微凝胶与聚合物组合驱复合效应研究及矿场应用

Investigation and Application of Microgel Flooding and Polymer Flooding in Combination

一维与三维岩心驱油实验结果表明,微凝胶段塞与聚合物段塞交替注入的组合驱技术具有良好的复合效应。微凝胶+聚合物的二段塞组合驱方式,可以封堵高渗透层,分流作用好,扩大波及体积的能力强。聚合物+微凝胶的二段塞组合驱方式,可以防止聚合物驱后续水驱的快速指进,延长聚合物段塞的有效期。聚合物段塞的作用是降低流度比和提高驱替能力。组合驱技术"调""驱"结合,效果优于单一的聚合物驱和微凝胶驱。将0.19 PV微凝胶+0.32 PV聚合物组合驱应用于双河油田437Ⅱ1-2油组,到2007年底,组合驱吨聚合物增油105t/t,提高采收率7.44%,采收率增幅比聚合物驱高3.14个百分点时,费用比聚合物驱低11.4%。

The core experiment results of 1-D physical modeling and 3-D physical modeling showed that the combined flooding of microgel slug with polymer slug had a good positive composite effect, The function of microgel slug and polymer slug was to plug the high permeable channel and increase the sweep efficiency. The function of polymer slug and microgel slug was to prevent the breakthrough of post-water flooding and increase the effective time of polymer slug. The function of polymer slug was to reduce water-oil mobility ratio and increase the displacement ability. So the recovery of combined flooding was higher than the microgel flooding and polymer flooding. The combined flooding （0. 19 PV microgel slug ＋ 0. 32 PV polymer slug） was applied in zone 437 H la of Henan oilfield. By the end of 2007, the incremental oil amount of one ton polymer was of 105 t and the oil recovery was enhanced by 7.44%, higher 3.14 percent than the polymer flooding. Furthermore, the chemical cost of combined flooding was decreased by 11.4% compared with polymer flooding.