A sieve sleeve annulus sand flushing string

Abstract

The invention relates to a screen annulus sand-washing tubular column. The screen annulus sand-washing tubular column is characterized in that the screen annulus sand-washing tubular column sequentially comprises an upper packing leather packer, a high-pressure sand-washing tube, a lower packing leather packer, a sliding sleeve closing tool, a sliding sleeve switch tool, a load display, and a check valve from top to bottom, wherein the upper end of the upper packing leather packer is connected with an oil tube through an oil tube buckle, the lower end of the upper packing leather packer is connected with the upper end of the high-pressure sand-washing tube through an oil tube buckle, the lower end of the high-pressure sand-washing tube is connected with the upper end of the lower packing leather packer through an oil tube buckle, the lower end of the lower packing leather packer is connected with the upper end of the sliding sleeve closing tool, the lower end of the sliding sleeve closing tool is connected with the upper end of a tubing nipple through an oil tube buckle, the lower end of the tubing nipple is connected with the upper end of the sliding sleeve switch tool through an oil tube buckle, the lower end of the sliding sleeve switch tool is connected with the upper end of the tubing nipple through an oil tube buckle, the lower end of the tubing nipple is connected with the upper end of the load display through an oil tube buckle, and the lower end of the load display is connected with the upper end of the check valve. According to the screen annulus sand-washing tubular column, work of sliding sleeve opening, sand-washing operation, well washing operation and sliding sleeve closing is completed by means of the tubular column, so that a working cycle is effectively shortened.

Description

technical field [0001] The invention relates to a sand washing pipe string, in particular to a sand washing pipe string in the annulus of a screen casing. Background technique [0002] At present, in the known production process of oil wells, due to the production of formation sand and fine particles from the formation, it is easy to block the annulus of the screen and screen casing, resulting in a decrease in permeability, resulting in a gradual decrease in oil well productivity and screen erosion damage. , the conventional sand washing string needs to be lowered into multiple trips, the operation process is relatively cumbersome, and the sand washing operation cycle is longer. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a screen casing annulus sand flushing pipe string that can be lowered in one trip and can realize sand flushing and plugging removal of the screen casing annulus. [0004] In order t...

AI Technical Summary

Problems solved by technology

[0002] At present, in the known oil well production process, due to the formation sand and fine particles produced from the formation, it is easy to block the annulus of the screen and screen casing, resulting in a decrease in permeability, resulting in a gradual decrease in oil well productivity and screen erosion damage. , the conventional sand washing pipe string needs to be lowered into multiple trips, the operation process is relatively cumbersome, and the sand washing operation cycle is longer

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