US 11,053,756 B2
Torque-dependent oscillation of a dual-pipe inner pipe section
Greg L. Slaughter, Jr., Perry, OK (US); Aleksander S. Wolfe, Stillwater, OK (US); and Kyle D. James, Perry, OK (US)
Assigned to The Charles Machine Works, Inc., Perry, OK (US)
Filed by The Charles Machine Works, Inc., Perry, OK (US)
Filed on Mar. 12, 2019, as Appl. No. 16/299,903.
Claims priority of provisional application 62/641,572, filed on Mar. 12, 2018.
Prior Publication US 2019/0277099 A1, Sep. 12, 2019
Int. Cl. E21B 19/16 (2006.01); E21B 7/04 (2006.01)
CPC E21B 19/166 (2013.01) [E21B 7/046 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for adding a pipe section to a drill string, the pipe section comprising an inner pipe section and an outer pipe section, the drill string comprising an inner pipe string and an outer pipe string, the method comprising the steps of:
attaching the pipe section to a carriage, the carriage adapted to advance and rotate the pipe section;
aligning an end of the inner pipe section with an end of the inner pipe string;
advancing the end of the inner pipe section towards the end of the inner pipe string;
rotating the inner pipe section in a first direction until the inner pipe section applies a first torque to the inner pipe string;
measuring a magnitude of the first torque;
if the measured magnitude of the first torque exceeds a predetermined threshold value, rotating the inner pipe section in a second direction opposed to the first direction;
continuing to rotate the inner pipe section in the second direction until the inner pipe section applies a second torque to the inner pipe string;
measuring a magnitude of the second torque;
aligning an end of the outer pipe section with an end of the outer pipe string;
advancing the end of the outer pipe section towards the end of the outer pipe string;
rotating the outer pipe section in a third direction until the outer pipe section applies a third torque to the outer pipe string; and
measuring a magnitude of the third torque.