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Realtime control of a drilling system using the output from combination of an earth model and a drilling process model

  • US 6,968,909 B2
  • Filed: 02/11/2003
  • Issued: 11/29/2005
  • Est. Priority Date: 03/06/2002
  • Status: Expired due to Term
First Claim
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1. A method for controlling a downhole operation, comprising:

  • constructing a drilling process model to represent an interaction of downhole conditions with an operation of a drillstring;

    obtaining a plurality of downhole drilling condition measurements during the downhole operation;

    updating the drilling process model based on the downhole drilling condition measurements;

    determining a plurality of optimum drilling parameter based on the updated drilling process model;

    informing a surface equipment control system of the optimum drilling parameters;

    iteratively repeating the steps of obtaining, updating, determining and informing during the downhole operation;

    determining a drilling mode; and

    executing a control sequence script based on the drilling mode.

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