One-trip wellhead installation systems and methods
First Claim
Patent Images
1. A wellhead assembly system for assembling a tubing head onto a floating vessel and for testing the integrity of a riser string disposed between a floating vessel and a subsea wellhead, the assembly system comprising:
- a) a tubing hanger to be landed upon a stem of a floating vessel, the tubing hanger comprising a housing having a generally vertically-disposed bore therethrough and a landing profile for selectively engaging a stem of a floating vessel;
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 casing section member;
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.
14 Citations
18 Claims
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1. A wellhead assembly system for assembling a tubing head onto a floating vessel and for testing the integrity of a riser string disposed between a floating vessel and a subsea wellhead, the assembly system comprising:
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a) a tubing hanger to be landed upon a stem of a floating vessel, the tubing hanger comprising a housing having a generally vertically-disposed bore therethrough and a landing profile for selectively engaging a stem of a floating vessel;
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 casing section member;
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 the stem of a floating platform, the tool comprising:
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a central piston assembly 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 casing section member;
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 a tubing head. - View Dependent Claims (9, 10, 11)
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12. A method of assembling a tubing head onto a floating vessel and testing the integrity of a riser string disposed between a floating vessel and a subsea wellhead, 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 a central piston assembly to a casing member in a casing string;
pressure testing the casing string;
landing the tubing head onto the stem of a floating platform; and
energizing a riser seal between the landing sub and a surrounding sleeve. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification