裂缝性致密油藏水驱动态渗吸特征实验研究——以鄂尔多斯盆地富县地区长8储层为例  

Experimental Study on Dynamic Imbibition Characteristics of Fractured Tight Sandstone Reservoir during Water Flooding: an Example from Chang 8 Reservoir of Fuxian Area in Ordos Basin

作　　者：谷潇雨 王朝明[2] 蒲春生[1] 景成[3] 何延龙[3] 黄飞飞 Nasir Khan 陆雷超 GU Xiaoyu;WANG Chaoming;PU Chunsheng;JING Cheng;HE Yanlong;HUANG Feifei;NASIR Khan;LU Leichao(Faculty of Petroleum Engineering, China University of Petroleum （ East China） , Qingdao 266580, Shandong, China;Research Institute of Petroleum Engineering, Sinopec, Beijing 100101, China;College of Petroleum Engineering, Xi＇an Shiyou University, Xi＇an710065, Shaanxi, China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化石油工程技术研究院,北京100101 [3]西安石油大学石油工程学院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2018年第3期37-43,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金"低渗油藏低频振动辅助表面活性剂复合驱油机理研究"(51274229);国家自然科学基金"延时式可控高能气体压裂技术动力学机理研究"(51104173)

摘　　要：以鄂尔多斯盆地富县地区长8致密砂岩样品为研究对象,在岩心润湿性与孔隙微观结构剖析的基础上,研究了渗透率与水驱速度对裂缝性致密岩心样品动态渗吸采出程度的影响规律。实验结果表明:长8岩心属弱亲水砂岩,不同渗透率样品的孔隙尺寸分布范围(亚微米-微米级)属同一量级,峰值尺寸差异不大,但岩心渗透率越高,三维孔喉连通性越强;水驱速度相同时,受岩石孔隙连通性的影响,裂缝性岩心动态渗吸采出程度与基质渗透率正相关;水驱速度不同时,基质渗透率越高,裂缝系统内黏滞阻力越高,对应的最优水驱速度越高;对于裂缝性致密砂岩油藏而言,应选择合理的水驱速度,裂缝系统内水驱速度过快时,将抑制基质系统的逆向渗吸作用,从而大大降低动态渗吸采出程度,使得注入水无效、低效循环。Taking the Chang 8 tight sandstone reservoir in Fu County area of Ordos Basin as an example, the influenee of matrix permeability and water drive rate on the dynamie imbibition oil recovery degree of fractured tight sandstone cores was investigated based on the analysis of wettability and pore mierostrueture of the tight sandstone cores. The experimental result shows that： the Chang 8 cores from the study area are weak water wetting sandstone, the poresize of different permeability core samples varies in the range of sub-micron grade to micron grade, and there is little difference among pore size peak values of the cores. The higher the permeability of core is,the stronger the connectivity of three-dimensional pore throat. Under the condition of the same water drive speed,influenced by the connectivity of pore-throat, there is positive correlation between matrix permeability and dynamie imbibition recovery degree of fractured sandstone core. Under the condition of different water drive speed,influeneed by the viscosity resistance in the fracture system, the higher the permeability of core, the higher the optimal water drive speed. For fractured tight sandstone reservoir,it is important to select reasonable water drive speed. If the water drive speed in the fracture system is too great, the imbibition behavior of the matrix rock will be inhibited,which will cause the inefficient circle of injected water.

关 键 词：动态渗吸 长8致密储层 富县地区 鄂尔多斯盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程]