Injection Test Evaluation for New Injector Candidates in Darajat Field as Part of Darajat Injection Management

Abstract

Injecting condensate back into the reservoir plays an important role in maintaining sustainability of the geothermal resource. The injection process provides pressure support and recharge to the reservoir. However, injecting condensate back into the reservoir requires optimization of the amount of condensate injected to minimize interference between the injection and production wells. Excessive injection would cause reservoir cooling that results to condensation of the steam reservoir. Strong interference between the injection and production well would also cause rapid condensate breakthrough that may reduce steam production or even kill the production well. This paper describes the evaluation of back-up injector candidates DRJ-05A, DRJ-12 and DRJ-24 by conducting injection tests in 2011. Although (less than a month each), nevertheless these injection tests have provided important data regarding injection impact using a multi-disciplinary set of data. For future injection tests, it is highly recommended that the tests be performed for a minimum of three (3) months. This test duration is currently perceived to be sufficient to observe the movement and impact of the condensate to surrounding wells.