Enhancing the Sustainability of EGS Using Colloidal Silica Gel

Abstract

We carried out modeling studies to demonstrate how the silica agent can be used and show how we anticipate the silica blocking and diverting agent will perform on a simple thermal test within a single fracture. The modeling code enables us to calculate the drawdown and flow rates for desired scenarios for comparison to those without the silica blocking agent. We illustrate gel deployment in a single fracture for enhancing heat extraction and minimizing water uses. We have begun simulating silica gel in a three dimensional fracture network. Logistics for a parametric study for optimal use of silica gel are discussed. We conclude by a short discussion on gel deployment under conditions of uncertainty in the EGS subsurface characterization.