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Vertical xmas tree and workover assembly

Inactive Publication Date: 2017-03-09
AKER SOLUTIONS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new type of Xmas tree used for subsea wells that reduces the equipment needed for maintenance. The invention also includes methods for using the Xmas tree. Overall, this technology makes maintenance more efficient and cost-effective.

Problems solved by technology

If a floating surface installation is used, it may drift off from the position directly above the well.

Method used

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  • Vertical xmas tree and workover assembly
  • Vertical xmas tree and workover assembly
  • Vertical xmas tree and workover assembly

Examples

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Embodiment Construction

[0029]While the invention has been described in general terms above, a more detailed and non-limiting example of embodiment is presented in the following with reference to the drawings, in which

[0030]FIG. 1a is a cross section view of a prior art gate valve in an open position;

[0031]FIG. 1b is a cross section view of the valve in FIG. 1a in a closed position;

[0032]FIG. 1c is an enlarged cross section view of the valve in FIG. 1b;

[0033]FIG. 2 is a schematic overview of a floating surface installation performing workover operation in a subsea well;

[0034]FIG. 3 is a principle view of a workover setup according to prior art;

[0035]FIG. 4 is a principle view according to FIG. 3, however illustrating a setup according to the present invention; and

[0036]FIG. 5 is a principle view of a vertical Xmas tree in the process of landing on a subsea wellhead.

[0037]FIG. 1a to FIG. 1c illustrate a known valve 10 which is suited for well control of a subsea hydrocarbon well. FIG. 1a a shows the valve ...

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Abstract

A vertical subsea Xmas tree (200) having a production bore (203) and two valves (10) in the production bore (203). Each valve (10) has a valve gate (18, 20) which is functionally connected to an actuator (38, 40) moving the valve gate bidirectionally between an open position and a closed position. The production bore (203) is sealed off by the valves (10) in the closed position. The valve gate (18, 20) is provided with a string cutting edge (34).

Description

[0001]The present invention relates to a vertical Xmas tree for a subsea well. In particular there is provided a novel Xmas tree which due to its features reduces the requirement of equipment during workover operations. A workover assembly and associated methods are also presented.BACKGROUND[0002]In the field of subsea wells a Xmas tree is used to control the flow of produced hydrocarbons from the well. It comprises valves adapted to open and close for such flow.[0003]When performing workover operations within the subsea well, the operator needs access to the well through the Xmas tree. In such a scenario, the Xmas tree valves need to be in the open mode. Hence one needs additional measures to maintain well integrity. Typically, from a surface installation a riser is extended down to the well. In some cases a string, such as a coiled tubing or a wire, extends from the surface installation and into the well, through the riser and the Xmas tree to which the riser is connected.[0004]On...

Claims

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Application Information

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IPC IPC(8): E21B33/06E21B33/064E21B34/04E21B33/035
CPCE21B33/063E21B34/04E21B33/064E21B33/035
Inventor NILSEN, HANS CHRISTIAN
Owner AKER SOLUTIONS AS
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