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Calculating Downhole Card in Deviated Wellbore Using Parameterized Segment Calculations

  • US 20170152737A1
  • Filed: 11/28/2016
  • Published: 06/01/2017
  • Est. Priority Date: 11/30/2015
  • Status: Active Grant
First Claim
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1. A method of diagnosing a pump apparatus having a downhole pump disposed in tubing of a deviated wellbore, the downhole pump reciprocated in the tubing by a rod string operatively moved by an actuator at surface of the deviated wellbore, the method comprising:

  • obtaining surface data indicative of surface load and surface position of the rod string at the surface;

    calculating downhole data from the surface data by solving a wave equation having viscous damping and Coulomb friction factors;

    accounting for a mechanical friction factor between the rod string and the tubing in the calculation of the downhole data by;

    parameterizing segments of the deviated wellbore;

    mapping the rod string to the parameterized segments;

    computing forces experienced by the mapped rod string during operation relative to the parameterized segments using force equations characterized for pulling out and running in the mapped rod string in the parameterized segments, andusing the computed forces in the solution of the wave equation to calculate the downhole data; and

    generating information from the downhole data representative of downhole load relative to downhole position of the downhole pump.

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