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针对断块油田断层附近水平井产能预测难度较大的问题,采用离散化处理方法建立了断层附近油藏渗流和水平井井筒管流耦合模型,通过实例计算证明了模型的准确性。改变断层与井筒相对位置发现,井筒与断层平行时径向入流剖面呈“U”型分布;井筒距离断层越近产能越低,且产能降低幅度逐渐增大,当井筒紧贴断层时,产能降低为无断层时的一半。井筒与断层垂直时,远离断层端径向流量高于靠近断层端,且距离断层越近,跟趾端差异越明显、产能越低、产能降低幅度越大。断层附近水平井跟端靶点固定时,建议井眼轨迹垂直且远离断层,该情况下单井产能最高。整体上,井筒到断层距离对产能影响较大,井筒与断层夹角对径向入流剖面影响较大,这对断层附近水平井井眼轨迹设计具有一定指导意义。
In order to predict the productivity of horizontal wells near fault faults in fault block oilfield, the coupling model of reservoir seepage and horizontal well tube flow near the faults is established by discretization method. The accuracy of the model is verified by an example calculation. Changing the relative position between the fault and the wellbore, it is found that the radial inflow profile of the wellbore and the fault is “U” -shaped distribution. The lower the productivity of the wellbore is from the fault, and the decreasing rate of productivity increases gradually. When the wellbore is close to the fault, Production capacity is reduced to half without breaking. When the wellbore is perpendicular to the fault, the radial flow away from the fault end is higher than that near the fault end, and the closer the fault is to the fault, the more obvious the difference is with the toe end. The lower the productivity is, the greater the reduction of capacity is. It is recommended that the wellbore trajectory be vertical and away from the fault when the horizontal well is near the fault with the target. In this case, the single well has the highest productivity. Overall, the influence of wellbore-fault distance has a great influence on productivity, and the influence of wellbore-fault angle on radial inflow profile is significant, which is of guiding significance for the design of horizontal well trajectory near the fault.