Low solids, high density fluids

Details Low solids, high density fluids Low solids, high density fluids

C - Chemistry, Metallurgy

09

K

C09K 8/08 (2006.01) C09K 8/035 (2006.01) C09K 8/10 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2167003

Disclosed are low solids, high density fluids useful as drilling, workover, and completion fluids and the like in oil and gas well operations. The fluids comprise one or more brines having a density greater than about 1500 kg/m3, a viscosifier which is a high-surface area silica, a fluid loss control additive which is preferably a starch derivative, one or more water soluble or acid soluble bridging agents, and, optionally, an alkaline buffer and a polar additive. Also disclosed is an additive for the preparation of low solids, high density fluids which comprises a fumed silica and a bridging agent in a weight ratio of bridging agent to fumed silica from about 2 to about 20, and optionally, an alkaline buffer in a weight ratio of alkaline buffer to fumed silica from about 0.03 to about 2.5.

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