氯化胆碱
钻井液
深共晶溶剂
润滑油
PEG比率
聚乙二醇
化学工程
材料科学
共晶体系
润滑
离子液体
溶剂
热稳定性
吸附
化学
无机化学
复合材料
有机化学
冶金
钻探
微观结构
财务
经济
工程类
催化作用
作者
Weiping Zhu,Xiuhua Zheng
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-10-20
卷期号:7 (43): 38380-38388
被引量:5
标识
DOI:10.1021/acsomega.2c03227
摘要
Drilling fluid lubricants guarantee safe and fast drilling. When drilling high-temperature or NaCl/CaCl2-containing formations, there is an urgent need to develop environmentally friendly lubricants that are resistant to high temperature and ionic contamination. In this study, a deep eutectic solvent (DES) ChCl-PEG lubricant for a water-based drilling fluid was designed and prepared. ChCl-PEG is a kind of biodegradable material with high thermal stability formed by hydrogen bonding between choline chloride (ChCl) and polyethylene glycol (PEG). Within 240 °C, ChCl-PEG significantly improved the lubricating properties of drilling fluids and mud cakes. The lubrication coefficient (K) was controlled within 0.2, and the reduction rate of the adhesion coefficient (Δf) was higher than 40%. The salt and calcium resistances of ChCl-PEG at high temperature (150 °C) are as high as 36% NaCl and 20% CaCl2. Under these conditions, ChCl-PEG maintains a low value of K: 0.097-0.157 (5-36% NaCl) and 0.145-0.162 (5-20% CaCl2), respectively. Also, it maintains higher values of Δf, which can reach up to 51.6% and 80%. The lubricating mechanism of ChCl-PEG can be summarized as the adsorption of ChCl and the formation of a large number of hydrated molecules.
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