Research on Influence of Surfactant Materials on Oilfield Development
Due to the depletion of resources in most of China's old oil fields,most of them have already developed into tertiary oil recovery during oilfield development.The advantage of tertiary oil recovery is that it can to some extent ensure the oil and gas development capacity of low porosity and permeability reservoirs.However,the efficiency of tertiary oil recovery mostly depends on the performance of chemical oil recovery surfactants.Surfactants in promoting oilfield development mainly depend on the following performance parameters:formation of micro lotion,ultra-low interfacial tension(IFT)and adsorption of surfactants.The first two parameters have a positive relationship with oil and gas development efficiency,and the adsorption of surfactant has a negative relationship with oil and gas development efficiency.The formation of micro lotion is very suitable for the use of surfactant in oil field development because of its low interfacial tension(IFT)value and high viscosity.In this study,particle size analyzer was used to study the size of lotion,the liquid-liquid absorption process and the interception of oil droplets in surfactant droplets.During studying the adsorption mechanism of surfactants on reservoir rocks,Langmuir and Friedrich isotherms were used to study the adsorption process and understand the adsorption phenomenon.The results showed that the adsorption process of surfactants during oil recovery followed the Freundlich isotherm and was a chemical adsorption phenomenon.Because surfactant molecules were adsorbed layer by layer on the surface of rocks,the adsorption rate was high in chemical adsorption phenomena.Because alkali blocked the active sites of clay mineral particles before interacting with surfactants,the combination of the two reduced the adsorption of surfactants.The adsorption isotherm was Langmuir type,indicating physical adsorption.The research result has confirmed that the effectiveness of surfactant flooding can be improved by changing the surfactant material to enhance chemical adsorption efficiency.
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