Oil based compositions and method for temporarily sealing...

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

Reexamination Certificate

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C507S211000, C507S213000, C507S216000, C507S217000, C507S203000, C507S267000, C507S269000, C507S901000

Reexamination Certificate

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06887833

ABSTRACT:
The present invention provides oil based compositions and methods of using the compositions for temporarily sealing subterranean zones. The compositions are basically comprised of oil, a hydratable polymer, an organophilic clay, a water-swellable clay, and an acid soluble material such as calcium carbonate. These compositions will form a viscous gel when contacted with water. The gelled mass may then be dissolved with an acidic fluid, such as 15% hydrochloric acid.

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