【摘 要】
：
In recent years,production from tight oil reservoirs has increasingly supplemented production from conventional oil resources.Oil-wet formations account for a considerable proportion of tight oil reser-voirs.Surfactant can change wettability and reduce in
【机 构】
：
School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,Ch
论文部分内容阅读
In recent years,production from tight oil reservoirs has increasingly supplemented production from conventional oil resources.Oil-wet formations account for a considerable proportion of tight oil reser-voirs.Surfactant can change wettability and reduce interfacial tension,thus resulting in a better oil re-covery.In this manuscript,a nonionic surfactant was introduced for tight oil-wet reservoirs.The oil recovery in the oil-wet sandstone due to spontaneous imbibition was 8.59％lower than that of the water-wet sandstone due to surfactant.The 0.1％surfactant solution corresponded to the highest imbibition recovery rate of 27.02％from the oil-wet sample.With the surfactant treatment,the treated core quickly changed from weakly oil-wet to weakly water-wet.The capillary force acted as the driving force and promoted imbibition.The optimal surfactant adsorption quantity in the oil-wet sandstone was observed in the sample at concentrations ranging from 0.1％to 0.3％,which also corresponded to the highest oil recovery.Analysis of the inverse Bond number NB-1 suggested that the driving force was gravity for brine imbibition in the oil-wet cores and that it was capillary force for surfactant imbibition in the oil-wet cores.When the surfactant concentration was lower than the critical micelle concentration,the sur-factant concentration was negatively correlated with the inverse Bond number and positively correlated with the oil recovery rate.When the surfactant concentration was higher than the critical micelle concentration,the oil recovery increased with a smaller interfacial tension.Nuclear magnetic resonance suggested that the movable pore and pore throat size in the oil-wet sample decreased from 0.363 μm in the untreated rock to 0.326 μm with the surfactant treatment,which indicated that the surfactant improved the flow capacity of the oil.The findings of this study can help to better understand the adsorption impact of surfactants on the characteristics of the oil/water and solid/liquid interfaces.The imbibition mechanism in oil-wet tight sandstone reservoirs was further revealed.These systematic approaches help to select appropriate surfactants for better recovery in oil-wet tight sandstone reservoirs through imbibition.
其他文献
为提高加油站油品计重密度取数代表性和计量准确性,研究通过加油站液位仪系统大数据计算油品计重密度,并用于加油站油品账务管理.以两种不同密度的油品及两种以上不同密度的油品相混合进行实验,理论研究和实验比对表明:该方法计算得到的加油站油品计重密度不仅取数代表性好、准确性高、时效性强,而且可减少加油站油品虚假损溢,降低计量风险,为一线员工减负,值得推广应用.
安全实训作为安全管理的重要一环,越来越受到企业以及各级政府的重视.中国提出以“智慧建设、智慧管理、智慧服务”为主要特征的“智慧型安全实训基地”概念,从感知层、网络层、应用层三方面,结合安全实训实际情况,对物联网关键技术在智慧型实训基地中的应用进行了探索.在此基础上,完成了智慧型实训基地典型功能设计,并对物联网技术在安全实训领域应用与发展中存在的不足进行了分析与展望.
对于某石化乙烯装置裂解气压缩机机组运行以来,多支转速探头相继出现故障的问题,在无法开盖检查处理故障的情况下,将零转速和键相位信号作为控制信号,用可调频率信号发生器模拟转速探头频率信号,并输入给超速保护器,保证了生产正常运行.后续通过优化转速探头安装方式,运行效果良好.现场应用表明:对转速探头故障的应急处理及改进安装方式具有较好的推广意义.
The mechanisms of lacustrine organic-rich shale formation have attracted attention due to its association with global shale oil and shale gas exploration.Samples of general-quality and excellent-quality source rocks,and oil shale from the Beibu Gulf Basin
A gold tube simulation device was used to study the cleavage of representative compounds into gas.The goal of this study is to investigate hydrogen isotope composition change of gaseous hydrocarbons during maturity.Gas chromatography and isotopic analyses
某天然气净化厂半贫砜胺液泵采用蒸汽透平驱动,在运行过程中针对多次出现的汽封泄漏、失速联锁和振动联锁等故障问题,通过拆卸机泵,检查机械、仪表等零部件,分析事故原因并制定了检修措施和调试方案,消除了电机驱动泵单台设备运行存在的停产风险,使得蒸汽透平驱动能够长周期平稳运行、降低了能耗,经济效益提升显著.
Biodegradation usually obscures or even radically alters the original characteristics of oil biomarkers.The mixing of oil from multiple sources makes each source difficult to trace.Identifying the source of bio-degraded oil from multiple sources has alway
Frequency-dependent amplitude versus offset(FAVO)inversion is a popular method to estimate the frequency-dependent elastic parameters by using amplitude and frequency information of pre-stack seismic data to guide fluid identification.Current frequency-de
The sedimentary facies/microfacies,which can be correlated with well logs,determine reservoir quality and hydrocarbon productivity in carbonate rocks.The identification and evaluation of sedimentary facies/microfacies using well logs are very important in
Fluid and effective fracture identification in reservoirs is a crucial part of reservoir prediction.The frequency-dependent AVO inversion algorithms have proven to be effective for identifying fluid through its dispersion property.However,the conventional