.... The aqueous stable surfactants were tested for contact angles on the mineral surface. Seven surfactant candidates were selected for spontaneous imbibition experiments, where oil recovery was monitored as a function of time. Wettability-altering surfactants increase the oil recovery by spontaneous imbibition...

... challenge. Our main goal is to improve and validate a physically based model to predict contact angles from zeta-potential measurements. We propose a new mass-action formulation for surface complexation model (SCM) that includes the energy interaction effect between two close surfaces (PS). Currently, most...

... angle measurement thermal method conformance improvement complex reservoir upstream oil & gas urea experiment surfactant ift measurement contact angle formulation wettability alteration oil recovery application oklahoma Introduction The application of horizontal drilling...

... simulations, relative permeability scanning curves show a locus of residual saturation and connectivity which defines an important limit for the physical k r region. The change of this locus is also considered for two contact angles. PNM data further allows for the estimation of the relative permeability...

... number of surfactants (anionic, non-ionic and cationic) and their blends were studied for aqueous stability, contact angle and spontaneous imbibition. Seven single surfactants and nine surfactant blends were found to be stable in both high and low salinity brines at 125 °C. All aqueous stable blends...

.... In addition, the data we generated using various chemical EOR techniques support the interest of using low-IFT inspired chemical EOR methods to improve the ultimate recovery from tight reservoirs. enhanced recovery chemical flooding methods Brine Fluid Dynamics experiment evaluation contact angle...

... Brine permeability contact angle injection wettability alteration Oil Recovery reservoir Introduction Spontaneous Imbibition Spontaneous imbibition experiments were conducted to determine the recovery of oil and the effectiveness of surfactants in imbibing into the cores. Core plugs...

... has not been fully explored. This work was an attempt to conduct a systematic experimental study to improve our understanding of wettability of tight oil reservoirs and the mechanisms of its alteration on oil recovery improvement. Contact angles of individual rock-forming minerals and reservoir rock...

... oil recovery. We measured various interrelated crude-oil( CO )/brine( W )/calcite( R ) interfaces, focusing on their physical and chemical – both static and dynamic – changes, such as contact angles, macro- to nano-scale surface topography ( e.g. , roughening, restructuring), and surface chemical...

... and fluid-rock interactions have been extensively conducted at micro- and macroscopic scale, attempting to reveal the underlying mechanisms responsible for wettability alteration. Indeed, routine methods for assessing macro-wettability of fluids on rock surfaces (contact angle) include the sessile drop...

... The main difficulty in developing this method was to obtain a surface adapted to the selection of additives, that is to say sufficiently hydrophobic so that a drop of aqueous solution does not spread, but not too hydrophobic so that the additives tested can modify the contact angle down...

... advantage of contact angle hysteresis that occurs in porous media. It defines a critical oil ganglia length that depends inversely on capillary number and depends on porosity, permeability, and wettability. We have combined the critical oil ganglia expression and ganglia length distribution in porous media...

... act like capillaries. In the presence of two immiscible fluids in a capillary, a capillary pressure is generated which impacts the process of imbibition. The relationship between capillary pressure, IFT, contact angle, and pore radius is given by the Young-Laplace equation as shown in Eq. 1 . (1...

... on the contact angle in a preferentially oil-wet formation. We assume that interfacial tension (IFT) between oil/water and oil/gas remain unchanged in the presence of surfactants. In order to apply the effect of contact angle on multiphase fluid flow in porous media, existing relative permeability and capillary...

... from Marcellus shale slightly improved when using low or high pH solutions due to wettability alteration that has been supported by the changes in the measured contact angles before and after exposure to such solutions. The rock hardness of Marcellus samples was significantly affected by using both...

... dual-drop-dual-crystal contact angle measurements to characterize wettability changes and coreflood experiments for oil recovery and oil/water relative permeability measurements using a dolomite reservoir rock-fluids system. Additional experiments have been conducted to examine the roles of brine...

... with 0.5 μm filter. A liquid anionic surfactant (ammonium alkyl ether sulfate, A in Figure 2 ) was purchased from Stepan Chemical Company and utilized as received for IFT and contact angle measurements. Sodium dodecane sulphate (SDAS) (99%, Fluka), diethylene glycol monohexyl ether (C 6 E 2 ) and Aerosol...

...) in the oil phase affect the wettability (i.e. contact angle distribution) of oil-water-rock systems. Specifically, we discuss high resolution atomic force microscopy (AFM) experiments demonstrating the preferential adsorption of multivalent cations to mineral surfaces such as mica and gibbsite. Cation...

..." the surface with the tip produces data that can be converted to maps of adhesion and contact angle. Adhesion work is proportional to wettability and is directly correlated with the salinity of the fluid in contact with the tip and the particle surface. From our measurements, the threshold values for the onset...

... flow in porous media alteration upstream oil & gas rock wettability contact angle surfactant solution enhanced recovery concentration relative permeability surfactant aqueous phase saturation surfactant concentration wettability chemical flooding methods fluid dynamics...