A chemical repair device for petroleum casing

Abstract

The invention relates to a chemical method restoring device for oil casing. According to the technical scheme, the outer wall of a center pipe is fixedly connected with a reaction auxiliary cylinder sleeve, a thermit reaction agent is contained in an inner cavity of the reaction auxiliary cylinder sleeve, and a plurality of inclined holes are formed in the outer wall of the reaction auxiliary cylinder sleeve and blocked with tin plugs. An ignition fixing sleeve, an igniter, an ignition lock ring, a combustible ball seat, a combustible sealing sleeve and a screwed plug body are sequentially mounted in an inner cavity of the center pipe from bottom to top. The ignition lock ring presses the igniter to achieve ignition, the combustible ball seat is ignited, the combustible sealing sleeve canfurther be combusted, the thermit reaction agent in the reaction auxiliary cylinder sleeve is subjected to high-temperature heating through combustion of the combustible ball seat, and a thermit reaction is triggered. The chemical method restoring device has the advantages that generated iron and aluminum oxide in a molten state enter a cavity between the center pipe and the oil well casing, a section to be restored is filled, and casing restoration is achieved; a steel ball, a lighter and the like are adopted for ignition, procedures are reduced, and the construction cost is reduced.

Description

technical field [0001] The invention relates to a repairing device for petroleum pipes, in particular to a chemical method repairing device for petroleum casing. 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 le...

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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