ABSTRACT
Extended reach well drilling technology is a new drilling technology developed in China in 1990s, which is actually a comprehensive embodiment of directional well, horizontal well, deep well and ultra-deep well technology. Aiming at the technical difficulties of large friction and torque in extended reach wells, as well as the requirements of wellbore trajectory control and wellbore stability. This paper analyzes the key drilling technologies of extended reach wells, and discusses the well trajectory design technology, steering drilling technology, high-quality drilling fluid technology with high lubrication and strong inhibition, friction and torque prediction and monitoring technology in the implementation of extended reach horizontal wells. This paper analyzes the technical difficulties and strategies of extended reach horizontal well drilling, in order to promote the application of extended reach horizontal well drilling technology and improve the level of oil production.
