System, vessel, seabed installation and method for producing oil or gas
First Claim
1. A system for offshore production of oil or gas, comprisinga surface vessel having an apparatus for maintaining a desired position and orientation;
- a bottom installation at a seabed for at least two production wells; and
at least one riser for connecting the bottom installation to the vessel;
wherein the vessel is provided with drilling equipment for wells at the seabed and with process equipment for produced oil or gas;
wherein the bottom installation comprises a template having a foundation at the seabed, and provided with a manifold unit and designed with at least two wellhead sections adapted for installation of associated christmas trees;
and further comprising a drill string adapted to extend from the drilling equipment at the vessel, and a movable operation module adapted to be installed on the bottom installation and to be connected to a lower end of the drill string; and
wherein the at least one riser includes a product riser adapted to connect the operation module to the process equipment on the vessel.
5 Assignments
0 Petitions
Accused Products
Abstract
A system for offshore production of oil or gas, comprising a surface vessel having a means for maintaining a desired position and orientation, a bottom installation at the seabed for at least two production wells, and risers for connecting the bottom installation to the vessel. The vessel is provided with drilling equipment for wells at the seabed and with process equipment for produced oil or gas. The bottom installation comprises a template having its foundation at the seabed and being provided with a manifold unit and is designed with at least two well head sections adapted for installing associated Christmas trees. A drill string is adapted to extend from the drilling equipment on the vessel to an operation module at the bottom installation, and a product riser is adapted to connect the operation module to the process equipment on the vessel.
51 Citations
30 Claims
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1. A system for offshore production of oil or gas, comprising
a surface vessel having an apparatus for maintaining a desired position and orientation; -
a bottom installation at a seabed for at least two production wells; and
at least one riser for connecting the bottom installation to the vessel;
wherein the vessel is provided with drilling equipment for wells at the seabed and with process equipment for produced oil or gas;
wherein the bottom installation comprises a template having a foundation at the seabed, and provided with a manifold unit and designed with at least two wellhead sections adapted for installation of associated christmas trees;
and further comprising a drill string adapted to extend from the drilling equipment at the vessel, and a movable operation module adapted to be installed on the bottom installation and to be connected to a lower end of the drill string; and
wherein the at least one riser includes a product riser adapted to connect the operation module to the process equipment on the vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a swivel unit having a vertical axis, in association with the product riser.
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3. The system according to claim 2,
wherein the swivel unit is located on the vessel. -
4. The system according to claim 2,
wherein the swivel unit is incorporated in the operation module. -
5. The system according to claim 4,
wherein the operation module includes a blowout preventer and the swivel unit is located underneath said blowout preventer. -
6. The system according to claim 4,
wherein the product riser extends upwards through the water for connection at the vessel at a point at a distance from the drilling equipment. -
7. The system according to claim 6,
wherein the product riser extends up through the water in an approximate S-shape with an upwardly curved, elevated middle portion of the product riser. -
8. The system according to claim 4,
wherein the product riser extends upwards through the water for connection at the vessel at a point at a distance from the drilling equipment, abaft on the vessel. -
9. The system according to claim 2,
wherein the swivel unit is motor-driven. -
10. The system according to claim 2,
wherein the swivel unit has a through-going axial hole for the drill string. -
11. The system according to claim 2,
wherein the swivel unit is motor-driven under control by said apparatus for maintaining the vessel at a desired position and orientation. -
12. The system according to claim 1, wherein the product riser is attached along a drilling riser for the drill string.
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13. The system according to claim 1,
wherein the vessel is provided with an apparatus for dynamic positioningl/orientation.
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14. A vessel comprising;
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drilling equipment for wells at a seabed and process equipment for produced oil and gas;
an apparatus for maintaining a desired position and orientation at the sea surface; and
an apparatus for controlling a swivel unit, in association with said position maintaining apparatus for maintaining a desired position and orientation, being based on dynamic positioning and orientation. - View Dependent Claims (15, 16, 17)
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18. A bottom installation comprising;
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a template having a foundation at a seabed, wherein the template is provided with a manifold unit and is designed with at least two wellhead sections adapted for installation of associated christmas trees; and
a movable operation module adapted to establish a rotatable connection to a riser extending to a surface vessel. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A system for offshore production of oil or gas, comprising;
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a surface vessel equipped with an apparatus for maintaining a desired position and orientation;
a bottom installation at a seabed for at least two production wells; and
risers for connecting the bottom installation to the vessel;
wherein the vessel is provided with drilling equipment for wells at the seabed and with process equipment for produced oil or gas;
wherein the bottom installation comprises a template having a foundation at the seabed, and provided with a manifold unit and designed with at least two wellhead positions or sections adapted for installation of associated christmas trees;
and further comprising a drill string adapted to extend from the drilling equipment on the vessel to a blowout preventer on the bottom installation; and
wherein the risers include a product riser adapted to connect one or more production wells on the bottom installation to the process equipment on the vessel.
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27. A method of producing oil or gas with a system including a surface vessel, a bottom installation for at least two production wells and provided with a manifold unit and a plurality of wellhead sections, and at least one riser for connecting the bottom installation to the vessel comprising;
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deploying said bottom installation at a seabed and positioning said vessel at the sea surface above the bottom installation;
drilling and completing a first well at one of said plurality of wellhead sections;
initially drilling a second well at a second one of said plurality of wellhead sections;
setting down an operation module with one of said at least one risers for landing and connection at the second one of said plurality of wellhead sections and additionally drilling and completing the second well;
establishing production from the first well through said manifold and the operation module at the second one of said plurality of wellhead sections contemporaneous with the additional drilling of the second well;
drilling a corresponding third well from a third one of said plurality of wellhead sections and subsequently establishing production through the operation module from the third well. - View Dependent Claims (28, 29, 30)
installing both conductor and casing tubes for the second well.
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29. The method of producing oil or gas according to claim 27, further comprising:
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additionally drilling one or more new wellhead sections;
disconnecting and removing the operation module from the one or more new wellhead sections after a desired number of wells have been drilled, completed and put into production.
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30. The method of producing oil or gas according to claim 27, further comprising:
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additionally drilling one or more new wellhead sections;
finally locating the operation module at a dedicated section of the bottom installation separated from the new well head sections.
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Specification