Expansion hanger

Abstract

The invention relates to the technical field of hanging and expanding devices for cementing of wells in oil drilling, in particular to an expansion hanger. The expansion hanger comprises an expansion pipe, a switching barrel, a single-current valve seat, a guide shoe, an expansion device, a salvageable setting device and a single-current control device, wherein the expansion device is arranged in the expansion pipe; the expansion pipe comprises a diameter expansion pipe, a frustum-shaped oblique pipe neck and a body of which the outer diameters increase in sequence from top to bottom; a vulcanized rubber ring is fixed on the upper outer wall of the diameter expansion pipe, or at least two circles of vulcanized rubber rings are fixed on the upper outer wall of the diameter expansion pipe from top to bottom; the lower end of the body is fixedly arranged together with the upper end of the switching barrel; the inner diameter of the switching barrel is the same as the inner diameter of the body; and the salvageable setting device is arranged in an inner cavity between the lower part of the body and the switching barrel. Under the condition that the drift diameter loss of a shaft of an oil-gas well, hanging and sealing are realized through expansion and cold drawing deformation of tubular products, high reliability is achieved, sealing does not fail easily, and hanging and well cementing operation of a tail pipe is completed safely and rapidly.

Description

technical field [0001] The invention relates to the technical field of a suspension expansion device for well cementing in petroleum drilling, and relates to an expansion type hanger. Background technique [0002] In the completion string structure of oil wells such as horizontal wells, directional wells, and sidetracked horizontal wells, the hanger is the most important link. The conventional hanger is mechanically suspended, squeezed and sealed, and the suspension and seal are prone to failure. The exploitation of oilfields brings troubles; and the diameter of conventional hangers is small, especially after sidetracking wells use conventional hangers, which limits the later development measures of oil wells; in order to effectively repair casing damage wells or complex accidents that cannot be handled by fishing and milling processes Wells are usually sidetracked through windows, and cemented and completed with a small-sized liner; The matching of injection-production too...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an expandable hanger, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problems that the seal of the conventional hanger is easy to fail and the inner diameter of the tail pipe is small, which brings trouble to the operation

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