注采耦合技术提高复杂断块油藏水驱采收率——以临盘油田小断块油藏为例  

Research on unstable injection-production to improve oil recovery in complicated fault block of Shengli oilfield-case study of fault block oil reservoirs in Linpan oilfield

作　　者：王建[1] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2013年第3期89-91,117,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"断块油田特高含水期提高水驱采收率技术研究"(2011ZX05011-003)

摘　　要：复杂断块油藏具有断块小、纵向上小层多的特点,注水开发后期剩余油分布受控于平面和层间非均质性,常规注水提高采收率较为困难。应用注采耦合技术可提高复杂断块油藏剩余油的动用程度,以临盘油田三角形封闭断块油藏为数值模拟研究模型,结合其地质特点及剩余油分布将其划分为7个特征区,研究注水和开采过程中各特征区的压力、剩余油饱和度以及液流速度的变化特征。结果表明,注采耦合技术注水阶段在压差作用下,中心区剩余油被水驱至夹角区和夹角间区,并在开采阶段随压力降低而采出;中心区的剩余油饱和度动用程度最高,为5.2%。利用数值模拟方法对注采耦合周期内的压力恢复水平、压力保持水平以及注采比等参数进行了优化,优化结果为油藏压力系数保持在0.8～0.9,采用注采比为1.5恢复压力。注采耦合技术通过复杂断块油藏内压力的交替变化,改变油藏内流场,扩大油藏水驱波及面积,从而提高复杂断块油藏的剩余油动用程度和水驱采收率。By means of analysis on the development characteristics of the complex fault block oil reservoir, and based on the characteristics of remaining oil distribution of the fault block oil reservoir and unstable water injection measures adaptability, and considering the successful experience that the unstable water injection can improve the recovery, we put forward a new treatment for developing complex fault block oil reservoir combined with unstable water injection. First of all, in response to the typical triangle block characteristics and remaining oil status, the reservoir is divided into seven areas, and then we use numerical simulation method to study the pressure, saturation and fluid flow velocity variation characteristics of each area, and then adopt two processes. The simulation results show that the section between angles drives the remaining oil to central section, but the angle section itself contributes less. In order to fully perform unstable injection-production with multilayer characteristics of fault block oil reservoir, we design unstable injection-production coupling method to develop residual oil of complex fault block, and further enhance the water driving recovery factor for complex fault block oil reservoir.

关 键 词：复杂断块油藏 注采耦合 特征区 数值模拟 水驱采收率 

分 类 号：TE347[石油与天然气工程—油气田开发工程]