... 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...

... Abstract Fracture treatment performance in Bakken shale reservoirs can be improved by altering rock wettability, as measured with contact angle (CA), from oil-wet to water-wet. The use of chemical additives for altering wettability also results in alteration of the interfacial tension (IFT...

... transition variation stability interface adsorption divalent ion experiment wettability alteration surface charge enhanced recovery concentration Upstream Oil & Gas alteration composition silica interaction mechanism contact angle reservoir Oil Recovery Introduction One...

... for the current work since it allows monitoring the physical and chemical alteration of rock surface after interacting with fluids which contain specific types and amount of ions. In addition, since NMR is non-destructive measurement, the effect of various types of fluids with the identical rock sample before...

... Abstract Wettability modification of solid rocks by using surfactants is an important process that is used in practical applications such as oil recovery from reservoirs. When wettability is altered, both capillary pressure and phase relative permeability change wherever the porous rock...

... Summary Alteration of wettability from liquid wetting to intermediate gas wetting has great potential in improving gas well productivity from water-blocking and condensate blocking in gas reservoir. Presence of some salt ions such as Na + even in small quantities in the initial water...

... have shown that sulphate ions in the seawater may alter the wettability towards increased water-wetness. One-dimensional spontaneous imbibition tests of seawater into preferentially oil-wet chalk cores are performed. To get a better understanding, a numerical model has been developed which includes...

... out in a range of pressures extending up to 150 bar, both with CO 2 and H2S, and with mineral substrates representative of caprock minerals such as quartz and mica, as well as with a substrate sampled from the caprock of a depleted gas reservoir. We observed that the wettability alteration of mica...

... and IFT) and water/calcite interface (potential surface charge), is investigated in this paper. Material and Methods Materials: Abstract Carbonate reservoirs become more water-wet during thermal recovery. The effect of temperature on wettability-altering process is caused by contribution from...

... of the chemical was left on the rock surface; the surface energy decreased and the solid surface was altered to preferential gas-wet as a result of adsorption. The spontaneous water imbibition into the air-saturated rock was conducted before the chemical treatment. The same measurements were repeated after...

... the crude oil is made in contact with CO 2 . They include oil swelling, lightends extraction, initial turbulent mixing, skin layer, oil drop movement, wettability alteration, asphaltene precipitation, and bubbling at the crude oil-CO 2 interface. In particular, the lightends extraction, initial turbulent...

... the cationic surfactant DTAB with a West Texas crude oil. All the carbonate surfaces (Lithographic Limestone, Marble, Dolomite and Calcite) show similar behavior with respect to wettability alteration with an anionic surfactant. Anionic surfactants, which lower the interfacial tension with the crude oil...

... depending on microenvironment conditions at pore space: Fluids Rheology alterations, Interfacial Tension/Wettability alterations and Rock-Biomass interactions. There are controllable factors to modify the original microcosms status like nutrients, biocatalyzers, inhibitors, external-added microbial...

... technologies have not been widely accepted by the oil and gas industry as a means to recover residual oil. The Bio-Competitive Exclusion (BCX) biological process has successfully demonstrated significant oil recovery results in mature waterfloods from the deliberate alteration of indigenous reservoir...

... is different from primary drainage due to a change in wettability of the core from a water-wet state to mixed-wet state. These trends were not observed with decane. Both limestone and sandstone cores become more susceptible to wettability alteration as the salinity is increased. The wettability index(Aw-Ao...

... mechanism was especially important near the production well where the core was taken. Both simulation and field data show that additional miscible gas injection into this area would yield very little incremental EOR. mcguire upstream oil & gas production rate alteration stock tank oil...

... and macroscopic scales. Polar oil components can adsorb onto the pore-bounding mineral surfaces by several different mechanisms. In this study, we explore a transition in the mechanism of wettability alteration that relates to the asphaltene fraction and its stability in the oil phase. Asphaltene stability...

... matter (fines, mud solids, asphaltenes etc.) as well as wettability alteration. While the permeability reduction and its possible remedies have been well-characterized in laboratory core floods, the wettability alterations induced by the interactions between the rock and the various fluids used...

... a reproducible method for altering the wettability of outcrop chalk. A secondary objective was to determine mechanisms involved and the stability of the wettability change. The aging technique was found to be reproducible and could alter wettability in Rordal chalk selectively, from strongly water wet to near...

... to wettability alterations. This is then followed by simulations of spontaneous water imbibition, forced water drive, spontaneous oil imbibition and forced oil drive - i.e. a complete flooding sequence characteristic of wettability experiments is considered. The model takes into account many pore level flow...