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Riser weak link

A joint, riser section technology, used in drill pipe, casing, wellbore/well components, etc.

Active Publication Date: 2014-09-24
DEN NORSKE STATS OLJESELSKAP AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Motion compensating means should be locked during the start of downward motion of the flotation unit or vessel, known solutions do not provide protection against compressive forces to the riser

Method used

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Examples

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Embodiment Construction

[0070] figure 1 A schematic view of a riser provided with a weak link according to the invention is shown. Risers 11 are typically used to connect oil and gas wells on the sea floor 12 to floating installations or vessels 13 on the surface 14, such as oil rigs or ships. On the seabed 12 the riser is connected to a subsea test tree 15 via a weak link 16 according to the invention. The standpipe 11 consists of pipe sections and is very heavy. Consequently, the surface vessel 13 must exert a tensile force on the riser 11 to prevent it from collapsing under its own weight. However, in certain sea conditions, such as when the vessel is moving, the applied tensile force will fluctuate. When the riser is fixed at its lower end to the subsea test tree 15 on the seabed and at its upper end to the floating installation or vessel 13 by means of tensioners, the movements of the installation caused by wind, wave and tidal action must be accommodated. Therefore, a motion compensating de...

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Abstract

The invention relates to a riser weak link in a riser connecting a floating installation or vessel to a hydrocarbon well on the seabed, said weak link comprising a first riser part (71) in the form of an upper housing (73) for connecting to a riser upper section (74); a second riser part (72) in the form of a lower housing (75) for connecting to a riser lower section (76), wherein one riser part is arranged to extend into the other riser part; and connection devices for releasably connecting the upper and lower housings (73, 75). The weak link comprises a first connection device (81) arranged to fail if a tensile force on the first and second riser parts (71, 72) exceeds a first threshold force, and that the weak link comprises a second connection device (82) arranged to fail if a compressive force on the first and second riser parts (71, 72) exceeds a second threshold force.

Description

technical field [0001] The present invention relates to riser weak links in risers connecting floating installations or vessels to oil and gas wells on the seabed. Background technique [0002] Risers are commonly used to connect oil and gas wells on the sea floor to floating installations or vessels such as oil rigs or ships. Risers are made of pipe sections and are very heavy. Therefore, surface vessels must apply tension to the riser to keep it from collapsing under its own weight. However, in certain sea conditions, such as when the vessel is moving, the applied tensile force will fluctuate. When the riser is fixed at its lower end to a wellhead on the seabed and at its upper end to a floating installation or vessel via a tensioner, it is necessary to accommodate the movement of the installation caused by wind, wave and tidal action. Therefore, motion compensating means must be incorporated into the tensioning system to hold the top of the riser in the moonpool of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/01
CPCE21B17/01E21B41/0007
Inventor C·A·江谢马
Owner DEN NORSKE STATS OLJESELSKAP AS
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