Petrocedeño is a Venezuelan joint venture (JV) between PDVSA, Total, and Statoil. Petrocedeño operates in the San Diego field of the Junín block located in the Orinoco Belt, where over 500 lifted wells currently produce over 120,000 bpd of extra-heavy oil (7-9.5 API) using progressive cavity pumps (PCPs). Petrocedeño has extensively used down-hole sensors to monitor PCP operational parameters, such as velocity, torque, vibration, intake and discharge pressure, and temperature. Timely and proper usage of this data, incorporated with other well information and operational data, improves production optimization using proactive surveillance and diagnostics of underperforming wells. In spite of having process data in hand, it was noticed that additional optimization can be obtained by integrating the data available with articulated workflows.
Initially, a pilot was conducted to evaluate technology aimed at optimizing the production of 50 wells through timely identification of underperformance occurrences. This was achieved using:
Automated data gathering and integration
Automated daily production rate estimation using operational data and artificial neural networks (ANNs)
Customized surveillance and diagnostic workflows
The technology applied was developed by integrating data and estimating well production rates on an hourly basis. This involved using trained ANNs and a leading production technology platform. In addition, continuous surveillance workflows of operational parameters as well as estimated rates and other production information were implemented on engineers' computers through customized well and reservoir analysis software created during the pilot.
After the pilot project, Petrocedeño engineers were able to reduce the time to identify underperforming wells in 20%. The positive results achieved in the mentioned pilot, encouraged the company to implement the system in the whole San Diego field, as well as introducing additional production surveillance and optimization workflows and visualization tools. This paper presents some of the main workflows implemented and the results obtained.