Thin-wall expansion pipe device and working method thereof

Abstract

The invention relates to a thin-wall expansion pipe device and a working method thereof. The thin-wall expansion pipe device and the working method thereof are applied to the technical field of petroleum industry drilling and completion and well repair. The device comprises an expansion pipe, an expansion cone, a hydraulic cylinder mechanism and an anchoring mechanism. The hydraulic cylinder mechanism is arranged above the expansion cone, and the anchoring mechanism is arranged below the expansion cone. A hydraulic cylinder sleeve of the hydraulic cylinder mechanism is fixedly connected with the expansion cone. A center pipe of the hydraulic cylinder mechanism is sleeved with the expansion cone to form sliding connection, the lower end of the center pipe is connected with the anchoring mechanism, and the lower end of the center pipe or the lower end of the anchoring mechanism connected with the center pipe is closed. A bearing pull ring is arranged outside the upper end of the expansion pipe, the outer diameter of the bearing pull ring is larger than the inner diameter of the expansion pipe, the center pipe is sleeved with the bearing pull ring, and the bearing pull ring and the center pipe are fixedly connected. Due to the fact that the hydraulic cylinder device is directly connected with the expansion cone through the device, when the expansion pipe is long, the center pipe above the hydraulic cylinder device can use a working tubular column, and the manufacturing cost is reduced. Meanwhile, when the hydraulic cylinder device lifts the expansion cone by a stroke, the hydraulic cylinder device can be reset by enabling the working tubular column to descend, and operation is convenient.

Description

technical field [0001] The invention relates to the technical field of well drilling, completion and workover in the petroleum industry, in particular to a thin-wall expansion tube device and an operation method thereof. Background technique [0002] The solid expansion tube technology developed in the 1990s has played an important role in the field of drilling, completion and workover technologies. [0003] The initial expansion tube technology is to use hydraulic pressure to push the expansion cone, and at the same time superimpose the lifting force of the drill pipe on the expansion cone to complete the expansion operation. [0004] Chinese patent, application number 201010106783.3, application date 2010.02.03, "expansion pipe assembly, oil well subsidy construction mechanism and construction method" discloses a device and method for repairing damaged casing by using an expansion pipe. A set of power cylinder is set on the upper part, an expansion cone is set on the lowe...

AI Technical Summary

Problems solved by technology

[0005] The deficiencies in the above-mentioned expansion tube technology are: a. The center rod is specially manufactured. When the expansion tube is longer, the center rod is correspondingly longer, and the manufacturing cost is higher

b. It is difficult to reset the hydraulic cylinder mechanism, and it is difficult for the ground operators to judge whether the hydraulic cylinder mechanism has been reset, and the operation is inconvenient

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