Analytical estimation of pressure response to multiple well CO2 storage by corrected superposition of single well injection models
SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA (UPC-CSIC)
A cargo de: Silvia de Simone (Imperial College London)
Dia: Jueves 28 de Febrero
Hora: a las 12:15 h
Lugar: Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja
Carbon Capture and Storage (CCS) is a promising technology for the cost effective transition to low carbon energy systems. A global injection of the order of 10 Gt CO2 per year must be stored for meeting the target of less than 2 degrees of global warming by 2050. This requires the injection of CO2 into deep saline aquifer through multiple sites. The adoption of simplified analytical solutions greatly helps in the preliminary evaluation of the site storage capacity and injectivity, which can be included in energy system models to identify potential bottlenecks to CCS deployment. While pioneering efforts have been devoted to analytically estimate the reservoir pressurisation in response to the injection of CO2 into a single well, the solution of the multi-site injection scenario is typically performed by simple superposition, which is theoretically invalid for multi-phase systems. We quantify the error associated to the application of superposition to multiple CO2 injection well scenarios in a rectangular grid geometry. We show that the application of superposition overestimates the pressure build-up because it neglects the presence of multiple CO2 plumes that increases the total fluid mobility in the reservoir. The adoption of a dimensionless time scaled to the geometric average between the advective and the diffusive characteristic times allows us to define a general model for the error which can be used to correct the pressure estimated by superposition. This procedure can be applied to any analytical solution and represent an extension of the analytical simplified models to scenarios of multiple injections sites.