Offset elevator for a pipe running tool and a method of using a pipe running tool

  • US 6,637,526 B2
  • Filed: 12/20/2001
  • Issued: 10/28/2003
  • Est. Priority Date: 03/05/1999
  • Status: Expired due to Term
First Claim
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1. A pipe running tool mountable on a rig for use in handling pipe segments and for engaging the pipe segments to a string of pipe, the pipe running tool comprising:

  • a top drive assembly adapted to be connected to the rig for vertical displacement of the top drive assembly relative to the rig, the top drive assembly including a drive shaft, the top drive assembly being operative to rotate the drive shaft; and

    a lower pipe engagement assembly including a central passageway sized for receipt of the pipe segment, the lower pipe engagement assembly including a powered pipe engaging mechanism that is selectively driven into a pipe engagement position to forcibly yet releasably engage the pipe segment and substantially prevent relative rotation therebetween, the powered pipe engaging mechanism comprising;

    a slip bowl defining a generally cylindrical central passageway, and a plurality of slips receivable within and movable relative to said slip bowl, wherein each of said plurality of slips has two vertically spaced outer camming surfaces which taper to a reduced diameter as they advance downwardly, and a recess extending radially inwardly vertically between said camming surfaces, the slip bowl having a vertically extending side wall with two vertically spaced camming surfaces formed at the inside thereof, which surfaces taper essentially in correspondence with the surfaces of the each of the plurality of slips and are engageable therewith in a lowered active position of the slip, the side wall of the slip bowl containing a recess vertically spaced between the two spaced camming surfaces of the bowl and into which a lower one of said two camming surfaces on each of the plurality of slips is movable in an upper retracted position such that the central passageway can accommodate a drillpipe tool joint, wherein the lower pipe engagement assembly is in communication with the drive shaft, whereby actuation of the top drive assembly causes the lower pipe engagement assembly to rotate.

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