Corey E Hoffman, Age 637411 County Road 204, Plantersville, TX 77363

6405803, Jun 18, 2002

Apr 14, 2000

09/549785

Richard Lee Giroux - Katy TX
Corey E. Hoffman - Magnolia TX

Weatherford/Lamb, Inc. - Houston TX

E21B 3410

166374, 166319, 166321, 137 14, 137509

A downhole differential flow control valve is provided that utilizes a differential pressure area having one pressure area on which the wellbore pressure acts and a second area different from the first area on which pressure in the tubing acts. The differential area reduces the load in which the spring is required to exert a closing force in the valve. Thus, a coil spring can be used to improve the closing speeds of the valve.

6427776, Aug 6, 2002

Mar 27, 2000

09/536937

Corey E. Hoffman - Magnolia TX
Richard Lee Giroux - Katy TX
Mike A. Luke - Houston TX
Stephen J. Norris - League City TX

Weatherford/Lamb, Inc. - Houston TX

E21B 3708

166311, 166 99, 166222, 166167

The present invention provides a simple debris removal apparatus for use in a wellbore. In one aspect of the invention a modular, interchangeable venturi is provided which can be retrofit into an existing debris bailer having a filter and a debris collection container. In another aspect of the invention, a venturi is utilized to create a negative pressure in a wellbore sufficient to actuate a retrieval tool for a downhole device. In yet another aspect of the invention, a combination tool is provided which can evacuate debris in a wellbore, thereby uncovering a downhole device which can then be removed in a single trip. In yet another aspect of the invention, a debris removal apparatus is provided with a method for utilizing the apparatus in a wellbore on coiled tubing.

6568475, May 27, 2003

Jun 30, 2000

09/608077

William A. Grubb - Houston TX
David M. Haugen - League City TX
Corey E. Hoffman - Magnolia TX

Weatherford/Lamb, Inc. - Houston TX

E21B 4316

1663051, 4174101

An isolation container designed for use with a downhole electric pump assembly commonly used in oil and gas drilling and production operations is disclosed. The isolation container has an annular housing with an axial inlet and outlet bore. A downhole electric pump assembly is centrally located within the pressure isolation container. The downhole electric pump assembly includes an electric pump positioned above and coupled to a motor seal section which is positioned above and coupled to a centrifugal pump, thereby providing a means to power the centrifugal pump. A blind coupling is positioned above the electric motor with a tubular member connected thereto and extending through the inlet of the isolation container. The tubular member connects to a tubing string supplying fluid from the surface. The blind coupling has a plurality of radially disposed ports to allow pressurized fluid from the surface to flow into the annulus between the downhole electric pump and the isolation container.

6640904, Nov 4, 2003

Jun 6, 2002

10/163814

Corey E. Hoffman - Magnolia TX
Richard Lee Giroux - Katy TX
Mike A. Luke - Houston TX
Stephen J. Norris - League City TX

Weatherford/Lamb, Inc. - Houston TX

E21B 3120

166381, 166 99, 166167, 166222

A simple debris removal apparatus for use in a wellbore. In one aspect of the invention a modular, interchangeable venturi is provided which can be retrofit into an existing debris bailer having a filter and a debris collection container. In another aspect of the invention, a venturi is utilized to create a negative pressure in a wellbore sufficient to actuate a retrieval tool for a downhole device. In yet another aspect of the invention, a combination tool is provided which can evacuate debris in a wellbore, thereby uncovering a downhole device which can then be removed in a single trip. In yet another aspect of the invention, a debris removal apparatus is provided with a method for utilizing the apparatus in a wellbore on coiled tubing.

6668930, Dec 30, 2003

Mar 26, 2002

10/106178

Corey E. Hoffman - Magnolia TX

Weatherford/Lamb, Inc. - Houston TX

E21B 2900

166298, 166380, 166297, 166207, 166 558

The present invention provides methods for expanding coiled tubing within a wellbore in order to form a patch. In one aspect, an expansion assembly is run into the wellbore at the lower end of a string of coiled tubing. The expansion assembly includes a cutting tool and an expander tool. The coiled tubing is run into the wellbore such that the expander tool is adjacent a portion of surrounding casing or other tubular body to be patched. The expander tool is actuated so as to expand a selected portion of the coiled tubing into frictional engagement with the surrounding casing, thereby forming a patch within the wellbore. The cutting tool is actuated so as to sever the coiled tubing downhole above the patch. The severed coiled tubing is then pulled, thereby removing the expansion assembly from the wellbore as well.

6695057, Feb 24, 2004

Feb 11, 2002

10/073685

Gary D. Ingram - Richmond TX
Corey E. Hoffman - Magnolia TX
Richard L. Giroux - Cypress TX

Weatherford/Lamb, Inc. - Houston TX

E21B 4325

166308, 166185

A collar for injecting fluid, such as a formation treating fluid, into a wellbore, and a method for using same. The collar is disposed between the upper and lower packing elements of a pack-off system during the treatment of an area of interest within a wellbore. The collar first comprises an inner mandrel running essentially the length of the collar. The inner bore of the collar is in fluid communication with the annular region between the collar and the surrounding perforated casing by a set of actuation ports. A second set of ports, known as frac ports, is disposed within the mandrel. In accordance with one aspect of the invention, the collar further comprises a tubular case which substantially seals the frac ports in a first position, and slidably moves along the outer surface of the mandrel in order to expose the frac ports in a second position. In operation, the upper and lower packing elements are set at a first fluid pressure level. Upon application of a second greater fluid pressure level, the upper and lower packing elements are further separated in accordance with a designed stroke length, thereby exposing the frac ports.

6719056, Apr 13, 2004

Mar 14, 2003

10/388869

Corey E. Hoffman - Magnolia TX
Richard Lee Giroux - Katy TX
Mike A. Luke - Houston TX
Stephen J. Norris - League City TX

Weatherford/Lamb, Inc. - Houston TX

E21B 3700

166312, 166301

The present invention provides a simple debris removal apparatus for use in a wellbore. In one aspect of the invention a modular, interchangeable venturi is provided which can be retrofit into an existing debris bailer having a filter and a debris collection container. In another aspect of the invention, a venturi is utilized to create a negative pressure in a wellbore sufficient to actuate a retrieval tool for a downhole device. In yet another aspect of the invention, a combination tool is provided which can evacuate debris in a wellbore, thereby uncovering a downhole device which can then be removed in a single trip. In yet another aspect of the invention, a debris removal apparatus is provided with a method for the apparatus in a wellbore on coiled tubing.

6736214, May 18, 2004

Mar 27, 2001

09/819013

Corey E. Hoffman - Magnolia TX
Paul Wilson - Houston TX
Jason Ellis - Houston TX

Weatherford/Lamb, Inc. - Houston TX

E21B 3312

166387, 166374, 166120, 166125, 166182

The invention provides a running tool for a wellbore component. In one aspect, the tool includes a body having a longitudinal bore therethrough with an upper end for connection to a tubular run-in string and a selective attachment assembly for a wellbore component therebelow. A flow directing member is disposed in the bore and is movable between a first and second position. At a predetermined flow rate through the member, the member moves to the second position and directs fluid towards the selective attachment assembly, thereby causing the running tool to become disengaged from the wellbore component after the wellbore component has been actuated and fixed in the wellbore.