As increased resource and environmental pressures lead to increased R&D activities and the application of CO₂ EOR in the global petroleum community, CNPC has witnessed breakthroughs in basic theory research, technical and technological R&D and integration, and field pilot tests of CO₂-bearing gas field development and CO₂ flooding technologies, following two years of intensified research. This has supported the safe and efficient development of those gas fields and the effective utilization and storage of CO₂ resources.

Five new achievements provide references for engineering design: (1) establishment of a theoretical framework for the formation and enrichment of CO₂ in the Songliao Basin; (2) identification of the characteristics and seepage pattern of volcanic rock reservoirs; (3) clear understanding of phase behavior and displacement mechanism of CO₂ and in-place crude systems; (4) identification of CO₂ corrosion and protection mechanisms; and (5) deepened understanding of basic gathering and transportation issues related to CO₂-bearing natural gas.

Two technological packages have been developed and integrated, with their field experiment plans prepared: (1) Safe development of CO₂-bearing natural gas, including gas reservoir engineering, safe drilling and completion, recovery techniques, gathering, transportation, and processing technologies of CO2-bearing natural gas; (2) EOR by CO₂ flooding, including optimal design, injection-recovery techniques, monitoring, extending of sweeping volume, and surface engineering.

Two sets of 40 technical standards and two HSE systems have been established to ensure the safe and normalized implementation of field tests.

Pilot recovery of CO₂-bearing gas and the field test of CO₂ flooding are under smooth way in Jilin Oilfield. The recovery efficiency by CO₂ flooding is expected to be 13%+ higher than water flooding.