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

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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Details

C507S239000, C507S246000, C507S277000, C507S921000, C507S922000, C166S278000, C166S308400

Reexamination Certificate

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07125826

ABSTRACT:
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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patent: WO 98/05733 (1998-02-01), None
patent: WO 98/05735 (1998-02-01), None

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