Riser for a great water depth
AssigneeInstitut Francais du Petrole
InventorJean Guesnon
Life of this patent
Estimating the term…
Abstract
A riser adapted to be immersed at a deep water level and including a main tube or an extension tube and peripheral lines. The riser includes at least two of an internal lining of an extension tube, a float only on the upper portion of the extension tube, and/or an extension tube and/or at least one of the peripheral lines having a weight less than that of an equivalent steel tube and/or of an equivalent steel line.
Claims12
A marine riser for installation in a body of water having a great depth, the riser comprising:
- a central tube means for transferring a fluid including mud from a bottom of the body of water to an upper level thereof;
- peripheral lines connected to said riser;
- an internal lining disposed in said central tube for reducing an amount of mud circulating in the riser;
- and
- a plurality of floats surrounding the central tube and being respectively disposed solely along an axial length of an upper section of the central tube,
- wherein said internal lining is disposed coaxially with respect to said central tube and has a diameter less than a diameter of said central tube so as to define an annular space between an outer surface of said internal lining and an inner surface of said central tube.
A marine riser for installation in a body of water having a great depth, the riser comprising:
- a central tube for transferring a fluid including mud from a bottom of the body of water to an upper level thereof,
- peripheral lines connected to said riser;
- an internal lining disposed in said central tube for reducing an amount of mud circulating in the riser, and
- float means provided solely along an axial length of an upper section of the central tube,
- wherein said internal lining is disposed coaxially with respect to said central tube and has a diameter less than a diameter of said central tube so as to define an annular space between an outer surface of said internal lining and an inner surface of said central tube, and
- wherein said riser is formed of a plurality of riser sections, and said internal lining is suspended from a corresponding interior lining of an adjacent riser section.
A marine riser for installation in a body of water having a great depth, the riser comprising:
- a central tube means for transferring a fluid including mud from the bottom of the body of water to an upper level thereof, peripheral lines connected to said riser, an internal lining means disposed in said central tube means for reducing an amount of mud circulating in the riser, wherein said internal lining means is disposed coaxially with respect to said central tube means and has a diameter less than a diameter of said central tube means so as to define an annular space between an outer surface of said internal lining means and an inner surface of said central tube means, and wherein at least one of said central tube means and at least one of said peripheral lines has a weight less than an equivalent steel tube or steel peripheral line.
Dependencies are inferred from the claim text.