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1. WO2019043400 - SYSTEM FOR PROVIDING STABILITY TO A FLOATING OFFSHORE STRUCTURE

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[ EN ]

CLAIMS

1. A system for improving the static and dynamic stability of an offshore floating structure comprising :

a plurality of outriggers, each outrigger having a unit, the unit having an inertial mass; and

a support structure, the support structure locatable to the offshore floating structure and holding the units at a radial distance from a centre of rotation of the offshore floating structure;

characterised in that:

the plurality of units are entirely submerged in use.

2. A system according to claim 1 wherein the inertial mass includes a fixed mass.

3. A system according to claim 2 wherein the unit includes a weight to provide the fixed mass.

4. A system according to claim 3 wherein the weight is one or more materials selected from a group comprising : steel, concrete, sand, gravel and water.

5. A system according to any preceding claim wherein the inertial mass includes a variable mass.

6. A system according to claim 5 wherein the unit includes a filler tank and the variable mass is provided by water entering and exiting the filler tank.

7. A system according to claim 6 wherein the filler tank includes one or more ports or valves to control the entry and exit of water to and from the unit.

8. A system according to any preceding claim wherein there is a ballast tank in a unit.

9. A system according to claim 8 wherein the ballast tank is sealed .

10. A system according to claim 8 wherein the ballast tank includes one or more valves.

11. A system according to any preceding claim wherein the units are identical.

12. A system according any preceding claim wherein there are at least three outriggers.

13. A system according to any preceding claim wherein there are an even number of outriggers.

14. A system according to any preceding claim wherein there are an odd number of outriggers.

15. A system accord ing to any preceding claim wherein the outriggers are arranged to provide an evenly d istributed mass around the offshore floating structure.

16. A system according to claim 15 wherein the evenly distributed mass lies on a circumference.

17. A system accord ing to any preceding claim wherein the support structure comprises a plurality of support arms, each arm having a first end for connection to the offshore floating structure and a second end for connection to a unit.

18. A system according to any one of claims 1 to 16 wherein the support structure comprises a plurality of support struts wherein the support struts connect between units and to the offshore floating structure.

19. A system according to any preceding claim wherein the support structure is horizontal with the units.

20. A system according to any preceding claim wherein the support structure is adapted to raise and lower the outriggers.

21. A system according to claim 20 wherein the support structure is arranged to tilt each unit to an angle to the horizontal.

22. A system according to any preceding claim wherein the support structure is detachable from the floating offshore structure.

23. A system according to any preceding claim wherein the offshore floating structure is an offshore hydrocarbon production or supporting facility.

24. A system according to claim 23 wherein the support structure includes connection means for one or more dynamic flexible risers.

25. A system according to claim 24 wherein there is a dropped object protection system arranged over the connection means.

26. A system according to any preceding claim wherein one or more units include a compartment, the compartment having one or more elements of a mooring line and an end of the mooring line is connected to the offshore floating structure.

27. A system according to any preceding claim wherein the system includes a vertical tether mooring system and the outriggers are anchoring points for the vertical tether mooring system.