Micelles composed of mixed surfactants with different structures (mixed micelles) are of great theoretical and industrial interest. This work pertains to maximizing interfacial tension (IFT) reduction via surfactant pairs. In this respect, four types of fatty acid amides based on lauric, myristic, palmitic, and stearic acids were blended with dodecyl benzene sulfonic acid at a molar ratio of 4:1 and designated as A 1 , A 2 , A 3 , and A 4 , respectively. The IFT was measured for each blend at different concentrations using Badri crude oil. The most potent formula (A 4 ) was evaluated for using in enhanced oil recovery (EOR). The IFT was tested in the presence of different electrolyte concentrations with different crude oils at different temperatures. Finally several runs were devoted to study the displacement of Badri crude oil by A 4 surfactant solution using different slug sizes of 10, 20, and 40% of pore volume (PV). The study reveled that Badri crude oil gave ultra-low IFT at lowest surfactant concentration and 0.5% of NaCl. The recovery factor at a slug size of 20% PV was 83% of original oil in place compared with 59% in case of conventional water flood.Paper no. JSD1079 in JSD 2, 201-205 (April 1999). KEY WORDS:Enhanced oil recovery, ethoxylation, interfacial tension, nonionic surfactants, and water solubility. RESULTS AND DISCUSSIONThis work briefly discusses some of the advantages of using blended surfactants, notably enhanced mobility con-FIG. 4. Effect of temperature on IFT between Badri crude oil and A 4 at optimal surfactant concentration and optimal salinity. See Figure 1 for abbreviation. 204 M. EL-BATANONEY ET AL. FIG. 6. Effect of surfactant slug size on oil recovery by surfactant water flood: ■ at 1 pore volume (PV), ▲ at 2 PV, × at 3 PV on Badri crude oil at 1% of blend A 4 and 0.5% of NaCl. FIG. 5. IFT vs. surfactant concentration of A 4 with different types of crude oils: ◆ Badri, ■ Ras Fanar, ▲ ▲ Belayiem crude oil at 30°C and 0% NaCl. See Figure 1 for abbreviation.

No abstract

SYNOPSISN-Alkyl acrylatecl and n-alkyl methacrylates were prepared by esterification of acrylic and methacrylic acids with two long-chain alcohol blends NAFOL 2022 and NAFOL 1822. The prepared monomers were characterized and polymerized individually. In addition, copolymers of n -alkyl acrylate-n-alkyl methacrylate, and n -alkyl methacrylate-vinyl acetate and a terpolymer of n-alkyl acrylate-acrylic acid-vinyl acetate were also synthesid These polymers were also characterized and then evaluated as flow improvers in Khalda mixtureand S a l m Egyptian waxy crudes. The majority of the prepared additives showed good performance in improving the flow properties of the tested crudes. 0 1994

Proper evaluation of physical properties of hydrocarbon mixtures is a prerequisite for the design of various stages of oil field operations.In many cases these properties are required at a time when the only information available consists of oil and gas gravities and reservoir pressure and temperature. The purpose of this study is to utilize a sufficient base of laboratory-measured PVT data to derive specific empirical correlations for the prediction of the saturation pressure Pb, gas in solution Rs and tool in this work is some of regression analyses techniques. The correlations are based on 90 experimentally measured data which represent about 30 independent reservoirs.These data are expressed in terms of the usually measured field parameters-flash separation gas-oil ratio, tank oil gravity, surface gas gravity (at separator conditions) and reservoir temperature.The gases are relatively free from non-hydrocarbons. Statistical accuracy tests show that the application of derived correlations for Egyptian reservoirs gives more accuracy than the known correlations (Standing and Glaso).The use of the derived relationships requires no graphs nor charts, and their applicability is convenient to use with the computer or calculator.