Wells – Processes – Separate steps of fracturing or attacking formation
Patent
1979-07-30
1980-11-11
Novosad, Stephen J.
Wells
Processes
Separate steps of fracturing or attacking formation
166291, 166273, 166292, 166305R, E21B 3316, E21B 4316, E21B 4327
Patent
active
042327415
ABSTRACT:
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 controlling 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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patent: 3330346 (1967-07-01), Jacobs et al.
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patent: 3464491 (1969-09-01), Froning
patent: 3491832 (1970-01-01), Raza
patent: 3612179 (1971-10-01), Anderson et al.
patent: 3815681 (1974-06-01), Richardson
patent: 3893511 (1975-07-01), Root
patent: 4026361 (1977-05-01), Knapp et al.
Berkshire David C.
Lybarger James H.
Reisberg Joseph
Richardson Edwin A.
Scheuerman Ronald F.
Novosad Stephen J.
Shell Oil Company
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