聚/表二元复合体系配方优选及其驱油效果评价

Formulation Optimization of SP Binary Complex System and Its Oil Displacement Effect Assessment

王荣健 薛宝庆 卢祥国 张云

WANG Rongjian XUE Baoqing LU Xiangguo ZHANG Yun

以大庆喇嘛甸油藏地质特征和流体为研究对象，开展了聚/表二元复合体系组成对驱油效果的影响研究。结果表明，在等药剂费用且固定聚合物质量浓度（2200 mg/L）的条件下，在适当浓度范围内，随表面活性剂浓度增加和碱浓度降低，驱油剂视黏度增加，界面张力逐渐增加；与碱/表/聚三元复合体系相比，聚/表二元复合体系阻力系数和残余阻力系数较大，液流转向能力较强，但当表面活性剂加量过高（2.0%）时，阻力系数和残余阻力系数降低。表面活性剂质量分数由0.5%增至5.0%时，聚/表二元复合驱采收率增幅先增加后降低，在表面活性剂加量为1.5%时达到最大值22.5%；“产出/投入”比由6.7 降至0.8。当表面活性剂加量在0.5%数1.5%时，二元复合驱技术经济效果较好。碱加量由0.4%增至1.2%时，聚/碱二元复合驱采收率增幅由14.2%降至9.9%。聚/表二元复合体系优选配方为聚合物质量浓度2000 mg/L，表面活性剂质量分数0.5%数1.5%。

According to Daqing Lamadian reservoir geology and fluid properties as the research object, the composition of polymer and surfactant (SP) binary complex system and its effect on oil displacement were studied. The results showed that under the condition of equal reagent cost and fixing polymer concentration (2200 mg/L), the apparent viscosity of oil displacement agent and the interfacial tension increased with increasing surfactant concentration and decreasing alkali concentration in appropriate concentration range. Compared with ASP(alkali/surfactant/polymer) ternary compound system, the resistance coefficient and residual resistance coefficient of SP binary compound system was larger, and the ability of fluid diversion was stronger. But when the surfactant concentration was too high (2.0%), the resistance coefficient and residual resistance coefficient would decrease. When the surfactant mass fraction increased from 0.5% to 5.0%, the enhanced oil recovery rate of SP system increased first and then decreased, and the maximum value 22.5% appeared with 1.5% surfactant dosage, the output/input ratio decreased from 6.7 to 0.8. When the surfactant dosage was 0.5%—1.5%, the economic effect of SP binary flooding technical was better. When the quantity of alkali increased from 0.4% to 1.2%, the enhanced oil recovery rate of poly/alkali binary compound flooding decreased from 14.2% to 9.9%. The optimum formula of SP binary complex system was 2000 mg/L polymer and 0.5%—1.5% surfactant.