E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/27 (2006.01) C09K 8/516 (2006.01) C09K 8/72 (2006.01) E21B 43/22 (2006.01)
Patent
CA 2738482
A method of acidizing a subterranean formation with a diverting agent composed of a gelled or thickened viscoelastic foam or fluid generated from (i.) an amidoamine oxide gelling agent and (ii.) an acid or foam, water and/or brine. The gelled or thickened foam or fluid may be generated in-situ or introduced directly into the formation by mixing of the amidoamine oxide gelling agent and acid or foam, water and/or brine. As the acid spends, the acidizing fluid thickens. When the acid is further spent, the fluid viscosity declines eventually returning to a low viscosity state, allowing for easy cleanup. The process allows for selective acidizing of less permeable zones of the formation and more uniform stimulation of the hydrocarbon bearing formation.
Cawiezel Kay C.
Dawson Jeffrey C.
Baker Hughes Incorporated
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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