Petroleum Science >2022,??lssue 2:??- DOI: https://doi.org/10.1016/j.petsci.2021.09.045
Carbon nanotube enhanced water-based drilling fluid for high temperature and high salinity deep resource development Open?Access
文章信息
作者：Jing-Ping Liu, Xian-Fa Zhang, Wen-Chao Zhang, Kai-He Lv, Yin-Rui Bai, Jin-Tang Wang, Xian-Bin Huang, Jia-Feng Jin, Jin-Sheng Sun,
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投稿时间：
引用方式：Jing-Ping Liu, Xian-Fa Zhang, Wen-Chao Zhang, Kai-He Lv, Yin-Rui Bai, Jin-Tang Wang, Xian-Bin Huang, Jia-Feng Jin, Jin-Sheng Sun, Carbon nanotube enhanced water-based drilling fluid for high temperature and high salinity deep resource development, Petroleum Science, Volume 19, Issue 2, 2022, Pages 916-926,
文章摘要
Abstract
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 °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%.
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 °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%.
关键词
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High temperature; Water-based drilling fluid; High salinity; Carbon nanotube; Deep resources