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Repair method for improving pumping rod strength

A repair method and a sucker rod technology, which are applied to drill pipes, earthwork drilling, pumps with flexible working elements, etc., can solve the problems of inability to improve the life cycle of sucker rods, waste of materials, etc.

Inactive Publication Date: 2006-05-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] At present, the sucker rods used on oil wells in domestic oil fields have to be replaced after reaching a certain service period, and the same level—that is, the same strength sucker rods are repaired. Generally, they can be downgraded for use after repairs, but such repairs The process not only wastes a lot of materials, but also cannot improve the reasonable service life of the sucker rod
Therefore, there is no effective repair method to improve the strength of the sucker rod after the repair of the sucker rod.

Method used

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  • Repair method for improving pumping rod strength

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Embodiment Construction

[0007] The technical characteristics of the present invention will be described in detail below in conjunction with practical embodiments.

[0008] In actual operation and technical implementation, the technological requirement is to first select the decommissioned low-strength sucker rods, that is, to remove the broken, excessively bent or severely corroded sucker rods; The sucker rod is degreased, that is, the oil stain on the surface of the rod body is removed with diesel oil or cleaning agent; the rod head and the rod body are inspected on the sucker rod after oil removal, that is, the rod head is inspected with magnetic particle flaw detection to check whether there is any defect on the rod head, The rod body is inspected by eddy current to check whether there is any fatigue damage on the rod body and whether there is any defect on the surface of the rod body; after the inspection, the sucker rod is repaired with a pin, that is, the screw on the rod head is repaired with a...

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Abstract

The invention discloses a restoring method of oil pumping rod rigidity in the oil exploitation technique domain, which is characterized by the following: adapting alternative quenching method to restore the oil pumping rod; improving the rod rigidity; reaching new rod rigidity level; changing the oil pumping rod from grade C to grade D; making the old oil pumping rod of grade D more than 980 MPa.

Description

technical field [0001] The invention relates to a repair method for improving the strength of a sucker rod, which belongs to the technical field of the manufacture and repair method of the sucker rod in oil production engineering. It mainly repairs the sucker rod to be repaired by alternately using quenching method to improve its strength and reach the strength level of the new rod. Background technique [0002] At present, the sucker rods used on oil wells in domestic oil fields have to be replaced after reaching a certain service period, and the same level—that is, the same strength sucker rods are repaired. Generally, they can be downgraded and used after repairs, but such repairs The process not only wastes a large amount of materials, but also cannot improve the reasonable service life of the sucker rod. Therefore, there is still no effective repair method that can improve the strength level of the sucker rod after repairing it, that is, to improve the strength of the ...

Claims

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Application Information

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IPC IPC(8): F04B53/00E21B17/00E21B43/00F04B47/02
Inventor 黄东升
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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