Role of Fluid Pressure in the Production Behavior of EnhancedGeothermal Systems with CO2 as Working Fluid

Pruess, Karsten

Lawrence Berkeley National Laboratory

关键词: Heat Transfer;    54;    Simulation;    Working Fluids;    Production;   

DOI  :  10.2172/928785
RP-ID  :  LBNL--62611
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  928785

美国|英语

来源: UNT Digital Library

【 摘 要 】

Numerical simulation is used to evaluate mass flow and heatextraction rates from enhanced geothermal injection-production systemsthat are operated using either CO2 or water as heat transmission fluid.For a model system patterned after the European hot dry rock experimentat Soultz, we find significantly greater heat extraction rates for CO2 ascompared to water. The strong dependence of CO2 mobility (=density/viscosity) upon temperature and pressure may lead to unusualproduction behavior, where heat extraction rates can actually increasefor a time, even as the reservoir is subject to thermaldepletion.