砾岩油藏弱凝胶调驱的注入参数优选

Optimization study of injection parameters for weak gel displacement control in conglomerate oil reservoir

克拉玛依油田砾岩油藏众多,该类油藏具有特殊的孔隙结构,对弱凝胶调驱技术提出了新的要求,尤其对注入参数优选方面的研究很少。针对七中区克上组砾岩油藏条件,通过物理模拟实验和数值模拟技术相结合,研究了弱凝胶的主剂浓度、段塞尺寸、注入量、段塞组合方式等对采收率的影响规律,并优选出实现较高采收率时的最佳参数,即主剂浓度为1100mg/L,段塞尺寸为0.30倍孔隙体积,注入量为400mg/L·PV,段塞组合方式应采用高浓度前置段塞、高浓度主体段塞和低浓度后续段塞。

For the special pore structure of various conglomerate reservoirs in Kelamayi Oilfield, we should do more study about injection parameters in weak gel profile control and flooding technology. The influencing rule of main agent concentration,slug size,injection rate and slug combination way on recovery efficiency were studied by physical simulation experiments and numerical simulation technology aiming at the condition of the conglomerate oil reservoir in Keshang formation of Qizhong area. The optimum injection parameters were chosen when the recovery efficiency was the highest,that is,the main agent concentration was 110mg/L, slug size was 0. 30PV, injection rate was 400mg/L ?PV, slug assemblage way was high concentration ahead slug and main slug and low concentration slug.