An offshore system for drilling or production includes a buoyant hull. In addition, the offshore system includes a topside mounted to the hull and positioned above the surface of the water. Further, the offshore system includes a conductor having a lower end disposed in the sea bed below the sea flo
An offshore system for drilling or production includes a buoyant hull. In addition, the offshore system includes a topside mounted to the hull and positioned above the surface of the water. Further, the offshore system includes a conductor having a lower end disposed in the sea bed below the sea floor and an upper end coupled to the topside. Still further, the offshore system includes a bend restrictor disposed about the conductor. The bend restrictor has a lower end positioned in the sea bed below the sea floor and an upper end positioned above the sea floor.
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1. An offshore system for drilling or production, the system comprising: a buoyant hull;a topside mounted to the hull and positioned above the surface of the water;a conductor having a lower end disposed in the sea bed below the sea floor and an upper end coupled to the topside;a bend restrictor com
1. An offshore system for drilling or production, the system comprising: a buoyant hull;a topside mounted to the hull and positioned above the surface of the water;a conductor having a lower end disposed in the sea bed below the sea floor and an upper end coupled to the topside;a bend restrictor comprising a first sleeve disposed about the conductor, wherein the first sleeve has a central axis, a lower end positioned in the sea bed below the sea floor, an upper end positioned above the sea floor, a lower portion extending axially from the sea floor to the lower end, and an upper portion extending axially from the sea floor to the upper end;wherein the upper portion has a first axial length, and the second portion has a second axial length that is the same as the first axial length. 2. The offshore system of claim 1, wherein the conductor has an outer diameter that is less than an inner diameter of the first sleeve. 3. The offshore system of claim 2, wherein an annulus between the conductor and the first sleeve is filled with a rigid material configured to secure the conductor and the first sleeve to one another. 4. The offshore system of claim 3, wherein the rigid material is concrete or grout. 5. The offshore system of claim 1, wherein the first sleeve has a cylindrical inner surface extending between the upper end and the lower end. 6. The offshore system of claim 5, wherein the first sleeve has a non-uniform radial thickness. 7. The offshore system of claim 6, wherein the first sleeve has a radial thickness that is a maximum at the sea floor and decreases moving axially from the sea floor toward each of the upper end and the lower end. 8. The offshore system of claim 5, wherein the first sleeve is made of steel, aluminum, or titanium. 9. The offshore system of claim 1, wherein the bend restrictor further comprises a second sleeve disposed about the first sleeve. 10. The offshore system of claim 9, wherein the second sleeve has an upper end disposed above the sea floor and a lower end disposed below the sea floor; wherein the second sleeve has a central axis, an upper portion extending axially from the sea floor to the upper end of the second sleeve and a lower portion extending axially from the sea floor to the lower end of the second sleeve, wherein the upper portion of the second sleeve has a first axial length and the lower portion of the second sleeve has a second axial length that is the same as the first axial length of the upper portion of the second sleeve. 11. The offshore system of claim 1, wherein the first sleeve has a radial thickness between 0.25 in. and 3 in. 12. The offshore system of claim 11, wherein the first sleeve has an axial length measured between the upper end and the lower end, wherein the axial length is greater than 10 m. 13. A method for reducing bending stresses in a subsea conductor, the method comprising: penetrating the sea floor with a bend restrictor;advancing the bend restrictor vertically into the sea floor, wherein the bend restrictor has a central axis, an upper end disposed above the sea floor, a lower end disposed below the sea floor, a lower portion extending axially from the sea floor to the lower end, and an upper portion extending axially from the sea floor to the upper end, wherein the upper portion has a first axial length, and the lower portion has a second axial length that is the same as the first axial length;cutting the bend restrictor at a location above the sea floor;extending the conductor through the bend restrictor;radially spacing the bend restrictor from the conductor;bending the conductor; andrestricting bending of the conductor with the restrictor. 14. The method of claim 13, further comprising: filling an annulus between the conductor and the bend restrictor with a rigid material to secure the conductor and the bend restrictor to one another. 15. The method of claim 13, further comprising coupling the conductor to a buoyant hull of an offshore structure. 16. A bend restrictor for restricting bending of a conductor extending into the sea floor, the bend restrictor comprising: a sleeve disposed about the conductor, wherein the sleeve has a central axis, a lower end positioned in the sea bed below the sea floor and an upper end positioned above the sea floor;wherein the sleeve has an inner diameter greater than an outer diameter of the conductor;wherein the sleeve has a first portion extending from the sea floor to the upper end and a second portion extending from the sea floor to the lower end;wherein the first portion has a first axial length and the second portion has a second axial length that is the same as the first axial length; andwherein the sleeve has a radial thickness that is a maximum at the sea floor and decreases moving axially from the sea floor toward each of the upper end and the lower end. 17. The bend restrictor of claim 16, wherein an annulus between the conductor and the bend restrictor is filled with a rigid material configured to secure the conductor and the bend restrictor to one another. 18. The bend restrictor of claim 16, wherein the sleeve has a cylindrical inner surface extending between the upper end and the lower end. 19. The bend restrictor of claim 16, wherein the sleeve has a radial thickness between 0.25 in. and 3 in. and an axial length measured between the upper end and the lower end, wherein the axial length is greater than 10 m. 20. The bend restrictor of claim 16, wherein the bend restrictor comprises an inner sleeve disposed about the conductor and an outer sleeve disposed about the inner sleeve.
Sparks Charles (Le Vesinet FRX) Odru Pierre (Fontenay Sous Bois FRX) Auberon Marcel (Le Haillan FRX) Metivaud Guy (Talence FRX), Process for manufacturing a variable stiffness line and associated element.
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