水驱开发多层油藏井间连通性反演模型  

An interwell connectivity inversion model for waterflooded multilayer reservoirs

作　　者：赵辉[1] 康志江[2] 孙海涛[1] 张贤松[3] 李颖[1] 

机构地区：[1]长江大学石油工程学院 [2]中国石油化工股份有限公司石油勘探开发研究院 [3]海洋石油高效开发国家重点实验室

出　　处：《石油勘探与开发》2016年第1期99-106,共8页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05014);国家自然科学基金资助项目(51344003)

摘　　要：针对当前井间连通性模型只能预测产液动态变化、无法计算油水两相动态且不能分层进行连通性分析等局限性,建立了新的可模拟油水动态的多层油藏井间连通性模型。模型将油藏系统分层离散成一系列由井间传导率和连通体积等参数表征的井间连通单元,并以连通单元为模拟对象进行物质平衡方程计算,通过考虑定液、定压两种生产模式实现压力求解和井间流量计算,结合前缘推进理论建立了井间饱和度追踪计算方法,最终得出井点处各层的油水产出动态;以此为基础利用随机扰动近似法和投影梯度法等通过动态拟合建立了模型参数反演方法。实例应用显示,所建模型取得了较好的动态拟合和预测效果,反演后的连通模型参数与实际油藏地质特征相吻合,验证了方法的正确性;相比当前连通性方法,模型能实时获得分层井间流量分配系数、单井产液和产油劈分系数等信息,可以更准确地反映油藏平面及纵向的油水流动关系和生产措施变化,指导油田实际生产。In view of the limitations that the current connectivity model can only forecast the fluid production dynamic change, can＇t calculate the dynamics of oil and water phases, and can＇t analyze the connectivity between wells layer by layer, this study establishes a new interwell connectivity model for multilayer reservoirs which can simulate dynamics of oil and water between wells. The model hierarchically separates the reservoir system into a series of interwell connecting units characterized by parameters such as conductivity and control volume, and by using the material balance equation, the pressure and interwell flow at constant liquid production and constant pressure is calculated with the connecting unit as simulation object, which are combined with the frontal advance theory to establish interwell saturation tracking calculation method, and finally water production dynamics of every layer at well points can be worked out. On this basis, using simultaneous perturbation stochastic approximation method and gradient projection method, a model parameter inversion method is set up by dynamic fitting. The application cases show that the model has good dynamic fitting and prediction effect, inversed model parameters and the actual geological parameters coincide with well, verifing the validity of the method. Compared with the current connectivity method, it can obtain the real-time model of hierarchical interwell flow rate distribution coefficient, liquid production of single well and oil split coefficient and other information, and reflect the reservoir horizontal and vertical oil-water flow relation more accurately, providing guidance for production measure adjustment in oilfield.

关 键 词：多层油藏 井间连通性 反演模型 井间连通单元 井间流量分配系数 油井产量劈分系数 

分 类 号：TE319[石油与天然气工程—油气田开发工程]