石油羧酸盐与烷基苯磺酸盐复配体系在弱碱、无碱条件下的界面活性

Interfacial Activities of Petroleum Carboxylate and Alkyl Benzene Sulfonate Combined System with and without Weak Alkaline

系统地考察了质量比4:1的石油羧酸盐工业产品IC0439与烷基苯磺酸盐近期产品复配物的界面活性。所有实验表面活性剂体系均用大庆采油四厂污水配制,含有1500mg/L的HPAM和Na2CO3(弱碱体系)或NaCl(无碱体系)。当复配表面活性剂浓度(以活性物计)为62.5～2000mg/L、Na2CO3浓度为6000～12000mg/L或NaCl浓度为2000～12000mg/L时,实验体系与大庆采油四厂原油间出现超低界面张力(45℃,稳定值),复配体系的界面活性比单一烷基苯磺酸盐体系明显改善,在无碱条件下改善幅度更大。认为该复配体系对加碱生成的天然表面活性物质的依赖性小,NaCl对表面活性剂在油水两相的分布影响更为有效。为达到相同岩心驱油水平所需的表面活性剂浓度,该复配驱油体系为1500～2000mg/L,大大低于烷基苯磺酸盐驱油体系(3000mg/L),表面活性剂费用可减少20%～40%。

The interfacial activity of a combination of a commercial petroleum carboxylate, IC0439, and a newly manufactured commercial alkyl benzene sulfonate in mass ratio 4：1 was investigated experimentally. All the experimental surfactant systems（ESSs） were prepared in recycled produced water from the 4th Daqing oil production factory（DOPF） and contained 1500 mg HPAM per liter and Na2CO3 （in weak alkaline systems） or NaCI（ in alkaline free systems）. Ultra-low interfacial tensions（ stabilized values at 45℃ ） were created between the crude oil of the 4th DOPF and the ESSs of concentration of surfactants （as active substances）62. 5--2000 mg/ L and Na2CO3 concentration 6000--12000 mg/L or NaCl concentration 2000--12000 mg/L. The interfacial activity of the combinational surfactant systems was improved notably as compared to the single alkyl benzene sulfonate systems and much more significantly in alkaline free cases. It was considered that the combinational surfactant systems were less dependent upon the natural surface active substances formed with the alkaline added and NaCl was more effective in controlling the distribution of surfactant （s） between oil and aqueous phases. The surfactant concentration needed for a flooding system to enhance oil recovery from a core to the same satisfactory extent was lower in the combinational surfactants systems,in range 1500--2000 mg/L,than that in the single alkyl benzene sulfonate systems,3000 mg/L,and thus a reduction in cost of 20--40% might be reached.