基于自示踪的聚驱油藏窜流通道量化模型及应用  

Modeling and application of channeling path quantification during polymer flooding process based on self-tracing method

作　　者：孟祥海 刘同敬[2] 李彦阅 刘长龙 薛宝庆 吕鹏 王楠 第五鹏祥 MENG Xianghai;LIU Tongjing;LI Yanyue;LIU Changlong;XUE Baoqing;LYU Peng;WANG Nan;DIWU Pengxiang(CNOOC China Limited,Tianjin Branch,Tianjin 300452,China;Unconventional Petroleum Research Institute,China University of Petroleum,Beij ing 102249,Ch ma;College of Science,Ch ina University of Petroleum,Beij ing 102249,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [3]中国石油大学(北京)理学院,北京102249

出　　处：《中国海上油气》2022年第5期108-116,共9页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“渤海双高油田堵/调/驱一体化方案设计技术研究及示范(编号:2016ZX05058-003-011)”;国家重点研发计划项目“低渗透油藏CO_(2)驱油与封存油藏工程方法及协同优化技术(编号:2018YFB060550102)”部分研究成果。

摘　　要：海上高渗砂岩油藏聚驱开发过程中因强注强采极易产生聚合物窜流现象,严重影响聚驱开发效果。为快速、准确识别聚驱油藏窜流通道量化信息,首次提出“自示踪”的概念,视注入的流体(水和聚合物)为自示踪剂。然后依据窜水通道和窜聚通道的空间分布特征,建立三维聚驱窜流通道物理模型。再利用降维方法建立基于自示踪的聚驱窜流通道渗流数学模型,求出考虑窜水通道和窜聚通道影响的产出端含水率和产聚浓度的解析解,实现了基于自示踪的聚驱窜流通道量化解释。通过分析窜水通道和窜聚通道解释参数对产出端含水率和产聚浓度的敏感性可知,等效扩散系数和窜水通道厚度比例,对见水时间和含水率最大值的影响较为明显,扩散系数和相对窜水通道的渗透率级差,对见聚时间的影响较为明显。海上油田应用实例表明,该方法可以快速获得水淹井注采井间窜水通道和窜聚通道的量化信息,包括窜流通道厚度比例、渗透率级差、(等效)扩散系数、吸附系数,为快速识别窜流通道发育状况以及指导后续窜流通道治理和开发方案制定提供科学依据。During the process of polymer flooding in offshore high-permeability sandstone reservoirs, the polymer channeling phenomenon is very likely to occur due to strong injection and production, which seriously affects the performance of polymer flooding. In order to quickly and accurately identify the channeling path quantification information during the polymer flooding process, the novel concept of “self-tracing” is proposed, in which the injected components(i.e., water and polymer) are regarded as the self-tracer. Then, a three-dimensional(3 D) physical model considering channeling path during the polymer flooding process is established according to the spatial distribution characteristics of the water and polymer channeling path. Furthermore, the self-tracing-based mathematical model considering channeling path seepage during the polymer flooding process is established based on the dimension-reduction method to obtain the analytical solutions of the water cut and polymer production concentration considering the influence of water and polymer channeling path, thus realizing the quantitative interpretation of channeling path during the polymer flooding process. Sensitivity analyses are conducted to assess the effect of channeling path interpretation parameters on the water cut and polymer production concentration. It is found that the equivalent diffusion coefficient and the thickness ratio of the water channeling path have obvious effects on the water breakthrough time and the peak value of the water cut curve, while the diffusion coefficient and the relative permeability ratio of the water channeling path significantly affects the polymer breakthrough time. The application case in offshore oilfields shows that by using the proposed method, it is possible to quickly obtain quantitative information of the water and polymer channeling path between flooded out wells and injection and production wells, including the thickness ratio of channeling path, permeability ratio,(equivalent) diffusion coefficient and adsorp

关 键 词：聚合物驱 窜流通道 自示踪 数学模型 量化识别 

分 类 号：TE343[石油与天然气工程—油气田开发工程]