Process for extracting oil from a subterranean reservoir

Patent · Tue Oct 23 04:00:00 EDT 1984

OSTI ID:6131535

Balzer, D; Kosswig, K

A process for recovering extensively emulsion-free oil from a subterranean deposit of medium or high salinity comprises forcing into an injection well a 1-20% strength solution or dispersion in formation water of a carboxymethylated ethoxylate tenside 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 a mono- or dialkylaromatic residue of 1-14 carbon atoms in the alkyl group, n is 3-30, and M is an alkali or alkaline earth metal ion or ammonium, and wherein the degree of carboxymethylation is incomplete, wherein the tenside is selected so that the phase inversion temperature of the system: crude oil/formation water/tenside/optional additives, lies 0/sup 0/-10/sup 0/ C. above the deposit temperature.

• Assignee: Chemische Werke Huels AG (Germany, Federal Republic Of)
• Patent Number(s): US 4478281
• OSTI ID: 6131535
• Country of Publication: United States
• Language: English

Related Subjects

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