Methods of drilling well bores using invertible oil...

Details Methods of drilling well bores using invertible oil... Methods of drilling well bores using invertible oil...

E - Fixed Constructions

21

B

E21B 7/00 (2006.01) C09K 8/28 (2006.01) C09K 8/36 (2006.01) C09K 8/64 (2006.01)

Patent

CA 2403079

Methods of drilling well bores using an invertible oil external-water internal emulsion drilling fluid and then inverting the drilling fluid to a water external-oil internal emulsion are provided. The methods basically comprise the steps of contacting the oil external-water internal emulsion with an aqueous acid solution containing an anionic sulfonate surfactant for preventing aqueous acid solution-crude oil emulsions and crude oil sludging and a chemical for preventing the anionic sulfonate surfactant from reacting with the emulsifier in the oil external-water internal emulsion.

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