The Comparison of Boron Cycling and Tracer Test Result at Darajat Geothermal Field and Its Usefulness for Production and Injection Management

Abstract

Long-term sustainability of a vapor-dominated geothermal resource is largely determined by the injection of fluids back into the reservoir. Properly managed, injection generates “new steam” as the water boils when it comes into contact with hot dry rock in the reservoir. Without injection the field would dry out and production would go into decline. For the development of a long term injection strategy, two studies have been performed, a 2008 tracer test and a review of boron cycling, which aims to understand the connection between injection and production wells. This paper compares the boron cycling process and tracer migration at Darajat Field. Cycling of boron in liquid condensateinjectate is then fractionated as boron in the steam phase between the DRJ-03 injector and surrounding production wells. Recovery of volatile tracers injected into the DRJ-03 injector is compared. In general, production wells with high boron content in steam have tracer recovered from the same injection well. 1. Introduction Darajat is the largest producing vapor dominated geothermal