With the increasing amount of drilling of directional wells and large‐displacement wells, high torque and high resistance have become critical problems. Therefore, high‐performance and environment‐friendly lubricants for water‐based drilling fluid are urgently needed. In this paper, poly(ethylene glycol) 2000 (PEG) was used as a lubricant, and the lubricity, inhibition, compatibility and temperature resistance of the PEG lubricant were investigated. The results show that 0.1% (mass ratio) PEG in water‐based drilling fluid can reduce the friction coefficient of mud cake by 44.5%. This PEG also has certain inhibition and temperature resistance. As PEG is used with other drilling fluid additives, the compatibility was good and the lubricity of drilling fluid can be improved effectively. The lubricating mechanism of PEG was explored and the results showed that the hydrophobic alkane chains in the PEG molecules were adsorbed on the surface of bentonite, forming a hydrophobic film on the friction surface, thereby forming a lubricating layer. Field application in Sulige Gas Field showed that the PEG lubricant has good lubricity and can meet the technical requirements of corresponding horizontal wells. © 2020 Society of Industrial Chemistry

中文翻译：

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苏里格气田水平井水基钻井液中聚乙二醇润滑剂的评价与应用

随着定向井和大排量井钻井量的增加，高扭矩和高阻力已成为关键问题。因此，迫切需要用于水性钻井液的高性能和环保型润滑剂。本文以聚乙二醇2000（PEG）为润滑剂，研究了PEG润滑剂的润滑性，抑制性，相容性和耐热性。结果表明，水基钻井液中PEG的0.1％（质量比）可使泥饼的摩擦系数降低44.5％。该PEG还具有一定的抑制作用和耐热性。由于PEG与其他钻井液添加剂一起使用，相容性好，可有效改善钻井液的润滑性。探索了PEG的润滑机理，结果表明，PEG分子中的疏水性烷烃链吸附在膨润土的表面，在摩擦表面形成疏水性膜，从而形成润滑层。苏里格气田的现场应用表明，聚乙二醇润滑剂具有良好的润滑性，可以满足相应水平井的技术要求。©2020工业化学学会