Preparation of molybdenum disulfide/bentonite nanohybrid and its tribological properties as lubricant for water-based drilling fluids

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Tribology International Pub Date : 2024-10-10 DOI:10.1016/j.triboint.2024.110309

Xue Wang , Congcong Ma , Guangbin Yang , Shengmao Zhang , Yujuan Zhang , Zhengquan Jiang , Laigui Yu , Pingyu Zhang

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Abstract

In recent years, with the increase in energy demand and gradual scarcity of medium and shallow oil and gas resources, oil and gas exploration has shifted to special wells such as deep wells, ultra-deep wells, and extended reach wells. These complex wellbore structures inevitably increase the torque and friction between the casing and the drill pipe during drilling, which aggravates friction and wear, and leads to accidents such as drill sticking and drill breakage in severe cases. In this study, molybdenum disulfide/bentonite (MoS₂/Bent) nanohybrids as drilling fluid lubricant were synthesized by hydrothermal method using sodium molybdate (Na₂MoO₄) and thiourea (CH₄N₂S) as raw materials and bentonite as carrier. The as-synthesized MoS₂/Bent nanohybrid was characterized by X-ray powder diffractometer, transmission electron microscopy, Fourier transform infrared spectroscopy, and the high temperature resistance and tribological properties of MoS₂/Bent nanohybrid were evaluated in base slurry. The results show that the friction coefficient of MoS₂/Bent nanohybrid drilling fluid before aging is reduced by 74 % and the wear rate is reduced by 97 % compared with the base slurry. After high-temperature aging at 240 °C, the friction coefficient is reduced by 77 % and the wear rate is reduced by 90 %. The excellent friction reducing and antiwear performance is attributed to the formation of low shear strength MoS₂ deposition film and oxide tribofilm on the surface of the friction pair during the rubbing process.

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二硫化钼/膨润土纳米杂化物的制备及其作为水基钻井液润滑剂的摩擦学特性

近年来，随着能源需求的增加和中浅层油气资源的逐渐匮乏，油气勘探已转向深井、超深井、延伸井等特殊井。这些复杂的井筒结构不可避免地增加了钻井过程中套管与钻杆之间的扭矩和摩擦力，加剧了摩擦和磨损，严重时会导致卡钻、断钻等事故。本研究以钼酸钠（Na2MoO4）和硫脲（CH4N2S）为原料，以膨润土为载体，通过水热法合成了二硫化钼/膨润土（MoS2/Bent）纳米杂化物作为钻井液润滑剂。利用 X 射线粉末衍射仪、透射电子显微镜、傅立叶变换红外光谱对合成的 MoS2/Bent 纳米杂化物进行了表征，并在基浆中对 MoS2/Bent 纳米杂化物的耐高温性能和摩擦学性能进行了评价。结果表明，与基础泥浆相比，老化前 MoS2/Bent 纳米杂化钻井液的摩擦系数降低了 74%，磨损率降低了 97%。在 240 °C 高温老化后，摩擦系数降低了 77%，磨损率降低了 90%。优异的减摩抗磨性能归功于摩擦过程中在摩擦副表面形成的低剪切强度 MoS2 沉积膜和氧化物三膜。

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.