Robert L Cuthbertson

US Patent:

6732804, May 11, 2004

Filed:

May 23, 2002

Appl. No.:

10/154437

Inventors:

David Hosie - Sugar Land TX
Ramkumar K Bansal - Houston TX
Robert L. Cuthbertson - Columbus TX

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

E21B 4312

US Classification:

166373, 166321, 166386, 175318

Abstract:

A method and an apparatus for a dynamic mudcap drilling and well control assembly is provided. In one embodiment, the apparatus comprises of a tubular body disposable in a well casing forming an outer annulus there between and an inner annulus formable between the body and a drill string disposed therein. The apparatus further includes a sealing member to seal the inner annulus at a location above a lower end of the tubular body and a pressure control member disposable in the inner annulus at a location above the lower end of the tubular body. In another embodiment, the assembly uses two rotating control heads, one at the top of the wellhead assembly in a conventional manner and a specially designed downhole unit. Finally, the assembly provides a method for allowing the well to produce hydrocarbons while tripping the drill string.

US Patent:

7686076, Mar 30, 2010

Filed:

Feb 22, 2006

Appl. No.:

11/359083

Inventors:

Patrick L. York - Katy TX, US
Robert L. Cuthbertson - Houston TX, US
Lev Ring - Houston TX, US

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

E21B 23/00

US Classification:

166207, 166206, 166317, 166318, 166380, 175 57, 175230, 175318

Abstract:

The present invention generally relates to methods and systems for mitigating trouble zones in a wellbore in a preferred pressure condition and completing the wellbore in the preferred pressure condition. In one aspect, a method of reinforcing a wellbore is provided. The method includes locating a valve member within the wellbore for opening and closing the wellbore. The method further includes establishing a preferred pressure condition within the wellbore and closing the valve member. The method also includes locating a tubular string having an expandable portion in the wellbore and opening the valve member. Additionally, the method includes moving the expandable portion through the opened valve member and expanding the expandable portion in the wellbore at a location below the valve member. In another aspect, a method of forming a wellbore is provided. In yet another aspect, a system for drilling a wellbore is provided.