基于改进DFM-NM的页岩油多井干扰三维数值模型及应用  

A three-dimensional numerical model and application of shale oil multiwell interference based on improved DFM-NM

作　　者：周彪 陈志明[1] 赵辉[2] 韩佳鹏 赵续荣 YU Wei ZHOU Biao;CHEN Zhiming;ZHAO Hui;HAN Jiapeng;ZHAO Xurong;YU Wei(College of Petroleum Engineering,China University of Petroleum-Beijing,Beijing 102249,China;College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Hildebrand Department of Petroleum and Geosystems Engineering,The University of Texas at Austin,Austin TX78712,USA)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]长江大学石油工程学院,武汉430100 [3]美国得州大学奥斯汀分校石油与地质系统工程系,得州奥斯汀TX78712

出　　处：《石油科学通报》2024年第6期1005-1022,共18页Petroleum Science Bulletin

基　　金：国家自然科学基金面上项目(52274046、52074322);北京市科技新星计划(20230484249)联合资助。

摘　　要：矿场实践表明,立体井网开发技术可有效挖掘页岩油气资源未动用储量。然而,随着立体井网的加密部署,导致平面及纵向井间干扰现象愈发严重,限制了页岩油气资源的高效开发,准确评价井间干扰程度及其影响因素是目前亟需解决的关键问题。为此,基于改进的离散裂缝数值试井模型,采用非结构四面体网格建立考虑纵向干扰的立体开发页岩油多井干扰三维数值模型,采用Newton-Raphson迭代对模型进行了求解。验证了数值模型的准确性,并定义井间干扰程度系数,分析不同井距与裂缝参数下的井间干扰程度。结果表明随着水平井距的增大,井间干扰程度迅速减小;随着纵向井距的增大,井间干扰程度先增大后减小;与纵向井距的影响相比,水平井距对井间干扰程度的影响更显著;干扰程度随着邻井开采强度、压裂裂缝数目、压裂裂缝长度和压裂裂缝导流能力的增大而增大;天然裂缝会加剧井间干扰程度。对鄂尔多斯盆地两口压裂水平井进行实例应用,结合灰色关联度分析方法,计算了井间干扰程度与各参数间的关联度,确定了影响其井间干扰程度的主控因素为沿裂缝方向水平井距、压裂裂缝长度和压裂裂缝数目。同时发现,纵向井距对井间干扰程度有显著影响,立体开发下的纵向干扰不容忽视,合理的纵向井距能够有效降低井间干扰程度。研究结果可为立体井间干扰评价及页岩油开发参数优化提供理论依据。Field practices have demonstrated that three-dimensional well-pad development technology can effectively exploit untapped reserves of shale oil/gas resources.However,the applications of the three-dimensional well-pad development has led to increased horizontal/vertical multi-well interferences.This phenomenon has become increasingly severe,which restricts the efficient development of shale oil and gas resources.Thus,accurately assessing the degree of well interference and its influencing factors is a critical issue that urgently needs to be addressed.To tackle this,we proposed a three-dimensional numerical model of multi-well interference.The proposed model is based on the numerical well-testing model for fractured reservoirs based on unstructured tetrahedral mesh.In addition,the discrete fracture model(DFM)is used to account for non-penetrating geological fracture features.The numerical model is solved using Newton-Raphson iteration.Its accuracy is verified by comparing it with a commercial well testing software.After verification,a coefficient for the degree of well interference is defined,and the analyses of well interference under different well spacings and fracture parameters are conducted.The results indicate that increasing the horizontal spacing leads to a rapid decrease in the degree of well interference.As the vertical spacing increases,the degree of well interference initially increases and then decreases.The influence of horizontal spacing on the degree of well interference is more significant compared to the impact of vertical spacing.The degree of interference increases with the greater production intensity,hydraulic fracture number,hydraulic fracture length,and hydraulic fracture conductivity of adjacent well.The existences of natural fractures can strengthen the degree of well interference.Applying grey relational analysis method,the correlation between the degree of well interference and various influencing parameters was calculated for the well pads from the Ordos Basin.The main controlling fac

关 键 词：井间干扰 纵向干扰 关联度分析 立体开发 页岩油 

分 类 号：TE319[石油与天然气工程—油气田开发工程]