水平井水平段长度优化原则

Optimization Principles for Horizontal Wellbore Length

目前,水平井水平段长度的优化大多采用Dikken提出的优化原则,即水平段最优长度是当摩擦损失减少了20%产能时的长度。在建立水平井水平段长度优化数学模型的基础上,给出一定油藏、流体条件下水平井极限产量的计算公式;结合油藏实例,分析了Dikken优化原则的合理性,认为以该原则计算的水平段长度不能充分发挥水平井开发油藏的潜力,相对于极限产量而言,采出程度较低;得出了以极限产量为优化标准时水平段长度的计算方法;分析了两种优化原则之间的关系。该研究对水平井开发优化设计具有指导意义。

At present,the optimization of horizontal wellbore length is based on Dikken＇s principle in most cases,that is,the optimal horizontal wellbore length is the length that the production decreases by 20% due to the friction loss.A formula is derived from the mathematic model of optimal horizontal wellbore length to calculate the ultimate output for horizontal well in definite reservoir and fluid condition.Integrated with case analysis,the rationality of Dikken＇s principle is analyzed.It is suggested that the horizontal wellbore length calculated by Dikken＇s principle cannot reach its full potential in reservoir development,and with the contrast to the ultimate output,the recovery percent is relatively low.This paper proposes the calculation method for optimal horizontal wellbore length on the basis of the ultimate output principle and analyzes the relationship between such two optimization principles.The study is of significance for guiding horizontal well development and optimization design.