Petroleum Engineering 406

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Petroleum Engineering 406
Lesson 9 Floating Drilling
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Lesson 9 - Outline

• Floating Drilling Vessels
• Types of Motion
• Types of Waves
• When is Drilling Possible (WOW)
• Vessel Capacities

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Read
PETE 626 Lecture notes on web _at_
http//pumpjack.tamu.edu/juvkam-wold/
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Drillship - moored
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Heave Surge Sway Roll Pitch Yaw
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Motions restricted to the horizontal
plane SURGE Translation fore and aft
(X-axis) SWAY Translation port and starboard
(Y-axis) YAW Rotation about the Z-axis
(rotation about the moonpool) Motions that
operate in vertical planes HEAVE Translation up
and down (Z-axis) ROLL Rotation about the
X-axis Pitch Rotation about the Y-axis
Vessel Motions
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Wave Direction
Beam Waves
Quartering Waves
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Typical Vessel Motion Limits Criteria
Operation Wave Height Heave
ft
ft Drilling Ahead 30 10 Running and
Setting Casing 22 6 Landing BOP and
Riser 15 3 Transferring Equipment 15 -
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What is lt ?
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Some Definitions
Freeboard Draft
Beam
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G center of gravity. B center of buoyancy
G is above B!
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NOTE B has moved!
q
GZ righting arm