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Method and system for controlling well fluid circulation rate

  • US 6,755,261 B2
  • Filed: 03/07/2002
  • Issued: 06/29/2004
  • Est. Priority Date: 03/07/2002
  • Status: Expired due to Fees
First Claim
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1. A method of varying fluid pressure in a circulation system while circulating a kick out of a well, the circulation system including a well bore drilled through a subterranean formation using a drilling rig, a drill string having a through bore and positioned at least partially within the well bore, a fluid pump for pumping a fluid through the drill string and into the well bore, and a drilling fluid choke in fluid communication with an annulus of the well bore, the method comprising:

  • pumping the fluid through the drill string, then through the well bore annulus and substantially back to the drilling rig, the fluid being pumped at a desired high fluid circulation rate;

    monitoring a plurality of sensors for monitoring conditions of the circulation system while pumping the fluid; and

    automatically reducing the fluid circulation rate to a predetermined reduced circulation rate in response to the monitored conditions, and the predetermined reduced circulation rate is the lowest reduced circulation rate for any of the monitored conditions.

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