利用遗传算法进行水平井水平段长度优化设计

在油藏开发过程中,随着水平井水平段长度的增加,水平井段与油藏的接触面也随之增加,同时井筒内流体的流动阻力也增加,从而导致水平井的产液量减少,即水平井的最终产量是2个相互制约的因素共同作用的结果。利用遗传算法全局寻优的特点,结合一种计算无限导流和有限导流情况下水平井产量的井筒/油藏耦合模型,提出了一种用于水平井水平段长度的优化设计方法。该方法可以在不同的油藏地质模型中使用。

Optimum design of the horizontal section length in a horizontal well using genetic algorithm

As the length of a horizontal well section increases, the contact area between the horizontal well and reservoir increases. At the same time, the resistance to fluid flow in the horizontal well also increases, which has a negative effect on the fluid productivity of a well. The overall performance depends on the balance of the above two opposing factors. According to a reservoir-wellbore coupling model for calculating the fluid productivity of a horizontal well under the conditions of the infinite-conductivity and finite-conductivity, the genetic algorithm was used to find a general optimal solution. A methodology for designing the optimum length of the horizontal section in a horizontal well was developed. This method can be run under a variety of constraints.