A casing repair device

Abstract

The invention relates to a casing pipe repairing device. According to the technical scheme, a packer is mounted at the bottom of an oil well casing pipe, and isolation protection sand is arranged on the upper portion of the oil well casing pipe. An oil pipe anchor is mounted on the part, on the upper portion of the isolation protection sand, of the inner wall of the oil well casing pipe, the lowerend of a central pipe is fixed to the inner wall of the oil well casing pipe through the oil pipe anchor, a metal packer is arranged above the oil pipe anchor, the top of the central pipe is connected and fixed to a well opening device, a fireproof protection sleeve is connected to the lower portion of a straightening short joint through a pressure balancing single-way valve, and a thermit reaction raw material is arranged in an annular cavity of the fireproof protection sleeve. The outer wall of the central pipe is sleeved with the fireproof protection sleeve, and a reaction inducing pipe column is mounted in an inner cavity of the central pipe. The casing pipe repairing device has the beneficial effects that the thermit reaction raw material in the inner cavity of the fireproof protection sleeve is heated through an electric heating pipe, accordingly a controllable thermit reaction occurs on the thermit reaction raw material, the broken part of the casing pipe is blocked and repaired, the problem that the inner diameter of casing pipes is different in the existing repairing technology is solved, and the problem that the casing pipes can leak again through cement is solved as well.

Description

technical field [0001] The invention relates to an oil pipe repair device and method, in particular to a 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 serious, the method o...

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.

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