... by the larger particle size distribution within the fluid. When exposed to reservoir conditions (elevated temperature, high formation brine salinity, high divalent ion concentration), frac fluids can destabilize due to the presence of polyacrylamide acting as a flocculant. Such behavior causes phase-separation...

... (ANN) model to generate contours of relative permeability in saturation-connectivity space and predict relative permeability for both CO 2 and brine phases as paths are traversed in that space. Experimental data (only one drainage and imbibition curve) is used to tune the ANN model and determine...

... limestone cores (permeability <100 mD) with PEO and HPAM of similar molecular weights (4 MM Dalton) and viscosity; they were designed to measure incremental oil recovery for both polymers. Tracer tests were completed to determine heterogeneity. Brine was displaced by a 50-cP oil, and initial oil...

... the polymer propagation in lower permeability carbonate rocks. To reduce inaccessible pore volume effects, lower molecular weight polymers were selected for screening and yard tests. Synthetic brine was prepared using de-ionized water to maintain optimal water quality at the yard scale. The wetting of powder...

... geology surfactant flow in porous media rock type sedimentary rock carbonate rock mineral chemical flooding methods core analysis formulation salinity concentration wettability alteration enhanced recovery brine permeability spontaneous imbibition pw 40 cationic surfactant experiment...

... Abstract This paper presents an experimental study of aqueous nanobubble dispersion of carbon dioxide (CO 2 -NB) for enhanced oil recovery. CO 2 -NB was compared with brine and slightly supersaturated carbonated water (eCW) in corefloods with Berea sandstone cores and dead oil at room...

... Abstract This paper provides an improved understanding of the impact of initial oil composition and residual oil saturation on brine composition and calcite scaling during CO 2 Water-Alternating-Gas (WAG) Enhanced Oil Recovery (EOR) in carbonate reservoirs. It assesses the impact of different...

... injection reduction geology concentration system 3 permeability reduction gelation an125vhm enhanced recovery brine system 2 crosslinker concentration gel consistency gel consistency adsorption crosslinker proportion ssw brine Introduction Improving water-flood efficiency...

... a compositional reservoir model built in SLB's Petrel software to perform numerical simulations of CO 2 injection incorporating pre-established permeability variations that honor our laboratory-obtained results. Correlations between differential-pressure variations observed during carbonated-brine (CO 2 /brine...

... coreflood two-phase coreflood fluid dynamics polymer associative polymer intermolecular attraction effluent fraction mechanism brine propagation Introduction Hydrophobically modified polyacrylamides are water soluble copolymers containing additional hydrophobic groups incorporated along...

... imbibition Amott cell tests, we conclude the following key findings: The zeta-potential of the calcite-brine surface is strongly dependent on brine composition and temperature. Furthermore, the mineral surface exhibits various complexation reactions that must be further investigated by modeling...

... concentration monitoring methods in EOR projects. mineral polymer concentration doi copolymer 73 geology concentration brine accurate back produced polymer quantification synthetic brine chromatography enhanced recovery polymer bleach information linearity geologist chemical flooding...

... Abstract Enhanced oil recovery (EOR) has been studied for high-salinity high-temperature (HSHT) carbonate reservoirs, but their thermodynamic conditions, brine chemistry, and petrophysical properties tend to pose various technical challenges for both gas- and chemical-based EOR. This paper...

... Abstract High molecular weight Polyacrylamide polymer brine viscosities were measured and modeled in a wide range of conditions to improve fundamental understanding and field application of chemical enhanced oil recovery (EOR) processes. More than 300 steady shear rate sweep viscosity curves...

.... enhanced recovery viscosity implementation geology polymer degradation brine spe journal geologist chemical flooding methods injector kazakhstan oilfield oxygen retention polymer flooding injection seright full-field polymer flooding project concentration Introduction The Kalamkas...

... oils from different parts of the world show that there is a strong correlation between the elasticity of the oil-brine interface and oil recovery. The elasticity of the crude oil – water interface may be tuned by a very small amount of a polymeric surfactant. In this work, we present a systematic...

... Abstract Smart Water (SW) can be defined as brine that has been chemically adjusted/optimized in terms of salinity and ionic composition or carbonation (CO 2 enrichment). The aim is to create a brine with an optimum chemical & ionic composition such that it changes the equilibrium...

... ), we presented experimental results pertaining to the efficacy of using a 1% solution of 3-pentanone (a mutual solvent) and separately a 1% non-ionic surfactant solution injected in four unfractured Permian Basin carbonate cores saturated with a low-salinity brine. The experiments indicated that we...

... and 85 mD. For the two-phase studies, the cores were aged at irreducible water saturation and 120 °C for 14 days, then flooded with glycerol followed by brine to achieve a representative immobile S or . The corefloods were conducted at 50°C in high salinity water of 243,000 ppm. Bulk rheological studies...

... Abstract Controlled-ionic-composition waterflooding improves oil displacement efficiency in heterogeneous carbonate rocks. Recent microscale experimental studies confirm that the injection of brines containing high sulfate ion concentrations alters the wettability of the pore surfaces...