Floating offshore facility and a method for drilling a well
First Claim
Patent Images
1. A floating offshore facility for offshore hydrocarbon production, wherein the offshore facility comprises:
- an upper deck and a lower deck,a well bay located on the lower deck, said well bay being composed of a plurality of drilling slots and a plurality of production slots surrounding said drilling slots, each production slot being adapted to receive a production riser after a well is completed at a drilling slot neighbour of said production slot, the plurality of drilling slots forming one continuous opening inside the lower deck,a drilling riser extending from the well bay to the well,a cart located between the upper and lower deck, said cart supporting said drilling riser and being movable together with said drilling riser to a determined drilling slot inside said one opening of the plurality of the drilling slots, said cart in contact simultaneously with said upper deck and the lower deck for transferring a force to said both decks, anda drilling rig located on the upper deck, said drilling rig being movable above the well bay so as to be positioned in alignment above the cart to allow to drill the well in using the drilling riser inside the determined drilling slot.
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Abstract
A floating offshore facility for offshore hydrocarbon production, comprising an upper deck, a lower deck, a well bay comprising a plurality of drilling slots and a plurality of production slots surrounding said drilling slots, a cart (20) supporting a drilling riser and being movable together with said drilling riser inside the opening of the plurality of the drilling slots, and a drilling rig movable above the well bay to drill the well through the drilling riser.
12 Citations
20 Claims
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1. A floating offshore facility for offshore hydrocarbon production, wherein the offshore facility comprises:
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an upper deck and a lower deck, a well bay located on the lower deck, said well bay being composed of a plurality of drilling slots and a plurality of production slots surrounding said drilling slots, each production slot being adapted to receive a production riser after a well is completed at a drilling slot neighbour of said production slot, the plurality of drilling slots forming one continuous opening inside the lower deck, a drilling riser extending from the well bay to the well, a cart located between the upper and lower deck, said cart supporting said drilling riser and being movable together with said drilling riser to a determined drilling slot inside said one opening of the plurality of the drilling slots, said cart in contact simultaneously with said upper deck and the lower deck for transferring a force to said both decks, and a drilling rig located on the upper deck, said drilling rig being movable above the well bay so as to be positioned in alignment above the cart to allow to drill the well in using the drilling riser inside the determined drilling slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for drilling a well, wherein said method is implemented on a floating offshore facility for offshore hydrocarbon production, said offshore facility comprising:
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an upper deck and a lower deck, a well bay located on the lower deck, said well bay being composed of a plurality of drilling slots and a plurality of production slots surrounding said drilling slots, each production slot being adapted to receive a production rise after a well is completed at a drilling slot neighbour of said production slot, the plurality of drilling slots forming one continuous opening inside the lower deck, a drilling riser extending from the well bay to the well, a cart located between the upper and lower deck, said cart supporting said drilling riser and being movable together with said drilling riser to a determined drilling slot inside said one opening of the plurality of the drilling slots, said cart in contact simultaneously with said upper deck and the lower deck for transferring a force to said both decks, and a drilling rig located on the upper deck, said drilling rig being movable above the well bay so as to be positioned in alignment above the cart to allow to drill the well in using the drilling riser inside the determined drilling slot, and wherein the method comprises the following initial steps; moving and securing the cart to said determined drilling slot, and positioning the drilling rig in alignment above the cart, and connecting the drilling riser to the well at the seafloor. - View Dependent Claims (15, 16, 17, 18, 19, 20)
and wherein the initial steps and the above drilling steps are repeated with another drilling slot for drilling another well.
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16. The method according to claim 15, further comprising the following production steps after the disconnecting step:
- installing a production riser at a production slot that is a neighbour of the drilling slot and connecting said production riser to the well at the seafloor that is completed and ready for hydrocarbon production.
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17. The method according to claim 14, wherein the facility further comprises a blow out preventer device located inside the cart and connected above the drilling riser, and wherein during the initial steps of the method, moving the cart moves the drilling riser and the blow out preventer device together without disconnecting blow out preventer device from the drilling riser.
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18. The method according to claim 14 wherein any drilling slot is converted into a production slot by installing a rigid beam to close the slot and a production riser inside said converted drilling slot.
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19. The method according to claim 14, wherein the cart is in contact simultaneously with said upper deck and the lower deck when the cart is moving from one drilling slot to another one drilling slot.
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20. The method according to claim 14, wherein the cart is secured at least to the lower deck when the cart is not moving, and is positioned at the determined drilling slot for drilling a well.
Specification