考虑物性时变的裂缝性油藏数值模拟方法  

Numerical Simulation Method of Fractured Oil Reservoir with Time-Varying Physical Properties

作　　者：张福蕾 姜瑞忠[1] 崔永正 邱小龙 张春光 Zhang Fulei;Jiang Ruizhong;Cui Yongzheng;Qiu Xiaolong;Zhang Chunguang(China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学(华东)

出　　处：《特种油气藏》2019年第4期103-108,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“致密储层体积压裂缝网扩展模拟研究”(51574265);国家科技重大专项“厚层非均质气藏产能评价及预测技术”(2016ZX05027-004-004)、“低渗、特低渗油藏水驱扩大波及体积方法与关键技术”(2017ZX05013-002)

摘　　要：长期水驱开发导致储层物性随时间发生变化,为提高物性时变条件下裂缝性油藏数值模拟精度,利用基于面通量的时变表征方法,建立了新的裂缝性油藏数学模型,并自主开发了考虑时变的数值模拟器。将新模拟器与Eclipse软件计算的结果对比,两者计算结果基本一致,其中,日产油量、日产水量、地层压力、井底流压的模拟误差均在0.125%以内。建立概念模型,设计了6种考虑时变的模拟方案研究物性时变对裂缝性油藏开发的影响。结果显示:储层物性的变化程度与水驱时间成正比,不同方案的时变机制对水驱特征和生产的影响不同;渗透率时变条件下采出程度降低,储层边缘剩余油较多,生产井见水后含水率急剧上升;相对渗透率时变条件下主流线水油流度比减小,波及体积扩大,采出程度升高。将考虑时变的数值模拟方法应用于大庆杏树岗油田杏南开发区,模拟数据匹配度明显高于Eclipse软件,新模拟器对于长期水驱开发油田后期的精确历史拟合有良好的效果。该研究对预测裂缝性油藏水驱动态和调整后期开发措施具有重要的理论和应用价值。Long-term waterflooding development results in the changes in reservoir physical properties with time.In order to improve the numerical simulation accuracy of fractured oil reservoir with time-varying properties,a time-varying characterization method based on surface flux was used to establish a mathematical model for fractured oil reservoir,and the corresponding numerical simulator considering time-varying physical properties was also independently developed.A conceptual model was established and simulated by this new developed simulator,which was also compared with the simulation of Eclipse Software.The relative errors for the daily oil production rate,daily water production rate,formation pressure,bottom-hole flowing pressure are all within 0.125%,which shows a high simulation accuracy.Six simulation schemes were designed and simulated by using this time-varying conceptual model to study the effects of time-varying physical properties on the development of fractured oil reservoir.Result shows that the varying level of physical properties is proportional to the waterflooding period.The time-varying mechanism results in various effects on waterflooding and production performances.The time-varying physical properties lead to lower recovery degree,more residual oil at the reservoir edge and sharp water-cut rising after water breakthrough.The time-varying relatively permeability results in a lower water-oil mobility ratio,higher swept volume and higher recovery degree.This new numerical simulation method considering time-varying physical properties was applied to the Xingnan development zone of Xingshugang Oilfield in Daqing.The simulation indicates a higher matching degree than that of Eclipse software.The new simulator is more applicable for the accurate history matching of waterflooding oilfield with long-term production period.This study could provide an effective technical method for predicting the waterflooding performance of fractured oil reservoir and later adjustment.

关 键 词：数值模拟 裂缝性油藏 物性时变 水驱开发 面通量 大庆杏树岗油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]