王立军 王立辉



摘 要:通过室内物理模拟实验,研究了注入方式对采收率的影响。研究表明,从注聚开始到调剖剂注入结束,含水率明显下降,在聚驱阶段采收率提高幅度较大,为7.27个百分点;总的提高幅度为16.36%,最终采收率为65.71%,与前置调剖实验相比,两者的水驱采收率分别为49.35%和50.68%两者相差不大,但是总提高幅度比前置调剖要低0.9个百分点,最终采收率相差2.23个百分点。说明前置调剖更有利于提高采收率。从综合成本及经济效益因素来考虑,最佳注入方式选用前置调剖段塞0.05 PV。最佳候凝时间为7~10 d。
关 键 词:铬微凝胶; 交替注入; 参数优化
中图分类号:TE 357 文献标识码: A 文章编号: 1671-0460(2015)06-1206-03
Parameters optimization of Chrome Micro Gel System Alternating Injection
WANG Li-jun,WANG Li-hui
(Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University,
Heilongjiang Daqing, 163318, China)
Abstract: Through indoor physical simulation experiment, the effect of injection ways on recovery rate was studied. The results show that, from the beginning of the polymer injection to the end of profile control agent injection, the water cut decreases significantly; in the stage of polymer flooding, the recovery rate increases significantly, by 7.27%, the final recovery efficiency is 65.71%. Compared with the pre-profile control experiment, their water flooding recoveries are 49.35% and 50.68%, with little difference, but the total increase is lower than the pre-profile control by 0.9%. The pre-profile is more conducive to improve the recovery. Considering the cost and economic benefit, the best slug of profile control is set to 0.05PV, the best WOC time is 7~10 days.
Key words: Chrome micro gel; Alternating injection; Parameters optimization
深度调剖技术近年来在油田一类油层已经取得长足发展,目前较为成熟的调剖技术有复合离子、体膨颗粒、CDG和铬交联调剖体系。岩芯驱油实验结果表明,深度调剖可提高一类油层聚驱采收率近10个百分点,深度调剖技术辅助聚合物驱可增加采收率2%以上,现场也取得了较好的增油降水和吸水剖面改善效果,而且根据室内大量实验结果和现场试验效果,也得出了不同油层条件下不同调剖技术的适应性以及流动状态和微观运移变化等规律,对一类油层提高采收率技术研究提供了有力技术支撑[1-3]。
对于优选的调剖剂开展注入时机及各项参数优化实验,以进一步提高二类油层的采收率,同时对现场二类油层开展调剖剂深度调剖和驱油提供依据[4]。注入參数的优化主要包括注入时机的优化、注入段塞的优化以及侯凝时间的确定。……