EXTENDING THE LONGEVITY OF ROLLING CUTTER BITS

摘要

Analysis of failures in oil and gas equipment indicates that the rolling cutter is the weak link in drill bits. One of the causes of rolling-cutter breakdown is contortion of the balls and roller of the thrust bearings of the bit, which leads to a cleft in the rolling cutter. A design of rolling-cutter bit, which possesses extended longevity, has been developed at the Sarapul Polytechnic Institute (branch of the Izhevsk State Technical University). Lack of circulation of metal-blocking lubrication in the zone of contact between the hemispherical surfaces of the rolling cutter and shank is a deficiency of present devices.