Ice worthy jack-up drilling unit with conical piled monopod and sockets
First Claim
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1. A system for drilling and producing hydrocarbons in potential ice conditions in offshore areas comprising:
- a rig having a flotation hull with a relatively flat deck at the upper portion thereof and an ice-bending shape along the lower portion thereof and extending downwardly and inwardly around the periphery of the hull where the ice-bending shape extends from an area of the hull near the level of the deck and extends downwardly near the bottom of the hull;
an ice deflecting portion extending around the perimeter of the bottom of the hull to direct ice around the hull and not under the hull;
at least three legs that are positioned within the perimeter of the bottom of the flotation hull wherein the legs are arranged to be lifted up off the seafloor so that the rig may be towed through shallow water and also extend to the sea floor and extend further to lift the hull partially or fully out of the water; and
a jack-up device associated with each leg to both lift the leg from the sea bottom so that the ice worthy jack-up rig may float by the buoyancy of the hull and push the legs down to the seafloor and push the hull partially up and out of the water when ice floes threaten the rig and fully out of the water when ice is not present; and
a conical piled monopod having a body with a base at the bottom and a top deck at the top wherein the base is attached to pilings that are driven into the seafloor when the conical piled monopod structure is installed for use, an inclined ice engaging surface around the body extending from a wider lower region to a narrower upper region where the lower region is below the sea surface and the upper region is above the sea surface and includes tabs with sockets arranged to receive a foot on at least one of the legs to be attached and held in place for drilling through the conical piled monopod;
wherein the rig is arranged to lift its hull out of the water and drill through the conical piled monopod, lower itself into the water to assume an ice defensive position such that ice would contact the ice-bending shape of the rig when ice is present, and be moved away when desired as the ice thickens.
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Abstract
The invention relates to an ice worthy jack-up rig with a conical piled monopod working together to drill wells and produce hydrocarbons in ice prone locations. The inventive rig would work like a conventional jack-up rig while in open water with the hull jacked up out of the water. However, in the event of ice conditions, the legs are held in place by cans embedded in the sea floor to resist lateral movement of the rig and in sockets attached to the conical piled monopod. Both the hull and conical piled monopod are shaped with ice-bending surfaces to bend and break up ice that comes into contact.
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Citations
14 Claims
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1. A system for drilling and producing hydrocarbons in potential ice conditions in offshore areas comprising:
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a rig having a flotation hull with a relatively flat deck at the upper portion thereof and an ice-bending shape along the lower portion thereof and extending downwardly and inwardly around the periphery of the hull where the ice-bending shape extends from an area of the hull near the level of the deck and extends downwardly near the bottom of the hull;
an ice deflecting portion extending around the perimeter of the bottom of the hull to direct ice around the hull and not under the hull;
at least three legs that are positioned within the perimeter of the bottom of the flotation hull wherein the legs are arranged to be lifted up off the seafloor so that the rig may be towed through shallow water and also extend to the sea floor and extend further to lift the hull partially or fully out of the water; and
a jack-up device associated with each leg to both lift the leg from the sea bottom so that the ice worthy jack-up rig may float by the buoyancy of the hull and push the legs down to the seafloor and push the hull partially up and out of the water when ice floes threaten the rig and fully out of the water when ice is not present; anda conical piled monopod having a body with a base at the bottom and a top deck at the top wherein the base is attached to pilings that are driven into the seafloor when the conical piled monopod structure is installed for use, an inclined ice engaging surface around the body extending from a wider lower region to a narrower upper region where the lower region is below the sea surface and the upper region is above the sea surface and includes tabs with sockets arranged to receive a foot on at least one of the legs to be attached and held in place for drilling through the conical piled monopod; wherein the rig is arranged to lift its hull out of the water and drill through the conical piled monopod, lower itself into the water to assume an ice defensive position such that ice would contact the ice-bending shape of the rig when ice is present, and be moved away when desired as the ice thickens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for drilling a well in ice prone waters, the method comprising:
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providing a conical piled monopod having a body with a base at the bottom and a top deck at the top and an inclined ice engaging surface around the body extending from a wider lower region to a narrower upper region where the lower region is below the sea surface and the upper region is above the sea surface wherein the conical piled monopod includes at least one tab with a socket for receiving and holding a foot of a jack-up drilling rig; driving pilings into the seafloor and attaching the pilings to the conical piled monopod to fix the conical piled monopod to the sea floor, providing rig having a flotation hull having a relatively flat deck at the upper portion thereof and an ice-bending shape along the lower portion thereof where the ice-bending shape extends from an area of the hull near the level of the deck and extends downwardly near the bottom of the hull and an ice deflecting portion extending around the perimeter of the bottom of the hull to direct ice around the hull and not under the hull; providing at least three legs that are positioned within the perimeter of the bottom of the hull; jacking down each leg in a manner that at least one foot on the bottom of one of the legs engages the socket on the tab of the conical piled monopod and the remaining feet engage the sea floor or another socket on a tab such that the jacking down of the legs lifts the hull up and fully out of the water when ice is not threatening the rig while the rig is drilling a well on a drill site; lowering the hull into the water into an ice defensive configuration so that the ice-bending shape extends above and below the sea surface to bend ice that comes against the rig to cause the ice to submerge under the water and endure bending forces that break the ice where the ice flows past the rig; and drilling a well over the side of the deck and down through the conical piled monopod. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification