Alkaline Surfactant Polymer enhanced oil recovery process

Alkaline Surfactant Polymer Enhanced Oil Recovery Process by Shunhua Liu This thesis improves the understanding of the Alkaline Surfactant Polymer (ASP) enhanced oil recovery process in order to optimize the ASP operational strategy. The conventional oil recovery methods leave large amounts of oil in the reservoir. ASP process is considered as a promising method for enhanced oil recovery. This dissertation reveals the ASP characteristics by using phase behavior, interfacial tension, surfactant consumption and numerical simulation techniques. The flooding experiments that I performed show that my ASP strategies successfully recover the oil trapped after waterflooding. The optimal salinity varies when either synthetic surfactant concentration or Water Oil Ratio (WOR) changes in ASP system. In this thesis, these results could be collapsed to a single curve for each synthetic surfactant/crude oil combination in which the optimal salinity depends only on the molar ratio of natural soap to synthetic surfactant, or soap fraction of total soap plus surfactant. The ASP system studied here has a much wider low IFT region (< 0.01 mN/m) than the system without alkali. In much of the Winsor I region where an oil-in-water microemulsion coexists with excess oil, a second surfactant-containing phase was seen to exist in colloidal form. This colloidal dispersion plays an important role in reaching the ultra-low tension. A new protocol, which significantly reduces the time that is required to

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