Experimental and Numerical Studies of Spontaneous Imbibition with Different Boundary Conditions: Case Studies of Middle Bakken and Berea Cores
Experimental and Numerical Studies of Spontaneous Imbibition with Different Boundary Conditions: Case Studies of Middle Bakken and Berea Cores
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DOI：
10.1021/acs.energyfuels.9b00909
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发表时间：
2019-05
期刊：
影响因子：
5.3
通讯作者：
Shaojie Zhang;H. Pu;J. Zhao
中科院分区：
文献类型：
--
作者：
Shaojie Zhang;H. Pu;J. Zhao
致密油和天然气正在成为北美日益重要的能源。自发渗吸是致密油气藏开采的一种重要机理。本文采用逆流自吸实验和核磁共振相结合的方法，研究了8个岩心样品的自吸和流体分布。核磁共振能够检测从微孔到裂缝的不同尺寸孔隙中的流体分布。在实验之前，Middle Bakken和Berea岩心被空气饱和。在此基础上，进行了单端开口（OEO）和两端封闭（TEC）两种边界条件下的自吸实验。通过选取合理的参数，使自发自吸模型的数值解与实验结果相吻合。通过拟合得到了毛管压力和相对渗透率。此外，还分析了重力对自吸的影响。结果表明，对于紧压型转子，重力可以忽略不计。
Tight oil and gas are becoming increasingly important energy sources in North America. Spontaneous imbibition is an important mechanism in oil and gas recovery from tight reservoirs. In this study, countercurrent spontaneous imbibition experiments and nuclear magnetic resonance (NMR) were combined to study the imbibition and the fluid distribution in eight core samples. NMR is able to detect fluid distribution in different sizes of pores ranging from micropores to fractures. Before the experiments, Middle Bakken and Berea cores were saturated with air. Then imbibition experiments with one end open (OEO) and two ends closed (TEC) boundary conditions were carried out. The numerical solutions of spontaneous imbibition models were matched with experimental results by choosing reasonable parameters. The capillary pressure and relative permeability were obtained from the matching. Moreover, the gravity effect on the spontaneous imbibition was analyzed. It was found that the gravity can be neglected for tight ro...