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Elastic pipe control with managed pressure drilling

  • US 10,184,305 B2
  • Filed: 05/07/2014
  • Issued: 01/22/2019
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
First Claim
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1. A method comprising:

  • obtaining at least one fluid property of an input fluid to a well and of a return fluid from the well;

    calculating an elasticity parameter of a drill string within the well based at least in part on the at least one fluid property;

    calculating a wellhead setpoint pressure that results in a predetermined downhole pressure at a predetermined location in the well, the calculation based at least in part on the elasticity parameter and the at least one fluid property; and

    controllably regulating the flow of the return fluid to maintain the calculated wellhead setpoint pressure.

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