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首页> 外文期刊>Journal of natural gas science and engineering >Improving the stability of multi-walled carbon nano-tubes in extremely environments: Applications as nano-plugging additives in drilling fluids
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Improving the stability of multi-walled carbon nano-tubes in extremely environments: Applications as nano-plugging additives in drilling fluids

机译：改善极其环境中多壁碳纳米管的稳定性：应用作为钻井液中纳米堵塞添加剂的应用

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摘要

Owing to the harsh downhole environments, poor dispersion of multi-walled carbon nanotubes (MWCNTs) at high salinity and high temperature can severely limit their application in oil & gas exploitation industry. Herein, the objective of this study is to improve salt tolerance and thermal stability of MWCNTs by modification. In this study, MWCNTs was successfully functionalized with an anionic polymer by a SI-ATRP (Surface-initiated atom transfer radical polymerization) method. By varying the ratio of monomer and initiator, two composites were obtained, named MWCNTs-g-SPMA-1 and MWCNTs-g-SPMA-2, respectively. Both were well dispersed in saturated brine and standard API brine (8 wt% NaCl + 2 wt% CaCl2) for 60 days at room temperature. Moreover, the modified MWCNTs were stable at 170 degrees C for 24 h, as well as stable in weakly alkali environment. Afterwards, MWCNTs-g-SPMA-2 as the nano-plugging additive in water-based drilling fluids exhibited excellent plugging performance. The plugging efficiency reached 50.96% with adding a small amount of 0.3 wt% MWCNTs-gSPMA-2.
机译：由于苛刻的井下环境，高盐度和高温下的多壁碳纳米管（MWCNTs）的可差的分散可能会严重限制其在石油和天然气剥削工业中的应用。这里，本研究的目的是通过改性改善MWCNT的耐盐性和热稳定性。在该研究中，通过Si-ATRP（表面引发的原子传递自由基聚合）方法用阴离子聚合物成功官能化MWCNT。通过改变单体和引发剂的比例，分别获得了两种复合材料，分别命名为MWCNTS-G-SPMA-1和MWCNTS-G-SPMA-2。两者在室温下均匀地分散在饱和盐水和标准API盐水（8wt％NaCl + 2wt％CaCl 2）60天。此外，改性的MWCNT在170℃下稳定24小时，并且在弱碱环境中稳定。然后，MWCNTS-G-SPMA-2作为水基钻井液中的纳米堵塞添加剂表现出优异的堵塞性能。堵塞效率达到50.96％，加入少量0.3wt％mwcnts-gspma-2。

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