Process for oil recovery from a subterranean reservoir

Patent · Tue Dec 04 04:00:00 EST 1984

OSTI ID:6250146

Balzer, D; Kosswing, K

A process for the recovery of extensively emulsion-free oil from a subterranean reservoir of medium or high salinity comprises forcing into an injection well a 0.1-20% (e.g., 1-20%) by weight solution or dispersion in formation water of carboxymethylated ethoxylates of the formula R-(OCH/sub 2/CH/sub 2/) /SUB n/ -OCH/sub 2/-COOM, wherein R is a linear or branched aliphatic residue of 4-20 carbon atoms or an alkylaromatic or dialkylaromatic residue of 1-14 carbon atoms in the alkyl group, n is 1-30, e.g., 3-30, and M is an alkali or alkaline earth metal ion or ammonium, and the degree of carboxymethylation is between 10 and 100%, wherein the carboxymethylated oxethylate is selected so that the phase inversion temperature of the system: crude oil/formation water/tenside/optional additives, is 0/sup 0/-10/sup 0/ C. above the reservoir temperature.

• Assignee: Chemische Werke Huels AG (Germany, Federal Republic Of)
• Patent Number(s): US 4485873
• OSTI ID: 6250146
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADDITIVES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
DISPLACEMENT FLUIDS
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
METHYLATION
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OIL WELLS
RECOVERY
WATERFLOODING
WELLS