An ideal analogue for heavy oil fields is the Bati-Raman Field in Turkey which contains heavy (10-15 °API), undersaturated and highly viscous oil. Due to the additional challenges posed by a low GOR and inactive aquifer, primary recovery factor was as low as 1.5%.
To counter these challenges, the operators used a combination of recovery techniques, including:
- Steam injection combined with horizontal producers in the crestal area containing high conductivity vertical fractures.
- Chemically augmented WAG to assist CO2 injection in areas where there is a poor response to CO2 injection alone.
- Continuation of CO2 injection in the eastern part of the field where a CO2 pilot study proved it viable. (Fig 1).
- Following the implementation of these techniques and their regular reassessment, recovery factor has now been increased to 10.5% to date.
The Digital Analogue Knowledge System (DAKS™) contains many global oil and gas analogues specifically focused on heavy oil fields. Use these analogues to benchmark your own field, and delve into C&C Reservoirs Reservoir Evaluation Reports to discover best practices from top performing reservoirs that can be applied to your own assets.