Rodolfo Z Lugo

US Patent:

52901262, Mar 1, 1994

Filed:

Dec 13, 1991

Appl. No.:

7/807543

Inventors:

James A. Gariepy - Cypress TX
Rodolfo Z. Lugo - Houston TX
B. Lee Danner - Houston TX

Assignee:

ABB VectoGray Inc. - Houston TX

International Classification:

E02D 574

US Classification:

405169

Abstract:

A subsea well assembly has an antirotation device to prevent rotation of an inner wellhead housing within an outer wellhead housing. A number of slots are formed in the upper rim of the outer wellhead housing. The slots have open upper ends. A number of pins are mounted to the exterior of the inner wellhead housing. Guide surfaces extend upward from the slots to guide the pins as the inner wellhead housing is lowered into the outer wellhead housing. The pins locate in the slots to prevent rotation.