致密储层岩心静态渗吸规律研究  

Study on static imbibition law of tight reservoir core

作　　者：马超[1,2,3] 任文东 岳泉 刘炜 黄晓依 MA Chao;REN Wendong;YUE Quan;LIU Wei;HUANG Xiaoyi(School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Hubei Province(Yangtze University),Wuhan 430100,Hubei;National Engineering Research Center for Oil&Gas Drilling and Completion Technology,Wuhan 430100,Hubei;Research Institute of Petroleum Engineering,Jianghan Oilfield Company,SINOPEC,Wuhan 430035,Hubei)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室(长江大学),湖北武汉430100 [3]油气钻完井技术国家工程研究中心,湖北武汉430100 [4]中石化江汉油田分公司石油工程技术研究院,湖北武汉430035

出　　处：《长江大学学报（自然科学版）》2023年第3期94-100,127,共8页Journal of Yangtze University(Natural Science Edition)

基　　金：油气藏地质及开发工程国家重点实验室开放基金项目“可热/盐诱导增稠的温敏聚合物与高碳链甜菜碱两性表面活性剂在高温高盐环境下的相互作用研究”(PLN201907)。

摘　　要：渗吸采油是鄂尔多斯盆地延长组致密油藏高效开发的重要手段,为了明确延长组致密油藏的渗吸驱油规律,选取长7组岩心进行静态渗吸规律的研究。首先对静态渗吸过程进行分析;然后采用核磁共振分析法进行岩心孔喉分布测试,研究在不同渗透率下孔喉分布对渗吸采收率的影响;最后进行岩心润湿性及渗吸液界面张力对采收率的影响分析。研究结果表明,静态渗吸过程可以划分为发生阶段、增长阶段和稳定阶段;致密砂岩岩心孔喉分布在0.001~0.1μm和0.1~10μm范围内;随着渗透率的增加,采收率呈现上升趋势,渗吸达到平衡的时间也不断减小,但是在渗透率接近的情况下,小孔喉数量的增加会导致采收率的略微下降;岩心表面的亲水性越强(中间润湿亲水强亲水),渗吸采收率越高;随着渗吸液界面张力的降低,采收率先增加后减小,且岩心在含有驱油剂的渗吸液中的采收率明显高于清水。Imbibition oil recovery is an important means for the efficient development of tight reservoirs of Yanchang Formation in Ordos Basin.In order to clarify the law of imbibition and displacement of tight reservoirs of Yanchang Formation,the core of Chang 7 Formation was selected to study the static imbibition law.Firstly,the static imbibition process was analyzed,and then the core pore throat distribution was tested by nuclear magnetic resonance analysis to study the effect of pore throat distribution on imbibition recovery under different permeability.Finally,the effects of core wettability and interfacial tension of imbibition on oil recovery were analyzed.The results show that the static imbibition process can be divided into occurrence stage,growth stage and stabilization stage,and the core pore throat of tight sandstones is distributed in the range of 0.001~0.1μm and 0.1~10μm.With the increase of permeability,the oil recovery shows an upward trend,and the time for imbibition to reach equilibrium decreases continuously,but when the permeability is close,the increase in the number of small pore throats will lead to a slight decrease in oil recovery.The stronger the hydrophilicity of the core surface(intermediate wetting-hydrophilicity-strong hydrophilicity)is,the higher the imbibition recovery is.With the decrease of interfacial tension of the imbibition solution,the recovery rate increases first and then decreases,and the core recovery in the imbibition solution containing oil displacement agent is obviously higher than that of clear water.

关 键 词：静态渗吸 致密储层 采收率 鄂尔多斯盆地 

分 类 号：TE327[石油与天然气工程—油气田开发工程]