局部网格加密与嵌入式离散裂缝模型耦合预测压裂改造井产能  

Productivity simulation of hydraulically fractured wells based on hybrid local grid refinement and embedded discrete fracture model

作　　者：朱大伟[1] 胡永乐[1] 崔明月[1] 陈彦东 梁冲[1] 蔡文新 何艳辉 王小勇 陈辉 李想[3] ZHU Dawei;HU Yongle;CUI Mingyue;CHEN Yandong;LIANG Chong;CAI Wenxin;HE Yanhui;WANG Xiaoyong;CHEN Hui;LI Xiang(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Halfaya Project,Middle East Company,PetroChina,Beijing 100034,China;Peking University,Beijing 100871,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油中东公司,北京100034 [3]北京大学,北京100871

出　　处：《石油勘探与开发》2020年第2期341-348,共8页Petroleum Exploration and Development

基　　金：“十三五”国家油气重大专项“中亚和中东地区复杂碳酸盐岩油气藏采油采气关键技术研究与应用”(2017ZX05030)。

摘　　要：针对利用现有嵌入式离散裂缝方法(EDFM)预测压裂井产能存在不支持角点网格、近井地带精度低、未考虑铺砂浓度不均匀带来的导流能力非均质性等问题,设计了一种角点网格下的EDFM,可实现嵌入式裂缝与基质网格之间传导率的高效计算,同时利用人工裂缝开度点阵数据计算嵌入式裂缝各裂缝片的渗透率,在此基础上提出一种局部网格加密与嵌入式离散裂缝模型耦合求解预测压裂改造井产能的方法。通过与离散裂缝模型(DFN)方法计算结果对比和对中东伊拉克第一口加砂压裂井实际生产数据的拟合,验证了方法的有效性。采用该方法,结合正交设计完成了同区块首口分段压裂水平井改造参数的优化设计与工艺参数优化。研究表明提出的方法对提高EDFM方法适应性及产能预测精度具有理论意义且实用性强,实现了油藏尺度下的裂缝模拟与产能数值模拟的耦合衔接。Using current Embedded Discrete Fracture Models(EDFM)to predict the productivity of fractured wells has some drawbacks,such as not supporting corner grid,low precision in the near wellbore zone,and disregarding the heterogeneity of conductivity brought by non-uniform sand concentration.An EDFM is developed based on the corner grid,which enables high efficient calculation of the transmissibility between the embedded fractures and matrix grids,and calculation of the permeability of each polygon in the embedded fractures by the lattice data of the artificial fracture aperture.On this basis,a coupling method of local grid refinement(LGR)and embedded discrete fracture model is designed,which is verified by comparing the calculation results with the Discrete Fracture Network(DFN)method and fitting the actual production data of the first hydraulically fractured well in Iraq.By using this method and orthogonal experimental design,the optimization of the parameters of the first multi-stage fractured horizontal well in the same block is completed.The results show the proposed method has theoretical and practical significance for improving the adaptability of EDFM and the accuracy of productivity prediction of fractured wells,and enables the coupling of fracture modeling and numerical productivity simulation at reservoir scale.

关 键 词：压裂改造 网格加密 嵌入式离散裂缝方法 油藏数值模拟 产能预测 参数优化 

分 类 号：TE319[石油与天然气工程—油气田开发工程]