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Device for handling and racking riser pipes and drill pipes

  • US 4,117,941 A
  • Filed: 03/25/1977
  • Issued: 10/03/1978
  • Est. Priority Date: 04/01/1976
  • Status: Expired due to Term
First Claim
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1. Device for handling and racking riser pipes in a driling derrick on a platform for drilling and/or production of oil wells on the bottom of the sea, said platform/drilling derrick comprising a drill floor and a cellar deck, characterized in that said device comprises a set back platform on the cellar deck for vertical racking of riser pipe stands in the drilling derrick, a first manipulator for displacement of a riser pipe stand'"'"'s lower end between a first position near the centre line of the drilling derrick and another position outside the center line, a second manipulator for displacement of a riser pipe stand'"'"'s lower end between the aforementioned other position and a position above the set back position on the cellar deck, an elevator in the drilling derrick for raising and lowering riser pipe stands, a finger-board in the drilling derrick intended for taking up handling subs on the riser pipe stands, locking members on the finger-board for securing the handling subs in the finger-board, a third manipulator for guiding and moving respectively a handling sub between a position near the centre line of the drilling derrick, in which position the handling sub can be coupled with the elevator, and a set back position in the finger-board.

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