| 摘要 |
More permeable zones in subterranean formations in fluid communication with a well can be partially or completely plugged by injecting solutions of compounds which precipitate over a period of time, e.g., aqueous solutions of isocyanuric acid and its substituted derivatives, so as to decrease the permeability to a controlled extent. This permits secondary recovery of oil-in-place without excessive flow of displacing fluids through the originally more permeable zone.
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