鱼骨型多分支井产能预测公式推导及影响因素分析

Productivity Prediction and Its Influencing Factors for Herring Bone-Like Laterals Well

针对鱼骨型多分支井的产能预测问题,采用渗流场剖分的方法,应用保角变换法和等值渗流阻力法,推导出了一种产能计算公式。根据某底水油藏的鱼骨型多分支水平井的有关数据,运用此公式计算其产能,所得结果与该井的实际生产数据接近,相对误差较小。公式因素分析表明:主井筒及分支井筒长度的变化对产能的影响较大,主井筒长度的增加会大幅增加鱼骨型多分支井的产能。在生产实践中,可考虑通过增加主井筒和分支井筒的长度来保证鱼骨型多分支井产能的最大化。

The productivity formula of herringbone-like laterals well is deduced by applying the method of seepage field partition,conformal transformation and equivalent seepage resistance method.According to the data of herringbone multilateral well in a bottom water reservoir,using this formula to calculate its productivity,the result is close to the actual production data of the well,and the relative error is small.The results show that with the increase of main wellbore length and lateral wellbore length,productivity of herringbone-like laterals well becomes big.The increase of the length of the main wellbore will greatly increase the productivity of herringbone multilateral wells.In production practice,it can be considered to increase the length of main wellbore length and branch wellbore length to ensure the maximum productivity of fishbone multi branch well.