Compositions and methods for water and gas shut-off in...

Earth boring – well treating – and oil field chemistry – Well treating – Contains inorganic component other than water or clay

Reexamination Certificate

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C507S271000, C507S272000, C507S276000, C166S305100

Reexamination Certificate

active

07875575

ABSTRACT:
Viscoelastic surfactant (VES) based fluid systems for zone isolation and flow control are effective in water and/or gas shutoff applications. The fluid systems may include brine, a viscosity enhancer, as well as the VES, and optionally a stabilizer for high temperature applications. The stabilizer may be an alkali earth metal oxide, alkali earth metal hydroxide, alkali metal oxide, alkali metal hydroxide, Al2O3, and mixtures thereof. The viscosity enhancer may include pyroelectric particles, piezoelectric particles, and mixtures thereof. The fluid system is easy to pump into the formation, and after pumping, the fluid system will generate very high viscosities to prevent the VES fluid from flowing back to stop undesirable water and/or gas production.

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