatic sliding sleeve, when a tool pipe column cannot be taken out after the production capacity-increasing revamp of the stratum, the separation of a feed-in oil tube and a completing tool is achieved through pressure building by ball throwing at the well opening, further the feed-in oil tube can be conveniently and quickly taken out, and the purpose of upper shaft operation is achieved.

Description

technical field [0001] The invention relates to a hydraulic sliding sleeve used for oil and gas wells, belonging to the technical field of downhole tools in the oil and gas industry. Background technique [0002] At present, the conventional production stimulation operation method of oil and gas wells is to connect the completion tools with the tubing and run them into the oil and gas wells to complete the acidification or fracturing of the formation to achieve the purpose of production stimulation. When the tool string in the well needs to be taken out after formation stimulation or oil and gas recovery, due to the influence of complex downhole conditions, the tool string cannot be taken out, which will affect the secondary operation of the wellbore. [0003] For example, the publication number is CN104481491A, and the publication date is April 1, 2015. The Chinese patent document discloses a loop control type casing sliding sleeve closing tool, including a body, a hydrauli...

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Problems solved by technology

[0004] However, the existing technology represented by the above-mentioned patent documents still cannot realize the separation of the oil tubing and the completion tool. Therefore, it is necessary to design a downhole device to realize the separation of the oil pipe and the completion tool, so that when the tool string cannot be taken out, through the device Complete separation of the tubing from the completion tool to remove the upper tubing

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