Core Insights - The Fuman Oilfield, China's largest ultra-deep oilfield, has achieved significant breakthroughs in enhanced oil recovery through pilot tests in the Fuyuan 210 and Mandeep 4 units [1] Group 1: Enhanced Oil Recovery Techniques - The Fuyuan 210 unit utilized a "high injection, low production" model, injecting nearly 50 million cubic meters of gas, resulting in an additional oil output of 34,000 tons and a threefold increase in daily oil production, achieving an annual capacity of 40,000 tons [1] - The Mandeep 4 unit employed a "top gas injection, bottom water injection, and intermediate oil extraction" approach, effectively controlling decline rates, with an expected increase in recovery rates by over 17 percentage points [1] Group 2: Research and Development Collaboration - Since the breakthrough in 2020, the research team from the China Petroleum Exploration and Development Research Institute has collaborated closely with the China Petroleum Ultra-deep Complex Oil and Gas Reservoir Exploration and Development Technology R&D Center [1] - The team developed intelligent characterization and dynamic-static reserve evaluation technologies for fault-controlled fracture-cavity reservoirs, improving the static reserve matching rate by over 20% [1] - The integration of discrete fracture-cavity medium multi-phase multi-scale coupling geological modeling and numerical simulation technology has upgraded the simulator to handle oil-gas-water three-phase interactions, revealing fluid flow patterns in fault-controlled fracture-cavity units [1]