Publications

The development of a deepwater gas condensate field in Indonesia possesses high risk due to some subsurface uncertainties in the absent of Drill Stem Test (DST) and core measurement data from exploration and appraisal wells. Reservoir Surveillance, Analysis, and Optimization (SA&O) plan was developed to reduce the uncertainty from gathering new data and analysis. One of the key tasks in SA&O plan is conducting well transient test analysis which could be accomplished when the field production began in mid of August 2016. This paper provides systematic explanation from the application of integrated Pressure Transient Analysis (PTA) and Rate Transient Analysis (RTA) workflow in 15-month production period of two deepwater gas condensate wells. The workflow is enabled by the availability of real time and high frequency data from each well, in form of Bottom Hole Pressure (BHP) and rates. Both analytical and numerical model were used during analysis. PTA results provide useful insights to refine previous reservoir characterization in some critical areas such as: transmissibility (kh), well deliverability, mechanical and rate-dependent skin, composite behavior, and reservoir boundary. Moreover, history matching from numerical model with RTA can provide reliable estimate of drainage radius and Hydrocarbon In-Place (HCIP).