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Formation testing in managed pressure drilling

  • US 9,759,064 B2
  • Filed: 06/09/2014
  • Issued: 09/12/2017
  • Est. Priority Date: 07/12/2011
  • Status: Active Grant
First Claim
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1. A method of testing an earth formation, comprising:

  • circulating a drilling fluid in a wellbore formed in the earth formation;

    ceasing circulation of the drilling fluid;

    then incrementally opening a choke while drilling into the earth formation and circulation of the drilling fluid are ceased, thereby reducing pressure in the wellbore;

    detecting an influx in the wellbore due to the reducing pressure in the wellbore;

    verifying the pressure in the wellbore with a pressure sensor in the wellbore; and

    wherein incrementally opening the choke is performed multiple times and ceases when the influx is detected.

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