Auxiliary subsurface compensator

US8931563B2 · kind B2 · utility

Assignee

• Aker Subsea AS · NO

Inventors

• Ole Jorgen Holtet · Oslo, NO
• Linn Therese Thuv · Oslo, NO
• Simen Ronne · Kongsberg, NO

Key dates

• Filing date: Dec 23, 2009
• Grant date: Jan 13, 2015
• Expiry date: Oct 19, 2031

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B17/06
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

Force-dampening arrangement (100) for dampening forces between two interconnectable parts in a tube string, of which interconnectable parts a lower part (101) is connected to the upper end of a string element (105, 3a) extending into a subsea well (5) and an upper part (103) is suspended from a floating surface installation (1) through at least one suspension element (3b) extending up to said surface installation. The force-dampening arrangement (100) is connected to the tube string above a string-portion (3a) extending into said subsea well, and below at least a portion of said suspension element (3b). The force dampening arrangement (100) exhibits an upper and lower section (109, 111) that are vertically movable in relation to each other, thereby yielding for impact forces between said interconnectable upper and lower parts (103, 101) resulting from vertical heave movement of said portion of suspension elements (3b) moving vertically in respect of the string element (3a).