丛式水平井组在复杂断块油藏开发中的应用研究

Applying cluster horizontal wells to the development of complicated fault-block reservoirs

胜利油田永 8复杂断块油藏的特点是断层多、油层层数多、含油面积小、储量丰度高 ,开发过程中油层易出砂 ,直井产量低。水平井的优点是泄油面积大、生产压差小、产量高。在优选水平井在断块平面和油层纵向的位置、水平段长度等基础上 ,设计并实施了永 8 X4块的一个丛式水平井组。该水平井组投产初期的平均日产量是直井的两倍 ,实现了高效开发复杂断块的目的。

The complicated Yong 8 fault block reservoir in Shengli oil field, with many faults, multiple oil bearing formations, high reserve abundance and high oil viscosity, is easy to produce sand. Production rates of vertical wells are low. The production rate of horizontal well is high with small producing pressure drop, for its oil drainage area is larger than that of the vertical well. On the basis of the optimization of the plane location in fault block, the vertical position in oil bearing formation and the horizontal interval length for the horizontal well, cluster horizontal wells are designed for Yong 8 fault block. In the early stage of production, the average production rate of the horizontal well is twice than that of the vertical well. The fault block is developed much efficiently.