1. Petroleum Engineering 406
Lesson 9 Floating Drilling

2. Lesson 9 - Outline Floating Drilling Vessels Types of Motion
Types of Waves
When is Drilling Possible (WOW)
Vessel Capacities

3. PETE 626 Lecture notes on web @ http://pumpjack.tamu.edu/~juvkam-wold/
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PETE 626 Lecture notes on

5. Drillship
- moored

7. Heave
Surge
Sway
Roll
Pitch
Yaw

8. Vessel Motions
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

9. Wave Direction
Beam Waves
Quartering Waves

10. Typical Vessel Motion Limits Criteria
Operation Wave Height Heave
ft ft
Drilling Ahead
Running and
Setting Casing
Landing BOP and Riser
Transferring Equipment

14. What is “lt” ?

15. Some Definitions
Freeboard
Draft
Beam

17. G = center of gravity. B = center of buoyancy
G is above B!

18. NOTE:
B has moved! q
GZ = righting arm