中东地区典型Mishrif储层纵向水驱渗流规律

Longitudinal Water Flooding Seepage Law of Typical Mishrif Reservoir in the Middle East

以中东地区B油田为例分析了典型Mishrif组碳酸盐岩储层的纵向渗流规律,在当前注水压差和射孔高差下,底部注入水将窜入顶部高渗层,形成上下两个渗流通道。基于流线模拟,分析了典型底注顶采连通模式下的波及影响因素及定量认识。结果表明:典型底注顶采模式下,顶部和底部采出程度高,中部采出程度低;注水压差越小、射孔高差越大有利于增加储层中部和底部的波及程度;注水井附近存在夹层模式优于生产井附近存在夹层模式,有利于延缓油井见水;高渗透贼层降低了波及体积,其发育程度越高,注入水窜现象越严重。在此基础上,提出内部温和注水和水平井注水是此类油藏底注顶采开发的有效优化策略。

Taking the B oilfield in the Middle East as an example,the longitudinal seepage law of the typical Mishrif carbonate reservoir was analyzed.Under the current water injection pressure difference and perforation height difference,the bottom injection water would break into the top high permeability layer,forming both upper and lower seepage channel.Based on the streamline simulation,water flooding law and influencing factors for low-injection and top-production mode was studied by a set of typical model.Results show that high recovery is obtained for top and low layers under this typical water injection mode.With smaller water injection pressure difference and larger perforation height difference,the sweep efficiency of the middle and bottom of the reservoir is improved.The production performance is better when the interlayer is near the injection well compared with the case that the interlayer is near the production well.The thief zone reduces the sweep efficiency,and with higher development of thief zone,channeling problem is more serious.On this basis,it was proposed that the internal gentle water injection and horizontal well water injection are effective optimization strategies for the development of such reservoirs.