A method of using a casing repair device

Abstract

The invention relates to a using method for a casing pipe repair device. According to the technical scheme, a packer is mounted at the bottom of an oil well casing pipe, and isolating protective sandis arranged above the oil well casing pipe; the lower end of a central pipe and the inner wall of the oil well casing pipe are fixed through an oil pipe anchor, a metal packer is arranged above the oil pipe anchor, and the top of the central pipe and a wellhead device are connected and fixed; the lower portion of a centralizing short section is connected with a fire-resistant protection sleeve through a pressure balance one-way valve; and an aluminothermic reaction material is arranged in an annular cavity of the fire-resistant protection sleeve, the outer wall of the central pipe is sleeved with the fire-resistant protection sleeve, and a reaction inducing tubular column is mounted in an inner cavity of the central pipe. The using method for the casing pipe repair device has the beneficial effects that the aluminothermic reaction material in the inner cavity of the fire-resistant protection sleeve is heated through an electric heating pipe, so that the aluminothermic reaction materialis subjected to a controllable aluminothermic reaction, the damages position of the casing pipe is blocked and repaired, the problem that the inner diameters of casing pipes in an existing repair technology are different is avoided, and the problem that existing cement is leaked again is also avoided.

Description

technical field [0001] The invention relates to an oil pipe repair device and method, in particular to a method for using the casing repair device. Background technique [0002] During the exploitation of oil and gas fields, due to complex geological conditions, such as inclined wells, horizontal wells, etc., oil well casing damage often occurs. Oil well casing damage will cause the following hazards to oilfield development: 1. The production string cannot be run into the well normally; 2. When the damaged part of the casing is in the water layer or sand layer, the oil well will produce a large amount of water or sand; 3. The oil well will increase production The measures cannot be carried out; 4. It is easy to cause blowout outside the casing; 5. It causes the oil well to be scrapped. [0003] There are several methods for repairing cracked casings with seams or holes: 1. Squeeze the grout: When the pressure of the oil layer is not high and the rupture and leakage are not ...

AI Technical Summary

Problems solved by technology

The advantage of this method is to ensure the consistency of the inner diameter of the casing, and the downhole tools can pass through smoothly in future operations; the disadvantage is that the casing thread of the downhole buckle is not as tight as that on the wellhead, and the replacement of casing More expensive and more difficult to operate

[0004] Among them, the problems of the subsidy repair method are: when sand control is required, sand control pipe strings need to be run in; Fracturing pipe string; since the inner diameter of the steel pipe is smaller than the inner diameter of the casing, the diameter and specification of the running tool need to be reduced, resulting in a smaller amount of injected liquid, which affects the effects of sand control, acidizing and fracturing. In addition, the steel pipe Form a boss shape on the inner wall of the casing, so that the running string is prone to jamming

[0005] The problem with the cement-squeezing method is that when acidification is required on site, because the cement is alkaline, the acid will react with the cement, which will cause the repaired leaks to leak out again.

Images