Kelly Bushing Rollers
Definition - What does Kelly Bushing Rollers mean?
Kelly Bushing Rollers are tools that are used in the drilling process to drive the Kelly pipe. These rollers are important as they are designed for high torque drilling and high speed conditions. They are equipped for a square Kelly or a hex Kelly. They are manufactured with various features like optional lock assembly, interchangeable components, etc. By rotating the rollers, the friction between the Kelly pipes and rolls can be reduced.
Petropedia explains Kelly Bushing Rollers
Kelly Bushing Rollers are essential for driving the Kelly so as to reduce the frictional resistance to basic movement of the Kelly. It is preferable to provide rollers with large diameters in order to exchange every face of the Kelly. These rollers can be pin drives or square drives whose sizes can be changed for accommodating the bushings. These rollers have three series - medium duty (MD), heavy Duty (HD) and standard duty (SD). The parts of drive bushing are exposed to vibration, reversing stresses and high impact forces, hence it is important to ensure that the various components of the rollers are rugged and simple so as to withstand adverse operating conditions of the service.