Development of low-permeability geothermal reservoirs

The development of low-permeability geothermal reservoirs aims at basinal type structures that are saturated with brines of high salinity and variable contents of dissolved gas. Low-enthalpy fluids from these reservoirs have to be produced at high rates to be able to generate electricity using adapted binary cycle power plants. Therefore the natural productivity of the wells has to be enhanced by applying appropriate stimulation treatments in order to reach a reasonable inflow at moderate depressions. Nevertheless, due to the non-artesic nature of the reservoirs the fluids are produced using an artificial lifting technology. The focus of these investigations is put on the underground system, aiming at the determination Of critical reservoir and production aspects seeking the technologic and economic limits Of the overall engineering concept. All aspects of the individual development have to be properly examined and applications designed that a final technologic strategy delivers a positive net energy output and is transferable to similar locations bringing geothermal energy production closer to the customer.