Expansion tube assembly, oil well subsidy construction mechanism and construction method

Abstract

The invention discloses an expansion tube assembly, an oil well subsidy construction mechanism with the expansion tube assembly, and an oil well subsidy construction method. The disclosed expansion tube assembly comprises an expansion tube, an expansion cone, a central rod and a power cylinder, wherein the expansion cone is installed on the central rod; the power cylinder comprises a cylinder barrel and a piston; the piston rod of the piston can be respectively in sliding fit with the upper end part and the lower end part of the cylinder barrel; the piston body of the piston is installed on the piston rod and is matched with the inner wall surface of the cylinder barrel; a first pressure chamber and a second pressure chamber are formed in the cylinder barrel; the central rod is connected with the lower end of the piston rod; the expansion tube is sleeved outside the central rod and is positioned between the cylinder barrel and the expansion cone; the piston is provided with a pressurization channel; and the cylinder barrel is provided with a pressure relief vent. Compared with the existing expansion tube assembly, the expansion tube assembly disclosed by the invention does not have a pre-expansion part bearing high pressure, so that the expansion tube can have smaller thickness, the maximum diameter of the expansion cone is increased, the subsidy position has a larger drift diameter, and the influence of subsidy construction on an oil well is reduced.

Description

technical field The invention relates to an oil well subsidy technology, in particular to an expansion tube assembly, and also relates to an oil well subsidy construction mechanism with the expansion tube assembly and an oil well subsidy construction method using the expansion tube assembly. Background technique The oil well subsidy technology is a technology that uses the expansion pipe assembly to repair the damaged basic casing in the oil well to maintain the sealing performance of the oil well. Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic structural view of the expansion tube assembly in the prior art, and FIG. 2 is a schematic structural view of the expansion tube in the expansion tube assembly shown in FIG. 1 . The prior art oil well subsidy technology will be described below with reference to the accompanying drawings. The existing expansion tube assembly includes a central tube 210 , an expansion tube 220 , an expansion cone 230 , a plug 240 and a rubb...

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