Patent ID: 9115551
Filing Date: 2015-08-25
Classification: E21B

Abstract:
1. A reaming shell for mining, of the type having a shank having an axially forward end and an axially rearward end, and a plurality of pads attached at circumferential intervals from each other to extend lengthwise on an outer periphery of the shank, the reaming shell being configured for coupling at its axially forward end to a core bit of a diamond drilling tool for mining, wherein the reaming shell comprises a water groove between an adjacent pair of the pads, the water groove extending axially from a leading edge along a length of the shank, and wherein the water groove has an axially forward portion having a depth with a negative (−) sloped angle, which becomes deeper going from an axially forward end of the axially forward portion toward a rearward end of the axial forward portion, a middle portion that is substantially flat, and an axially rearward portion having a depth with a positive (+) sloped angle, which becomes shallower going from an axially forward end of the axially rearward portion to an axially rearward end of the axially rearward portion.