倾斜层状油藏水驱效率预测模型  

A Prediction Model of Waterflooding Efficiency for Inclined Stratified Reservoir

作　　者：张瑾琳[1] 吴向红[1] 晋剑利[1] 何聪鸽 李香玲[1] Zhang Jinlin Wu Xianghong Jin Jianli He Congge Li Xiangling(Research Institute of Petroleum Exploration ＆ Development, PetroChina, Beijing 100083, China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《地质科技情报》2017年第4期198-202,共5页Geological Science and Technology Information

基　　金：中国石油天然气集团公司海外油气田开发关键技术研究课题"乍得厚油层岩性砂岩油藏注水开发技术"(2016D-4402)

摘　　要：倾斜层状砂岩油藏具有倾角大、纵向非均质性强、厚度大等特点,而准确预测层状油藏的水驱效率可以为合理开发油田提供重要的依据。目前所研究的层状模型忽略了油藏倾角和重力的影响,为此针对层状油藏倾角大、受重力因素影响等情况,同时考虑油藏倾角、层内窜流及重力分异驱替条件,引入拟相对渗透率曲线,将物性按厚度进行加权平均,结合水驱油理论,建立了倾斜层状砂岩油藏水驱效率模型。计算结果表明,新模型计算结果与生产实际数据基本吻合,从而证明了新模型的可靠性和适用性。敏感性分析表明,当油藏倾角增大时,重力作用使得水沿油藏下部渗透率较小的油层流动,延缓了上部渗透率较大油层的见水时间,从而增大了驱替效率;流度比和渗透率变异系数越小,驱替效率越大。The inclined stratified sandstone reservoir usually has several characteristics of high dip angle,strong heterogeneity and large thickness.Accurate prediction of waterflooding efficiency can provide theoretical basis for efficient development of the reservoir.At present,the prediction methods ignore the influence of dip angle and gravity segregation.Aiming at the actual situation and considering dip angle,cross flow and gravity segregation at the same time,this study has established a model for waterflooding efficiency in the inclined stratified reservoir by introducing pseudo-relative permeability functions,average thickness-weighted in the physical properties and Buckley-Leverett theory.The results show that the calculation of the new model is in good agreement with real field data,which verifies the applicability of the new model.Sensitivity analysis indicates that when dip angle increases,the gravity leads the water to flow along the lower reservoir of low permeability,and causes the delay of the water breakthrough into the upper reservoir,thus increasing the displacement efficiency.and that the lower the mobility ratio and permeability variation coefficient,the greater the waterflooding efficiency.

关 键 词：倾斜层状油藏 重力分异 层内窜流 纵向非均质性 水驱效率 

分 类 号：TE122.1[石油与天然气工程—油气勘探]