多层合采稠油油藏蒸汽吞吐后期油藏物性特征——以孤岛油田中二中Ng5砂层组为例  

The study of physical properties characteristics after mature steam stimulation in multi-layer heavy oil reservoir-taking Zhongerzhong Ng5 in Gudao oilfield as an example

作　　者：王代流[1,2] 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石化胜利油田分公司孤岛采油厂,山东东营257231

出　　处：《油气地质与采收率》2013年第3期68-71,115-116,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"蒸汽驱后稠油油藏提高采收率技术研究"(2011ZX05009-004)

摘　　要：孤岛油田中二中Ng5砂层组为多层稠油油藏。该油藏经过多轮次蒸汽吞吐开发后,由于其主力层Ng53和Ng54层的合注合采及蒸汽超覆的影响,导致层间动用差异程度大及油藏物性分布不均衡。利用数值模拟技术,研究多层合采稠油油藏蒸汽吞吐后期的油藏物性特征,主要包括油藏压力和油藏温度、剩余油饱和度、剩余油储量丰度。研究结果表明:截至2011年9月,经多轮次蒸汽吞吐生产后,研究区Ng5砂层组的压力保持水平仅为42.93%,平均地层温度上升约2℃;Ng5砂层组中吞吐井数少的区域控制程度低,是高剩余油饱和度分布的区域;剩余油储量丰度不仅与剩余油饱和度有关,还与油层的有效厚度密切相关;高剩余油储量丰度区域主要位于构造高部位及距离边水较远的部位。Zhongerzhong Ng5 is a multi-layer heavy oil reservoir in Gudao oilfield. There are two major productive layers, such as Ng53 and Ng54 , in Ng5 formation. The commingling production and the steam overlap result in large production difference among oil layers in Ng5 formation. Therefore, the distribution of reservoir properties is more and more disequilibrium after multiround of steam stimulation. In this article, numerical simulation technology was employed to analyze distribution characteristics of reservoir properties, such as remaining oil saturation, remaining oil abundance, reservoir pressure and temperature, in multi-layer heavy oil after mature steam stimulation. The results show that high remaining oil saturation is mainly distributed in an area with less production wells. The remaining oil abundance is related to not only remaining oil saturation, but also effective thickness of reservoirs closely. The area of large remaining oil abundance is located in high position of reservoirs or is far from edge water zone. Until September 2011, the pressure level was only 42.93% and the average temperature rose about 2 ℃ in Ng5 formation. Based on the results of numerical simulation, we can provide a guide for the separate zone steam injection or steam flooding method to enhance oil recovery in multi-layer heavy oil reservoirs.

关 键 词：蒸汽吞吐 数值模拟 剩余油分布 稠油油藏 多层合采 孤岛油田 

分 类 号：TE345[石油与天然气工程—油气田开发工程]