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US 2013/0153232 A1Published application
Methods and compositions for reducing permeability of a subterranean formation
AssigneeCalfrac Well Services Ltd.
InventorsDwight Bobier, Ronald Pierce
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Abstract
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.
Claims20
An aqueous composition for reducing the permeability of a subterranean formation by formation of a silica gel;
- the composition comprising:
- an alkali metal silicate;
- a hardener comprising at least one dibasic ester, at least one non-ionic surfactant, at least one terpene or terpene derivative and optionally at least one polyalkylene glycol;
- a retarder;
- and
- water.
3 more elements
Dependencies are inferred from the claim text.