Casing pipe repairing and strengthening agent construction device and using method thereof

Abstract

The invention belongs to the field of oil and gas development, and relates to a special tool for casing pipe repairing and strengthening agent construction and a using method thereof. The casing piperepairing and strengthening agent construction device comprises three parts of an upper part, a middle part and a lower part, wherein the upper part, the middle part and the lower part are connected in sequence. The middle part is a cylinder body, a piston is arranged in the cylinder body, and an outlet hole is formed in the side surface, close to the lower part, of the cylinder body. Packers arearranged on the outer surfaces of the upper part and the lower part, the piston and the packers are provided with driving devices separately, and the driving devices are matched with piston and the packers. According to the casing pipe repairing and strengthening agent construction device, a suspended cement plug or a lower retrievable bridge plug is not required for blocking the bottom of a damaged part, no drilling plug process exists, the process is simple, the construction time is short, and the construction cost is low.

Description

technical field [0001] The invention belongs to the field of oil and gas development, and relates to a special tool for the construction of a casing repair reinforcement agent and a use method thereof. Background technique [0002] In the development process of oil and gas wells, it is necessary to repair and strengthen the damaged and failed casing. There is a chemical repair casing technology that injects high-strength repair and reinforcement into the damaged part of the casing. After curing, the pressure resistance of the reinforced part can be repaired. High strength, good sealing, good chemical stability and balanced mechanical properties, the repaired casing does not shrink or change in diameter. The common construction technique is to make a suspended cement plug or a fishable bridge plug at the bottom of the damaged part, and then use the prepared repair reinforcement to seal the entire section of a cylinder in the damaged part, and finally drill it after it solidif...

AI Technical Summary

Problems solved by technology

In this process, firstly, a suspended cement plug or a fishable bridge plug must be added, and an additional construction step must be added; secondly, a large amount of material is injected into the entire cylindrical section of the damaged part, which consumes a lot of material and wastes a lot; finally, it waits for repair Drill the plug after the reinforcing agent is completely cured. In order to ensure that the repaired casing does not shrink in diameter, except for the damaged part to be repaired, the entire cylindrical section inside the inner wall of the casing must be drilled, because the repairing curing agent is added. The resin body of other special materials has high strength after curing, and it is difficult to drill and grind the plug, the cycle is long, the construction cost is high, and the risk is high

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