Casing well cementation sliding sleeve

Abstract

The invention provides a casing pipe well cementation sliding sleeve which comprises an oil pipe body, a casing pipe body, a casing pipe body, a casing pipe body and a casing pipe body, and the oil pipe body is provided with a fracturing port; the center cylinder is installed on the oil pipe body through a shear pin and covers the fracturing port; the ball seat is fixedly connected to the central cylinder and is used for capturing the packing body; the protective rubber sleeve is mounted outside the oil pipe body, covers the fracturing port and is made of a decomposable rubber material; the expanding rubber sleeve is arranged outside the oil pipe body, and the expanding rubber sleeve and the protective rubber sleeve are distributed along the axial direction of the oil pipe body; and the hydraulic control valve device can enable the protection rubber sleeve to be communicated with the pipe cavity of the oil pipe body and enable the expansion rubber sleeve to be communicated with the pipe cavity of the oil pipe body under the condition that the pressure of the pipe cavity of the oil pipe body reaches an opening pressure value. By means of the sleeve well cementation sliding sleeve, the technical problem that it is difficult to give consideration to reduction of construction pressure and guarantee of the packing effect in a sleeve well cementation sliding sleeve is solved.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oil and gas wells, in particular to a casing cementing sliding sleeve. Background technique [0002] Unconventional oil and gas reservoirs with low permeability and difficult to produce, including tight sandstone oil and gas reservoirs, shale oil and gas reservoirs, coalbed methane, etc. Through the application of horizontal well staged reservoir stimulation technology, the development cost of unconventional oil and gas reservoirs with low permeability and difficult to be developed has been greatly reduced, the single well production has been increased, and the stable production period has been extended. [0003] Reservoir stimulation technologies mainly include bridge plug staged fracturing technology, open hole packer-sliding sleeve staged fracturing technology, hydraulic jet fracturing technology, and casing cementing sliding sleeve staged fracturing technology. Among them, the casi...

AI Technical Summary

Problems solved by technology

[0010] In some cases, special treatment measures are required, such as pumping acid liquid to dissolve part of the cement to reduce formation fracture pressure. However, pumping acid liquid will cause corrosion of the downhole pipe string and cause the risk of casing change and casing damage

[0011] In other cases, the outer diameter can be increased at the fracturing port, or the telescopic nozzle method can be used to minimize the thickness of the cement sheath that needs to be pierced at the fracturing port, so as to reduce the fracture pressure of the formation and reduce the difficulty of construction However, this method will affect the circulation of cement slurry in the wellbore and the annulus, affecting the cementing effect, resulting in channeling in the annulus after the oil and gas well is put into production, and shortening the production life of the oil and gas well

[0012] Therefore, the existing casing cementing sliding sleeve has the technical problem that it is difficult to reduce the construction pressure and ensure the isolation effect

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