Simulating Long Term Reactive Transport of CO2 in Saline Aquifers with Improved Code RetrasoCodeBright
نویسندگان
چکیده
ABSTRACT: The geological storage of CO2 in saline aquifers is believed to be one of the most promising ways to reduce the concentration of the greenhouse gas in the atmosphere. Injection of CO2 will, however, lead to dissolution of minerals in regions of lowered pH and precipitation of minerals from transported ions in regions of higher pH. The geomechanical implications of these changes on the stability of the reservoir are of crucial importance in the evaluation of potential injection reservoirs. In cold aquifers the formation of CO2 hydrate will affect flow paths and may also have implications on the geomechanical stability due to the increase in volume of the formed hydrate. This paper presents a new application of improved code RCB (RetrasoCodeBright) to simulate CO2 storage in saline aquifer. According to specification of carbon dioxide under injecting, gas density and gas solubility have been corrected in code RCB. Newton-Raphson method used to solve the flow and mechanics in RCB has been improved so as to make the solutions always converge even under high gas injecting pressures. A 2D hydro-chemical-mechanical problem is solved by the original and the improved RCB code. The results are presented and compared. Strategies for the use of the simulator for hydrate exploitation purposes, are also discussed
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