Modified Soudium Petroleum Sulfonate Involving Enhanced Oil Recovery And Characteristics

Sodium petroleum sulfonate is a high economic and effective surfactant involving enhanced oil recovery, but with resisting calcium and magnesium ions restrict which limits its wide use in practice. This article takes the furfural extracted oil and vacuum distillate oil of Daqing refining oil company as raw material, with Friedel-Crafts acylation, Knoevenagel and sulfonation reaction, composed the modified petroleum sulfonates PCS with high resisting capacity to calcium and magnesium ions.First in this article we adopt the benzene and toluene as matrix to make 3-phenyl-2-ethyl formate-2-ethyl pentenate and the 3-tolyl-2-ethyl formate-3-ethyl octadecanoate. By MRI and IR experiment we discovered there are ester group in the products, which makes sure the feasibility of the experiment and its conditions and steps. We made MRI and IR experiment to the product petroleum sulfonates PCS made from furfural extracted oil and vacuum distillate oil, and found there are ester group and sulfonic acid group in the product.By Wilhelmy plate method we test the minimum surface tensions and critical micelle concentrations(CMC) of both Sodium petroleum sulfonates, we found the CMC of the modified petroleum sulfonates PCS made from the furfural extracted oil is 1.23×10^-3 g/L, with minimum surface tensions is 39.14mN/m. While the CMC of the modified petroleum sulfonates PCS made from the vacuum distillate oil is 1.09×10^-3g/L, with minimum surface tensions is 43.35mN/m.By spinning drop technique we test the interfacial tensions between daqing stratum water and daqing crude oil. With different matching of range of alkalinity and quality of surfactants, we try to look for the diversification of the interfacial tensions between oil and water. We found there is a best alkalinity for the PCS synthesized from furfural extracted oil, while the PCS synthesized from vacuum distillate oil can have ultra-low interfacial tensions only under high alkalinity. The mixed flooding system made from 0.3 % modified petroleum sulfonates PCS, 1.2% Na₂CO₃ and 1200mg/L polypropylene amide, can make the interfacial tensions between daqing stratum water and daqing crude oil reach 10^-3mN/m.We test the interfacial tensions of both of the modified petroleum sulfonate PCS in the calcium and magnesium ions solution. The mixed flooding system made from 0.3% modified petroleum sulfonates PCS, 1.2% Na₂CO₃ and 1200mg/L polypropylene amide, can make the interfacial tensions between the stratum water and crude oil with 600mg/L calcium and magnesium ions reach the lowest level. We found the resisting capacity to calcium and magnesium ions is obviously higher than the common sodium petroleum sulfonate, and the calcium and magnesium resisting capacity of modified products made out of vacuum distillate oil is higher than the modified products from the furfural extracted oil.