(ASSESSING THE IMPACT OF CONVECTIVE-DIFFUSION MIXING ON FORECASTING OF THE COMPOSITIONAL BREAKDOWN OF CARBON DIOXIDE AND NITROGEN IN THE MIXTURE WITH DUE ACCOUNT FOR PHYSICAL SIMULATION DATA)
One of the priority issues to be solved in underground gas storage is the partial replacement of the buffer volume of natural gas with a mixture of non-hydrocarbon gases, the main component of which is CO2. Implementation of this technology on industrial scale calls for reliable forecasting of the СО2 – CH4 mixing zone so that to prevent carbon dioxide breakthrough to the operating well stock.
This article describes the simulation of convective-diffusion mixing of natural gas, carbon dioxide, and nitrogen aimed at improvement of reliability of forecast calculations of compositional breakdown in the formed mixing zone. The gas mixture compositional breakdown was analyzed in the course of experimental studies of core samples at the reservoir model outlet.
Based on the obtained data, the convective diffusion ratios of non-hydrocarbon components were calculated by the finitedifference method. In the course of a phased study, the sensitivity level of the mixing zone response to the convective diffusion ratio was measured. Following the physical simulation, it was possible to obtain convective diffusion ratios specific to carbon dioxide and nitrogen.
S.A. Khan, PhD in Engineering, PJSC Gazprom (Saint Petersburg, Russia), S.Khan@adm.gazprom.ru
V.G. Dorokhin, PhD in Engineering, Gazprom VNIIGAZ LLC (Saint Petersburg, Russia), V_Dorokhin@vniigaz.gazprom.ru
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