Abstract: Conventional directional drilling mainly relies on the sliding of screw motor and drill string to realize the change of wellbore trajectory, so the friction force is large. The use of friction reduction tools that generate ...

Abstract: In the process of long horizontal well in directional drilling, serious contact between drill string and wellbore leads to weight on bit loss. Therefore, this paper proposes a drill string rotary controller (DSC) for ...

Abstract: A method is developed to calculate crop water consumption based on the water balance principle. An independently designed emitter resistant to clogging caused by negative pressure (EK) is also evaluated. The water-use ...

Abstract: Aiming at the problem of low drilling efficiency of oil and gas wells due to the high friction during the drilling, a dual-piston axial oscillation drag reduction tool (DAOT) is proposed to reduce friction for long drill ...