基于真实砂岩微观水驱油实验的低渗透储层流体渗流特征及驱油效率影响因素研究:以姬塬油田王盘山长6储层为例  

Fluid Seepage Characteristics of Low Permeability Reservoir Based on the Real Sandstone Microscopic Water Flooding Experiment:Taking the Chang 6 Reservoir in Wangpanshan as an Example

作　　者：韩进 孙卫[1,2] 白云云[4] 张茜 樊秀江[5] Han Jin;Sun Wei;Bai Yunyun;Zhang Qian;Fan Xiujiang(State Key Laboratory of Continental Dynamics ,Xi'an710069,China;Department of Geology,Northwest University,Xi'an 710069,China;College of Petroleum Engineering and Environmental Engineering,Yan'an University,Yan'an Shaanxi 716000,China;College Chemistry and Chemical Engineering,Yulin University,Yulin Shaanxi 719000;Qilicun Oil Production Plant of Yanchang Oilfield,Yan'an Shaanxi 716000,China)

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系,西安710069 [3]延安大学石油工程与环境工程学院,陕西延安716000 [4]榆林学院化学与化工学院,陕西榆林719000 [5]延长油田股份有限公司七里村采油厂,陕西延安716000

出　　处：《地质科技情报》2018年第6期89-95,共7页Geological Science and Technology Information

基　　金：陕西省教育厅专项科研计划项目(15JK1812);延安大学自然科学专项基金项目(YDQ2013-23)

摘　　要：对鄂尔多斯盆地王盘山长6油层组低渗透储层的微观渗流特征及驱油效率影响因素进行了深入研究,室内模拟油田储层注水开发过程开展了真实砂岩微观模型水驱油渗流实验,结合薄片鉴定、物性分析、扫描电镜、恒速压汞等测试资料研究了储层微观水驱油特征,探讨了储层物性、微观孔隙结构、润湿性、驱替压力、注水倍数等参数与水驱油效率的关系。研究表明:王盘山区块长6储层微观渗流特征以均匀驱替、网状驱替为主,指状-网状驱替次之,少见指状驱替,在相同实验条件下不同驱替类型对应不同的驱油效率,均匀驱替类型驱油效率最高,平均值为63.08%,指状驱替类型驱油效率最低,平均值为27.72%;残余油80%以簇状、膜状形式存在,角隅状、孤立状分布较少;储层物性中渗透率的变化对驱油效率的影响较大,孔隙度次之;注水倍数增大,驱油效率亦增大,注水倍数增大至3PV时,驱油效率增大幅度减弱,趋于平缓、稳定;喉道半径<0.49μm时,驱油效率呈指数倍数趋势增加,喉道半径>0.49μm时,驱油效率呈线性倍数趋势增大。This paper studies the characteristics of microscopic water flooding and the influence factors of oil displacement efficiency,taking the Chang 6 reservoir of Yanchang Formation with a typical low and ultra-low permeability sandstone as an example.The study employed a real sandstone micro model to simulate the process of waterflooding in the laboratory,combining with the test data of thin section analysis, physical property analysis,EM analysis,and constant speed mercury pressure.The paper then discusses the relationship between the parameters of phYsical property,pore structure,wettability,displacement pressure,water flooding multiplier and water flooding efficiency.The results show that the microscopic percolation characteristics of the Chang 6 reservoir in the block of Wangpanshan area are dominated by homogeneous displacement and reticular displacement,followed by finger reticular displacement,with finger displacement as the last one.Under the same experimental conditions,different displacement types correspond to different oil displacement efficiency.The oil displacement efficiency of the type of homogeneous displacement is the highest,with the average value 63.08%,and the oil displacement efficiency of finger displacement type is the lowest,with the average value 27.72%.The study reveals that 80% of residual oil is in cluster and membranous form,corner shaped and isolated residual oil distribution is less. The change of permeability in the physical property of the reservoir has great influence on the oil displacement efficiency,and the porosity is the second.If the water flooding multiplier increases,the oil displacement efficiency increases.When the water injection ratio increases to 3PV,the increase of oil displacement efficiency decreases,and tends to be gentle and stable.When the throat radius is <0.49μm,the oil displacement efficiency tends to increase exponentially.When the radius of the throat is >0.49μm,the oil displacement efficiency tends to increase linearly.

关 键 词：姬塬油田 孔隙结构 渗流特征 水驱油实验 驱油效率 

分 类 号：TE122.23[石油与天然气工程—油气勘探]