Lesson Learn of Workover Mechanical Program in an Injection Well at Dieng’s Geothermal Field

Abstract

Deposits of silica scales cause a lot of problems during exploitation stage in some geothermal fields around the world. Silica scales deposition occurs in wellbore and along the pipe networks, that cause the reduction of productivity and injectivity of production and injection wells. Based on the history, silica scales often occur in injection wells. Silica deposition in the wellbore can be removed by chemical and or mechanical treatments. Reduction of injectivity of this injection well can be used as the first indication of silica scale deposition in the wellbore. To get some information about the condition of the well, a well investigation should be done before mechanical cleaning program is performed. This paper covers complete process of workover job with mechanical treatment including the work design, execution and post activities with some lesson learn and recommendation.