Intelligent gel particles capable of being crosslinked again under stratum condition and preparation method and application of intelligent gel particles

Abstract

The invention relates to intelligent gel particles capable of being crosslinked again under a stratum condition and a preparation method and application of the intelligent gel particles. The intelligent gel particles are prepared by acrylamide, anionic monomer, cationic monomer, N, N-vinyl pyrrolidone, pH regulator, initiator, cross-linking agent I, cross-linking agent II, stabilizer, nano particle material and water. The intelligent gel particles are applicable to oil field profile control and water plugging, filtration loss control and / or plugging during a drilling process and drilling and completion plugging, and the gel particles can be crosslinked again under the stratum condition after entering a stratum to form high-strength gel so as to achieve effective plugging.

Description

technical field [0001] The invention relates to an intelligent gel particle which can be recrosslinked between particles under formation conditions, a preparation method and application thereof, and belongs to the technical field of oil field chemistry. Background technique [0002] Reservoir heterogeneity is the most important reason for low oil recovery and oil well water production, and a large amount of injected water scours aggravates reservoir heterogeneity. As the water injection development of many oilfields enters the period of high water cut and extremely high water cut, water production has always been a serious problem. A large amount of water from oil wells leads to serious corrosion, increased equipment load, environmental pollution, etc., and even forced to shut down the well. Treatment of formations with gels, which can reduce the permeability of high-permeability zones, has long been considered a cost-effective way to reduce reservoir heterogeneity. Usuall...

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Problems solved by technology

[0004] Although the above-mentioned existing pre-crosslinked gel particle control and flooding technology has achieved good results in reducing water production and improving oil recovery in mature oilfields, with the popularization and application of gel particles, some technical defects and application limitations have also It appears, for example, that millimeter-sized particles can reduce high-permeability bands, fractures, water flooding, and CO 2 However, due to the limitation of particle size and the plugging characteristics of the particles themselves, they cannot effectively block the high-permeability fractures and holes; if the expansion multiple of the particles is too large, their Reduced mechanical strength, easy to break, affecting its precipitation effect

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