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:
Feb. 13, 2007
Filed:
Sep. 09, 2004
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Harald Grimmer, Lachendorf, DE;
Roger Fincher, Conroe, TX (US);
Larry Watkins, Houston, TX (US);
Peter Aronstam, Houston, TX (US);
Peter Fontana, The Woodlands, TX (US);
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Harald Grimmer, Lachendorf, DE;
Roger Fincher, Conroe, TX (US);
Larry Watkins, Houston, TX (US);
Peter Aronstam, Houston, TX (US);
Peter Fontana, The Woodlands, TX (US);
Baker hughes Incorporated, Houston, TX (US);
Abstract
Methods and control systems are provided for a wellbore drilling system having an active differential pressure device (APD device) in fluid communication with a returning fluid. The APD Device creates a differential pressure across the device, which reduces the pressure below or downhole of the device. In embodiments, a control unit controls the APD Device to provide a selected pressure differential at a wellbore bottom, adjacent a casing shoe, in an intermediate wellbore location, or in a casing. In one arrangement, the control system is pre-set at the surface such that the APD Device provides a substantially constant pressure differential. In other arrangements, the control system measures one or more parameters (e.g., wellbore pressure, formation parameters, BHA parameters, etc.) and adjusts an operating parameter of the APD Device to provide a desired pressure differential. Devices such as an adjustable bypass can be used to control the APD Device.