Unlock instant, AI-driven research and patent intelligence for your innovation.

Riser tensioner with shrouded rods

a technology of tensioner rod and rod body, which is applied in the direction of drilling casings, drilling pipes, constructions, etc., can solve the problems of affecting the stability affecting the sealing of the piston assembly, and causing reactive tensioning

Inactive Publication Date: 2005-07-07
VETCO GRAY
View PDF7 Cites 56 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This arrangement can have stability problems, especially when one of the piston assemblies fails.
Therefore, drippings and debris from above often fall onto the piston rods which can damage the seals of the piston assembly.
Failure and less reactive tensioning can occur when the seals are damaged.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Riser tensioner with shrouded rods
  • Riser tensioner with shrouded rods
  • Riser tensioner with shrouded rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Referring to FIGS. 1 and 2, a floating platform deck 11 is schematically shown. Deck 11 may, for example, be a deck of a barge, a tension leg platform, a spar or other types. However, the arrangement of FIG. 1 is particularly suited for a spar. Deck 11 has an opening 13 through which a riser 15 extends.

[0020] Riser 15 is connected on its lower end to a subsea well. In this embodiment, riser 15 is a production riser. Typically, a production tree (not shown) is mounted to the upper end of riser 15. Well fluids flow from the subsea wellhead of production riser 15 to the tree. Typically, the floating platform will support a number of risers 15.

[0021] A tensioner assembly comprising a plurality of hydro / pneumatic cylinder assemblies 17 supplies tension to each riser 15 as deck 11 moves upward and downward. Two cylinder assemblies 17 are shown in FIG. 1, but preferably, at least two more cylinder assemblies 17 will provide tension to each riser 15. Each cylinder assembly 17 inclu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A surface assembly that communicates with subsea structures and includes a working deck on a floating structure. The working deck has an aperture extending axially therethrough. A riser extends from a subsea location to the working deck and through the aperture. The surface assembly includes a frame extending circumferentially around the riser so that the frame moves axially with the riser. The assembly also includes a tensioner assembly connected between the working deck and the frame. The tensioner assembly has a piston, a piston chamber, and a piston rod extending from the piston and away from the piston chamber. A shroud encloses and moves in unison with the piston rod.

Description

RELATED APPLICATIONS [0001] This nonprovisional patent application claims the benefit of co-pending, provisional patent application U.S. Ser. No. 60 / 534,831, filed on Jan. 7, 2004, which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates in general to hydro / pneumatic tensioners for applying tension to a riser supported from a floating platform. [0004] 2. Background of the Invention [0005] An offshore facility includes a riser extending to a subsea facility such as a subsea well or subsea manifold located at the sea floor. Offshore facilities that float, such as a tension leg platform, move up and down and horizontally relative to the subsea well with the oscillations of the waves and currents. It is often desirous to maintain a desired tension on the riser during these oscillating movements. Tensioners are often utilized in order to react to the movements of offshore facilities moving with th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E02D5/62E21B17/01E21B19/00E21B19/09
CPCE21B19/006E21B19/09
Inventor PALLINI, JOSEPH W.MCCARTY, JEFFREY K.JENNINGS, CHARLES EDWARD
Owner VETCO GRAY