Imparting in situ stability to displacing fluids. [93. 69 recovery]

Patent · Mon Sep 20 00:00:00 EDT 1971

OSTI ID:7301254

Jones, S C

Injecting a preslug containing electrolyte and semipolar compound ahead of the displacing fluid in secondary recovery improves the recovery up to such an extent that 93.6 percent of the crude left in the core can be recovered. In laboratory tests on Berea sandstone cores, the preslug consisted of 18,000 ppm NaCl dissolved in distilled water and containing one or two percent isopropanol. The micellar slug consists of ammonium petroleum sulfonate surfactant, isopropanol cosurfactant, straight-run gasoline, and water containing 9,000 ppm salt. A mobility buffer comprised of Dow Pusher 530, sodium chloride, and NH/sub 4/SCN follows the micellar slug, and all fluids plus the resulting oil are displaced through the formation by a drive fluid which can be either hydrocarbon or aqueous.

• Assignee: Marathon Oil Co.
• Patent Number(s): US 3605895
• OSTI ID: 7301254
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
EMULSIONS
ENERGY SOURCES
ENHANCED RECOVERY
ESTERS
FLUID INJECTION
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
MICROEMULSION FLOODING
MICROEMULSIONS
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PETROLEUM
PETROLEUM SULFONATES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SULFONATES
SULFONIC ACID ESTERS
WELLS