On the determination of design and geometric parameters of a upper bit slurry grinder

Abstract

Abstract Experimental and field studies have identified the rational geometric dimensions of elements of upper bit sludge grinder, ensuring its operation’s stability. Laboratory studies of upper bit device model showed that the amplitude of drum oscillations depends on the shaft rotation frequency, spring stiffness, and drum inertia moment. To determine the dimensions of working channels and drum openings of a upper bit device, the analysis of slurry samples from directional and horizontal wells was carried out. Designs of a slurry grinder for drilling wells with cone bits with diameters of 146 and 215.9 mm have been developed. Field tests showed that the use of the developed design of near-bit sludge grinder allows to increase the mechanical speed by 18% compared to the conventional method of drilling.