One-trip wellhead installation systems and methods
First Claim
Patent Images
1. A wellhead assembly system comprising:
- a) a tubing head adapted to be landed upon a floating structure, the tubing head comprising a housing having a generally vertically-disposed bore therethrough and a landing profile for selectively engaging a floating structure;
b) a running and setting tool comprising;
a central piston assembly radially disposed within the bore of the tubing head and being axially moveable therewithin, a landing sub affixed to a lower end of the central piston assembly and being selectively securable to a riser section member of a riser string extending to a subsea wellhead;
a fluid bore disposed through the central piston assembly and landing sub; and
a matching profile upon the central piston assembly for reversably interconnecting the central piston assembly with the tubing head housing.
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Accused Products
Abstract
Methods and devices are described for efficiently installing sea-borne wellhead components and tying back sub-sea wellhead components with them. In specific aspects, a single running and setting tool is used to land a tubing head housing upon the stem of a floating platform and tension and pressure testing casing string risers extending between a subsea wellhead and a floating vessel.
26 Citations
22 Claims
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1. A wellhead assembly system comprising:
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a) a tubing head adapted to be landed upon a floating structure, the tubing head comprising a housing having a generally vertically-disposed bore therethrough and a landing profile for selectively engaging a floating structure;
b) a running and setting tool comprising;
a central piston assembly radially disposed within the bore of the tubing head and being axially moveable therewithin, a landing sub affixed to a lower end of the central piston assembly and being selectively securable to a riser section member of a riser string extending to a subsea wellhead;
a fluid bore disposed through the central piston assembly and landing sub; and
a matching profile upon the central piston assembly for reversably interconnecting the central piston assembly with the tubing head housing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A running and setting tool for landing portions of a wellhead upon a floating structure, the tool comprising:
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a central piston assembly adapted to be radially disposed within a bore of a tubing head to be axially moveable therewithin, a landing sub affixed to a lower end of the central piston assembly and being selectively securable to a riser section member of a riser string;
a fluid bore disposed through the central piston assembly and landing sub; and
a profile upon the central piston assembly for reversably interconnecting the central piston assembly with the tubing head. - View Dependent Claims (9, 10, 11)
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12. A method of assembling a tubing head onto a floating structure, comprising the steps of:
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reversibly securing an upper portion of a central piston assembly to a tubing head;
reversibly affixing a landing sub on a lower portion of the central piston assembly to a riser section member of a riser string;
pressure testing the riser string;
landing the tubing head onto the floating structure; and
energizing a riser seal between the landing sub and a surrounding sleeve that depends from the tubing head. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of connecting a riser string between a subsea wellhead and a floating structure, comprising:
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(a) lowering a riser string through an opening in the floating structure;
(b) connecting a running tool to a tubing head that has a depending a riser sleeve, lowering the riser sleeve over an upper portion of the riser string and connecting a lower end of the running tool to an upper end of the riser string;
(c) connecting a lower end of the riser string to the subsea wellhead;
(d) while supporting the riser string with the running tool, lowering the tubing hanger and riser sleeve relative to the running tool and landing the tubing head on the floating structure;
then(e) with the running tool, setting a seal between the riser sleeve and an upper portion of the riser string;
then(f) disengaging the running tool from the riser string and removing the running tool from the tubing head. - View Dependent Claims (20, 21, 22)
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Specification