Abstract

Excessive torque on tool surfaces resulting in friction and wear in the process of well drilling remains a big challenge for the oil and gas exploration industry. In this study, two kinds of glycerides are encapsulated and serve as lubrication additives to improve the tribological properties of water-based drilling mud. It is found that encapsulation improved the thermal stability of microcapsules. In addition, tribological experiments were carried out using a ball-on-disc tribometer. Results revealed that glyceryl monostearate (GMS)-filled microcapsules largely improved the tribological properties of drilling mud compared to empty microcapsules and glyceryl tristearate (GTS)-filled microcapsules and contributed a protective film on the worn surface formed by released lubricants. However, increasing the amount of lubricant additives failed to further improve the friction reduction performance. Moreover, a remarkable decrease in damage and wear cracks indicated excellent antiwear properties of GMS-filled microcapsules.

摘要

工具表面上的过大扭矩会导致钻井过程中的摩擦和磨损，这对石油和天然气勘探行业仍然是一个巨大的挑战。在这项研究中，两种甘油酯被封装并用作润滑添加剂，以改善水基钻探泥浆的摩擦学性能。发现封装改善了微胶囊的热稳定性。另外，使用圆盘摩擦计进行摩擦学实验。结果表明，与空的微胶囊和三硬脂酸甘油酯（GTS）填充的微胶囊相比，单硬脂酸甘油酯（GMS）填充的微胶囊大大改善了钻井泥浆的摩擦学性能，并在由释放的润滑剂形成的磨损表面上形成了保护膜。然而，增加润滑剂添加剂的量不能进一步提高减摩性能。此外，损伤和磨损裂纹的显着降低表明填充GMS的微胶囊具有出色的抗磨性能。