高含水后期厚油层水平井射孔层段优选设计

由于高含水后期厚油层的剩余油多数分布在油层顶部及层内变差部位，且分布形式比较零散，水平井完钻后，其水平轨迹无法保证全部处于剩余油区域内，所以为避免高水淹层段水窜、避免底部注入水过早突破，在南1-2-平25井射孔完井时，应用多种技术手段对射孔层段进行优选设计：首先应用水平井水淹综合解释技术，初步选择低水淹层段；再应用曲流河沉积油层的内部建筑结构研究技术，从初选的低水淹层段中优选避水层段；最后应用储层建模技术，依据射孔层段处于油层中的位置，优选设计射孔相位角．在该井630m的水平井段，优选射孔层段3个，长度为291m，射孔投产后，成功地控制了初期含水率，减缓了生产过程中的含水上升速度，取得了较好的开发效果。

Horizontal Well Perforation Interval Optimization Design to Thick Oil Layers at Later Stage of High Water Cut Development

Since the remaining oil in thick oil layers at later stage of high water cut is usually distributed at the top of layers or at various parts inside the layers and distribution pattern is quite scattered,the horizontal track of horizontal well after drilling can not be guaranteed to be totally in remaining oil zone.To avoid water breakthrough in high water flooding intervals and bottom injected water breakthrough too early,many technical methods are adopted to optimize the design of perforation intervals in the perforation and completion of Well Nan 1-2-Ping 25.First,horizontal well water flooding comprehensive interpretation techniques are applied to select the primary low flooding intervals.Then the internal architecture structure research technique in meandering stream deposit oil layers is applied to optimize the water avoiding intervals among the primarily selected low flooding intervals.Finally,reservoir modeling technique is applied to optimize the design of perforation phase angle according to the position of the perforation interval in the oil layer.Three perforation intervals are optimized in the horizontal well section with a distance of 630m.The intervals have a total length of 291m with different perforation phase angles.Since Well Nan 1-2-Ping 25 was brought into production after perforation,the primary water cut is successfully controlled and water increasing speed during production process is slowed down and a good development effect has been achieved.