The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2012
Filed:
May. 26, 2011
James R. Lovorn, Tomball, TX (US);
Saad Saeed, Houston, TX (US);
Nancy Davis, Arlington, TX (US);
Halliburton Energy Services, Inc., Houston, TX (US);
Abstract
A method of controlling pressure in a wellbore can include determining a real time wellbore pressure Pwbat a pressure sensor in the wellbore, calculating hydrostatic pressure Phat the pressure sensor, determining a real time annulus pressure Pa, calculating friction pressure Pf due at least to circulation of the fluid through the wellbore and depth in the wellbore, calculating a friction pressure correction factor CFequal to (Pwb−Ph−Pa)/Pf, and controlling operation of a pressure control device, based on the friction pressure correction factor CF. The method can further include determining a desired wellbore pressure Pwbat the pressure sensor, calculating an annulus pressure setpoint Paequal to Pwb−Ph−(Pf*CF, and adjusting the pressure control device as needed to maintain Paequal to Pa.