| 摘要 |
The present application is directed to an aqueous composition made up of an alkali metal silicate; a hardener containing at least one dibasic ester, at least one nonionic surfactant, at least one terpene or terpene derivative and optionally at least one polyalkylene glycol; and a retarder. The composition is useful for reducing the permeability in a subterranean formation, so as to reduce or prevent water flow and circulation loss of well fluids such as drilling fluids or cement.
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