高含水油藏微观剩余油渗流机理与孔喉动用特征  

Microscopic Residual Oil seepage Mechanism and Pore Throat Producing Characteristics in High Water-Cut Reservoirs

作　　者：周宗良[1] 张凡磊[1] 刘斌 刘建[3] Zhou Zongliang;Zhang Fanlei;Liu Bin;Liu Jian(Exploration&Development Research Institute of PetroChina Dagang Oilfield,Tianjin,300280,China;Installation Institute of Offshore Oil Engineering Co.,Ltd.,Tianjin,300450,China;School of Geosciences,Yangtze University,Wuhan,Hubei,430100,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院,天津300280 [2]海洋石油工程股份有限公司安装事业部,天津300450 [3]长江大学地球科学学院,湖北武汉430100

出　　处：《新疆地质》2021年第2期275-279,共5页Xinjiang Geology

基　　金：中国石油天然气股份有限公司重大科技专项大港油区效益增储稳产关键技术研究与应用(2018E-11)资助。

摘　　要：基于港东油田密闭取心分析化验,开展微观渗流机理特征、孔喉动用特征及水驱过程中不同孔径剩余油饱和度定量分布研究。数学物理推理表明,毛细管半径与渗流流速呈平方级数关系,这种关系得到压汞实验数据分析及微观渗流实验证实。通过核磁共振成像岩心微观驱替实验分析,认为水驱过程中不同岩样、不同驱替阶段、不同注水倍数水驱后剩余油分布情况不同。驱替20 PV以前,中、大孔喉水驱效果较好,小孔喉的油少量动用;驱替20 PV以后,主要是小孔喉的油被驱替出。小于0.01μm的微孔喉表现为先微幅升高后回落,最终回到原始状态。实验表明,水驱油主要发生在中、大孔喉及部分小孔喉中,对微孔喉中剩余油无明显效果。The article is mainly based on the analysis and testing of airtight coring in Gangdong Oilfield.Researches on the characteristics of microscopic seepage mechanism,pore throat production and the quantitative distribution of residual oil saturation of different pore diameters during water flooding are carried out.Mathematical and physical inferences show that the radius of the capillary tube is related to the seepage flow velocity in a square series.At the same time,this relationship has also been confirmed by the analysis of mercury intrusion experiment data and the analysis of microfluid-ics experiment data.Based on the analysis of nuclear magnetic resonance imaging core micro-displacement experiments,it is believed that the residual oil distribution after water flooding about different rock samples,different displacement stages and different water injection multiples is different in the water flooding process.Before the displacement of 20PV,the water flooding effect of medium and large pore throats was better,and a small amount of oil with small pore throats was produced.After the displacement of 20PV,the oil of the small pore throat was displaced mainly.However,the oil sat-uration of micro pore throats of less than 0.01μm increased slightly at the initial stage and then decreased,and finally re-turned to the original state almost.Experiments show that water flooding mainly occurs in medium and large pore throats and some small pore throats,and water flooding has no obvious effect on the remaining oil in micro pore throats.

关 键 词：渗流机理 孔喉动用特征 剩余油饱和度 高含水油藏 核磁共振 

分 类 号：O357.3[理学—流体力学]