摘要
通过室内岩心试验,对低渗储层岩心,气水交替注入方式和水气交替注入方式对驱油效率和相对流度变化的影响进行了研究。结果表明,注入方式的选择对岩心的最终驱油效率和相对流度有很大影响;水气交替注入方式比气水交替注入方式的驱油效率平均高6.5%;无论哪种方式,水驱过程对最终驱油效率的贡献平均大于68.3%;水气交替或气水交替注入第1周期的驱油效率均占最终驱油效率的90%以上;水气或气水交替注入时相对流度均明显低于纯注水和注气,存在注水转注气困难问题。因此在进行水气交替注入时,应充分考虑注入方式可能带来的影响。
By laboratory rock experiments , the core of low permeability reservoirs , the effects of water alternating gas and water alternating gas injection on oil displacement efficiency and the relative variation of mobility were studied.Laboratory studies showed that the selection of injected way had great influence on ultimate core displacement efficiency and relative mobility , the efficiency of WAG was averagely 6.5% higher than that of water alternating gas , regardless of any type of injection , the contribution of ultimate oil displacement efficiency was more than 68.3%in average in water injection , WAG or gas alternating water injection of the first cycle of displacement efficiency was over 90% of the ultimate efficiency of oil displacement.The relative mobility of WAG or gas alternating water injection was obviously lower than that of pure water and gas injections , but there existed problem of water injection turning to gas injection. So during the WAG injection , possible impact on infection methods should be fully considered.
出处
《石油天然气学报》
CAS
CSCD
2013年第7期114-117,2,共4页
Journal of Oil and Gas Technology
基金
国家科技支撑计划项目(2012BAC26B03)
关键词
水气交替
低渗储层
注入方式
驱油效率
相对流度
WAG
low permeability reservoir
injected way
displacement efficiency
relative mobility
