Title : Unlocking GHG reduction potential and enhanced oil recovery with direct contact steam generation technology: A case study in Lloydminster, Canada
Abstract:
General Energy Recovery Inc. (GERI) has developed a commercial-ready DCSG system which results in significant greenhouse gas (GHG) reduction and, at the same time, increasing ultimate reservoir heavy oil recovery. By combining steam and flue gas into a single injection stream, DCSG enables superior energy efficiency and reservoir performance compared to conventional Once-Through Steam Generators (OTSGs), addressing critical challenges in thermal EOR. The presented case study focuses on a single-well pilot conducted in a sub-optimal heavy oil reservoir in the Lloydminster area, Canada. The target reservoir was less than 15 metres in thickness - well below the 25+ metres typically required for conventional steam-only recovery methods. Despite these challenging conditions, the pilot achieved a Steam-to-Oil Ratio (SOR) of 1.6, significantly lower than industry averages, while delivering enhanced oil recovery and demonstrating storage of the CO2 generated.
Key findings include:
- GHG Retention: 55% of the CO2 generated during the steam generation process was permanently retained in the reservoir, avoiding venting to the atmosphere.
- Thermal Efficiency: Simultaneous injection of steam and flue gases enhanced thermal energy utilization, reducing energy input while achieving greater reservoir productivity.
- Improved Reservoir Access: The combined approach effectively mobilized heavy oil in thinner pay zones that would be uneconomical with conventional OTSG technology.
These results underscore the transformative potential of GERI’s DCSG technology for heavy oil recovery globally. By maximizing resource extraction efficiency and enabling permanent CO2 reservoir retention, this approach offers an innovative solution to the pressing dual challenges of reducing GHG emissions and meeting energy demand. This paper will explore the detailed technical performance, operational insights, and environmental implications of the Lloydminster pilot, positioning DCSG as a game-changer for sustainable heavy oil recovery.
