| 摘要 |
The more permeable channels in an oil producing formation are selectively plugged by the reaction in the formation of sodium silicate and a divalent cation-containing brine present in the formation. The sodium silicate reactant is separated from the formation brine by an inert spacing medium so that the precipitate is formed at a desired distance from the injection wellbore. The reactants may be caused to contact each other over a larger region of the formation by decreasing the amount of spacing medium employed during the introduction of the treating solutions.
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