Publications

In the advancing of the oil and gas data utilization technology, there are a lot of hidden potential that will be unlocked once one realized on how to interpret and implement a data utilization engine as a representation of the process . The benefits carried from it varies depending on how critical and how frequent the process occurs in the business. In Swadaya Operation, one of the most frequent and important processes is Surveillance. Surveillance, varies depending on which parameter needed to be evaluated. The well test that is conducted in the surface, is one of the most important data needed by an engineer in order to conduct well performance review, identifying further opportunities and extend to validate reserve calculation. The physical well test that normally conducted by portable test unit indeed provides a validating information, however, in the brown field with lots of well count, the portable unit mobilization and capacity becomes a constraint that limits the frequency of the well to get the new test. The frequency differs from one test every 15 days until one test every 30 days, depend on the well production. As one of the solutions to improve the well test frequency, together with the emerging simulation technology, a Virtual Well Test system is introduced in Swadaya field. Virtual Well Test is a simulated information that based on well model, surface model and downstream model that reflect every change in the operation parameter into the information of the well production. The well model uses both static information such as interpreted bottom hole pressure from fluid level, pump information and dynamic information such as ampere data, tubing pressure. The surface network model uses Piping and Instrument Diagram (P&ID), elevation information and piping profile while the Downstream model uses the Gathering Station P&ID information with the dynamic information from oil, water and gas totalizer. From the simulation, using high density data information such as totalizer and ampere that is transmitted through Supervisory Control and Data Acquisition (SCADA) system, the virtual information on the mass flow rate is calculated. Based on pilot implementation in the Swadaya field for about 8 months, virtual well test has a solid accuracy trend comparing to physical well test of about 84%. With this result, there are several opportunities ahead such as data utilization to predict pump failure, offline simulation for optimization plan, and even further on the optimization of the physical well test count with changing in paradigm as it will become a validator.