多轮次调剖效果逐次递减机理研究

针对注水井多轮次调剖存在的增油效果逐次递减的现象,应用平板物理模型、油藏数值模拟方法研究了多轮次调剖效果逐次递减的机理。结果发现,多轮次调剖效果逐次递减的机理主要有五个,即多轮次调剖影响面部分重叠、调剖效果随径向距离增加而减弱、封堵时机引起调剖效果逐次递减、注入工艺引起调剖效果逐次递减和堵剂部分失效引起调剖效果逐次递减等。通过应用多轮次调剖系列堵剂、适当增加堵剂用量、优化每一轮调剖的封堵时机和注入压力,可以减缓多轮次调剖效果的逐次递减。

Mechanism study on successive decline of incremental oil effect during multicycle profile control

ming at the existence of successive decline of incremental oil effect during multicycle profile control in the waterflood input wells, the corresponding mechanism is researched using the methods of flat physical model and reservoir numerical simulation. It is revealed that five aspects are responsible for the effect decline, that is, the partial overlapping of influence region of the blocking agents, the further radial blocking depth, the unreasonable blocking timing, the unfavorable injecting technology and the invalidity of blocking agent. The successive decline of incremental oil effect by multicycle profile control would be reduced through applying series of blocking agents, increasing volume of blocking agents properly, optimizing blocking timing and injection pressure in each cycle.