Imparting in situ stability to displacing fluids
In order to better stabilize the displacing fluid used in secondary-type recovery, a liquid preslug containing a water soluble semipolar compound or electrolyte is injected into the formation. Laboratory tests were performed on Berea sandstone cores and the following sequence of injection was derived: (1) an aqueous preslug of water soluble semipolar organic compound and electrolyte; the preslug may consist of a solution of sodium chloride and isopropanol; (2) a micellar solution comprised of hydrocarbon, water, surfactant (e.g. ammonium petroleum sulfonate having an average molecular weight of 450), semipolar compound, and electrolyte; (3) mobility buffer of polysaccharides or polyacrylamides; and (4) drive fluid which can be either hydrocarbon or aqueous. Recoveries from core flooding tests ranged up to 93.6 percent of the crude in the core.
- Assignee:
- Marathon Oil Co.
- Patent Number(s):
- US 3605894
- OSTI ID:
- 7299588
- Country of Publication:
- United States
- Language:
- English
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Imparting in situ stability to displacing fluids
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Related Subjects
020300* -- Petroleum-- Drilling & Production
COLLOIDS
DISPERSIONS
EMULSIONS
ENERGY SOURCES
ENHANCED RECOVERY
ESTERS
FLUID INJECTION
FOSSIL FUELS
FUELS
MICROEMULSION FLOODING
MICROEMULSIONS
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PETROLEUM
PETROLEUM SULFONATES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STABILITY
SULFONATES
SULFONIC ACID ESTERS
WELLS