【ECF Weekly】China CCER Officially Restarted

【 Changqing Oilfield First Adopts Liquid Nitrogen Foam Technology to Achieve Results 】

The pilot test of the new nitrogen foam fracturing technology of CNPC Changqing Sulige Gas Field in a sidetracking directional well in Su14 Block was successfully completed. Technical data shows that a total of 255 cubic meters of liquid nitrogen were injected, with a carrying capacity of 78.4 cubic meters and a water consumption of only 370 cubic meters. The open flow rate for gas testing reached 429200 cubic meters per day, saving 50% of water consumption compared to conventional fracturing processes, reducing safety and environmental protection risks, and improving the gas testing effect by more than 20%, becoming a new engine for efficient development of tight gas reservoirs.

【 Breakthrough in Carbon Dioxide Refracturing and Oil Displacement Technology for Horizontal Well Borehole Reconstruction in China 】

On October 24th, it was learned that the first horizontal well in Block 156 of the tight oil reservoir in Huaqing Oilfield, including wellbore reconstruction, carbon dioxide re fracturing, and fracturing oil displacement agent test well SP8-8, was successfully completed. A total of 20 sections and 60 clusters were fractured, and 2400 tons of liquid carbon dioxide were injected. The pressure diffusion during the closed well stage was stable, 4.5 MPa higher than conventional techniques, marking the continuous integration of volume fracturing, gas flooding, chemical flooding, and other enhanced oil recovery technologies in the old oilfield, Further iteration and upgrading of fracturing and oil displacement technology for reconstructing the seepage field of horizontal wells.