Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1997-12-01
2000-02-29
Lillis, Eileen Dunn
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
405197, 405200, 405201, 405209, 114121, 114264, 114267, E02B 1708, B63B 3544
Patent
active
060301481
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for improving the feasibility of a drilling rig of jack-up type. The drilling rig has a frame part comprising a working deck and an essentially plane shaped bottom, inside of which there has been arranged at least a part of the power production and operating equipment of the drilling rig. In connection with the frame part there has been arranged at least three feet operated by lifting devices, by means of which the drilling rig may be supported on the sea bottom during an attachment phase through lowering the same from a standby position, required by a transportation position of the drilling rig essentially in a vertical direction with respect to the frame part, to a working position enabling at least a drilling function and detached from the sea bottom during a detachment phase through lifting the feet upwardly with respect to the frame part, and a drilling unit for drilling. The drilling unit is moveable essentially in a horizontal plane with respect to the frame part by means of a first transferring arrangement, such as by actuators driven electricity, pressurized medium and/or correspondingly and a slide rail assembly or a like, to perform the drilling during the drilling situation essentially from outside the frame part. An air-bed or a like known as such is being blown below the frame part of the drilling rig by means of a blow arrangement at least to eliminate strokes directed from the sea level to the bottom of the frame part.
BACKGROUND OF THE INVENTION
In the above use it is nowadays known to use so called semi-submersible drilling rigs and the type of jack-up drilling rigs as described above. The above drilling rigs differ from each other in such respect, that semi-submersible drilling rigs comprise an underwater part, which supports the actual working deck existing on the sea level.
Such a drilling rig is not supported stationary on the ground at all during a drilling function, that is why the type of drilling rig requires expensive and complicated joint and movement arrangements between the drilling device drilling the ground and the drilling rig, which enable drilling despite the roll of the sea. Both the costs of manufacturing and operating of such type of drilling rigs are multiple, when compared to drilling rigs of jack-up type described above. One crucial advantage of the type of drilling rigs above compared to nowadays drilling rigs of jack-up type is, however, that because of the massive construction of the same they may be transported in most heterogeneous circumstances, even during a relatively high roll of the sea. In addition to that, they may be used at clearly deeper water, than jack-up rigs, which may be used when the depth of water is usually below 150 m.
Presently many problems are involved with a typical drilling rig of jack-up type, though it has certain significant advantages particularly when compared to those drilling rigs of semi-submersible type described above. First of all it is significantly cheaper to manufacture and to use, since, that the drilling rig of jack-up type is attached stationary on the sea bottom during the drilling situation. This is why complicated joint and movement arrangements are not needed, because the drilling unit drilling the ground does not move significantly with respect to the frame of the drilling rig during the drilling situation. However certain problems are involved with the type of nowadays drilling rigs, that is why they are not safe enough in practice and not useable even during usual circumstances that are characteristic to certain operational areas.
First of all the type of drilling rig may not be safely transported, when the height of the waves is more than 2 m. This is due to the flat shape of the bottom of the frame part, whereby the waves, particularly during a so called transito-phase that is, when the frame part is rising above the sea level when the drilling rig is supported on the sea bottom or respectively when it is lowered on the sea level, when the drilling rig
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Cande Mikael
Tormala Pasi
Lee Jong-Suk
Lillis Eileen Dunn
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