Production Test Analysis of XYZ-Well at Dieng Geothermal Field Using Horizontal Discharge Lip Pressure Method with Russell James Equation and Hiriart Equation

Abstract

Production test is one of very crucial activities in the geothermal field development process because the condition of the well, reservoir characteristics, and production capacity of the well can be determined by the test. Production test data should be processed carefully to get the best possible determination of production capacity approaching the actual condition of the well, so that future development plans of production wells may be optimized and monitored. Errors in production test data processing would decrease the production efficiency of the wells based on the production wells development design that have been made. In the other hand, the production can be analyzed each time based on available baseline condition prior to mitigate the problems. This paper describes the production analysis results based on case studies of XYZ-well production test at Dieng geothermal field that uses the Horizontal Lip Pressure Method with two silencers and two different types of weir boxes simultaneuosly at the same time of production test. Data processing is accompanied by data selection process, lip pressure correction, and correction of the gas presence. Total rate and total enthalpy of the fluid, which become the objectives of this production test, will be determined by Russel James equation and Hiriart equation. The results from both equations are also compared to know the sensitivity of each equation toward the available production test data. All results will be presented in graphs, so that reservoir characteristics and XYZ-well condition can be specified based on those graphs.