Inventor
DILGREN RICHARD E
US9 patents
Patents
9 patentsUS4643256AFeb 17, 1987
Steam-foaming surfactant mixtures which are tolerant of divalent ions
SHELL OIL CO81 citations94
US4488976ADec 18, 1984
Olefin sulfonate-improved steam foam drive
SHELL OIL CO63 citations94
US4393937AJul 19, 1983
Olefin sulfonate-improved steam foam drive
SHELL OIL CO89 citations94
US4086964AMay 2, 1978
Steam-channel-expanding steam foam drive
SHELL OIL CO63 citations92
US4532993AAug 6, 1985
Selective steam foam soak oil recovery process
SHELL OIL CO36 citations89
US4161217AJul 17, 1979
Hot water foam oil production process
SHELL OIL CO21 citations80
US4601336AJul 22, 1986
Process for selecting a steam foam forming surfactant
SHELL OIL CO10 citations72
US4597442AJul 1, 1986
Reservoir preflushing process for increasing the rate of surfactant transport in displacing oil with injected steam and steam-foaming surfactant
SHELL OIL CO14 citations72
US4562727AJan 7, 1986
Olefin sulfonate-improved steam foam drive
SHELL OIL CO7 citations72