OIL RECOVERY USING POLYMER PRESLUG

Oil recovery from reservoirs having connate water containing at least 500 ppm of divalent cation is improved by first injecting an aqueous preslug containing 50 - 2,000 ppm of a biopolymer and thereafter injecting a displacement slug, preferably a micellar dispersion, followed by a mobility buffer f...

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Bibliographische Detailangaben
Hauptverfasser:	RHUDY J,US, KNIGHT B,US
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MINING MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PAINTS POLISHES
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Beschreibung
Zusammenfassung:	Oil recovery from reservoirs having connate water containing at least 500 ppm of divalent cation is improved by first injecting an aqueous preslug containing 50 - 2,000 ppm of a biopolymer and thereafter injecting a displacement slug, preferably a micellar dispersion, followed by a mobility buffer fluid and this, in turn, followed by a water drive. The preslug containing the biopolymer "insulates" the micellar dispersion from the connate water, the divalent cation tends to degrade the micellar dispersion.