China's Offshore Multi-layer Heavy Oil Thermal Recovery Field Hits New Daily Production Record！

On December 15, the first round of heat injection was completed at the CEPA platform of Jinzhou 23-2 Oilfield, China's first offshore multi-layer heavy oil thermal recovery field. This marks that the progress of the first round of heat injection for the production wells in this oilfield has exceeded 90%, driving the daily crude oil production to surpass 2,000 tonnes.

Compared to conventional cold production oilfields, the development process of heavy oil thermal recovery fields is more complex. After the completion of each well, jet pump trial production is first conducted. When the heavy oil's fluidity decreases and production declines, operators retrieve the pump core and inject high-temperature steam at 350 degrees Celsius. Following multiple operational stages such as heat injection, soaking phase, and flowback, operators reinstall the jet pump core for crude oil lifting, thereby releasing the production capacity of the heavy oil. As the heat injection progress advances, the daily crude oil production of the Jinzhou 23-2 Oilfield continues to rise.

The Bohai Oilfield boasts abundant heavy oil resources, with the Liaodong Bay serving as the primary area for heavy oil thermal recovery. Adhering to the overall strategic framework of "pilot testing, expanded testing, demonstration application, and scaled implementation," the Engineering Technology and Operations Center of the Tianjin Branch of CNOOC Limited has focused on unconventional heavy oil. It has successively contributed to the development of China's first large-scale thermal recovery demonstration offshore oilfield, the Luda 21-2 Oilfield, and the country's first large-scale offshore thermal recovery project for extra-heavy and ultra-heavy oil, the Luda 5-2 North Oilfield, effectively translating reserves into production.

The transformation of heavy oil reserves into production capacity has been achieved through a series of breakthroughs in thermal recovery engineering technologies tailored to offshore conditions. Facing the dual challenges of "complex reservoirs + 350°C high temperatures" during the layered development of directional wells in the Jinzhou 23-2 Oilfield, the Bohai Oilfield has adopted the core principles of optimizing wellbore quality and maximizing production capacity construction. This approach has effectively addressed the challenges of large-scale development of offshore thin interbedded heavy oil reservoirs, significantly reducing the drilling and completion cycle time.

At the Jinzhou 23-2 Oilfield, all production wells have achieved integrated injection-production technology. This approach maximizes the utilization of steam thermal energy and converts it into extraction efficiency.

Through years of engineering practice in the Liaodong Bay and other heavy oil production areas, the heavy oil thermal recovery technology system of the Bohai Oilfield has been continuously enriched. The application scope has expanded from edge-water reservoirs to bottom-water reservoirs, from thin layers to thick layers and thin interbedded layers, and from conventional heavy oil to extra-heavy oil. The adaptability of the technology system continues to broaden, and its upgrading and iteration are accelerating.

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