| 摘要 |
Mobility control in both secondary and tertiary subterranean oil recovery processes is improved by reducing the permeability of the reservoir through injecting an aqueous solution containing salts of isocyanuric acid, (optionally also containing thickening agents), which undergoes chemical change in the reservoir to form a precipitate and thereafter displacing such aqueous solutions through the formation by injecting drive fluids. Reduction in permeability is controlled by pH, reservoir temperature, and concentration of the isocyanuric salt. Preferably, the aqueous solution is displaced a distance away from the well bore by injection of the drive fluids before precipitation occurs. Preferably the aqueous solution is preceded by a slug of controlled mobility displacing fluid, most preferably by a miscible or miscible-type displacing fluid.
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