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:
Oct. 05, 2010
Filed:
Jun. 16, 2006
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Peter Aronstam, Houston, TX (US);
Harald Grimmer, Lachendorf, DE;
Roger W. Fincher, Conroe, TX (US);
Larry A. Watkins, Houston, TX (US);
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Peter Aronstam, Houston, TX (US);
Harald Grimmer, Lachendorf, DE;
Roger W. Fincher, Conroe, TX (US);
Larry A. Watkins, Houston, TX (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
An APD Device provides a pressure differential in a wellbore to control dynamic pressure loss while drilling fluid is continuously circulated in the wellbore. A continuous circulation system circulates fluid both during drilling of the wellbore and when the drilling is stopped. Operating the APD Device allows wellbore pressure control during continuous circulation without substantially changing density of the fluid. The APD Device can maintain wellbore pressure below the combined pressure caused by weight of the fluid and pressure losses created due to circulation of the fluid in the wellbore, maintain the wellbore at or near a balanced pressure condition, maintain the wellbore at an underbalanced condition, reduce the swab effect in the wellbore, and/or reduce the surge effect in the wellbore. A flow restriction device that creates a backpressure in the wellbore annulus provides surface control of wellbore pressure.