Offshore drilling system
First Claim
1. A method for drilling an offshore wellbore at a single wellhead into a seabed from a platform positioned proximate to a water surface and above a water column, comprising:
- withdrawing, with a first conveyance assembly, a first tubular string from the wellbore into the water column at a location proximate to the seabed;
running, with a second conveyance assembly, a second tubular string into the water column and then the wellbore at the location proximate to the seabed after withdrawing the first tubular string from the wellbore with the first conveyance assembly; and
wherein each conveyance assembly has a load path and wherein a load path of the first conveyance assembly is laterally offset from a load path of the second conveyance assembly, and wherein the alternating of operations conducted in the wellbore from the first conveyance assembly and the second conveyance assembly can continue through both the top hole drilling phase and the bottom hole drilling phase through a blowout preventer until the well is completed.
2 Assignments
0 Petitions
Accused Products
Abstract
According to one or more aspects of the invention, a method for drilling an offshore wellbore into a seabed from a platform positioned proximate to the water surface comprises making-up a first tubular string with a first conveyance assembly and running the first tubular string into the wellbore with the first conveyance assembly, wherein the first tubular string enters the wellbore from the water column at an entry position proximate to the seabed; performing a wellbore task with the first tubular string; while the wellbore task is being performed with the first tubular string, making-up a second tubular string in the water column from a second conveyance assembly; withdrawing the first tubular string from the wellbore with the first conveyance assembly once the wellbore task is completed; and running the second tubular string with the second conveyance assembly into the wellbore at the entry point from the water column.
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Citations
24 Claims
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1. A method for drilling an offshore wellbore at a single wellhead into a seabed from a platform positioned proximate to a water surface and above a water column, comprising:
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withdrawing, with a first conveyance assembly, a first tubular string from the wellbore into the water column at a location proximate to the seabed; running, with a second conveyance assembly, a second tubular string into the water column and then the wellbore at the location proximate to the seabed after withdrawing the first tubular string from the wellbore with the first conveyance assembly; and wherein each conveyance assembly has a load path and wherein a load path of the first conveyance assembly is laterally offset from a load path of the second conveyance assembly, and wherein the alternating of operations conducted in the wellbore from the first conveyance assembly and the second conveyance assembly can continue through both the top hole drilling phase and the bottom hole drilling phase through a blowout preventer until the well is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for drilling an offshore wellbore at a single wellhead into a seabed from a platform positioned proximate to a water surface and above a water column, comprising:
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positioning a platform comprising a first conveyance assembly and a second conveyance assembly above a desired location of a wellbore; running a first tubular string from a first conveyance assembly into the water column and to the seabed; forming a first wellbore section utilizing the first conveyance assembly and the first tubular string; making-up a second tubular string with the second conveyance assembly in the water column to a position proximate to the seabed, wherein a portion of making-up the second tubular string is performed while the first conveyance assembly is forming the first wellbore section; withdrawing the first tubular string from the wellbore into the water column at a location proximate to the seabed, with the first conveyance assembly; and running the second tubular string into the wellbore at the location proximate to the seabed with the second conveyance assembly, after the first tubular string is withdrawn from the wellbore with the first conveyance assembly, wherein the alternating of operations conducted in the wellbore from the first conveyance assembly and the second conveyance assembly can continue through both the top hole drilling phase and the bottom hole drilling phase through a blowout preventer until the well is completed. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for drilling an offshore wellbore at a single wellhead into a seabed from a platform positioned proximate to the water surface and above a water column, comprising:
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making-up a first tubular string with a first conveyance assembly; running the first tubular string into the water column and then into the wellbore, wherein the first tubular string enters the wellbore from the water column at an entry point proximate to the seabed; performing a wellbore task with the first tubular string; making-up at least a portion of a second tubular string in the water column with a second conveyance assembly while the task is being performed in the wellbore with the first tubular string; once the wellbore task has been performed with the first tubular string, withdrawing the first tubular string from the wellbore and into the water column with the first conveyance assembly; and running the second tubular string into the wellbore at the entry point from the water column with the second conveyance assembly, wherein the alternating of operations conducted in the wellbore from the first conveyance assembly and the second conveyance assembly can continue through both the top hole drilling phase and the bottom hole drilling phase through a blowout preventer until the well is completed. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification