基于精细数值模拟方法的特低渗透储层产量预测模型  

Production Prediction Model of Extra-low Permeability Reservoir based on Fine Numerical Simulation Method

作　　者：王帅 WANG Shuai(CNOOC Research Institute Ltd.,Beijing 100028,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028

出　　处：《数学的实践与认识》2021年第10期144-150,共7页Mathematics in Practice and Theory

摘　　要：传统数值模拟方法未能精细刻画特低渗透油藏非达西渗流规律,导致预测开发指标比实际生产数据偏高.针对上述问题,首次建立五参数法对油藏非均质性进行定量计算,根据不同的储层非均质性和开发程度,提出三种特低渗透油藏数值模拟方法来精细刻画流体渗流规律.并通过特低渗透油藏渗流阻力等效表征及流动单元间双向渗流阻力赋值方法,精准求得了单井及各层的产量.将上述方法应用到渤海X特低渗透油藏产量预测中,方法预测的产量与实际产量相对误差小于0.4%,较传统数模方法预测精度可提高20个百分点以上.该模型不仅为特低渗透油藏产量预测奠定了坚实基础,且可应用于致密油气藏、稠油油藏等数值模拟模型中,具有较强的推广价值.The traditional numerical simulation method fails to describe the non-Darcy seepage law of extra-low permeability reservoir,which leads to the higher predicted development index than the actual production data.For the above problems,this paper establishes five-parameter method for quantitative calculation of reservoir heterogeneity for the first time.According to different reservoir heterogeneity and development stage,three kinds of extra-low permeability reservoir numerical simulation methods are proposed to accurately depict the law of fluid seepage.Through the equivalent characterization of seepage resistance of extra-low permeability reservoir and the evaluation method of two-way seepage resistance between flow units,the output of single well and each layer is accurately obtained.Applying the above method to the production prediction of X extra-low permeability reservoir in Bohai Sea,the relative error between the predicted production and the actual production is less than 0.4%,which can also improve the prediction accuracy by more than 20 percentage points compared with the traditional numerical simulation method.This model not only lays a solid foundation for the production prediction of extra-low permeability reservoir,but also can be applied to the numerical simulation models of tight oil and gas reservoir and heavy oil reservoir,which has a strong promotion value.

关 键 词：特低渗透储层 精细数值模拟 油藏非均质性评价 双向渗流阻力 产量预测模型 

分 类 号：TE328[石油与天然气工程—油气田开发工程]