摘要
针对BZ油田进入中高含水期,平面水驱不均问题,为认清水平井网水驱油规律,从而指导井网水驱调整以及剩余油挖潜,通过大岩心物模实验和数值模拟两种手段对3种水平井网水驱油规律进行研究。结果表明:联合水平井平行井网的含水率上升最快,无水采油期时间最短,驱油效率居中;联合水平井交错井网的含水上升率居中,无水采油期时间居中,驱油效率最高;水平井-定向井联合井网的含水率上升较缓慢,无水采油期时间最长,但驱油效率最低。不同注水方式水平井交错井网波及系数整体高于平行井网,对于水平井平行井网来说采用一增一降强弱交替注水波及系数最高,而两种周期注水方式波及系数较低。对于水平井交错井网来说,不同注水方式平均水驱波及系数相比平行井网高2.5%,可以说交错井网为最优的井网形式。边井限注、角井增注可以扩大水平井间流线波及范围,提高对滞留区剩余油动用,因此波及系数最高,其他注水方式水驱波及系数差异不大。
Aiming at the problem of uneven water flooding in BZ oilfield when it enters the middle and high water cut stage, in order to understand the water flooding law of horizontal well pattern, guide the adjustment of well pattern and tap the potential of remaining oil, three kinds of water flooding law of horizontal well pattern were studied by means of large core physical model experiment and numerical simulation. The results show that the water cut of parallel well pattern of combined horizontal well rises fastest, the time of anhydrous production is shortest, and the displacement efficiency is in the middle. The water cut riserate of staggered well pattern of combined horizontal wells is in the middle, the time of an- hydrous production period is in the middle, and the displacement efficiency is the highest. The water cut of horizontal well-directional well pattern rises slowly, the period of anhydrous production is the longest, but the displacement efficiency is the lowest. The sweep efficiency of horizontal wells in different water injection modes is higher than that of parallel wells,the two cycle water injection mode has low sweep efficiency. For staggered well pattern of hori- zontal well, the average sweep coefficient of water flooding with different injection methods is 2.5 % higher than that of parallel well pattern, which can be said that staggered well pattern is the optimal well pattern. Border well injection restriction and angle well injection increase can expand the sweep range of streamline between horizontal wells and improve the residual oil production in the remaining area, so sweep coefficient is the highest, and the sweep coef- ficient of other water flooding methods is not much different.
作者
孙广义
刘英宪
翟上奇
吴晓慧
程大勇
SUN Guangyi;LIU Yingxian;ZHAI Shangqi;WU Xiaohui;CHENG Dayong(Bohai Petroleum Research Institute,CNOOC,Tianj in 300459,China)
出处
《石油化工应用》
CAS
2018年第10期24-28,共5页
Petrochemical Industry Application
基金
"十三五"国家科技重大专项"渤海油田加密调整及提高采收率油藏工程技术示范"部分研究成果
项目编号:2016ZX05058001
关键词
水平井
注采井网
水驱油规律
大岩心物模实验
波及系数
horizontal well
injection and production well network
law of water flooding
experiment of big rock core
sweep efficiency
