Expansion liner hanger

Abstract

The invention relates to the technical field of liner hangers for well cementing and completion in an oil and gas field, in particular to an expansion liner hanger, which comprises an upper joint, a connecting sleeve, a bypass valve, a ball seat, a tieback cylinder, a center pipe, a reflow member, an expansion pipe and a lower joint; wherein the outer side of the upper part of the upper joint and the inner side of the upper part of the connecting sleeve are fixedly arranged together, the inner side of the lower part of the connecting sleeve and the outer side of the upper part of the bypass valve are fixedly arranged together, a first seal cavity is formed among the upper joint, the connecting sleeve and the bypass valve, and a hole communicating with the seal cavity is formed on the upper joint. The expanded liner hanger disclosed by the invention is reasonable and compact in structure and convenient to use; an expansion cone is made descend through hydraulic pressure to extrude the expansion pipe to expand along the radial direction and joint on the inner wall of an outer-layer casing pipe, and the expansion liner hanger is pressed downwards and lifted upwards to separate a releasing sleeve and a claw sleeve, so that the safety effective operation of the expansion liner hanger and the effective implementation of the well cementing and completion operation can be ensured; and the expansion liner hanger has a simple structure and is convenient to operate and increased in safety and reliability.

Description

technical field [0001] The invention relates to the technical field of liner hangers for well cementing and completion in oil and gas fields, and relates to an expanding liner hanger. Background technique [0002] In cementing and completion operations, the use of liner hangers is currently the most widely used and most common technical measure. However, the liner hanger currently used in the field has the problem of poor cementing quality in the overlapping section of the liner, and with the increasing number of special wells such as deep wells, ultra-deep wells, and horizontal wells, the well conditions are more complicated. Under these harsh well conditions, conventional liner hangers often fail to sit or set, which seriously affects the final well completion effect; The size of the wellbore is limited during the operation, which will affect the technical measures such as subsequent workover and lower oil production pumps, and bring inconvenience to the subsequent operat...

AI Technical Summary

Problems solved by technology

[0003]The present invention provides an expandable liner hanger, which overcomes the shortcomings of the above-mentioned prior art, and can effectively solve the problem of cementing in the overlapped section of the liner in the existing device Poor quality, failure of setting or setting often occurs in poor well conditions, and restrictions on hole size in subsequent downhole operations after setting

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