Fluid compositions

Details Fluid compositions Fluid compositions

C - Chemistry, Metallurgy

09

K

31/24

C09K 8/36 (2006.01)

Patent

CA 1229972

ABSTRACT Drilling fluid compositions of the invert oil-based type incorporate (i) as the agent for emulsifying the brine phase in the oil phase, a block or graft copolymer of the general formula (A-COO)mB, where A and B represent polymeric components derived from a specified type of oil-soluble complex monocarboxylic acid and from a water-soluble polyalkyl- ene glycol or polyether polyol, respectively, and m is an integer at least 2, and (ii) as the agent for dispersing solid particulate matter in the oil phase a surfactant containing a C30-500 hydrocarbon chain as hydrophobic component, and a polar component adsorbable on to the particulate solid surface.

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