David Dewitt Hearn

US Patent:

8256535, Sep 4, 2012

Filed:

Dec 10, 2009

Appl. No.:

12/635353

Inventors:

David D. Hearn - Houston TX, US
Lamar L. Gantt - Anchorage AK, US
Howard Gober - Eagle River AK, US

Assignee:

ConocoPhillips Company - Houston TX

International Classification:

E21B 7/04
E21B 7/08

US Classification:

175 61, 175 81, 175 62

Abstract:

A method and apparatus for forming a window in the wall of a tubular wellbore. In one embodiment described herein, a down hole apparatus for forming a window in the wall of a wellbore utilizing a plurality of tubing string sections and a thick tailpipe positioned at the down hole end of a tubing section.

US Patent:

8430187, Apr 30, 2013

Filed:

Feb 18, 2010

Appl. No.:

12/708266

Inventors:

David D. Hearn - Houston TX, US

Assignee:

ConocoPhillips Company - Houston TX

International Classification:

E21B 7/08
E21B 10/00

US Classification:

175 61, 175 75, 175376, 175398, 166 52, 1661175, 166313

Abstract:

Drilling a sidetrack wellbore out of the side of an existing wellbore utilizing a drillable billet having a path formed in the billet to lead a bi-centered drillbit to kick-out from the wellbore and form a sidetrack wellbore. The bi-centered bit is arranged for the lands of the pilot section to follow the path of the billet while the wings of the ream out a portion of the billet and also ream out the earth to form the full dimension sidetrack wellbore. The bi-centered bit is used to drill the sidetrack wellbore to the target zone so that the entire drilling process extends from the existing wellbore to the target zone without a mandatory withdrawal of the drillstring from the wellbore.

US Patent:

20100307736, Dec 9, 2010

Filed:

Jun 8, 2010

Appl. No.:

12/796370

Inventors:

David D. Hearn - Houston TX, US
Lamar L. Gantt - Anchorage AK, US
Dan E. Venhaus - Chugiak AK, US
John G. Eller - Anchorage AK, US

Assignee:

CONOCOPHILLIPS COMPANY - Houston TX

International Classification:

E21B 23/03
E21B 7/04

US Classification:

1661175, 175 61

Abstract:

The present invention relates to drilling lateral wells or sidetrack wells from a primary wellbore to enhance the efficiency and productivity of oil and gas wells.

US Patent:

44837216, Nov 20, 1984

Filed:

Dec 27, 1983

Appl. No.:

6/565262

Inventors:

David D. Hearn - Richardson TX

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

B23K 704

US Classification:

148 96

Abstract:

A method and apparatus for cutting a series of patterns spaced along the length of a tubular member (e. g. drill collar). A cutting torch is positioned and manuevered within the bore of the pipe so that all cutting is done in an inside-to-outside direction. All slag formed by the cutting action is blown away from the pipe and does not collect within the pipe bore as in previous cutting operations of this type. Further, since there is no cross-wash of the torch, there is no substantially no heat buildup in the pipe during cutting which allows proper preheating of the pipe thereby alleviating cold cuts in the pattern.

US Patent:

59441011, Aug 31, 1999

Filed:

Jun 15, 1998

Appl. No.:

9/094879

Inventors:

David D. Hearn - Anchorage AK

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

E21B 2906

US Classification:

1661175

Abstract:

An apparatus for milling a window in a well tubular, e. g. a well casing, which is comprised of a whipstock and a cooperating mill. The mill has a nose portion depending from the bottom thereof and has cutting surfaces on both the bottom and the sides. The whipstock is comprised of a body which, in turn, has a tapered surface along at least a portion of its length. A guide, e. g. cylindrical pipe, is mounted on and is spaced from the tapered surface and is adapted to receive the nose portion on the mill to provide a guide path for the mill as it cuts or mills a window in the well casing. The guide is positioned so as to direct the side cutting surface of the mill into contact with the casing without contacting the tapered surface of the whipstock.

US Patent:

57250600, Mar 10, 1998

Filed:

Mar 24, 1995

Appl. No.:

8/409246

Inventors:

Curtis G. Blount - Anchorage AK
Lamar L. Gantt - Anchorage AK
David D. Hearn - Anchorage AK
Gregory S. Walz - Anchorage AK

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

E21B 704

US Classification:

175 61

Abstract:

A mill starting device for use in a pipestring in a wellbore which provides an inclined wall for guiding the mill to a shoulder stop so that when the mill is operated it preferentially bites into the shoulder stop and a method for using the device together with coiled tubing for forming a window in a subsurface well conduit.

US Patent:

49132296, Apr 3, 1990

Filed:

May 13, 1988

Appl. No.:

7/193963

Inventors:

David D. Hearn - Richardson TX

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

E21B 3316
F16L 3708

US Classification:

166156

Abstract:

Connectors for connecting coilable tubing and other relatively thin walled tubing strings to downhole tools are provided which are releasable to permit withdrawal of the tubing without a member connected to the tubing that is substantially larger in diameter than the tubing itself. One embodiment of the connector includes a body member having plural collet fingers which are engagable with the tubing distal end through cooperating circumferential grooves and lands. The collet fingers are retained in gripping engagement with the tubing by a retainer sleeve having a piston head which catches a pump down ball to block a flow passage in the retainer and allow a fluid pressure force to shear plural shear screws which hold the retainer in the finger engaging position. Alternate embodiments includes recesses formed in the wall of the tubing for receiving ball keys which are held in registration with the recesses by the connector body and a cooperating slidable sleeve member.

US Patent:

60327375, Mar 7, 2000

Filed:

Apr 7, 1998

Appl. No.:

9/056272

Inventors:

Jerry L. Brady - Anchorage AK
Mark D. Stevenson - Anchorage AK
John M. Klein - Anchorage AK
James L. Cawvey - Anchorage AK
David D. Hearn - Anchorage AK

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

E21B 4338

US Classification:

166265

Abstract:

A method and system for increasing oil production from an oil well producing a mixture of oil and gas at an elevated pressure through a wellbore penetrating an oil-bearing formation containing an oil-bearing zone and an injection zone, by separating at least a portion of the gas from the mixture of oil and gas to produce a separated gas and an oil-enriched mixture; utilizing energy from at least a portion of the mixture of oil and gas to compress at a surface at least a portion of the separated gas to produce a compressed gas having sufficient pressure to be injected into the injection zone; injecting the compressed gas into the injection zone; and recovering at least a major portion of the oil-enriched mixture.