Reactive Transport Modelling of Injection Fluid- Reservoir Rock Interaction

Abstract

One-dimensional radial reactive transport TOUGHREACT models have been created for three injection wells as part of the injection management strategy in an operating geothermal field. This provides an understanding of the injection fluid-reservoir rock interaction which shapes the behavior and characteristics of the injection wells. Three main factors that contribute to the injection well behavior are identified including feedzone thickness, injection flow rate and variations, and fracture porosity-permeability relationship of the geologic media injected into.
This paper also discusses the potential opportunities in injection management such as injection configuration, brine-condensate switching and new well acidising. It demonstrates the use of geochemical modelling as a tool to assist in optimizing the injection strategy for reservoir management.