【作者】 刁长军；

【导师】 吴文祥；

【作者基本信息】 大庆石油学院 ， 油气田开发工程， 2009， 硕士

【摘要】 论文以牛心坨油田的地质特征为基础,针对牛心坨油田水驱开发中面临的问题,通过室内物理模拟实验,进行不同驱油体系对牛心坨油田的改善开发效果研究,进而简单结合调剖,研究不同驱油体系对牛心坨油田的驱油效果。本文通过室内实验,筛选出了适合牛心坨油田的聚合物分子量及其浓度,实验结果表明:聚合物浓度在500—1500mg/L,970×10⁴分子量的聚合物与渗透率为100md的岩心具有良好的匹配性,500×10⁴分子量的聚合物与渗透率为50md的岩心具有良好的匹配性。筛选出了具有超低界面张力的表面活性剂,得出:在表面活性剂浓度在0.2%-0.4%范围内,HLX型表面活性剂不论是单独体系还是与聚合物进行复配都无法使油水界面张力达到10^-3mN/m,而单独B型表面活性剂和B型表面活性剂与所选聚合物复配在55℃—70℃,油水间界面张力均在10^-3mN/m数量级以内。本文着重研究不同裂缝长度、不同变异系数对聚合物驱和聚合物/表面活性剂二元复合驱驱油效果的影响,并在此基础上评价调剖剂对驱油效果的影响。研究结果表明:两种驱油体系的化学驱和总采收率均随裂缝长度的增加而增加;当变异系数从0.6升高到0.85时,化学驱采收率升高,但是总采收率随着变异系数的增大而减小;在其它条件不变的情况下,注入调剖剂的驱油体系化学驱和总采收率较未注入调剖剂的驱油体系均有所提高,且结合调剖的聚/表二元复合体系驱油效果最好,结合调剖的聚合物驱次之。更多还原

【Abstract】 Based on the geologic feature and the problems faced in water flooding in Niuxintuo Oilfield, we had done the research on displacement efficiency of different flooding systems through indoor physical modeling experiments.We had selected the proper molecular weight and concentration of polymer through experiments, and the results showed that 970×10~4 of molecular weight and the concentration between 500-1500mg/L was matched well with the cores of 100mD, while 500×10~4 of molecular weight was matched well with the cores of 50mD. Selected surfactants formed ultra-low interfacial tension, the range from 0.2% to 0.4%, the compound systems with HLX surfactant and polymer could not form the ultra-low interfacial tension with oil, even without surfactant. While B kind surfactant system and it with polymer compound system could form the ultra-low interfacial tension between 55℃and 70℃.In the paper, we had particularly done the research on influences of polymer flooding and binary compound flooding on the displacement efficiency in artificial cores with various fracture length and coefficient of variation and based on which evaluated the influence of profile control agent on the displacement efficiency.The results showed that the chemical recovery and total recovery of two flooding systems increased as the fracture length increased. The chemical recovery increased as coefficient of variation ranged from 0.6 to 0.85, while total recovery discreased. Adding the profile control agent systems can enhance more recovery than that without it under the same condition. In total, the experiments carried on the heterogeneous cores showed that polymer-surfactant system had better displacement efficiency than polymer did, while the surfactant is the worst.更多还原