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Method of conducting well operations from a moveable floating platform

  • US 4,972,907 A
  • Filed: 08/10/1987
  • Issued: 11/27/1990
  • Est. Priority Date: 10/24/1985
  • Status: Expired due to Term
First Claim
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1. A method of simultaneously conducting well operations at a first underwater well and a second underwater well from a moveable platform floating upon the surface of a body of water, said platform having;

  • well operations equipment thereon, andanchor cable length adjustment means carried by said platform and being operable to regulate the length and tension of anchor cables operatively engaged to said anchor cable length adjustment means, said anchor cables depending downward from said anchor cable length adjustment means through said body of water to discrete anchors arranged in an array at the bottom of said body of water, said platform thereby operatively connected to said anchors by said anchor cables and anchored in a first vertical position, said first vertical position defined by a substantially vertical relationship between said platform and an area defined within the perimeter formed by the anchors of said anchor array, said method of simultaneously conducting well operations at said first underwater well and said second underwater well including the steps of;

    operatively engaging a marine riser between said floating platform and well equipment disposed upon the bottom of said body of water positioned at said first underwater well located substantially beneath said floating platform,laterally displacing and bending a portion of said marine riser by moving said floating platform from said first vertical position to a second vertical position defined by a substantially vertical relationship between said platform and said second underwater well by adjusting the length of said anchor cables, andlowering well operations equipment means into contact with the bottom of said body of water at said second underwater well, said well operations equipment means operatively engaged to the lower end of conduit means that depend downwardly from said floating platform, the upper end of said conduit means operatively engaged to the lower end of conduit means that depend downwardly from said floating platform, the upper end of said conduit means operatively engaged to said floating platform.

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