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论文类型：期刊论文

发表时间：2018-04-01

发表刊物：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

收录刊物：SCIE、EI

卷号：119

页面范围：678-687

ISSN号：0017-9310

关键字：CO2 geological storage; Capillary pressure; Sandstone cores; Relative permeability; Irreducible saturation; Magnetic resonance imaging

摘要：Capillary pressure is an important parameter to characterize the core properties in CO2 geological storage applications, and it is necessary to study the CO2 drainage behavior to predict the potential and ensure the safety of storage. In this work, we conducted CO2 drainage experiments in two types of sandstone cores (Berea sandstone and synthetic sandstone) under reservoir conditions (800 m underground) and measured the capillary pressure using an MRI system. The drainage experiments were repeated in a capillary number range from 5.22 x 10(-9) to 5.5 x 10(-7) by varying the injection rate. The entry pressure and pore size distribution index were calculated by fitting a straight line on a log-log curve of the effective saturation versus capillary pressure. Relative permeability curves were plotted using the calculated entry pressure and pore size distribution index. The curves were consistent with the properties of the sandstone cores. The capillary desaturation curves gave the irreducible brine saturations for different permeability, wettability, injection pressure and injection direction conditions as a function of capillary number. (C) 2017 Elsevier Ltd. All rights reserved.