斜交裂缝对水平井产量影响模拟方法探讨

Preliminary simulation method of hydraulic heterotropic fractures on production of horizontal well

鄢雪梅 王欣 谢正凯 王永辉 李永平 段瑶瑶

中国石油勘探开发研究院廊坊分院，河北 廊坊 065007 中国石油集团科技管理部，北京 100007

为了探讨水平井筒方向对分段压裂产量的影响，文中采用数值模拟方法，在系统划分网格的基础上，运用Eclipse软件中的近井模型（NWM），建立起包含水平井筒和斜交裂缝的数值模拟模型，通过定义水平井筒与最小水平主应力不同夹角相对于0°时的减产率来表征斜交裂缝对压后产量的影响。结果表明：随着地层渗透率的增加，井筒方向对压裂产量影响程度减小；地层渗透率大于0.005×10-3 μm2，当水平井筒与最小水平主应力夹角小于30°时，减产率小于3%。该研究成果为水平井钻井方向的选择提供了理论依据。

In order to investigate the influence of horizontal well direction on the production after multi-stage fracturing, based on the systematical gridding, this paper uses reservoir simulation method and the NWM model in Eclipse to build the simulation model containing the horizontal well and heterotropic fractures, which is the key to simulation of heterotropic fractures. In addition, we define the production reduction rate to indicate the influence of horizontal well direction on the production after fracturing. Results indicate that the influence of horizontal well direction on production reduces as the formation permeability increases; when the formation permeability is higher than 0.005 md and the intersection angle between the horizontal well and the minimal horizontal in-situ stress of the formation is smaller than 30°, the production reduction rate is less than 3%. This study can provide theoretical basis for the drilling direction design of horizontal well.

10.6056/DKYT201306027