Expansion tube type liner hanger

Abstract

An expansion tube type liner hanger is applied to liner hanging construction for petroleum drilling and completion. The liner hanger mainly comprises a feeding joint, a central tube, a nut, a float valve, a releasing drum, an expansion tube, a tieback drum, an expansion cone, closure sleeves of the float valve, a drill pipe plug and a releasing top sleeve; the lower part of the feeding joint is connected with the central tube by an internal thread; the lower end of the releasing drum is connected with the upper end of a splined sleeve by a spline; the lower end of the splined sleeve is connected with the expansion tube by a thread; the outer wall of the expansion tube is provided with a ring-shaped bulge; the lower end of the expansion tube is connected with the upper end of the tieback drum; expansion device modules are connected in the tieback drum and at the lower end of the central tube; a hanging seat of a liner plug and the outer wall of the nut are provided with the closure sleeves of the float valve; the closure sleeves of the float valve are connected with the expansion cone; the closure sleeves of the float valve are connected with the nut by pins; the outer wall of the expansion tube is provided with a metal bulge; hanging and setting are completed by interference fit between the metal bulge and an outer casing tube, therefore, the liner hanger is not influenced by the gravity and slip eccentricity like the conventional liner hangers.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a special tool for hanging a well drilling and completion liner, which is a liner hanger Background technique [0002] Generally, the liner hanger used for drilling and completion is mechanical or hydraulic. After the drill pipe is connected to the liner hanger and the liner is in place, the slips on the hanger are opened and attached to the outer layer by mechanical action or hydraulic method. On the inner wall of the technical casing, the slips can hang the weight of the tail pipe. Generally, cementing is performed after the liner hanger is suspended. The current mechanical or hydraulic liner hangers can be divided into two types: sealed and non-sealed in terms of function: (1) The hanger that can realize the top seal can continue to operate after the cement injection is completed, and the deformation of the rubber parts is realized. Sealing of the hanging part; (2...

AI Technical Summary

Problems solved by technology

Whether it is a mechanical or hydraulic liner hanger, the upper part of the liner hanger is prone to failure after a certain period of service. Because the liner cement ring cannot achieve the sealing effect after a long period of time, it affects the development effect and follow-up operations.

In addition, conventional mechanical and hydraulic liner hangers are designed with more mechanical parts in the radial structure in order to meet the suspension and setting functions, resulting in a small inner diameter of the hanger, and the tool will received some restrictions

Other conventional liner hangers are difficult to set and hang in horizontal wells

Generally, the liner hanger is designed with a reverse buck

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