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US 2015/0176346 A1Published application
Method and system for wireline intervention in a subsea well from a floating vessel
AssigneeShell Oil Company
InventorsCollin Morris, Martin Buchan, David Russ Larimore, Nivea Boechat Dos Santos Gloria, Gustavo Cervo, Scott Winfield Davis, Scott Alistair Gordon, Mark James Klein, Marc Gerard Paquette
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Abstract
A method for wireline intervention in subsea well from a floating vessel.
Claims10
A method for wireline intervention in an subsea well from a floating vessel, the method comprising:
- a) arranging a tubular tool riser in a substantially horizontal position at a deck of the vessel;
- b) connecting a wireline assembly to a wireline that is connected to a winch arranged at the deck;
- c) inserting the wireline assembly and pass the wireline through a first end of the tool riser into said riser such that the wireline passes along a riser sheave connected to the first end of the tool riser;
- d) connecting the first end of the tool riser to a crane that lifts the tool riser in a substantially vertical position above the deck, whilst unreeling the wireline from the winch such that the wireline assembly remains located within the tool riser;
- e) inducing the crane to move a second end of the tool riser above a guide sleeve which is connected to a side wall of the vessel adjacent to the deck;
- f) inducing the crane to lower the tool riser through the guide sleeve such that the second end of the tool riser is located subsea and the first end of the tool riser and the riser sheave are located above the deck;
- and
- g) inducing a crane heave compensation mechanism to control the motion of the tool riser and riser sheave relative to the seafloor while unreeling the wireline from the winch such that the wireline assembly is lowered from the tool riser through the water into the well.
5 more elements
A system for wireline intervention into an subsea well from a floating vessel, the system comprising:
- a) a floating vessel having a deck configured to support a tubular tool riser in a substantially horizontal position;
- b) a winch at the deck which is configured to be connected to a wireline and wireline assembly;
- c) means for inserting the wireline assembly and part the wireline through a first end of the tool riser into said riser such that the wireline passes along a riser sheave connected to the first end of the tool riser;
- d) a crane that is configured to be connected to the first end of the tool riser and to lift the the tool riser in a substantially vertical position above the deck, whilst unreeling the wireline from the winch such that the wireline assembly remains located within the tool riser;
- e) means for inducing the crane to move a second end of the tool riser above a guide sleeve which is connected to a side wall of the vessel adjacent to the deck;
- f) a crane control mechanism for inducing the crane to lower the tool riser through the guide sleeve such that the second end of the tool riser is located subsea and the first end of the tool riser and the riser sheave are located above the deck;
- and
- g) a crane heave compensation mechanism for controlling the motion of the tool riser and riser sheave relative to the seafloor while unreeling the wireline from the winch such that the wireline assembly is lowered from the tool riser through the water into the well.
5 more elements
Dependencies are inferred from the claim text.