... as a mechanism behind the wettability alteration by LSF in carbonates. Moreover, the interaction between rock and injected brine can lead to change in the injected brine composition and pH. Therefore, it is important to better understand the interaction between injected brine and carbonate rock to de-risk...

... In the reservoir, this surfactant slug will displace the brine in place with an average equal or higher salinity (as a result of mixing of injection brine with formation brine), depending on injection history. This will promote ultra-low IFT between the microemulsion phase and the oil...

... optimized surfactant systems. enhanced recovery chemical flooding methods concentration salinity surfactant retention Brine experiment surfactant Upstream Oil & Gas viscosity optimum condition polymer Chemical Injection crude oil optimal salinity NaCl chemical breakthrough Oil...

..., reservoir temperature of 70°C and in-situ oil viscosity of 0.6 cp. Our laboratory evaluation included zeta potential tests for interface of oil/brine and brine/rock, thermodynamic analysis through disjoining pressure calculation, corefloods using representative core samples. Thermodynamic analysis showed...

... Abstract Increasing flooding solution viscosity with polymers provides a favourable mobility ratio, compared to brine flooding, and hence improved volumetric sweep efficiency. Flooding with a polymer solution exhibiting elastic properties has been reported to increase displacement efficiency...

... results showed that decreasing divalent cations and salinity makes the electrical charges at both oil/brine and brine/rock interfaces become strongly negative, which results in elevation of the repulsive forces between oil and rock, and as a result the rock turns more water-wet, which was confirmed...

... and polyelectrolyte-surfactant systems. This paper also reviews the extent of damage if any, that could be caused due to the injection of nanoparticles. Brine co 2 view cell surfactant enhanced recovery viscosity PEI crude oil chemical flooding methods polyelectrolyte polyelectrolyte complex...

... the possibility of chemical EOR for challenging reservoirs. Upstream Oil & Gas carboxylate surfactant stability formulation chemical flooding methods Brine Chemical Stability alkyl ether carboxylate surfactant concentration enhanced recovery concentration solubility crude oil Reservoir...

... that lead to find an innovative solution founded on the synergy between the formation water properties (low salinity) and high temperature environment in the Caracara Sur Field. The study focused on the polymer screening process, rheological properties of HPAM with the low salinity brine of Caracara Sur...

... oil recovery methods. Several options do exist to tackle these challenges. Developing more costeffective polymers is one of these. Traditional partially hydrolyzed polyacrylamides (HPAM) are sensitive to brine hardness and temperature; increasing both lead to a drop in viscosity which could...

... Polyacrilamide) and Xanthan solutions were extensively characterized using complementary rheological measurement techniques. Effects of concentration, temperature and hardness of reservoir brines were considered. Techniques applied included: rotational rheometry, DLS (Dynamic light scattering) microrheology...

... laboratory evaluation of different THRs, including rheological properties, gel kinetics, gel strength, long-term stability and coreflood experiments. Main results are as follows: i ) gel temperature can be optimized by varying brine salinity and THR type and/or concentration; ii ) gel kinetics is very...

.... displacement process Upstream Oil & Gas enhanced recovery Brine scco 2 ct number profile sample 9 variation breakthrough heterogeneity NaI brine cross section experiment injection permeability sample 10 CT number subsurface storage supercritical co 2 differential ct number...

... Abstract Factors confronting the application of surfactant flood in high temperature, high salinity carbonate reservoirs include: high concentration of divalent ions in the formation brine, the stability of the surfactant in high thermal environment, surfactant adsorption on carbonate rock...

... Abstract Although more emphasis is placed on the interaction between CO 2 and oil during a CO 2 injection process, the interaction of CO 2 with the reservoir brine, too, could be significant in terms of its impact. This study presents a modeling approach to evaluate the possible effects...

... in the brine can be a challenging issue. Different surfactant formulations are evaluated and incorporate cosurfactants and co-solvents which minimize viscous macroemulsions, promote rapid coalescence under Winsor Type III conditions, and stabilize the chemical solution by reducing precipitation and phase...

... IOS Internal olefin sulfonate LCMS Liquid chromotography mass spectroscopy Symbols Symbols Abbreviation Expansion C s Surfactant concentration d Core diameter d 0 Initial core diameter k Brine permeability l Core length l 0 Initial...

... Abstract Surfactant flooding is an enhanced oil recovery process used to mobilize the residual oil by lowering the interfacial tension (IFT) between oil and water. When surfactants are mixed with brine and oil, oil in water, water in oil microemulsions could be formed with region of ultra low...

... In order to change the wettability brine salinity needs to be reduced below a threshold level, believed to be around 5,000 mg/L. If the salinity is further reduced to very low values (well below 1,000 mg/L) this may lead to clay swelling and/or deflocculation, which in turn may plug the rock...

... for sandstone which consists of clay minerals deposited on a glass substrate and covered with crude oil droplets in order to study the kinetics of oil detachment when exposed to low salinity brine. The system is equilibrated first under high saline brine and then exposed to brines of varying (lower) salinity...