Numerical modeling of water injection into vapor-dominatedgeothermal reservoirs

Pruess, Karsten

Lawrence Berkeley National Laboratory

关键词: Corrosion;    Heat Transfer;    Thermodynamics;    Flow Rate;    54;   

DOI  :  10.2172/932475
RP-ID  :  LBNL--61917
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  932475

美国|英语

来源: UNT Digital Library

【 摘 要 】

Water injection has been recognized as a powerful techniquefor enhancing energy recovery from vapor-dominated geothermal systemssuch as The Geysers. In addition to increasing reservoir pressures,production well flow rates, and long-term sustainability of steamproduction, injection has also been shown to reduce concentrations ofnon-condensible gases (NCGs) in produced steam. The latter effectimproves energy conversion efficiency and reduces corrosion problems inwellbores and surface lines.This report reviews thermodynamic andhydrogeologic conditions and mechanisms that play an important role inreservoir response to water injection. An existing general-purposereservoir simulator has been enhanced to allow modeling of injectioneffects in heterogeneous fractured reservoirs in three dimensions,including effects of non-condensible gases of different solubility.Illustrative applications demonstrate fluid flow and heat transfermechanisms that are considered crucial for developing approaches to insitu abatement of NCGs.