Temperatures above 100C at depths around 3 km have been observed in many oil and gas fields around the world.Wells with such temperature profiles can be used for production of geothermal energy, during and after oil and gas production.This green energy has many applications including power generation, heating, cooling, and water desalination.The economical value of these wells has been assessed for different applications.While in operating wells, the geothermal energy is freely carried to the surface and can be extracted at the fluid processing point, in non-operating wells, the cost of bringing the energy to the surface is considered in the economical evaluation of the resource.As examples, several deep wells in Qatar with BTH above 100C have been studied and evaluated for geothermal energy production.It is shown that the extracted green energy can be used for power generation, cooling and water desalination as a stand-alone resource or as a complementary resource when hybridized with flare gas.The extracted energy can add significantly to the economical value of the wells, while helping the oil and gas production industry with improving its environmental and sustainability profile.