摘要
研究岩心CO2驱油含油饱和度的变化特征,对于优化油藏开采方式、制定提高采收率方案具有积极的指导意义。通过对长庆西峰油田西137区块取心岩心CO2驱油过程进行CT扫描,实现了CO2驱油过程中含油饱和度分布可视化;并率先推导出了该过程中含油饱和度的计算方法。在较高的精度下计算出了驱替过程中的含油饱和度。研究表明,驱油过程开始后,含油饱和度首先从入口段开始大幅度下降,直到在出口段突破;然后,整个岩心中各个截面处的含油饱和度都开始下降,最终达到一个很低的数值,驱油效率很高。进一步该项工作可以为研究低渗透储层的渗流机理提供一个新的视角,并为低渗透油藏CO2驱油开采方式的现场应用提供借鉴。
Studying the oil saturation in CO2 drive is of great significance for field development and enhanced oil recovery. Through scanning cores from West 137 block in Changqing Xifeng oilfield, the change of oil saturation in CO2 drive is visualized. Then a new calculation method is given for oil saturation and precisely get the distribution of oil saturation in this process. Studies show that, oil saturation fall quickly from the inlet as soon as the beginning of drive until CO2 breakthrough at the outlet;Then, oil saturation of all slices in the core begin to fall gradually to a very low value, which indicates a high recovery. Further, this work can actually give a new point of view for studying the seepage mechanism in low permeability reservoir, thus providing a reference for the application of CO2 drive in field.
出处
《科学技术与工程》
北大核心
2014年第14期198-201,共4页
Science Technology and Engineering
基金
中国石油天然气股份有限公司科技管理部项目资助
关键词
低渗透
二氧化碳驱
含油饱和度
CT扫描
长庆
low permeability carbon dioxide drive oil saturation CT scanning Changqing
