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Method and apparatus for controlling bottom hole pressure in a subterranean formation during rig pump operation

  • US 9,435,162 B2
  • Filed: 04/16/2013
  • Issued: 09/06/2016
  • Est. Priority Date: 10/23/2006
  • Status: Active Grant
First Claim
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1. A method for maintaining pressure in a wellbore during drilling operations comprising:

  • feeding a drill fluid through a reservoir conduit from a reservoir;

    diverting the drill fluid from the reservoir conduit to a first drill fluid line and through a drill string;

    circulating the drill, fluid through, the drill string to an annulus between the drill string and the wellbore wherein the drill fluid exits the annulus as a return fluid;

    directing the drill fluid from the reservoir conduit to a second drill fluid line and through a backpressure pump;

    mixing the return fluid with the drill fluid fed through the backpressure pump from the reservoir conduit to form a mixed fluid; and

    feeding the mixed fluid to a controllable choke for applying backpressure to the annulus.

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