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Simultaneous Control of Formation and Growth of Asphaltene Solids and Wax Crystals Using Single-Walled Carbon Nanotubes: an Experimental Study under Real Oilfield Conditions
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-08-26 , DOI: 10.1021/acs.energyfuels.1c02244
Saber Mohammadi 1 , Fatemeh Mahmoudi Alemi 1
Affiliation  

Asphaltene and wax depositions in oil production systems have been recognized as the most serious flow assurance concern of petroleum engineering. Despite the several chemicals offered for treatment of issues induced by these organic deposits, proposing a single efficient chemical to control simultaneously both asphaltene and wax precipitation has not been attended yet. Here, single-walled carbon nanotubes (SWCNTs) were synthesized to assess their effects on controlling the formation and size growth of asphaltene particles and wax crystals in live oil under realistic production conditions. SDS experiments showed that during depressurization at 125 °C, the asphaltene onset pressure decreased from 5946 psi in untreated live oil to 4375 in treated live oil with 100 ppm SWCNTs. High-pressure microscopy revealed that SWCNTs efficiently controlled the growth of asphaltene aggregates and reduced the size of asphaltenes in live oil during depressurization at 125 °C. This is ascribed to the strong π–π interactions between the aromatic rings of SWCNTs and electron clouds of asphaltenes. Results of cross-polarized microscopy showed that SWCNTs at an optimum concentration of 75 ppm postponed the wax formation temperature and gelation point from 32.6 and 21.5 °C to 23.2 and 14.7 °C, respectively. In addition, the morphology of the wax crystals with an average size of 756 nm in untreated oil changed from dense spherical-like into thin needle-like with an average size of 86 nm in treated oil with SWCNTs at 75 ppm. The changes in the wax crystal size and structure via X-ray powder diffraction analysis after crude oil treatment with SWCNTs confirm interactions between the carbon nanotubes and active sites of the wax crystals. The findings of this research prove that synthesized carbon nanotubes can be used as efficient inhibitor and dispersant agents for stabilizing the waxes and asphaltenes in live oil with controlling the rate of aggregation under high-pressure–high-temperature conditions.

中文翻译:

使用单壁碳纳米管同时控制沥青质固体和蜡晶体的形成和生长:实际油田条件下的实验研究

石油生产系统中的沥青质和蜡沉积已被认为是石油工程中最严重的流动保障问题。尽管提供了几种用于处理由这些有机沉积物引起的问题的化学品,但尚未提出一种单一的有效化学品来同时控制沥青质和蜡沉淀。在这里,合成了单壁碳纳米管 (SWCNT) 以评估它们在实际生产条件下对控制活油中沥青质颗粒和蜡晶体的形成和尺寸增长的影响。SDS 实验表明,在 125 °C 减压期间,沥青质起始压力从未经处理的活油中的 5946 psi 降至含有 100 ppm SWCNT 的处理过的活油中的 4375。高压显微镜显示,在 125 °C 减压期间,SWCNTs 有效地控制了沥青质聚集体的生长,并减少了沥青质在活油中的尺寸。这归因于 SWCNT 的芳环与沥青质的电子云之间的强 π-π 相互作用。交叉偏振显微镜的结果表明,最佳浓度为 75 ppm 的 SWCNT 将蜡形成温度和凝胶点分别从 32.6 和 21.5 °C 推迟到 23.2 和 14.7 °C。此外,未处理油中平均尺寸为 756 nm 的蜡晶体的形态从致密的球形变为细针状,在处理过的油中使用 75 ppm 的单壁碳纳米管,平均尺寸为 86 nm。用 SWCNT 处理原油后,通过 X 射线粉末衍射分析,蜡晶体尺寸和结构的变化证实了碳纳米管与蜡晶体活性位点之间的相互作用。这项研究的结果证明,合成的碳纳米管可作为有效的抑制剂和分散剂,用于稳定活油中的蜡和沥青质,并控制高压-高温条件下的聚集速率。
更新日期:2021-09-16
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