Carbon nanotube enhanced water-based drilling fluid for high temperature and high salinity deep resource development
Carbon nanotube enhanced water-based drilling fluid for high temperature and high salinity deep resource development
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用于高温高盐深层资源开发的碳纳米管增强水基钻井液
DOI：
10.1016/j.petsci.2021.09.045
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发表时间：
2022-04-01
影响因子：
5.6
通讯作者：
Sun, Jin-Sheng
中科院分区：
文献类型：
--
作者：
Liu, Jing-Ping;Zhang, Xian-Fa;Sun, Jin-Sheng
高温高盐深层油藏钻井液面临失效问题。实验结果表明，高温和盐度降低了钻井液中膨润土表面的负电荷，导致膨润土颗粒聚结。结果，颗粒聚结，网格结构被破坏，流变性能、持岩能力和过滤性能丧失。为了解决上述问题，在本研究中，在温度和添加的氯化钠浓度分别达到180℃和10wt%的条件下，将0.05wt%的碳纳米管引入到4%的膨润土钻井液中。碳纳米管吸附在膨润土表面并增加膨润土颗粒之间的空间。位阻阻止膨润土在高温高盐环境下聚结。因此膨润土保持了膨润土的小尺寸分布并支撑了钻井液中的膨润土网格结构。钻井液携岩能力提高85.1%。而且小尺寸膨润土颗粒堆积形成的泥饼致密；膨润土钻井液滤失率降低30.2%。 (C) 2022 作者。 Elsevier B.V. 代表科爱通讯有限公司提供的出版服务
Drilling fluids face failure during drilling deep reservoir with high temperature and high salt. The experimental results show that high temperature and salinity reduce the negative charge on the surface of bentonite in the drilling fluid and cause the coalescence of bentonite particles. As a result, the particles coalesce, the grid structure is destroyed, and the rheological properties, rock-carrying capacity and filtration properties are lost. To resolve the foregoing, in this study, 0.05-wt% carbon nanotubes are introduced into a 4% bentonite drilling fluid under conditions where the temperature and concentration of added NaCl reach 180 degrees C and 10 wt%, respectively. The carbon nanotubes adsorb on the bentonite surface and increase the space among bentonite particles. The steric hindrance prevents the coalescence of bentonite in high temperature and high salt environment. Thus bentonite maintains the small size distribution of bentonite and supports the bentonite grid structure in the drilling fluid. As a result, the rock-carrying capacity of the drilling fluid increases by 85.1%. Moreover, the mud cake formed by the accumulation of small-sized bentonite particles is dense; consequently, the filtration of bentonite drilling fluid reduced by 30.2%. (C) 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.