Curable leak-stopping agent

Abstract

The invention relates to a curable leak-stopping agent. The curable leak-stopping agent comprises the following components which are mixed by weight percentage: 30 to 50 percent of curable material blast furnace, 5 to 15 percent of high filtration material diatomite or fly ash, 15 to 25 percent of fibrous material asbestos fiber, cotton fiber or cob, 2 to 5 percent of soft elasticity expansion material elastic tyre rubber and 20 to 30 percent of acid-soluble material calcium carbonate. The leak-stopping agent provided in the invention can be used independently. The curing time is controllable; the leak-stopping efficiency is high and the leak-stopping agent does not discriminate leakage layer apertures or crack dimensions. The leak-stopping agent is an efficient and curable leak-stopping agent which can be used to stop crack leakage and cave nonreservoir and reservoir leakage.

Description

technical field [0001] The invention relates to a leak-stopping agent for petroleum drilling engineering, in particular to a novel high-efficiency intelligent curable leak-stopping agent. Background technique [0002] Lost circulation is one of the ubiquitous technical problems in the drilling process. The occurrence of lost circulation will lose a large amount of drilling fluid materials, consume drilling time, and may cause a series of complex accidents such as pipe sticking, blowout, and well collapse, resulting in major economic losses. . [0003] At present, the compound plugging agent is still the main method for treating the leakage of medium and small fractures. This plugging agent is highly dependent on formation voids or fractures. plugging effect. To deal with large cracks and karst cave leaks, chemical methods are mainly used, and chemical plugging agents such as cement, resin and self-cementing with curing properties are used for plugging. During the process ...

AI Technical Summary

Problems solved by technology

During the process of cement plugging, the cement slurry is not easy to stay in the lost channel, and the plugging often fails due to leakage into the deep formation. Moreover, due to the solidification characteristics of the cement slurry, the injection time must be strictly controlled, and the construction is difficult; while the resin is It can only be cured within a specific temperature range, the use temperature range is narrow, and compared with other plugging agents, the cost is higher and the construction is difficult

However, some new self-cementing plugging agents have a long curing time and are not easy to control. After plugging, they have a greater impact on the performance of drilling fluids. When used alone, the plugging effect is not very satisfactory, and they often need to be used together with other composite materials.

At the same time, most lost circulation plugging agents have low acid solubility and have potential damage to the reservoir, so they are not suitable for use in the lost zone of the same layer as the reservoir.

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