以茶皂苷为原料的煤层气储层泡沫压裂用起泡剂.

郗宝华; 刘东娜

Foam fracturing is a common technical mean in the fracturing and stimulation of coalbed methane reservoir. The selection of foaming agent is particularly important. In order to develop a foaming agent with better foam performance, lower cost and excellent comprehensive performance, the foaming agent (HBS-J) was prepared from tea saponin, alkenyl succinic anhydride and sodium bisulfite by esterification and sulfonation. The structure of HBS-J was characterized by infrared spectrum, and then the foaming property, salt and oil resistance, surface activity, and reservoir protection of HBS-J were evaluated. The results showed that HBS-J had good foaming performance, salt and oil resistance, and surface activity. When the mass fraction of HBS-J was 0.3%, the foaming volume was 590 mL, the half-life of foam was 2562 s, and then the composite index of foam could reach 25 193 mL·min, indicating strong foaming ability and foam stability. When the mass concentrations of Na+, Ca2+ and Mg2+ in brine solution were 79 310, 5405 and 2021 mg/L respectively or the volume fraction of kerosene reached 25%, HBS-J could still form a relatively stable foam system. Furthermore, its foaming ability and salt and oil resistance were significantly better than those of traditional foaming agents, such as sodium dodecyl sulfate, sodium α-olefin sulfonate, coconut amidopropyl betaine. When the mass fraction of HBS-J was 0.25%—0.35%, the surface tension of solution (about 40 mN/m) was relatively low. The reservoir protection performance of HBS-J was good. The damage rate to the permeability of coalbed matrix was less than 10%. It would not cause serious damage to the coalbed methane reservoir during foam fracturing construction. HBS-J met the requirements of coalbed methane reservoir foam fracturing construction on the comprehensive performance of foaming agent.

SURFACE active agents; SODIUM dodecyl sulfate; COALBED methane; SURFACE tension; SUCCINIC anhydride

Oilfield Chemistry, 2024, Vol 41, Issue 4, p610

1000-4092

Academic Journal

10.19346/j.cnki.1000-4092.2024.04.006