水平井注采井网优化

为查明水平井注采井网的开发效果及其与传统直井注采井网的区别，采用数值模拟方法研究水平井注采井网部署方案。结果表明：与直井注水相比，水平井注采井网可形成线性驱动，推迟注入水突破时间、提高波及效率、改善油藏开发效果；水平井水平段压力损失影响水平井注水开发效果，平行对应反向井网考虑了压力损失的影响，可有效地克服压力损失造成的注入水局部突进现象，平行交错反向指指井网既考虑了水平段压力损失的影响，又可扩大井网控制面积，为最优的水平井注采井网；对于均质薄层油藏，水平井在油藏中位置的变化对开发效果的影响不明显。水平井注水技术在哈得4薄砂层油藏的开发中起到了降低注入压力、增加注入量、有效保持地层压力的作用，所设计的水平井注采井网应用效果良好。图13表4参31

Optimization of horizontal injection and production pattern

To investigate its development efficiency and difference from vertical injection pattern,horizontal injection pattern was studied using reservoir simulation.Compared with vertical injection pattern,horizontal injection pattern can form linear drive to put off water breakthrough, improve sweep efficiency and recovery.Pressure loss on the horizontal section of horizontal wells impacts on the horizontal well waterflooding.Corresponding parallel horizontal well pattern in opposite direction decreases the effect of pressure loss and can overcome local water breakthrough.Stagger parallel horizontal well pattern in opposite direction(horizontal producer toe to horizontal injectior toe),the best pattern,takes into account pressure loss and can enlarge the pattern-controlled area.The locations of horizontal injector and producer in thin homogeneous layers do not influence the recovery obviously.In a case study of Hader 4 thin sandstone reservoir in Tarim Oilfield,horizontal injection-production pattern decreased injection pressure,improved injection rate and the ability of keeping field pressure.