Research on the Development Technology of CO2 Uptake in Complex Fault-Block Heavy Oil Reservoirs

CO2 uptake is an important technical means for the development of shallow heavy oil reservoirs on land in Nanpu, Jidong. In recent years, with the increase of uptake rounds, the uptake effect has gradually deteriorated and the validity period has gradually shortened. There is an urgent need to carry out research on the optimization of CO2 uptake development technology. By summarizing factors such as the structural location, the length of the production well section and the number of throughput cycles, the influencing factors of the throughput effect of shallow heavy oil reservoirs are clarified. By establishing the CMG model and combining reservoir engineering algorithms, the influence of CO2 uptake and emission on production capacity under different influencing factors is studied, thereby optimizing reasonable development technical countermeasures. Considering the production capacity and the input-output relationship in the economy, optimize the CO2 injection volume and daily liquid production volume for different throughput rounds. The research results show that: ① Wells with higher structural positions and longer production well sections require a higher reasonable amount of CO2 injection, while Wells with lower structural positions and shorter production well sections require a smaller reasonable amount of CO2 injection. ② Wells with high structural positions and long production well sections have a higher reasonable daily liquid production capacity, while those with low structural positions and short production well sections have a smaller daily liquid production capacity. ③ Wells with high structural positions and long production well sections have a higher number of ultimate throughput cycles, while those with low structural positions and short production well sections have a lower number of ultimate throughput cycles. The research results are of guiding significance for improving the CO2 uptake development of the shallow heavy oil reservoir on land in Nanpu, Jidong Oilfield.