Brine fluids having improved rheological characteristics

Details Brine fluids having improved rheological characteristics Brine fluids having improved rheological characteristics

C - Chemistry, Metallurgy

09

K

C09K 8/08 (2006.01) C09K 8/10 (2006.01)

Patent

CA 2178767

The invention provides brine based well drilling and servicing fluids which exhibit relatively thermally stable rheological and filtration characteristics. The fluids comprise a brine, an amorphous silica viscosifier, a biopolymer viscosifier, a fluid loss control additive, and a bridging agent. By utilizing both a silica viscosifier and a biopolymer viscosifier to provide the desired rheological characteristics, the fluids have enhanced thermal stability thus maintaining their suspension and hole cleaning properties over an extended temperature range.

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