Invert emulsion drilling fluid and process

Details Invert emulsion drilling fluid and process Invert emulsion drilling fluid and process

C - Chemistry, Metallurgy

09

K

C09K 8/36 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2407459

An invert emulsion, in which the aqueous phase includes a low concentration of potassium formate, is used in well drilling. The low concentration of potassium formate may be maintained by monitoring the potassium level in the circulating drilling fluid and/or by intermittently measuring the water activity of the drilling fluid. As an emulsifier, a reaction product of tall oil and a fatty alkanolamide may be used, optionally with an additional reaction product of tall oil with an aminoethylpiperazine.

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