摘要
为提高CO_(2)泡沫压裂液稳定性,使用十八酰胺双子表面活性剂(乙撑基-双十八酰胺丙基二甲基氯化铵)、八酰胺双子表面活性剂(乙撑基-双八酰胺丙基二甲基氯化铵)与不同粒径的纳米颗粒配制不同比例发泡基液.通过高温高压发泡装置、IKA黏度计、Teclis Tracker-S界面流变仪测定了发泡体积和泡沫半衰期,确定了具有最佳发泡能力及泡沫稳定性时溶液的成分,并研究了温度、NaCl质量浓度对最佳发泡溶液发泡性能的影响规律.结果表明:0.1%80 nm SiO_(2)-1.0%八酰胺表面活性剂溶液泡沫性能最佳,泡沫的耐高温性能及对Na~+的适应能力较好,且泡沫压裂液整体黏弹性提高,最佳发泡体积及泡沫半衰期分别为540 mL,63.30 min.当温度低于50℃,NaCl质量浓度低于2.0 g/L时,更利于纳米SiO_(2)与八酰胺表面活性剂溶液协同稳泡.泡沫半衰期随溶液中八酰胺表面活性剂质量分数升高而升高,当八酰胺表面活性剂质量分数从0.2%增加到1.0%,泡沫半衰期增大12倍;泡沫半衰期随纳米SiO_(2)质量分数升高(0.1%~0.5%)而降低,其质量分数每升高0.1%,泡沫半衰期约降低13 min;泡沫半衰期与纳米颗粒种类有显著关系,与粒径则无.在纳米颗粒粒径较大时,发泡体积较高.本研究展现了纳米技术在煤层压裂过程中的潜在应用,对促进CO_(2)泡沫压裂技术的发展具有重要的理论和实践价值.
In order to enhance the stability of CO_(2) foam fracturing fluid, this study utilized octadecanamide(ethyl-double octadecanamide propyl dimethyl ammonium chloride) and octamamide(ethyl-double octamamide propyl dimethyl ammonium chloride) gemini surfactants with varying sizes of nanoparticles to configure different ratios of foaming base fluid. The foaming volume and foam half-life time were assessed using a high-temperature and high-pressure foaming device, an IKA viscometer, and a Teclis Tracker-S interface rheometer. The composition of the solution with the optimal foaming volume and foam stability was identified, and the effects of temperature and NaCl mass concentration on the foam performance of the ideal foaming solution were investigated. The results show that the foam performance of the 0.1% 80 nm SiO_(2)-1.0% octamamide solution exhibits the best performance, demonstrating better resistance to high temperature and adaptability to Na~+. Moreover, the overall viscoelasticity of the foam fracturing fluid is increased, with an optimal foam volume and foam half-life of 540 mL and 63.30 min, respectively. The study also finds that the temperature below 50 ℃ and NaCl mass concentration below 2.0 g/L are more favorable for the synergistic stabilization of SiO_(2) nanoparticles and octamamide solution. An increase in the mass fraction of octamamide from 0.2% to 1.0% resulted in a twelve-fold increase in foam half-life. Conversely, when the mass fraction of nano-SiO_(2) is increased from 0.1% to 0.5%, the foam half-life decreases by approximately 13 min for each 0.1% increase in mass fraction. The type of nanoparticles significantly influences the foam half-life, but not their size. Additionally, a larger nanoparticle size results in a higher foaming volume. This study demonstrates the potential application of nanotechnology in the coal seam fracturing process, offers new ideas to improve foam stability, and has important theoretical and practical implications for promoting the development of CO_(2) foam fracturing technology.
作者
刘晓琴
翟成
郑仰峰
吴西卓
孙勇
丛钰洲
唐伟
LIU Xiaoqin;ZHAI Cheng;ZHENG Yangfeng;WU Xizhuo;SUN Yong;CONG Yuzhou;TANG Wei(School of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou,Jiangsu 221ll6,China;Key Laboratory of Gas and Fire Control for Coal Mines,Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221l16,China;School of Law-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221l16,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2023年第5期963-975,共13页
Journal of China University of Mining & Technology
基金
国家杰出青年科学基金项目(51925404)
中国矿业大学未来科学家计划项目(2022WLKXJ024)
江苏省研究生科研与实践创新计划项目(KYCX22_2654)。
