Riser pipe construction and module therefor
AssigneesAdviesbureau H. Van Der Poel, Buitendijk Holding B.V.
InventorHans van der Poel
Life of this patent
Estimating the term…
Abstract
A riser pipe construction for a drilling connection from a drilling vessel to a valve previously provided on a sea floor comprises a riser pipe through which drilling means can be passed by means of which an oil well can be drilled as well as pressure pipes extending along the riser pipe to operate the valve, and floating elements disposed around the riser pipe and the pressure pipes to limit the load on the drilling vessel. The riser pipe and the pressure pipes are built up from modules capable of being coupled together, the floating elements are formed by steel tubular chambers closed so as to be gastight, disposed around the relevant modules and firmly connected thereto. The invention also relates to a riser pipe module.
Claims13
A riser pipe construction for a drilling connection from a drilling vessel to a valve previously provided on a sea floor, comprising:
- a plurality of riser pipe modules coupled together forming a riser pipe through which drilling means can be passed by means of which an oil well can be drilled;
- a plurality of pressure pipe modules coupled together forming a pressure pipe extending parallel to the riser pipe to operate the valve, and
- a plurality of floating elements each formed by at least one steel tubular chamber closed so as to be gastight, each of the floating elements disposed around a portion of a corresponding riser pipe module and a portion of a corresponding pressure pipe module, the portion of the steel tubular chamber being firmly and permanently connected to the corresponding riser pipe module by means of plates, wherein the at least one steel tubular chamber is filled with a gaseous medium having an elevated pressure.
A module for a riser pipe construction comprising a riser pipe module, a pressure pipe module extending substantially parallel to the riser pipe module, and a floating element in the form of a steel tubular chamber closed so as to be gastight, the floating element disposed around a portion of the riser pipe module, the steel tubular chamber being firmly and permanently connected to the corresponding riser pipe module by means of plates, the tubular chamber being filled under elevated pressure with a gaseous medium.
Dependencies are inferred from the claim text.