Patent ID: 11891864
Assignee: NATIONAL OILWELL VARCO, L.P.
Field: Handling (Mechanical engineering)
Classification: CPC E  B | IPC B  E

Claim 13:
14. A method of handling drill collar for use in a drilling operation, the method comprising:
engaging a box end of a collar stand with a pipe engaging element of a lift arm;
hoisting the collar stand using the lift arm, the lift ann comprising:
a boom secured to a mast at a pivotable coupling, arranged at a first end of the boom, and at a location above a racking board, the boom extending laterally, relative to the mast, from the first end to a second end; wherein the pipe engaging element is coupled to the boom at the second end and configured to engage with the box end of the collar stand; and
a lift line configured to raise and lower the pipe engaging element along the mast to lift and carry the collar stand, wherein the pivotable coupling is configured to allow the boom to pivot about a vertical axis generally parallel to the mast;
pivotin the second end of the boom about the pivotable coupling to move the hoisted collar stand between a position at well center and a position in a setback area;
using a first pipe handler, manipulating a first end of the collar stand; and
using a second pipe handler, manipulating a second end of the collar stand.