Oil well casing reconditioning tool

Abstract

This invention discloses one kind of subsidy tool of oil well pipeline, comprises the smooth connection slides the set of equipment, the drill rod, mine shaft motor and inflation. States inflation above has may the radial direction migration piston. Said pisto above has cylindrical in the piston the end surface leads angle roller. When work impels the piston by the ground hydraulic system along the radial direction migration, causes roller to extrude expantion tube occurs the partial distortion, this time the mine shaft motor rotates, the impetus inflates revolves, completes inflation the circumference direction distortion, above serves with in the inflation tool upper body one to above distill pressure, but inflation completes from the top downward the distortion, tightly pastes to the drive pipe endophragm which damages, thus realizes to damages the drive pipe the subsidy. Because roller with inflation the contacted area is small, thus needs the ground hydraulic system pressure is small, inflation receives the axial force is small, its place hangs, the match installment structure is simple, suitable damages the drive pipe to various types patching.

Description

technical field [0001] The invention relates to an oil well maintenance tool, in particular to an oil well casing subsidy tool suitable for oil well casing damage repair. Background technique [0002] During the production process of the oil well, the casing is damaged due to various reasons, which brings inconvenience to the downhole operation of the oil well. At present, the subsidy method adopted after the casing is damaged is mainly the expansion pipe subsidy technology. This method is to lower the expansion tube into the damaged casing, and inside the expansion tube there is a cone with the same diameter as the expansion tube, and then push the piston through the ground hydraulic system, and the piston pushes the cone to forcefully pass through the expansion tube, making the expansion tube metal Produce plastic deformation to cling to the inner wall of the damaged casing to achieve the purpose of subsidizing the damaged casing. [0003] Using this kind of casing subsid...

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Problems solved by technology

[0003] Using this kind of casing subsidy tool, the contact between the cone and the expansion tube is surface contact, and its contact area is large. The pressure of the hydraulic system required to make the expansion tube achieve plastic deformation is high, and at the same time, the pressure generated when the expansion tube expands The axial force is large, and there are high requirements for the connection strength of the expansion tube, as well as the seat hanging and hands-free device of the expansion tube. Moreover, the diameter of the expansion tube after expansion is limited by the diameter of the cone, which is a fixed value. The sealing performance between the outer casing and the outer casing or well wall is limited, and when the shape of the outer casing or the well wall is irregular, its sealing performance will be greatly affected

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