Petroleum pipeline tool repair method

Abstract

The invention relates to a petroleum pipeline tool repair method. According to the technical scheme, a reaction auxiliary cylinder liner is fixedly connected to the outer wall of a center pipe, an aluminum heat reactant is mounted in an inner cavity of the reaction auxiliary cylinder liner, multiple inclined holes are formed in the outer wall of the reaction auxiliary cylinder liner, the inclinedholes are blocked through tin plugs, an ignition fixing sleeve, an igniter, an ignition locking ring, a combustible ball base, a combustible seal sleeve and a screwed plug body are mounted in an innercavity of the center pipe from bottom top to top in sequence, through the ignition lock ring, the igniter is pressed down to achieve ignition, the combustible ball base is combusted, the combustibleseal sleeve can be combusted, meanwhile, combustion of the combustible ball base can achieve high-temperature heating of the aluminum heat reactant in the reaction auxiliary cylinder liner, and the aluminum heat reaction is triggered. The method has the beneficial effects that generated molten-state iron and aluminum oxide enter a cavity between the center pipe and an oil well casing pipe, a segment to be repaired is filled, casing repairing is achieved, steel balls, the igniter and the like are adopted for ignition, procedures are reduced, and construction cost is saved.

Description

technical field [0001] The invention relates to a method for repairing oil pipes, in particular to a chemical method for repairing oil casings. 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 casing ruptures in oil wells with seams or holes: 1. Squeeze the slurry: When the pressure of the oil layer is not high and the rupture and leakag...

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.

But the problem that it exists is: the triggering of the thermite reaction is by putting into the reaction inducing pipe string, and the bottom of the reaction inducing pipe string is provided with an electric heating pipe, which is connected to the electric heating pipe at the wellhead through a cable to the aluminum alloy in the inner chamber of the refractory protective sleeve. The thermal reaction raw materials are heated, and the construction process is relatively troublesome

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