Ning Yuanxing, Li Yuxing, Song Guangchun, Wang Wuchang, Liu Xiang, Liu Zhiming, Zhang Jialu
Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety, China University of Petroleum, Qingdao 266580, Shandong, P. R. China.
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, P. R. China.
Langmuir. 2021 Sep 21;37(37):11072-11083. doi: 10.1021/acs.langmuir.1c01698. Epub 2021 Sep 13.
Clarifying the effect of asphaltene on hydrate formation and growth is of great significance to the operation safety in deepwater petroleum fields. To investigate the influence of low-concentration dissolved asphaltenes on the formation kinetics and growth process of hydrates in water-in-oil emulsions, experiments with asphaltene concentrations ranging from 50 to 1000 ppm were carried out using a high-pressure visual reactor. At a low concentration, the adsorption of asphaltene monomers on the oil-water interface or nanoaggregates in the bulk barely affected the nucleation of hydrate and the induction time of hydrate formation. However, it would hinder the microscopic mass transfer process and heat transfer process between gas molecules and then mitigate the initial rate of hydrate formation. Therefore, the dissolved asphaltenes could not be used as antiagglomerants (AAs) to efficiently inhibit the aggregation of hydrate particles at low concentrations under our experimental conditions, causing extensive hydrate agglomeration and deposition in the reactor.
阐明沥青质对水合物形成和生长的影响对深水油田的作业安全具有重要意义。为了研究低浓度溶解沥青质对油包水乳状液中水合物形成动力学和生长过程的影响，使用高压可视反应器进行了沥青质浓度范围为50至1000 ppm的实验。在低浓度下，沥青质单体在油水界面或本体中的纳米聚集体上的吸附几乎不影响水合物的成核和水合物形成的诱导时间。然而，它会阻碍气体分子之间的微观传质过程和传热过程，从而降低水合物形成的初始速率。因此，在我们的实验条件下，溶解的沥青质在低浓度时不能用作抗聚剂（AAs）来有效抑制水合物颗粒的聚集，导致反应器中大量水合物团聚和沉积。
