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OCEN 201 Introduction to Ocean

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Title: OCEN 201 Introduction to Ocean


1
OCEN 201Introduction to Ocean Coastal
Engineering
  • Offshore Structures
  • Jun Zhang
  • Jun-zhang_at_tamu.edu

2
  • Offshore Structures
  •      
  • Drilling rigs Exploration of oil and gas
  • Stay in a place for a few months (Mobil or
    movable) 
  • - Jack-up drilling rig
  • - MODU (Mobil Offshore Drilling Unit)
  •    
  • Production platforms Production of oil and gas
  • Stay in a place for at least a few years
    (usually 20 -30 years)
  • - Ground-base structure ( lt500800 m)
  • - Floating Structures (gt 800 m)
  •  

3
Fig. 3-2 Example of jack-up drilling rig Legs
are retractable

4
  • Fig. 3-3
  • A semi-submersible
  • Drilling Rig
  • Mooring system
  • or Dynamic positioning


5
DP - Dynamic Positioning
6
Fig. 3-5 Steel Jacket Platform in 20 200 m
waters lt 500 m Cannot be moved
7
OFFSHORE PLATFORM
8
Fig. 3-6 Concrete Gravity Structure
9
OFFSHORE STRUCTURES
10
OFFSHORE PRODUCTION DRILLING
  • AUGER TLP
  • OCEAN CLIPPER

11
OFFSHORE PLATFORM
  • SPAR
  • FIXED JACKETED

12
DRILLING RIG SPAR
13
Articulated Tower
Fig. 3-10 pp56 New version Fig. 12 pp61
14
Single Anchor Leg Mooring System
Fig. 3-11 pp56 New Version Fig.13 pp62
15
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16
  • Wave Forces on Offshore Structures
  • Morrison Equations
  • Diffraction/Radiation Theory
  • (Potential theory, neglect water viscosity)
  • CFD (Computational Fluid Dynamics)
  • (Navier-Stokes Equations, considering water
    viscosity)

17
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18
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19
Morrison Equations Modified ME
20
Wave Forces on A Vertical Cylinder Velocity
acceleration are a function of z t Force
(function of t)
21
Wave Forces on A Vertical Cylinder
22
Wave Forces on a Horizontal Cylinder Velocity
acceleration are a function of t only
23
Wave Forces on a Horizontal Cylinder
24
Example of Problem 3-1 pp73 (old v.
pp64) Computing the horizontal load on a
vertical cylinder Drag coefficient of a
cylinder pp 72 75 (old v. pp63
64) Added-Mass coefficient of a cylinder pp 72
(old v. pp64)
25
Wind Current Forces Steady oscillatory
portions Steady current forces
26
Wind Forces
27
Forces on Pipeline Due to Wave Currents
28
Free Body diagram of A Pipe under the impact of
Wave Currents
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