Temporarily plugging a subterranean reservoir with a...

Details Temporarily plugging a subterranean reservoir with a... Temporarily plugging a subterranean reservoir with a...

E - Fixed Constructions

21

B

31/14, 166/22

E21B 33/16 (2006.01) C09K 8/518 (2006.01) C09K 8/94 (2006.01) E21B 43/26 (2006.01)

Patent

CA 1145246

A B S T R A C T TEMPORARILY PLUGGING A SUBTERRANEAN RESERVOIR WITH A SELF-FOAMING AQUEOUS SOLUTION Portions of a subterranean reservoir are temporarily plugged by injecting an aqueous liquid solution which contains nitrogen gas-generating reactants, a foaming surfactant and a pH-con- trolling system arranged so that the solution remains relatively unreactive within the well but forms a relatively immobile foam within the pores or other openings within the reservoir formation.

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