Methods of using invertible oil external-water internal...

Details Methods of using invertible oil external-water internal... Methods of using invertible oil external-water internal...

E - Fixed Constructions

21

B

E21B 43/27 (2006.01) C09K 8/36 (2006.01) C09K 8/64 (2006.01)

Patent

CA 2469562

Methods of using invertible oil external-water internal emulsions in drilling, hydraulic fracturing, gravel packing and completion and then inverting the emulsion 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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