Liner hanger

Abstract

The invention provides a liner hanger. The liner hanger comprises an expansion pipe with a hanging portion, a central pipe, an expansion cone seat, an expansion cone, a locking claw, a ball valve bottom plug and a well cementation rubber plug; the central pipe is arranged in the expansion pipe in a penetrating mode, a first annular cavity is formed between the expansion pipe and the central pipe, and through holes are formed in the side wall of the central pipe; the expansion cone seat is arranged in the first annular cavity and provided with a protrusion; the expansion cone is arranged on the expansion cone seat in a sleeving mode, and the end of the expansion cone is fixed to the upper end of the protrusion in an abutting mode; the locking claw is arranged in the first annular cavity, the end of the locking claw is fixed to the lower end of the protrusion in an abutting mode, and a second annular cavity is formed between the locking claw and the central pipe and communicated with the central pipe through the through holes; the ball valve bottom plug is provided with a fluid channel and a valve seat, the valve seat is located in the fluid channel, the end of the central pipe stretches into the fluid channel and is connected with the inner wall of the fluid channel, and the outer side wall of the ball valve bottom plug is connected with the end of the locking claw through a first shear pin; the well cementation rubber plug is connected with the ball valve bottom plug through a second shear pin; the shear strength of the first shear pin is higher than that of the second shear pin.

Description

technical field [0001] The present application relates to the field of oil and gas well cementing, in particular to a liner hanger. Background technique [0002] Liner cementing refers to the process of cementing by using a liner hanger to hang a liner on the upper casing. The liner hanger is a necessary tool for liner completion. With the development of drilling technology, drilling technologies such as deep wells, ultra-deep wells, highly deviated wells, horizontal wells, branch wells, and small hole and small gap wells are constantly emerging, as well as the rapid development of old well sidetracking technology, liner completion technology application is becoming more and more widespread. Using the existing conventional hanger to complete the liner completion of these special wells is difficult to meet the production needs, and sometimes even cause major downhole accidents. The cause of the accident is mainly caused by the unreasonable structure of the hanger. Among the...

AI Technical Summary

Problems solved by technology

Using the existing conventional hanger to complete the liner completion operation of these special wells is difficult to meet the production needs, and sometimes even cause major downhole accidents. The cause of the accident is mainly caused by the unreasonable structure of the hanger

Among them, a major problem of the existing conventional hangers is that the hangers are prone to sit and hang in advance during the casing running operation cycle, which leads to the start of the expansion operation before the cementing operation is completed.

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