Cold Water Invasion in Producing Liquid Dominated Geothermal Reservoirs

Abstract

Pressure reduction at depth as a result of fluid withdrawal has rtsulted in cold water invasion in several liquid dominated geothermal reservoks. Cooi waters enter the hot rtservoir by the same paths via which surface springs w a t fed before exploitation, and cooling is first observed in wells near such features. In and area. Understanding the coofig processes can about the nscrvoir s a w and performance. Such ' cold water invasion appears now to be expectcd in most liauid dominated TtsQyoiTs, although this nsponse may some nservok the affected 81tas ale rtstricted in depth providethenservoirmgineerwithwrminformatiion be-difficult to separate from rtinjech effecis.