摘要
针对河南双河油田Ⅵ油组90℃以上高温油藏条件,提出了由表面活性剂SH7与聚合物1630S组成的适合该油藏条件的SP二元复合驱油体系,研究了该二元驱油体系的界面性能、乳化性能、热稳定性能、抗吸附性能及驱油性能。结果表明,SP二元复合驱油体系(1630S浓度1500 mg/L)在SH7浓度高于500 mg/L时油水界面张力可达10^(-3)mN/m超低数量级,SH7浓度高于1000 mg/L后,界面张力可达10^(-4)mN/m数量级,且在30 min内即达到超低。组成为1500 mg/L 1630S+2000 mg/L SH7的SP二元复合体系的乳化性能良好,油水比为7∶3时乳状液黏度是SP二元复合体系的7倍以上。该SP二元复合体系的抗岩心吸附性能良好,在经历五次吸附后,油水界面张力仍可达8.82×10^(-4)mN/m。当体系中氧含量低于0.8 mg/L时,聚合物及SP二元复合体系的长期热稳定良好,95℃下老化180 d后的体系黏度仍高于初始值,油水界面张力可以保持在10^(-4)mN/m数量级。均质岩心驱油实验结果表明,水驱后注入0.606 PV的SP二元复合体系,在水驱(采收率42.26%)基础上可提高采收率22.16%,较同等条件下的聚合物驱高出6个百分点。三倍渗透率级差层内非均质岩心驱油实验结果表明,SP二元复合体系的最佳段塞尺寸为0.6 PV,在水驱基础上提高采收率16.23%。
Accordance with high temperature reservoir conditions of forth oil series of Shuanghe oilfield, the interfactial properties, emulsification property, thermal stability, resistance to adsorption performance and oil displacement performance of surfactant/ polymer （SP） combinational flooding solution composed of the surfactant SH7 and polymer 1630S was evaluated. Experimental results showed that, when the concentration of SH7 was higher than 500 nag/L, the oil-water interfacial tension between SP combinational flooding solution with the 1630s concentration of 1500 mg/L and the crude oil was up to 10^-3 mN/m, and when the concentration of SH7 surfactant was higher than 1000 mg/L, the interfacial tension could be up to 10^-4 mN/m orders of magnitude and reached to ultra-low interfacial tension within 30 min. The emulsifying performance of the 1500 mg/L1630s＋2000 mg/LSH7 binary system was good, and the viscosity of emulsion system with oil-water ratio of 7 ： 3 was 7 times higher than that of the SP binary complex system. The SP binary complex system was resistant to core adsorption, the interfacial tension between SP system after five times adsorption and the crude oil could be still up to 8.82×10^-4 mN/m. Long-term thermal stability of polymer and the SP binary system was good when the oxygen content in the system was lower than 0.8 mg/L, after aging 180 days at the temperature of 95℃, the viscosity of the system was still higher than the initial value, and the oil-water interfacial tension could keep at 10^-4 mN/m orders of magnitude. The homogeneous cores displacement experiment results showed that when injecting 0.606 PV of SP binary composite flooding after water flooding, the oil recovery could be increased by 22.16% on the basis of water flooding , recovery rate being of 42.26%, and was 6% higher than that of polymer system at the same concentration. Three times differential tgermeabilitv exoeriments showed that the best slug size of the SP system was 0.6 PV, the enhanced oil recovery rate was 16.23%.
出处
《油田化学》
CAS
CSCD
北大核心
2017年第1期149-154,共6页
Oilfield Chemistry
关键词
表面活性剂/聚合物二元复合驱
高温油藏
原油采收率
界面张力
乳化性能
surfactant/polymer binary compound flooding
high temperature reservoir
oil recovery
interfacial tension
emulsifying property
