摘要
为了深入了解中性露头砂岩的渗吸规律和渗吸采收率,使用盐水和不同种类的表面活性剂溶液研究了中性砂岩的自发渗吸行为,并对比了不同情况下的渗吸采收率。结果表明,同一类型的非离子表面活性剂只有在特定的结构下渗吸效果才能达到最好;阴离子表面活性剂渗吸效果较好;盐水渗吸后再进行表面活性剂渗吸的总渗吸采收率比直接进行表面活性剂渗吸的采收率低。实验结果表明,盐水和阳离子表面活性剂溶液的渗吸采收率均为5%～6%,非离子表面活性剂溶液渗吸采收率为6%～14%;阴离子表面活性剂溶液渗吸采收率为9%～13%。故中性砂岩油藏采用渗吸技术时应优选表面活性剂,且宜尽早开展表面活性剂渗吸。
In order for the imbibition law and recovery to be known,the imbibition behavior was studied with outcrop sandstones which were neutral-wet with brine,different surfactant solution,and imbibition recovery was compared in brine,surfactant solution,and sequence of brine and surfactant solution.It was shown that the same type of nonionic surfactant with a specific structure can obtain the best imbibition results,and anionic surfactants can improve imbibition recovery furthermore.The total imbibition recovery of cores which were first imbibed in brine and then in surfactant solution was smaller than that of cores which were directly imbibed in surfactant solution.The ultimate imbibition recovery of brine and brine with cationic surfactants was between 5% and 6%,and brine with nonionic surfactants between 6% and 14%,and brine with anionic surfactants between 9% and 13% with cores in these experiments.As a result,it was recommended that neutral-wet sandstone reservoir should be injected suitable surfactant in early stage when imbibition technology was chosen.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第4期48-51,共4页
Petroleum Geology and Recovery Efficiency
基金
国家重点基础研究发展计划973项目"化学驱和微生物驱提高石油采收率基础研究"(2005CB221300)
关键词
表面活性剂
渗吸
露头砂岩
中性
采收率
surfactants
imbibition
outcrop sandstone
neutral-wet
imbibition recovery
