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A method and a system for controlling movements of a free-hanging tubular

A hanging pipe, free technology, applied in the direction of drill pipe, casing, earth cube drilling and mining etc.

Active Publication Date: 2013-04-10
AKER MH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that there will be no ability to drop into the water as fast as the drilling rig

Method used

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  • A method and a system for controlling movements of a free-hanging tubular
  • A method and a system for controlling movements of a free-hanging tubular
  • A method and a system for controlling movements of a free-hanging tubular

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Embodiment Construction

[0039] figure 1 A drilling rig 2 is shown, which is buoyant in water and is normally loaded by water waves W, currents and wind. Free suspension riser 4 is suspended with rig 2 via compensator 7 . In the illustrated embodiment, a riser tensioner is used as the compensator. The expansion joint 5 allows relative movement between the riser and the drilling rig. Movement of the rig (eg, lifting) is shown with double arrows labeled H, while riser dynamics are shown with double arrows labeled R. therefore, figure 1The soft hang mode of the riser is shown.

[0040] will now refer to image 3 The compensating device 1 that controls the stiffness and response of each respective compensator 7 is described.

[0041] The compensator 7 comprises a housing connected to the rig 2, and a piston 24a with a piston rod 24b connected to the riser 4 (schematically shown) as in a conventional tensioner cylinder. The accumulator 26 supplies the compensator 7 with hydraulic fluid 14 via the hy...

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PUM

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Abstract

An apparatus (1) for controlling movements of a free-hanging tubular (4) suspended via at least a connector element (8) by at least one compensator member (7) which is connected to a buoyant vessel (2), said tubular extending into a body of water below the vessel. The apparatus comprises motion sensing means (36) for sensing movements of the compensator member and thus that of the vessel (2), and position indicator means (21) for sensing the position of the connector element (8), and thus that of an upper region of the tubular, with respect to the compensator member. The apparatus further comprises data processing means (22) for determining one or more parameters regarding the movement between the vessel and the upper region of the tubular; and adjusting means (24a, b, 25, 26, 29, 33a-d) for controlling at least the stiffness and dampening of the compensator member (7); whereby the axial loads which are transferred between the compensator and the tubular may be controlled.

Description

technical field [0001] The present invention relates to a method, device and system for controlling the movement of a freely hanging tube suspended by at least one compensator member connected to a buoyant vessel via connecting elements. The invention is particularly suitable for controlling the movement of a water riser (oil pipe, riser) during the soft suspension process. Background technique [0002] When developing subsea oil and gas fields at greater water depths, the equipment used in drilling and production of hydrocarbons will increasingly be floating structures such as drill ships, semi-submersible platforms and drilling rigs. These floating structures move under the influence of waves, wind and currents. This means that the pipes connecting the floating structure to the subsea well must be flexible and strong enough to move with the platform on the surface. Because motion and wave forces are greatest on the water's surface, the pipe is also exposed to the greates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/00
CPCE21B19/006E21B17/01E21B19/02E21B19/08
Inventor 拉尔斯·波赫纳
Owner AKER MH