Hydraulic expansion hanger for expandable screen pipes

Abstract

The invention discloses a hydraulic expansion hanger for expandable screen pipes, which consists of a hanger body, rubber, a sealing diameter-variable buckle, a central light pipe, an object-falling prevention plug, an expansion cone, a fixed pup joint, a pressure transfer hole and a sealing end cap. The hydraulic expansion hanger is characterized in that: the expansion cone axially moves from top to bottom along the central pipe under hydraulic action to radially plastically deform an expansion sleeve and compress the rubber between the outer wall of the expansion sleeve and the inner wall of an outer-layer sleeve so as to realize the function of hanging sealing. The invention has the advantages that: the hydraulic expansion hanger integrates the functions of a tail pipe hanger and a tail pipe upper packer; during expansion, the lower part of the hanger can be sealed by the movable end cap, and when released, the expandable screen pipe is directly pulled out of an inner pipe string without back-off; after the expandable screen pipe is released, plug drilling is not needed, and the drift diameter of the hanger is much greater than that of the conventional hanger, so well production and post-borehole operation are benefited; and the hanger can hang screen pipes or the expandable screen pipes, is applied to the sand control completion of the screen pipes, shortens a completion period, saves completion cost and has vast market application prospect and development potential.

Description

technical field [0001] The present invention is a hydraulically expandable hanger for expanding screens. technical background [0002] With the development of screen sand control completion technology, in recent years, some well-known foreign oil completion companies such as Weatherford have developed and perfected a new type of liner—expandable screen. The specific method is to use a large-diameter hanger to hang the expandable screen. The pipe is lowered into the production layer, and after the hanger is installed, the expandable screen is expanded with a variable diameter expansion tool, and the expanded screen is tightly attached to the well wall. Theoretical research and production practice have shown that the ideal condition for the effective sand control string in early completion is that the closer to the well wall, the better the sand control effect. The operation cost of using expansive sand control screen is obviously less than that of traditional sand control op...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the traditional hanger cannot meet the use requirements of the expansion screen, expand the use range of the hanger, and improve the performance of the hanger, it is necessary to develop a new type of hanger to meet the needs of the site

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