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

[0010]An objective of the present invention is to simplify the eq

Problems solved by technology

If a floating surface installation is used, it may

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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Example

[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
CPCE21B33/063E21B34/04E21B33/064E21B33/035E21B33/0355
Inventor NILSEN, HANS CHRISTIAN
Owner AKER SOLUTIONS AS
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