초록 ▼

A tool 60 for rotating a tubular member 80 passing through a slip assembly 66 is powered by a rotary table 62 of a drilling rig. Tool 60 includes a cam ring 8 having a plurality of interior camming surfaces 82 thereon, and a cage plate assembly 84 rotatable with respect to the cam ring 8 and housing

A tool 60 for rotating a tubular member 80 passing through a slip assembly 66 is powered by a rotary table 62 of a drilling rig. Tool 60 includes a cam ring 8 having a plurality of interior camming surfaces 82 thereon, and a cage plate assembly 84 rotatable with respect to the cam ring 8 and housing one or more gripping heads 94 for gripping engagement with the tubular 80. A powered drive unit 55 is provided for selectively rotating the cage plate assembly 84 with respect to the cam ring 8. A tool mount 10 removably connects the slip assembly and the cage plate assembly, and one or more axial adjustment members 17 permit limited axial movement of the cam ring 8 with respect to the slip assembly so that the gripping heads retain gripping engagement with the tubular member 80 while moving axially with respect to the body of the slip assembly.

대표청구항 ▼

[ What is claimed:] [1.] A method of rotating a tubular member while passing through a slip assembly and a powered rotary table of a drilling rig, the slip assembly including an outer body fixed with respect to the rotary table and a plurality of slips for gripping engagement with the tubular member

[ What is claimed:] [1.] A method of rotating a tubular member while passing through a slip assembly and a powered rotary table of a drilling rig, the slip assembly including an outer body fixed with respect to the rotary table and a plurality of slips for gripping engagement with the tubular member to prevent substantial inadvertent axial movement of the tubular member with respect to the rotary table, the method comprising:supporting a cam ring on the slip assembly, the cam ring having one or more interior camming surfaces thereon;rotating a cage plate assembly with respect to the cam ring to move one or more gripping heads radially into gripping engagement with the tubular member;positioning an axial adjustment member for allowing limited axial movement of the cage plate assembly with respect to the slip assembly body, such that the one or more gripping heads retain gripping engagement with the tubular member while moving axially with respect to the slip assembly body in response to limited axial movement of the plurality of slips with respect to the slip assembly body; androtating the rotary table and the cam ring interconnected therewith to rotate the tubular member.