... Porosity, % 16.8 17.2 16.8 16.4 15.2 16.2 Pore volume, cc 14.4 13.9 14.2 13.9 12.8 13.1 Permeability, md 102 105 104 86 64 87 Table 4 Effect of different alkali-acid concentrations in the inhibitor performance days Alkali concentration @ 90°C 0.2% 0.4% 0.6...

... affects the flooding efficiency. Alkali concentration is intentionally kept low. In fact, high alkali concentration (of about 0.5 molar) is not recommended because the insolubility of in-situ soap (soap produced by the reaction of the alkaline substance with the acid present in the oil phase) causes pore...

.... This proved that there is potential for chemical EOR application in Malaysia. enhanced recovery precipitation chemical flooding methods polymer coreflood reservoir temperature viscosity evaluation surfactant alkali concentration polyacrylamide Upstream Oil & Gas concentration resistance...

... IIIa type atomic force microscope in Digit Instruments Company in America. In order not to affect to "observe" polymer molecule form by microscope, this research did not consider the surfactant. The relationship of the alkali concentration and the polymer's viscoelasticity has been found by using...

... concentrations without alkali additives, while an emulsion phase was always formed with alkali. Measurements of the dynamic IFT revealed that when the alkali concentration is as high as 0.7–1.0 wt%, the IFT rapidly increases after about 100 minutes, which suggests that the system shifts from the middle to upper...