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Systems And Methods For Modeling Drillstring Trajectories

  • US 20120116738A1
  • Filed: 07/10/2009
  • Published: 05/10/2012
  • Est. Priority Date: 07/10/2009
  • Status: Abandoned Application
First Claim
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1. A method for modeling a drillstring trajectory, comprising:

  • calculating an initial value of force and an initial value of moment for each joint along a drillstring model using a conventional torque-drag model, a tangent vector, a normal vector and a bi-normal vector for each respective joint;

    calculating a block tri-diagonal matrix for each connector on each joint; and

    modeling a drillstring trajectory by solving the block tri-diagonal matrix for two unknown rotations at each connector.

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