Lining used on gravel filling tools

Abstract

The invention relates to a sand prevention tool for oil exploitation wells, in particular to a lining used on gravel filling tools. According to the invention, the lining used on gravel filling tools comprises a lining slide sleeve, a slide sleeve outer cylinder and a positioning pipe which are sequentially connected from the inside out, wherein a shear ring is connected with the lower end of the slide sleeve outer cylinder; a shear pin is arranged on the shear ring; the lower end of the shear pin is fixedly connected with the lining slide sleeve; the lower end of the limit pipe is movably connected with a fixture block; the upper end of the limit pipe is connected with a limit locking piece; the limit locking piece is movably connected with a limit cylinder; and a groove fitted with the fixture block is formed in the lining slide sleeve. According to the invention, the lining used on gravel filling tools adopts a technical proposal in which the lining slide sleeve, the outer barrel of the slide sleeve and the limit pipe are fitted with one another, so that not only can the gravel filling job be accomplished, but also the lining used on gravel filling tools can be recycled, while the lining is fitted with a lining sealing tube thereof, therefore, returning fluid generated during the filling job as well as backwash fluid generated during the backwashing job can be prevented from getting into the stratum, and the stratum can be prevented from pollution.

Description

technical field [0001] The invention relates to a sand control tool for oil exploitation wells, in particular to a bushing used for a gravel filling tool. Background technique [0002] As crude oil flows from the formation into the wellbore, it carries some sand particles into the wellbore. In order to prevent sand production in oil wells, on the one hand, it is necessary to correctly select cementing and completion methods according to the conditions of oil layers and oil wells, formulate reasonable production measures, and improve the management level; on the other hand, according to the specific conditions of oil layers, oil wells and sand production Corresponding sand control methods. The current sand control methods mainly include mechanical sand control, chemical sand control, casing external expansion packer sand control, gravel packing sand control and other methods. [0003] Among the existing gravel packing methods, single-layer sand control and layer-by-layer sa...

AI Technical Summary

Problems solved by technology

[0003] In the existing gravel filling method, the method of single-layer sand control and layer-by-layer sand control is generally used to carry out multi-layer gravel filling. On-site operations need to be lowered into tools many times, the operation cycle is long, the labor intensity of the operator is high, and the speed of sand control operations is slow. High energy consumption and high cost

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