David Archibald Macfarlane

US Patent:

6640902, Nov 4, 2003

Filed:

Apr 17, 2002

Appl. No.:

10/124919

Inventors:

Robert B. Baten - Houston TX
Harold B. Skeels - Kingwood TX
David MacFarlane - Houston TX
Russell E. McBeth - The Woodlands TX
Randy J. Wester - Spring TX
Marcus A. Smedley - Mesquite TX

Assignee:

FMC Technologies, Inc. - Chicago IL

International Classification:

E21B 2912

US Classification:

166368, 166338, 166344, 166 881, 166 891

Abstract:

A wellhead system for petroleum producing wells comprises a âstack-downâ casing hanger configuration. In this stack-down system, the hanger for each successively smaller diameter casing string is landed or ânestedâ within the hanger for the next larger casing string. This approach allows the pack-off for each casing hanger to be retrieved independently, thus allowing fluid communication to be established with any of the casing annuli after all of the casing strings and hangers have been installed. Thus the pressure in each annulus may be monitored while the well is in production mode.