a. A steel tube attached to the upper end of a core barrel and having the same outside diameter as the core barrel. The upper end is open except for two web members running from the inside of the tube to a ring encircling the drill rod. The calyx serves as a guide rod and also as a bucket to catch cuttings that are too heavy to be flushed out of the borehole by the circulation fluid. Syn: bucket; sludge barrel; sludge bucket. Long
b. Syn: shot drill
c. A pipe or tube equipped with a sawtooth cutting edge, sometimes used to obtain a core sample of a formation being drilled. CF: basket Long
d. In well drilling, a long cylindrical vessel that guides an annular toothed bit. Its action is like that of a diamond drill. A toothed cutter takes the place of a diamond crown and is rotated by hollow flushing rods with a strong constant flow of water. A core is cut, preserved in a core barrel, and brought to the surface. The drills are made large enough so that the holes are used as shafts. Hess e. See: sediment tube
Source:
Dictionary of Mining, Mineral, and Related Terms












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