Heat Extraction Processes Using Unconventional Geothermal Technologies (GreenLoop) Applied in Different Reservoir Types

Abstract

GreenFire Energy has been heavily involved in developing unconventional heat extraction technologies from different resource types which include both geothermal and oil and gas resources. Over recent years with significant advancements in various technologies, GreenFire has been engaged to model its technology and/or implement its GreenLoop technology in various geothermal resources across the world. While these initiatives usually commence with proof of concept retrofit projects, the established strategy involves widespread implementation of the GreenLoop technology wherever feasible from a techno-economic perspective within the reservoir. In order to meet the set techno-economic goals it is essential to diagnose wells and understand reservoir characteristics. It is commonly acknowledged that resources can be grouped into four categories: steam, two-phase, liquid, and impermeable reservoirs, all based on properties such as enthalpy and permeability. In addition, geothermal wells can also be classified as low, medium, and high enthalpy systems. Unconventional technology architecture and operating conditions can then be simulated by analyzing key parameters such as reservoir pressure, feedzone transmissivity, inflow characteristics, etc. to ensure optimal heat extraction in each case. This paper describes the resource and GreenLoop technology characteristics that are most appropriate for commercial-scale heat extraction.