Subsea wellhead with annulus communicating system

Patent · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7017365

Hynes, J H

This patent describes a subsea wellhead. It comprises: a wellhead housing having an interior surface, an upper surface and a landing seat at the lower end of the inner surface, a series of hangers landed within the wellhead housing, each of the hangers having an exterior sealing surface and a series of seal assemblies having a seal for sealing between the exterior sealing surface of a hanger and the interior surface of the wellhead housing. The sealing of the seal assemblies providing a plurality of annuli between the hangers and the wellhead housing, a plurality of passages in the wellhead housing communicating from the upper surface of the wellhead housing to the annuli with each of the passages communicating with a single one of the annuli, means associated with the passages for isolating the annuli from each other and to prevent flow from one annulus into another, and means for communicating fluid pressure changes at the upper surface of the wellhead housing to the surface.

• Assignee: Cameron Iron Works USA, Inc., Houston, TX
• Patent Number(s): US 4887672
• Application Number: PPN: US 7-285585A
• OSTI ID: 7017365
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
423000 -- Engineering-- Marine Engineering-- (1980-)
DESIGN
MECHANICAL STRUCTURES
NATURAL GAS WELLS
OFFSHORE PLATFORMS
OIL WELLS
SEALS
SUPPORTS
UNDERWATER FACILITIES
WELLHEADS
WELLS