Drill  collaris a component of a drill string that provides weight on bit fordrilling. Thiskind of trenchless tool is a thick-walled tubular piece that  is machined from a solid bar of steel,usually plain carbon steel but sometimes ofnonmagnetic nickel-copper alloy orother nonmagnetic premium alloys. The solidbar is quenched and tempered toobtain the required mechanical properties, thentrepanned, drifted and threaded.Located at the bottom of the drill string,drill collar is a major component ofbottom hole assembly. The maincharacteristic of this trenchless tool is thickwall (It is generally between38 mm to 53 mm and is equivalent to 4 to 6 timesof that of drill pipe), largergravity and stiffness.

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