Expandable liner drilling device and its operating method

Abstract

The invention relates to an expansive tail pipe drilling operation device and an operation method thereof. The device mainly comprises a tail pipe drilling assembly, a tail pipe connecting and starting assembly and a tail pipe expansion assembly. The tail pipe drilling assembly comprises a dual-core reaming bit, a float collar, a ball seat, a sealed central pipe and the like. The tail pipe connecting and starting assembly is mainly composed of a sealed central pipe, a splined shaft, an expansion cone, a hollow reaming bit, a locking short section, an expansion starter and other parts. The tail pipe expansion assembly is mainly composed of an expansion sleeve, an expansion hanger, an expansion pipe socket, a sealed rubber barrel, a central pipe, a mud blocking device, a pipe socket stop block and the like. By means of the operation device and the operation method, tail pipe expansion operation can be achieved while tail pipe drilling operation is achieved, the inner diameter of a completed well is increased, accordingly, the problems of loss, an unstable borehole and the like are solved, downhole accidents are decreased, the drilling safety is improved, and the drilling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling and completion in the oil and gas industry, in particular to an expandable liner drilling operation device and its operating method, which can realize liner drilling operations and expansion casing expansion operations after drilling in a single trip . Background technique [0002] In traditional oil and gas field drilling operations, the casing operation is carried out after the drilling operation. After the target layer is drilled, it is necessary to perform operations such as short tripping and well drilling to ensure that the casing is run in place smoothly. During the casing running process, there may be complex situations such as blowout and casing string not in place. In order to reduce the downhole complex situation and save the drilling cycle, the casing drilling technology has been developed, which can ensure that the casing is run in while drilling, which can effectively save the dril...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems faced by the existing liner drilling, an expandable liner drilling operation device was invented, which organically combines the expandable casing technology with the liner drilling technology, so that the entire drilling operation can be carried out after the liner completes the drilling operation. The liner expansion operation can avoid problems such as differential pressure sticking and drilling fluid loss under complex geological conditions; the invention also relates to a method for implementing the expansion liner drilling operation using the device

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