Anti-failure composite expansion tool for equal-borehole-diameter expansion pipe

Abstract

The invention relates to an anti-failure composite expansion tool for an equal-borehole-diameter expansion pipe. The device is composed of an adapter substitute, a central pipe A, an expansion pipe, a sizing expansion core head, a near-cone joint, a piston sleeve A, a double-female piston joint, a variable-diameter cone upper fixing ring, a variable-diameter expansion core head, a reinforcing leather cup, a variable-diameter cone lower fixing ring, a single-female joint piston, a piston sleeve B, a U-shaped fixing sleeve, a tip cone valve sleeve, a bottom plug, a conical sealing ball seat, a sealing ball, a T-shaped ball pressing device, a lower U-shaped pressing sleeve and a reciprocating spring (21). And a central pipe B, a starting pin and the like. The anti-failure composite expansion tool is characterized in that when a traditional expansion mode fails in sealing, it is guaranteed that expansion can be smoothly completed. The condition of construction failure caused by sealing failure of the expansion cone in the expansion pipe construction process is well solved, and a large amount of manpower, material resources and financial resources are saved.

Description

technical field [0001] The invention relates to an anti-failure composite expansion tool for an equal diameter expansion pipe, which belongs to the technical field of oil and gas exploitation, and in particular relates to a composite expansion tool. Background technique [0002] With the gradual increase of drilling depth, the difficulty of drilling is also increasing. Expandable tube technology is known as the moon landing project in the oil and gas industry, and its application is becoming more and more extensive. Equal diameter drilling is a new milestone in the development of expandable tube technology. Equal diameter drilling technology can solve the drilling problems of deep wells, ultra-deep wells and complex wells. It can reduce the drilling risk and improve the wellbore structure without losing the size of the wellbore and without affecting the subsequent drilling operations. At the same time, it can ensure the target Layers are drilled smoothly. The successful ex...

AI Technical Summary

Problems solved by technology

The traditional expansion method is to achieve sealing between the expansion cone and the expansion tube or the sealing between the cup and the expansion tube, but the inner wall of the expansion tube will become uneven after the large plastic deformation expands, the ellipticity of the inner diameter will increase, and the unevenness of the inner wall will also increase sharply , which in turn leads to the failure of the above-mentioned seal and the failure of the expansion, forcing the stop of the expansion. In serious cases, it is necessary to adopt the method of drilling, which wastes a lot of time and causes serious economic waste

Images