摘要
自发渗吸对致密砂岩油藏的注水开发有着重要意义,理想情况下自发渗吸驱油效率可以达到50%以上,目前国内外学者对致密储层自发静态渗吸研究不够系统和深入,实验模型不能真实和全面地反映储层物性及流体对自发渗吸的影响规律。针对以上问题,设计制作了典型区块致密储层天然岩芯和人造岩芯,开展了致密储层多因素自发静态渗吸实验,系统研究了渗吸时间、岩芯长度、岩芯孔隙度、地层水矿化度、岩芯渗透率、初始含水饱和度、界面张力及润湿性对致密储层渗吸驱油效率和渗吸速度的影响程度,定量评价了不同因素下渗吸驱油效果的变化规律。结果表明,影响渗吸驱油的主要因素为润湿性、孔隙度、渗透率、界面张力,初始含水饱和度次之,岩芯长度及地层水矿化度对渗吸驱油效率的影响最弱,作用强度最小,研究结果对致密储层有效注水开发提供了实验和理论依据。
Spontaneous imbibition is of great significance for the water injection development of tight sandstone reservoirs.Ideally,the oil displacement efficiency of spontaneous imbibition can reach over 50%.Currently,domestic and foreign scholars have not conducted systematic and in-depth research on the spontaneous static imbibition of tight reservoirs,and experimental models cannot truly and comprehensively reflect the influence of reservoir properties and fluids on spontaneous imbibition.In response to the above issues,natural and artificial cores of typical block tight reservoirs were designed and manufactured,and multi factor spontaneous static infiltration experiments were conducted on tight reservoirs.The effects of infiltration time,core length,core porosity,formation water mineralization degree,core permeability,initial water saturation,interfacial tension,and wettability on the efficiency and speed of infiltration and displacement of tight reservoirs were systematically studied,quantitative evaluation was conducted on the variation patterns of oil displacement effects by infiltration under different factors.The results indicate that the main factors affecting oil displacement by infiltration are wettability,porosity,permeability,and interfacial tension,followed by initial water saturation.The influence of core length and formation water salinity on oil displacement efficiency by infiltration is the weakest,with the least intensity.The research results provide experimental and theoretical basis for effective water injection development in tight reservoirs.
作者
石立华
薛颖
崔鹏兴
汪桐羽
侯玢池
SHI Li-hua;XUE Ying;CUI Peng-xing;WANG Tong-yu;HOU Bin-chi(Research Institute of Yanchang Petroleum(Group)Co.,Ltd.,Xi'an 710065,China;Shanxi Research Center for Exploration and Development Engineering Technology of Extra Low Permeability Oil and Gas,Xi'an 710065,China;Xi'an Sitan Instrument Co.,Ltd.,Xi'an 710065,China;Laojunmiao Oil Production Plant,PetroChina Yumen Oilfield Company,Jiuquan 735000,China)
出处
《科学技术与工程》
北大核心
2023年第29期12494-12503,共10页
Science Technology and Engineering
基金
陕西省自然科学基础研究计划(2023-JC-YB-423,2022JQ-290)。
关键词
致密油藏
自发渗吸
渗吸驱油效率
渗吸驱油速度
主控因素
tight reservoir
spontaneous imbibition
imbibition displacement efficiency
imbibition displacement velocity
dominant factors
