Assessment For Utilization of Geothermal Co-Produced From Oil Gas Fields

Geothermal energy is a vast yet not fully utilized renewable resource. EGS Enhanced geothermal system (EGS), as a viable and sustainable heat extraction power generation technique, was encouraged in many countries. However, it is not economically attractive due to its high costs. With repetitive use of wells and infrastructure, harnessing geothermal energy from existing oil gas wells cuts costs and is more economically feasible and it can promote the use of geothermal energy. Oil wells are mostly drilled at depth from 2000m to 5000m, with mid/low-temperature geothermal resources, yet high exploitable geothermal potential to be exploited. In this study, we reviewed the current status and technologies that have been applied in oil gas fields for geothermal utilization. From case histories, we studies important aspects in successful co-production of geothermal power production and oil&gas production; adaptation of non-economic well to produce water for power generation. Apart from mid-temperature power generation, we also examined the synergy potential for geothermal energy exploitation, such as geothermal-enhanced heavy oil production. The extra oil produced by utilizing geothermal energy make geothermal business more profitable. This study validated and reveals the potential for the exploitation of low-temperature geothermal resources on oil and gas sites.