Fracture acidizing sandstone formations

Details Fracture acidizing sandstone formations Fracture acidizing sandstone formations

1987-08-19

1989-02-28

Novosad, Stephen J.

Wells

Processes

Placing fluid into the formation

166308, E21B 4326, E21B 4327

Patent

active

048077038

ABSTRACT:
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.

REFERENCES:
patent: 3167123 (1965-01-01), Graham et al.
patent: 4044833 (1977-08-01), Volz
patent: 4237975 (1980-12-01), Scherubel
patent: 4453596 (1984-06-01), Conway et al.
patent: 4466893 (1984-08-01), Dill
patent: 4683068 (1987-07-01), Kucera

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