News Column

Patent Application Titled "Drilling Ship for a Polar Region" Published Online

May 22, 2014

By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Howard, Norman D. (Houston, TX); Lee, Gi Yun (Geoje Si, KR); Lee, Hun Gi (Anyang Si, KR), filed on June 28, 2011, was made available online on May 8, 2014.

The assignee for this patent application is Transocean Sedco Forex Ventures Limited.

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to an arctic drill ship, and more particularly, to an arctic drill ship in which a weather tight structure minimizing the influence of outside air on a drilling operation in polar regions can be installed economically and easily and a structure causing a disturbance in the drilling work area is minimized.

"Generally, a drill ship is a generic term for ships that explore and drill marine resources such as oil or gas, and examples of the drill ship include a fixed type platform, a semi-submersible drill ship, and so on.

"With the rapid development of technologies necessary to explore and drill oil and natural gas buried under the seabed, the working area of the drill ship has expanded from a shallow area such as a continental shelf having a depth of about 200 m to an area having a poor environment such as a deep sea or a polar region having a depth of 2,000 m or more.

"FIG. 1 is a cross-sectional view illustrating a conventional drill ship. In the conventional drill ship 10, as illustrated in FIG. 1, a drill floor 12 is provided on a deck 12 of a hull 11, and a derrick 13 is fixed to the drill floor 12. The derrick 13 is a large complicated structure provided with beams and a variety of drilling equipments. A large moonpool 14 such a drill well is formed in the hull 11 in order for installation of drilling equipments.

"In the case where such a conventional drill ship is operated in a polar region, the drilling equipment and the workspace are exposed to a low-temperature outside air and thus it is difficult to perform the drilling operation. Therefore, it is necessary to enclose the drilling equipment and the workspace such that they are not exposed to outside air.

"However, in the case of the drill ship, main drilling equipments are extensively disposed in a rig floor, a hurricane deck, and a moonpool zone, it is difficult to enclose the drilling work area through a hull structure of a conventional drill ship. It is uneconomical and there is an unavoidable problem in that structures causing interference dangers during operations are disposed, when considering drilling operation characteristics."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "An aspect of the present invention is directed to an arctic drill ship in which a weather tight structure as a concept of a single compartment is made from a side strake or a position near to the side strake to an upper portion of a hurricane deck, thereby minimizing the influence of outside air on a drilling operation in polar regions and minimizing a structure that disturbs a drilling work area.

"According to an embodiment of the present invention, an arctic drill ship includes: a weather tight structure protecting a drill floor from outside air; and a side strake supporting the weather tight structure around a drilling work area.

"The side strake may include an extension part extending upward from a hurricane deck around the drilling work area, and the weather tight structure is supported on the extension part.

"The arctic drill ship may include a reinforcement part having a grillage girder structure on the side strake.

"Both sides of the drill floor may extend up to a position corresponding to a width of a hull.

"The weather tight structure may include a blocking part enclosing a derrick which protrudes upward.


"FIG. 1 is a cross-sectional view illustrating a conventional arctic drill ship.

"FIG. 2 is a cross-sectional view illustrating an arctic drill ship according to the present invention."

For more information, see this patent application: Howard, Norman D.; Lee, Gi Yun; Lee, Hun Gi. Drilling Ship for a Polar Region. Filed June 28, 2011 and posted May 8, 2014. Patent URL:

Keywords for this news article include: Transocean Sedco Forex Ventures Limited.

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Source: Politics & Government Week