复杂断块油藏水平井开发与封闭断层关系

Relationship between horizontal well development and sealed fault for complex fault-block reservoir

复杂断块油藏断层封闭性对多数油层的剩余油有控制作用,一般情况下,封闭性断层附近含油饱和度较高,采用直井和水平井相结合的布井方式可以充分发挥直井钻遇油层层数多和水平井与油层接触面积大、产量高的优势,从而提高复杂断块油藏剩余油挖潜的开发效果。研究了水平井与断层夹角、各种井网形式下水平井距断层距离和水平井段长度的关系。结果表明,水平井与断层的夹角呈90°时采出程度最高,在相同的水平井井段长度情况下,90°井网形式最好。该结论对断层附近水平井布井具有一定的借鉴作用。

The sealed fault of complex fault-block reservoir has the control action to the distributing of remaining oil in many reservoirs. Normally, the oil saturation is relatively high nearby sealed fault. Combination of horizontal well and vertical well can display the high drilling ratio of vertical well, large area of oil layers connected and high production of horizontal well. Thus development effect of remaining oil can be enhanced in complex fault-block reservoir. This pater analyzes the relationships between the angle of horizontal well and sealed fault, and the distance of horizontal well to fault and hole section length for different well pattern forms. The results show that the recovery percent is highest when the angle of horizontal well and the sealed fault is 90°. Under the condition of same length of horizontal well section, 90° well pattern form is best. This conclusion can be used as a reference to the well pattern of horizontal wells nearby sealed fault.