▎ 摘　　要

NOVELTY - Method for reducing friction and torsion of water-based drilling fluid, involves: i) pumping thick slurry to well bottom; ii) after well washing, pumping the well slurry containing first liquid lubricant, to the bottom of the well; iii) after pumping is completed, continuously pumping the well mud containing solid lubricant to the bottom of the well. After the pumping is completed, the movable drilling tool continues to drill. In the process of drilling, the whole well mud supplements the second liquid lubricant. USE - Method is used for reducing friction and torsion of water-based drilling fluid. ADVANTAGE - In the process, the well mud containing solid lubricant pumped into well, acts as a ball bearing on the basis of a sufficient amount of local lubricant, and the high-tough lubricating film further reduces the frictional torque. The whole well mud supplements the second liquid lubricant to consolidate the lubrication effect and improve the long-term performance. The method enables full use of the film lubrication mechanism of liquid lubricants, and the sheet effect and ball effect of solid lubricants, to improve the 'mmediate effect' of lubricants, to achieve the purpose of reducing friction and torsion, while assisting the horizontal displacement of long-reach wells or long horizontal wells.