Randolph J Sheffield

US Patent:

6439313, Aug 27, 2002

Filed:

Sep 20, 2000

Appl. No.:

09/666724

Inventors:

Hubertus V. Thomeer - Houston TX
James Michael Costley - Freeport TX
Randolph J. Sheffield - Missouri City TX
David M. Eslinger - Broken Arrow OK
Marc Allcorn - Houston TX
Mark C. Oettli - Richmond TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 2900

US Classification:

166361, 166298, 166376, 166 546, 166 558

Abstract:

A method of machining a workpiece in a subterranean wellbore comprises the steps of: (a) providing a workpiece that comprises (1) a first section that comprises a first material, and (2) a second section that comprises a second material, the second section forming at least one surface of the workpiece; (b) placing the workpiece in a subterranean wellbore that is surrounded by a geologic formation; and (c) machining the workpiece to remove at least part of the second material in the second section, whereby at least one surface of the workpiece is formed into a desired configuration. This method allows, for example, a landing nipple to be installed in a wellbore, and customized locking recesses to be formed in the inner surface of the nipple at a later time.

US Patent:

6533037, Mar 18, 2003

Filed:

Nov 29, 2000

Appl. No.:

09/725779

Inventors:

David M. Eslinger - Broken Arrow OK
Howard L. McGill - Lufkin TX
James M. Costley - Freeport TX
Randolph J. Sheffield - Missouri City TX
Warren M. Zemlak - Sugar Land TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 3410

US Classification:

166319, 166308, 1663321, 1661775

Abstract:

A tool string, such as one used for performing fracturing operations or other types of operations, includes a valve, a valve operator, and a sealing assembly that in one arrangement includes packers to define a sealed zone. The tool string is carried on a tubing, through which fluid flow may be pumped to the sealed zone. The valve operator is actuated in response to fluid flow above a predetermined flow rate. When the flow rate at greater than the predetermined flow rate does not exist, the valve operator remains in a first position that corresponds to the valve being open. However, in response to a fluid flow rate at greater than the predetermined flow rate, the valve operator is actuated to a second position to close the valve.

US Patent:

6655461, Dec 2, 2003

Filed:

Apr 1, 2002

Appl. No.:

10/113500

Inventors:

David M. Eslinger - Broken Arrow OK
Randolph J. Sheffield - Missouri City TX
Mark C. Oettli - Richmond TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 4316

US Classification:

1663051, 373387, 373191, 373186, 373202

Abstract:

A straddle packer tool for treatment of wells has a tool body supporting sealing elements in spaced relation for defining a sealed annulus zone within a wellbore. The tool body defines a treatment fluid passage having treatment ports that open to the sealed annulus zone for formation fracturing or other well treatment. The tool body has a bypass passage therethrough which is isolated from the treatment fluid passage and communicates with the wellbore above and below the sealed annulus zone. A check valve permits downward flow of well fluid from the bypass passage into the wellbore below the tool and prevents upward flow of fluid into the bypass passage. Bypass ports conduct fluid flow to and from the bypass passage and the wellbore above and below the sealed annulus zone. A packer actuated bypass valve is opened or closed to control the flow of well fluid within the bypass passage.

US Patent:

6668938, Dec 30, 2003

Filed:

Mar 13, 2002

Appl. No.:

10/098121

Inventors:

Randolph J. Sheffield - Missouri City TX
David M. Eslinger - Broken Arrow OK
Mark C. Oettli - Richmond TX
Jose F. Hurtado - Houston TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 33128

US Classification:

166387, 166202, 277335

Abstract:

An improved cup packer for use on wellbore tools is disclosed. The open end of the cup packer bore is filled with an elastomer to prevent the intrusion of sand and debris into the space between the cup packer and the wellbore tool on which it is mounted. In an alternative embodiment of the invention, the packer body includes an angularly protruding section at at least one of its ends, wherein the longitudinal dimension of the packer body is at its maximum at its bore. In an additional alternative embodiment of the invention, the open end of the packer is sealed by a screen to prevent the intrusion of sand and debris into the space between the cup packer and the wellbore tool on which it is mounted.

US Patent:

6776239, Aug 17, 2004

Filed:

Feb 19, 2002

Appl. No.:

10/078963

Inventors:

David M. Eslinger - Broken Arrow OK
Stephen D. Hill - Pearland TX
Randolph J. Sheffield - Missouri City TX
Howard L. McGill - Lufkin TX
James M. Costley - Freeport TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 2300

US Classification:

1663081, 166386, 1661775, 166240

Abstract:

A tubing conveyed multi-position well treating tool having a tubular housing and a tubular inner member which are relatively positionable at âSetâ, âTreatâ, âDumpâ and âReleaseâ positions actuated by a mechanical indexing mechanism. The indexing mechanism is loaded by a spring, such as a compressed gas spring or mechanical spring, which urges the tubular housing away from the tubing connection of the inner tubular member, thus requiring no set-down forces for tool actuation or indexing. The treating tool is anchored within the well casing by hydraulic pressure actuated buttons, thus eliminating the typical requirement for anchoring actuation by set-down forces. The treating tool is sealed within the casing by pressure energized packers which are activated by the hydraulic pressure of fluid supplied from the tubing. The tool provides a bypass passage to allow communication of the zones above and below the tool while isolating the straddled interval to be treated.

US Patent:

7273102, Sep 25, 2007

Filed:

May 28, 2004

Appl. No.:

10/709800

Inventors:

Randolph J. Sheffield - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugarland TX

International Classification:

E21B 43/119
E21B 47/12

US Classification:

166297, 166 55, 175 40, 3408532

Abstract:

A technique that is usable with a subterranean well includes communicating a wireless stimulus downhole in the well and actuating a casing conveyed tool in response to the communication.

US Patent:

7347271, Mar 25, 2008

Filed:

Jul 29, 2005

Appl. No.:

11/161342

Inventors:

Herve Ohmer - Houston TX, US
Klaus Huber - Sugar Land TX, US
Randolph J. Sheffield - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 3/00

US Classification:

166366, 324338, 3408546

Abstract:

A subsea communication system includes devices in a wellbore and devices on a floor, where the devices in the wellbore and on the floor are able to communicate wirelessly with each other, such as through a formation.

US Patent:

7348893, Mar 25, 2008

Filed:

Mar 11, 2005

Appl. No.:

11/077936

Inventors:

Songming Huang - Hardwick, GB
Franck Bruno Jean Monmont - Caldecote, GB
Robert W. Tennent - Lower Cambourne, GB
Randolph J. Sheffield - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 3/00

US Classification:

3408543, 3408855, 367 81

Abstract:

A technique that is usable with a well includes using at least one downhole sensor to establish telemetry within the well. The sensor(s) are used as a permanent sensing device.