特低渗储层驱油效率影响因素分析  

Analysis of Influence Factors of Oil Displacement Efficiency in Ultra-low Permeability Reservoir

作　　者：庞振宇 李艳[2] 王蓓蕾 黄春霞 段伟 姚振杰 Pang Zhenyu Li Yan Wang Beilei Huang Chunxia Duan Wei Yao Zhenjie(Research Institute of Shaanxi Yanchang Petroleum （Group） Co. , Ltd. , Xi＇an, Shaanxi 710075, China Institute of Bureau of Nonferrous Metal Geological Prospecting of J ilin Province, Changchun, Jilin 130012, China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [2]吉林省有色金属地质勘查局研究所,吉林长春130012

出　　处：《非常规油气》2017年第4期76-81,共6页Unconventional Oil & Gas

基　　金：陕西省科技统筹创新工程"陕北致密砂岩油藏CO2驱提高采收率关键技术研究及先导试验"(2014KTZB03-02);国家重点研发计划政府间专项"碳捕集;封存;利用的示范及新一代技术研发"(2016YFE0102500);国家科技支撑计划课题"CO2埋存与提高采收率技术"(2012BAC26B03)联合资助

摘　　要：利用真实砂岩水驱油试验、恒速压汞、铸体薄片、扫描电镜、X衍射等试验手段,研究分析特低渗储层的驱替类型、剩余油赋存状态及影响驱油效率的主控因素。结果表明:研究区驱替类型主要有指状驱替型、网状驱替型和均匀驱替型,残余油类型以油膜残余油、绕流残余油为主,少见孔隙边缘及角隅残余油和卡断残余油。影响驱油效率的因素主要有微观孔隙结构及其非均质性、水驱倍数、驱替压力。孔隙结构特征参数中,孔喉半径比与驱油效率呈负相关关系,喉道半径平均值与驱油效率呈正相关关系,其中孔喉半径比对驱油效率的影响最为显著。在一定注水压力范围内,增大水驱倍数与注水压力,可以改善孔隙连通性,提高驱油效率。The flooding type, residual oil occurrence and main factor of controlling reservoir oil displacement efficien- cy in ultra-low permeability reservoir have been analyzed by using water-flooding experiments with the real sand- stone micro-model, constant-rate mercury injection technology, casting thin-sections, scanning electron micrograph observations, X-ray diffractions and so on. The results showed that flooding types include finger flooding, reticular flooding and homogeneous flooding in study area. Residual oil distribution are mainly residual oil film and residual oil flow around （by-pass oil）, pore edge and corner residual oil and card off residual oil are few. Microscopic pore structure, displacement pressure and multiple of displacement volume are primary factors that affecting the effects of reservoir oil displacement. There is a negative correlation between pore throat radius ratio and oil displacement effi- ciency. There is a positive correlation between the average throat radius and oil displacement efficiency. The pore throat radius ratio is the primary factor that affecting the effects of reservoir oil displacement in pore characteristic parameters. In certain pressure range, oil displacement efficiency can be increased effectively by increasing displace- ment volume and displacement pressure.

关 键 词：特低渗储层 驱油效率 恒速压汞 驱替类型 孔喉半径比 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]