David J Power

US Patent:

7059427, Jun 13, 2006

Filed:

Sep 17, 2003

Appl. No.:

10/667296

Inventors:

David J. Power - Stafford TX, US
Gerhard P. Glaser - Houston TX, US

Assignee:

Noble Drilling Services Inc. - Sugar Land TX

International Classification:

E21B 3/06
E21B 44/00

US Classification:

175 27, 175 48

Abstract:

An automatic drilling system is disclosed which includes an electric servo motor operatively coupled to a winch brake control, a servo controller operatively coupled to the servo motor, and a drum position encoder rotationally coupled to a winch drum. The controller is adapted to operate the servo motor in response to measurements of position made by the encoder so that a selected rate of rotation of the drum is maintained.

US Patent:

20030008778, Jan 9, 2003

Filed:

May 20, 2002

Appl. No.:

10/151260

Inventors:

Robert Donaldson - Houston TX, US
Jimmie Lawson - Houston TX, US
David Power - Houston TX, US
Lewis Norman - Duncan OK, US

International Classification:

C09K007/00

US Classification:

507/100000

Abstract:

Permeable subterranean underground formations and fractures can be sealed using lost circulating material fluids having borate and metallic crosslinked polysaccharide gels that are crosslink in the well bore. Compositions and methods are illustrated whereby lost circulation material solids can be mixed in a mixing tank on the surface with a crosslinkable polysaccharide and a crosslinking agent under conditions whereby the lost circulating material fluid can be pumped into the well bore before undergoing gelation. Once the lost circulation material fluid equilibrates to the reservoir temperature the polysaccharide component of the lost circulation material fluid will crosslink.

US Patent:

62342509, May 22, 2001

Filed:

Jul 23, 1999

Appl. No.:

9/360866

Inventors:

Matthew Daryl Green - Houston TX
David Power - Houston TX
Jae Song - Houston TX

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

E21B 4700

US Classification:

16625003

Abstract:

A system is provided for monitoring in the real time the wellbore pit volume to promptly determine the occurrence of a wellbore kick and take corrective action to minimize fluid influx volume and/or drilling fluid losses. A system includes one or more level sensors 22 which output signals to a pit volume totalizer 20 and then to a computer 26. Computer 26 may also receive signals from one or more fluid temperature sensors 40 and one or more fluid compressibility sensors 42. The output from the computer may be displayed in real time in various monitors 28, then also may be output to a permanent record 30. Computer 36 may also automatically activate the conventional alarm 32 to alert the drilling operator to the occurrence of a kick. Substantial savings in drilling time and cost may be realized according to the present invention, along with benefits of reduced environmental contamination and enhanced well safety.