Development of a High Efficient Compound Surfactant for Foam Drainage in Gas Wells

In this study, the foaming properties of a compound surfactant formula containing cetyltrimethylammonium chloride (CTAC), cocamidopropyl betaine (CDAB), fatty alcohol polyoxyethylene ether-7 (AEO7) and sodium alpha-olefin sulfonate (AOST) were evaluated to meet the application requirements for foam...

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Bibliographic Details
Published in:Petroleum chemistry 2022-09, Vol.62 (9), p.1047-1054
Main Authors: Dong, Jie, Dong, Sanbao, Miao, Zhipeng, Wang, Qingchen, Li, Yongfei, Qu, Chengtun, Chen, Gang
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Drainage
Foaming
Gas wells
Industrial Chemistry/Chemical Engineering
Natural gas
Olefins
Polyoxyethylene
Surface active agents
Surface tension
Surfactants
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Summary:In this study, the foaming properties of a compound surfactant formula containing cetyltrimethylammonium chloride (CTAC), cocamidopropyl betaine (CDAB), fatty alcohol polyoxyethylene ether-7 (AEO7) and sodium alpha-olefin sulfonate (AOST) were evaluated to meet the application requirements for foam generation and foam drainage in gas wells. The results exhibited that the foaming volume and the half-life of the compound surfactant solution (0.05 wt % CTAC + 0.7 wt % CDAB + 0.6 wt % AEO7 + 0.05 wt % AOST) can reach the values of 550 mL and 23 min, respectively, which suggested that the foaming ability and stability were improved in comparison with each solution containing a single surfactant. It showed that the surface tension can be lowered to 22.4 mN/m with the presence of the compound surfactants. Simultaneously, the microstructure of the foam was observed using a polarizing microscope, and it was found that there were almost no polyhedron structures in the foam within a certain range of formula concentrations. The results of the experiments also clarify that the formula has well properties of temperature resistance and salt resistance (measured using a high-speed agitator).
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544122090134