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Carboxymethylated ethoxylated surfactants: Annual report

Technical Report ·
OSTI ID:6253327
;
A method of selecting surfactants for chemical enhanced oil recovery using carboxmethylated ethoxylated surfactants (CES) is described. Structure/performance correlations for hydrophobe, ethylene oxide content, and nonionic-anionic ratio have been developed for a series of CES with alkane carbon number, pH, salinity, phase inversion temperature, and solubilization parameter to provide a guide in selecting candidate surfactants for enhanced oil recovery. Carboxymethylated ethoxylated surfactants are a class of surfactants that generate low interfacial tension against crude oils at high temperatures, high salinities and high divalent ion concentrations. Selection of the surfactant for a specific reservoir can be made based upon determination of the phase inversion temperature (PIT) of the surfactant at reservoir salinity with live crude. An additional scan for phase behavior (salinity scan) can then establish salinity tolerance and solubilization parameters for the selected surfactant system. Correlations of PIT with surfactant structure, salinity, and hydrocarbon have been determined for a number of US reservoirs using CES as the only surfactant. 67 refs., 20 figs., 3 tabs.
Research Organization:
National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
DOE Contract Number:
FC22-83FE60149
OSTI ID:
6253327
Report Number(s):
NIPER-228; ON: DE87001258
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADDITIVES
BENCH-SCALE EXPERIMENTS
CHEMICAL COMPOSITION
CORRELATIONS
DRILL CORES
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
INTERFACES
OIL WELLS
PERFORMANCE
PETROLEUM
PH VALUE
PHASE STUDIES
REAGENTS
RECOVERY
ROCKS
SALINITY
SANDSTONES
SEDIMENTARY ROCKS
SURFACE PROPERTIES
SURFACE TENSION
SURFACTANTS
WATERFLOODING
WELLS