| Patent Number |
Title Of Patent |
Date Issued |
| 4643256 |
Steam-foaming surfactant mixtures which are tolerant of divalent ions |
February 17, 1987 |
| In a steam-foam-displacement of oil within a reservoir formation having a significant ion-exchange capacity for releasing multivalent cations, the rate of the steam foam propagation is increased by injecting a mixture of steam and a steam-foaming surfactant mixture comprising an independ |
| 4601336 |
Process for selecting a steam foam forming surfactant |
July 22, 1986 |
| A steam-foam-forming surfactant effective for displacing the oil in a particular reservoir is selected by comparing the capabilities of foams formed by different surfactants for both flowing preferentially into permeable porous materials which contain that reservoir oil and displacing |
| 4597442 |
Reservoir preflushing process for increasing the rate of surfactant transport in displacing oil |
July 1, 1986 |
| In a process in which steam and steam-foaming surfactant are injected into a subterranean reservoir having significant cation-exchange capacity, the rate of transport of the steam-foaming surfactant is increased by a prior injection of an aqueous liquid solution of surfactant and monoval |
| 4562727 |
Olefin sulfonate-improved steam foam drive |
January 7, 1986 |
| Steam mobility-reducing capability of an olefin sulfonate-containing surfactant formulation for reducing the mobility of steam of a selected quality within a selected subterranean oil-containing reservoir is tested. Steam of the selected quality and a steam-containing fluid which has |
| 4532993 |
Selective steam foam soak oil recovery process |
August 6, 1985 |
| In a steam soak oil recovery process in a heavy oil reservoir which is susceptible to gravity override, improved results are obtained by injecting the steam in the form of a steam-foam-forming mixture which has a chemical selectivity for being more mobile within the reservoir in cont |
| 4488976 |
Olefin sulfonate-improved steam foam drive |
December 18, 1984 |
| A steam foam drive process for displacing oil within a subterranean reservoir is improved by injecting into the reservoir a steam-foam-forming mixture of steam, and an olefin sulfonate-containing surfactant component. |
| 4393937 |
Olefin sulfonate-improved steam foam drive |
July 19, 1983 |
| A steam foam drive process for displacing oil within a subterranean reservoir is improved by injecting into the reservoir a steam-foam-forming mixture of steam, and an olefin sulfonate-containing surfactant component. |
| 4161217 |
Hot water foam oil production process |
July 17, 1979 |
| A relatively viscous oil is produced from a subterranean reservoir by establishing a channel of preferential permeability through the reservoir between injection and production locations, then flowing through the reservoir a hot foam of aqueous liquid, noncondensable gas and surfactant, |
| 4086964 |
Steam-channel-expanding steam foam drive |
May 2, 1978 |
| In a viscous oil reservoir in which the stratification of the rock permeability is insufficient to confine steam within the most permeable strata, oil can be produced by forming and expanding a steam channel through which steam is flowed and oil is produced. Steam is injected and flu |
