Method and apparatus for erecting a drilling rig mast

摘要

A method and apparatus for erecting a drilling rig mast. The foot of a drilling rig mast is pinned to the base of a substructure. A traveling block is strung with a crown block at the top of the mast and the traveling block is secured to the substructure. A drawworks mounted on the substructure reels in traveling block line thus pivoting the end of the mast upwardly. The foot of the mast is unpinned and raised to the top of the substructure where it is pinned in a shoe. The drawworks reels in additional cable thus pivoting the mast into an upright position at which point it is secured for drilling or other operations.