Plugging high permeability earth strata

Details Plugging high permeability earth strata Plugging high permeability earth strata

E - Fixed Constructions

21

B

166/16

E21B 33/13 (2006.01)

Patent

CA 1057648

PLUGGING HIGH PERMEABILITY EARTH STRATA Abstract of the Disclosure A method is provided allowing close control of the steam back pressure in a highly permeable formation during the temporary plugging of the formation using foam produced by introducing steam and a foaming agent into the formation forming a foam having a steam as its gaseous phase which collapses upon condensation of the steam. The method comprises intermit- tently interrupting the steam flow into the formation to inject a slug of surfactant dissolved or dispersed in a solvent such as water, oil or alcohol.

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