Study of Azodicarbonamide Gas Production and Foam Channeling Blocking Performance

This study focuses on the autogenous foam system of azodicarbonamide (AC). It aims to address the issues of poor thermal stability and safety hazards. These issues arise from using the single-fluid method to construct conventional autogenous foam systems in high-permeability reservoir flow. The results indicate that AC, as a gas-producing agent, undergoes hydrolysis at temperature above 95 °C to generate gas. Furthermore, an increase in temperature or the addition of additives can significantly enhance the gas production rate. The AC autogenous foam system comprises a gas-producing agent, polymer, foaming agent, and nano-foam stabilizing material. The polymer solution can effectively suspend AC. When the amount of high-temperature-resistant foaming agent X and nanomaterial is 0.2% and 0.5%, respectively, the foaming volume of the system at room temperature is 450 ml, the half-life is 954 s, and it has certain temperature resistance and salt resistance. The autogenous foam system demonstrates outstanding blocking capabilities determined by the drive-off experiment. The experiment is of significant importance for improving the recovery rate and insoluble granular water gas production.