| 摘要 |
A process for acid treating a formation where a gelled and foamed acid pre-flush solution is utilized. Said pre-flush is injected into the formation under conditions and pressures sufficient to fracture said formation. Thereafter, a foamed acid solution is directed into the gelled and foamed acid pad. The resultant viscosity contrast causes the foamed acid to "finger" through said pad and unevenly etch the fracture face. "Fingering" of the foamed acid through said pad causes it to propagate substantially further into the formation than with existing sandstone acidizing processes.
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