Abstract
Abstract Advanced laboratory system of rock permeability test associated with constant flow pump, and constant head permeability techniques were developed to measure permeability and specific storage of rock for supercritical CO2. The laboratory system was designed to be capable in reproducing similar physical condition of deep aquifer within high pressure and high temperature where CO2 tends to be in supercritical state. To analyze the result of permeability tests, mathematical models of constant flow pump and constant head permeability techniques were modified to deal with two-phase flow drainage displacement of CO2-water in rock. For the examination of its applicability, experimental tests and numerical analysis were undertaken. The accuracy of the obtained specific storage was validated by employing a ratio of the specific storage of the rock specimen to the storage capacity of the pump used in the permeability test. It was found that the specific storage of low permeability sandstone for storing supercritical CO2 is 1.63 × 10−4 1/Pa, while large permeability sandstone has the specific storage for supercritical CO2 at 1.12 × 10−7 1/Pa. This finding suggested that advanced experimental system of constant flow pump and constant head permeability technique can be used as repeatable, accurate and standardized laboratory test in measuring specific storage of sedimentary rock for CO2 in supercritical state.
Highlights
It has been widely believed that, over the past several 100 years, CO2 emission into the atmosphere has increased steadily and become a major contributing factor to global warming [6]
Advanced laboratory system of rock permeability test associated with constant flow pump, and constant head permeability techniques were developed to measure permeability and specific storage of rock for supercritical CO2
It was found that relative permeability curves of Ainoura sandstone obtained using constant flow pump permeability technique is consistently similar with the relative permeability curve obtained using constant head permeability techniques
Summary
It has been widely believed that, over the past several 100 years, CO2 emission into the atmosphere has increased steadily and become a major contributing factor to global warming [6]. Multi approaches are urgently needed to reduce CO2 emission to atmosphere They include efficient production and use of energy; exploration of non-fossil fuel energies such as solar power, wind energy, biomass; and development of technologies of disposing CO2 emission such as CO2 ocean storage, CO2 mineral carbonation, and carbon capture and geological storage (CCGS) [8]. The latter, CCGS, is considered the most promising option to reduce atmospheric CO2 emission among due to large storage capacity expected to deal with the increasing anthropogenic CO2 emissions, 29 Page 2 of 14
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