各向异性油藏定向井射孔完井表皮因子模型研究

Research of skin factor model for perforated directional well in anisotropic reservoir

陈勇光 吴晓东 安永生

CHEN Yongguang WU Xiaodong AN Yongsheng ZHANG Mingjiang

中国石油大学石油工程教育部重点实验室，北京　102249

MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China

基于坐标转换和空间变换，将各向异性空间的地层几何参数和完井几何参数变换到各向同性空间，将得到的各参数??过等效处理后代入到各向同性空间的表皮因子模型，从而推导出适应于各向异性油藏定向井射孔完井的表皮因子计算模型，该模型考虑了储层伤害和压实带效应对表皮因子的影响。用有限元方法验证了该模型的准确性，并应用该模型进行了实例计算。该模型适应范围广，可用于定向井的完井设计和产能预测。

Based on the theories of coordinate conversion and space transformation, this paper first transforms the geometric parameters of reservoir and completion in anisotropic space into isotropic space. Then it substitutes these parameters after equivalent treatment into the skin model in isotropic. Finally a computation model is developed for calculating the skin of directional wells with perforated completion in anisotropic reservoirs. The effect of formation damage and a crushed zone is considered in the model. The model proved to be right through finite element method, and a practical example was computed also. The model has wide adaptation range and may provide help for completion design and productivity prediction of directional wells.