Method for drilling a well through unconsolidated dolomite forma

Boring or penetrating the earth – Processes – Boring with specific fluid

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166292, E21B 33138

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active

041203690

ABSTRACT:
A method for drilling a well through a subterranean formation containing one or more zones of unconsolidated dolomite, wherein the drilling operation is interrupted periodically to consolidate the newly drilled incompetent dolomite by the injection of a sequence of reactant slugs comprised of (I) an aqueous solution containing an acid, a surface active agent and a precipitating agent for silicates, (II) an aqueous solution containing a water-soluble silicate, and (III) an aqueous solution containing a precipitating agent for silicates.

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