Source: energy.gov, March 28
The U.S. Department of Energy (DOE) announced up to $7 million toward the research and development (R&D) of innovative subsurface geothermal technologies. DOE’s Geothermal Technologies Office (GTO) will fund projects that will focus on improving geothermal drilling efficiency and cost reduction by addressing two of the most significant barriers: state of stress and lost circulation events.
The subsurface state of stress dictates fracture networks that provide the required permeability for a geothermal reservoir, so an increased understanding of the stress state is valuable for siting wells during geothermal energy development. Lost circulation events (LCEs) can occur during drilling when fluids pumped from the rig through downhole drilling equipment are “lost” and flow into geological formations instead of returning to the surface to complete a circulation path. Researching and developing innovative technologies that tackle state of stress and LCEs issues will reduce geothermal exploration and drilling costs, making geothermal a more viable and accessible energy source.
Currently, the United States is the world leader in installed geothermal capacity with more than 3.8 gigawatts online. One key to unlocking domestic geothermal potential is to reduce the cost of drilling operations, which can account for up to 50% of geothermal exploration and development costs.