摘要
在油藏周期注水开发中,毛管的驱替和吸入过程是交替进行的。如果吸入过程的时间很短,吸入过程就无法完全达到平衡,致使流体交换不充分。基于此,引入吸入过程平衡时间的概念,利用一维岩芯数值模拟技术,分析了实际油藏周期注水吸入过程机理,并研究了油水黏度比、毛管力、含水饱和度等参数对吸入过程平衡时间的影响。结果表明:油水黏度比过大、毛管压力差太小及高的含水饱和度都会造成平衡时间增加,使实际周期注水中的吸入过程无法达到平衡,致使周期注水效果变差;特别是在高含水阶段,由于含水饱和度高、毛管力小,吸入过程达到一次平衡所需时间长,致使高含水饱和度情况下停注时间远小于吸入过程平衡时间,从而造成周期注水无法达到预期效果。对周期注水吸入过程机理的研究为油藏周期注水合理工作制度的制定提供了有效的依据。
The process of displacement and imbibition is alternative in the cyclic water injection.If the time of imbibition is short than needed time,the balance of imbibition can not be attained,which makes insufficient exchange of fluid.Based on that,the concept of balance time is introduced,the one dimension core simulation is used,the mechanism of imbibition of practical reservoir is analyzed and the influence of viscosity ratio of oil and water,capillary,water saturation to balance time of imbibition are studied.The results show it will make the balance time increase for the big viscosity ratio of oil and water,small capillary and high water saturation,which will make the balance of imbibition be unable to be attained and the effect of cyclic water injection not good.Especially in the period of high water cut,owing to the high water saturation and low capillary pressure,the process of imbibition needs more time to attain balance.When the time of stopping production is less than the balance time of imbibition,the cyclic water injection would not achieve the expected effect.It offers the effective assist to the establishment of rational work system through the research of mechanism of imbibition in cyclic water injection.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期101-104,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金项目"多孔介质气固渗流实验及渗流机理研究"(10902093)
关键词
周期注水
吸入过程
平衡时间
毛管力
数值模拟
cyclic water injection
imbibition process
balance time
capillary pressure
numerical simulation
