以产量为目标的水平井最优井筒长度

目前在研究水平井水平段长度优化时,大多采用Dikken优化原则,即当摩擦损失减少了20%产能时的长度为最优水平井长度。考虑水平井筒内的摩擦压降的同时,建立了油藏内流动模型、水平井井筒内流动模型、耦合水平井与油藏渗流,利用井筒内流体质量守恒定律,以产量为目标推导了油藏水平井水平段最优长度公式。对其敏感性参数作了分析并讨论摩擦压降对产能的影响。该模型既可以确定合理的水平井筒段长度,同时对水平井长度的优化设计具有指导意义。

Optimization of the Horizontal Wellbore Length Based on Productivity

At present, the Dikken optimization principle is mostly applied during research on the horizontal length optimization of horizontal wells,namely when the friction loss reduces by 20%, the corresponding length is the optimal length of the horizontal well. Considering the friction pressure drop in the horizontal wellbore, the flow model in the oil reservoir, the flow model in the horizontal wellbore, coupling horizontal well and oil reservoir seepage were established. Using the conservation law of the fluid mass in the wellbore,based on the production capacity, the oil reservoir horizontal well optimum length formula was derived. And its sensitivity parameters were analyzed ,and influence of the friction pressure drop on the production capacity was discussed. The model can determine the reasonable horizontal wellbore length ,and is useful for the design of the horizontal well length.