Research and Application of Consumption Reduction, Emission Reduction, and Enhanced Recovery Technology in the Middle and Later Stages of Ultra Heavy Oil SAGD Development

As the SAGD development of Fengcheng Oilfield enters the middle and late stages, the primary issue facing current production is how to sustainably, economically, and efficiently develop ultra heavy oil. Based on the actual characteristics of the Fengcheng Oilfield reservoir in Xinjiang, this study investigated the impact of interlayers on the development effectiveness of SAGD, the characterization of steam chambers in the middle and later stages of SAGD, injection production optimization, and high-temperature pressurized well repair. The research results indicate that the relative position between the interlayer and the injection production well, the distribution range of interlayer monomers, and the interlayer permeability have a significant impact on the SAGD production efficiency. In addition, by describing the developmental patterns and laws of the SAGD steam chamber at different production stages, corresponding regulatory measures can be effectively formulated; High temperature gas-liquid interface control technology can ensure the balanced development of oil reservoirs; The high-temperature pressurized well repair technology has achieved the goal of rapid and timely well repair. The research results provide reference for how to further reduce consumption, emissions, and improve development effectiveness in the later stage of SAGD development.