基于井间连通性的致密油藏注水井动态裂缝研究

Study on dynamic fracture of injection well based on inter-well connectivity in tight oil reservoir

曾庆桥 张亮 刘萍 王哲 王链 赵良言 李治平

中国石油华北油田分公司勘探开发研究院，河北 任丘 062552 成都北方石油勘探开发技术有限公司，四川 成都 610051 中国地质大学（北京）能源学院，北京 100089 中国石油华北油田分公司第五采油厂，河北 辛集 052300

在致密油藏注水开发过程中，由于压力场和应力场的变化引起注水井人工裂缝的开启闭合，会对注水效果产生重要影响。定量表征注水井裂缝的动态变化是注水开发致密油藏的关键。文中提出了将不同裂缝参数下油藏数值模拟的生产动态数据代入油藏容阻模型，获得不同的注采井井间连通性数据，并建立了裂缝参数与连通系数的支持向量回归代理模型的方法。利用该方法对反五点井网注水井动态裂缝变化特征进行分析，结果表明：建立的代理模型对裂缝参数的预测误差较小，为致密油藏注水开发中裂缝动态变化分析提供了简单快速的方法。

 In the process of water flooding development of tight reservoir, the opening and closing of artificial fractures in water injection wells caused by the change of pressure field and stress field has an important impact on water injection effect. Quantitative characterization of dynamic changes of fractures in water injection wells is the key to water flooding of tight oil reservoir. In this paper, the production performance data of reservoir numerical simulation under different fracture parameters are brought into the reservoir capacitance resistance model, and the different connectivity data of injection and production wells are obtained, and the support vector regression surrogate model of fracture parameters and connectivity coefficient is established. The method in this paper is used to analyze the dynamic fracture characteristics of water injection wells in reverse five point pattern. The results show that the error of prediction results of fracture parameters by the established surrogate model is small. This model provides a simple and rapid method for the analysis of fracture dynamic change in water flooding development of tight oil reservoir.

10.6056/dkyqt202203016