【摘要】 由于水平井水平段井筒摩擦的存在,长水平井的产能不随水平段长度的增加而按比例无限制地增加,因此提出一种新的方法来预测长水平井在考虑井筒摩擦损失时的采油指数,该模型考虑水平井井眼附近地层的损害。研究表明,水平段长度存在一个临界点,使得井筒压降梯度突然增大而采油指数增长率突然减小。此研究可以为水平井现场设计提供理论依据。更多还原

【Abstract】 Because of frictional losses in the wellbore, productivity of horizontal well is not proportional increase infinitely while the well length increasing. A new method is advanced for forecasting the productivity index of long horizontal wells with friction losses in this paper. Influence of wellbore damage near the horizontal wellbore is also considered in the model. The study shows that there is a critical point, where rate of friction pressure suddenly increases and productivity index decreases abruptly with increase in horizontal well length beyond this point. The research can provide us with theories for field designing of horizontal well.更多还原