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Effect of Polymethylsilsesquioxane (PMSQ) Microspheres on Cyclopentane Hydrate Formation in Waxy Oil–Water Systems
Energy & Fuels ( IF 5.2 ) Pub Date : 2024-01-24 , DOI: 10.1021/acs.energyfuels.3c04405
Lexin Zhang 1, 2 , Zhen Long 1, 2 , Yong He 2 , Jinhang Wang 2 , Xuebing Zhou 2 , Lingli Shi 2 , Deqing Liang 1, 2
Energy & Fuels ( IF 5.2 ) Pub Date : 2024-01-24 , DOI: 10.1021/acs.energyfuels.3c04405
Lexin Zhang 1, 2 , Zhen Long 1, 2 , Yong He 2 , Jinhang Wang 2 , Xuebing Zhou 2 , Lingli Shi 2 , Deqing Liang 1, 2
Affiliation
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Wax deposition and hydrate formation are two unwelcome problems that can threaten the safety of pipeline transportation in the oil and gas industry. The existing prevention methods mainly aim at the flow blockage resulting from single solid phase, but rarely take into account multi-solid-phase systems, such as hydrate-wax, hydrate-sand, etc. Recently, it has been proposed that adding pour point depressants (PPDs) can not only improve the rheological property of waxy oil but also have potential to inhibit hydrate formation. In this study, a series of PPD polymethylsilsesquioxane (PMSQ) microspheres were synthesized by a two-step sol–gel method. First, the effect of PMSQ microspheres on wax deposition in waxy mineral oil was tested by differential scanning calorimetry (DSC). Then, the influence of PMSQ microspheres on the cyclopentane (CP) hydrate formation in waxy oil–water systems at the atmospheric pressure and temperature of −3 °C was investigated by using a self-assembly high-pressure reactor. The experimental results showed that the addition of PMSQ microspheres could reduce the wax appearance temperature (WAT) of waxy oil and prolong the nucleation time of the CP hydrate. Powder X-ray diffraction and laser confocal micro-Raman data indicated that the presence of PMSQ did not affect the sII crystal structure of the CP hydrates. A possible inhibition mechanism of PMSQ microspheres by the steric hindrance effect was proposed.
中文翻译:
聚甲基倍半硅氧烷 (PMSQ) 微球对含蜡油水体系中环戊烷水合物形成的影响
蜡沉积和水合物形成是威胁石油和天然气行业管道运输安全的两个不受欢迎的问题。现有的预防方法主要针对单固相引起的流动堵塞,而很少考虑到多固相体系,如水合物-蜡、水合物-砂等。近年来,有人提出添加倾点抑制剂(PPD)不仅可以改善蜡油的流变性能,还具有抑制水合物形成的潜力。在本研究中,通过两步溶胶-凝胶法合成了一系列PPD聚甲基倍半硅氧烷(PMSQ)微球。首先,通过差示扫描量热法(DSC)测试了PMSQ微球对含蜡矿物油中蜡沉积的影响。然后,利用自组装高压反应器研究了大气压和-3℃温度下PMSQ微球对含蜡油水体系中环戊烷(CP)水合物形成的影响。实验结果表明,PMSQ微球的添加可以降低蜡质油的出蜡温度(WAT),延长CP水合物的成核时间。粉末X射线衍射和激光共焦显微拉曼数据表明PMSQ的存在不会影响CP水合物的sII晶体结构。提出了一种可能的空间位阻效应对PMSQ微球的抑制机制。
更新日期:2024-01-24
中文翻译:
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聚甲基倍半硅氧烷 (PMSQ) 微球对含蜡油水体系中环戊烷水合物形成的影响
蜡沉积和水合物形成是威胁石油和天然气行业管道运输安全的两个不受欢迎的问题。现有的预防方法主要针对单固相引起的流动堵塞,而很少考虑到多固相体系,如水合物-蜡、水合物-砂等。近年来,有人提出添加倾点抑制剂(PPD)不仅可以改善蜡油的流变性能,还具有抑制水合物形成的潜力。在本研究中,通过两步溶胶-凝胶法合成了一系列PPD聚甲基倍半硅氧烷(PMSQ)微球。首先,通过差示扫描量热法(DSC)测试了PMSQ微球对含蜡矿物油中蜡沉积的影响。然后,利用自组装高压反应器研究了大气压和-3℃温度下PMSQ微球对含蜡油水体系中环戊烷(CP)水合物形成的影响。实验结果表明,PMSQ微球的添加可以降低蜡质油的出蜡温度(WAT),延长CP水合物的成核时间。粉末X射线衍射和激光共焦显微拉曼数据表明PMSQ的存在不会影响CP水合物的sII晶体结构。提出了一种可能的空间位阻效应对PMSQ微球的抑制机制。