以茶皂苷为原料的煤层气储层泡沫压裂用起泡剂
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国家自然科学基金面上项目“不同变质程度煤纳米结构的深化特征及机制”(项目编号201901D111050)


Foaming Agent for Foam Fracturing of Coalbed Methane Reservoir with Tea Saponin as Raw Material
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    摘要:

    泡沫压裂是煤层气储层压裂增产改造中常用的一种技术手段,起泡剂的选择尤为重要。为了研究出泡沫性能更好、成本更低以及综合性能优良的起泡剂,以茶皂苷、烯基琥珀酸酐和亚硫酸氢钠为原料,通过酯化和磺化反应制备了起泡剂(HBS-J),通过红外光谱表征了HBS-J 的结构,评价了HBS-J 的起泡性、耐盐耐油性、表面活性和储层保护性等。结果表明,HBS-J 的起泡性能、耐盐耐油性能和表面活性均较好。当 HBS-J 的质量分数为0.3%时,起泡体积为590 mL,泡沫半衰期为2562 s,泡沫综合指数可以达到25 193 mL·min,发泡能力和泡沫稳定 性均较强;当盐水溶液中Na+、Ca2+、Mg2+质量浓度分别为79 310、5405、2021 mg/L 或者煤油体积分数达到25%时, HBS-J 仍能形成比较稳定的泡沫体系,并且其起泡能力和耐盐耐油能力均明显优于传统起泡剂(十二烷基硫酸钠、α-烯烃磺酸钠、椰油酰胺丙基甜菜碱)。当HBS-J 的质量分数为0.25%~0.35%时,溶液的表面张力(约40 mN/m)较低。HBS-J 的储层保护性能良好,对煤层基质渗透率的伤害率小于 10%,在泡沫压裂施工过程中不会对煤层气储层造成严重的伤害。HBS-J满足煤层气储层泡沫压裂施工对起泡剂综合性能的要求。

    Abstract:

    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.

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郗宝华,刘东娜.以茶皂苷为原料的煤层气储层泡沫压裂用起泡剂[J].油田化学,2024,41(4):610-615.
XI Baohua, LIU Dongna. Foaming Agent for Foam Fracturing of Coalbed Methane Reservoir with Tea Saponin as Raw Material[J]. OILFIELD CHEMISTRY,2024,41(4):610-615.

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  • 在线发布日期: 2025-01-12
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