CO_2混相驱驱油方式对榆树林油田采收率影响研究  

Study of the influence of CO_2 miscible displacement on enhanced oil recovery in Yushulin oilfield

作　　者：李孟涛[1] 杨广清[2] 李洪涛 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油吉林油田测井公司 [3]中国石油华北石油管理局第三钻井工程公司

出　　处：《石油地质与工程》2007年第4期52-54,共3页Petroleum Geology and Engineering

摘　　要：CO_2混相驱中为减少气体发生指进,现场常用水气交替注入方式。为了研究CO_2混相驱不同水气驱方式对大庆榆树林油田提高采收率效果的影响,在长岩心上进行了采油工艺实验,研究了气体段塞总量和交替注入气体小段塞大小、含油饱和度大小和水气比对采收率的影响,结果证明了同条件下这些都是CO_2混相驱很重要的因素,注入气体0.3到0.4PV最佳,混相条件下最佳的水气交替驱工艺是至少要有先注入或者间断注入至少一个CO_2的0.1 PV以上的段塞,同条件下提高采收率最大。Water-gas alternate injection way is often adopted on well site to decrease gas fingering during CO_2 miscible displacement.In order to make a study on the influence of CO_2 miscible displacement on enhanced oil recovery in Yushulin oilfield,the long core test is carried out and the influence of total gas slug,gas slug size by water-gas in- jection way,oil saturation and water-gas ratio on en- hanced oil recovery are all studied.The results prove that all these factors are of great importance for CO_2 miscible displacement under the same condition and the optimum injected gas is 0. 3-0. 4PV.Under the condition of misci- ble phases,at least one≤0. 1PV CO_2 slug should be pre -injected or discontinuously injected in order to achieve the greatest water-gas injection effect.

关 键 词：二氧化碳混相驱 采油工艺 采收率 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]