为研究非均质性油藏条件下堵剂的成胶性能,室内使用自主研制的纵向非均质二维长岩心模型和常规的单管与并联填砂管对改性淀粉接枝共聚堵剂进行了研究。结果表明:堵剂配方为5%改性淀粉+5%丙烯酰胺+0.05%交联剂+0.1%引发剂时的注入性良好,对高渗、中渗和低渗填砂管的封堵能力良好,封堵率分别为99.2%、97.1%和91.0%;选择性较好,优先进入高渗透层进行封堵,并随着渗透率级差的增加,注入选择性增强;对长岩心模型水驱形成的大孔道进行了有效的封堵,使得中低渗潜力储层得到充分的动用,高渗、中渗和低渗储层的水驱采收率分别增加2.2%、3.3%和5.6%,最终采收率提高11.1%;耐冲刷能力强。该堵剂成胶性能良好,适用于非均质性稠油油藏。 In order to study the gelation performance of plugging agent under heterogeneous reservoir conditions, a longitudinal heterogeneous two-dimensional long core model developed by ourselves and a conventional single-tube and parallel sand filling tube were used to modify modified starch graft copolymerization blocking agent Were studied. The results showed that the plugging ability of 5% modified starch + 5% acrylamide + 0.05% cross-linking agent + 0.1% initiator was good, and the plugging capacity of high permeability, medium permeability and low permeability sand filling tube Good plugging rates were 99.2%, 97.1% and 91.0%, respectively. The selectivity was better and the plugged into the high permeability layer preferentially. With the increase of permeability, the injection selectivity was enhanced. The large pores formed effectively blocked the reservoirs, making the middle and low permeability reservoirs fully utilized. The waterflood recovery of the high permeability, medium permeability and low permeability reservoirs increased by 2.2%, 3.3% and 5.6% respectively, The ultimate recovery rate increased 11.1%; resistant to erosion ability. The plugging agent has good gelling properties and is suitable for heterogeneous heavy oil reservoirs.