anchors for deepwater mooring planning & installation
DESCRIPTION
Presentation about new Anchors for Deepwater Mooring Planning & InstallationTRANSCRIPT
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E x p e c t M o o r f r o m a L e a d e r .
Anchors for Deepwater Mooring Planning & Installation
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Presentation Overview
Jamie Armstrong: Planning deepwater mooring systems Hazards & geophysical surveys Design for GOM hurricane season Installation calculations Mooring system approval Example field layout
Bob Wilde: Geotechnical investigation Anchor types and associated seafloor footprint Anchor installation simulations
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Planning Deepwater Mooring Systems Hazards & Geophysical Survey
Shallow Faults/Hazards Gas Seeps/Shallow Gas Slump Sediments Shallow Water Flows Hydrates Soil Borings Archeological Sites Field Infrastructure
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Geophysical AnalysisAUV Sub-bottom Profile
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Planning Deepwater Mooring Systems
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Design for GOM Hurricane Season New Hurricane Mooring Environmental Criteria (API 2INT-MET & Site Specific)
New API Guidance (API RP 2SK Hurricane Design Commentary Appendix K)
New MMS Approval Process Requires an Understanding of the Risk
Requirement for Mooring Analysis to Estimate Probability of Failure
Requirement for Consequence Analysis to Estimate Consequence of Failure
0.025.050.075.0
100.0125.0150.0175.0200.0
N
NE
E
SE
S
SW
W
NW
Semi-submersible
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Design for GOM Hurricane SeasonRegionally & Seasonally Varying Metocean Data West: 97.5W to 95W West-Central: 94W to 90.5W Central: 89.5W to 86.5W East: 85.5W to 82.5W
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Design for GOM Hurricane SeasonRegionally & Seasonally Varying Metocean Data
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Design for GOM Hurricane Season
Assessment ResultsBlock Area Garden Banks Rig Name: Overall Summary of Results (Summed over all Octants)Operator: ValueLocation Name: 6.50 6.5 =Block Area ComponentOCS Designation: 62.59Water Depth at Wellsite 0.64 0.6 =Block Area ComponentRig Heading 7.96Latitude: 0.20Longitude: Expected Ranges:UTM-N (Grid): 0 to 30 LowUTM-E (Grid): 30 to 75 Medium
Are JIP Factor Values used throughout? Yes Over 75 HighAnchors: Normal-loaded plate anchor (VLA)
Sea Floor Component: Wire at the Anchor
N NE E SE S SW W NWNear Surface 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0Surfacedist 0.0 0.0 75.0 0.0 0.0 0.0 0.0 0.0Near Subsea 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1Pipelinesdist 1.8 1.8 1.8 0.0 0.0 0.0 0.0 4.2Wellsdist 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1Subsea 1.9 1.9 1.9 0.1 0.1 0.1 0.1 4.4Surface 1.0 1.0 76.0 1.0 1.0 1.0 1.0 1.0Corrected Totals 2.9 2.9 77.9 1.1 1.1 1.1 1.1 5.4
Random
1,873,738.00
Near SurfaceSurfacedist
Near Subsea
Garden Banks 782-Well #204,523
PipelinesdistWellsdist
MODU Mooring Strength and Reliability Joint Industry ProjectLocation-Specific Consequence Assessment Worksheet (Based on API RP2SK Commentary)
Ocean VictoryCallon Petroleum Component
Results
355009,881,098.00 77.89
Total Combined Likelihood Modified Consequence Factor
Consequence Values corrected so that Worst Octant matches Combined Factor:
Which produces worst results, Directional or Random Drift data?
The values in the table are corrected to represent the value for the relevant octant as if there was a 100% certainty that should the MODU break adrift it WILL drift in that relevant octant, but then factored so that the maximum value given as "Total Combined Likelihood Modified Consequence Factor" is aligned with the worst direction. Hence each octant is assigned the full near surface and subsurface values, plus the distant values for that octant multiplied by 8, but then reduced by a ratio to ensure the worst octant value is correct. It is for this reason that the numbers will not be the same as the obvious source of the data.
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Minimum Mooring Line Break Strength Safety Factor vs Return Period
2.34
1.97
1.501.28
Cat 1
Cat 2
Cat 3
1.201.20
1.20
1.69
2.89
1.78
2.17
0.00
0.50
1.00
1.50
2.00
2.50
3.00
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Return Period (Years)
S
a
f
e
t
y
F
a
c
t
o
MinimumIntactDynamicSF
MinimumDamagedDynamicSF
APIRequiredIntactSF=1.67
APIRequiredDamagedSF=1.25
Note: These are the extreme minima from all mooring lines and all environmental headings
Design for GOM Hurricane Season
Estimate Probability of Failure for Mooring Lines
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Installation Calculations
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Potential Mooring Configurations
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Mooring System Approval Requirement for Equipment Inspections to Validate their Capacity
All above is rolled into InterMoors MMS Submittal for Approval
Requirement for As-Built Mooring Verification Analysis (Proof that it works)150 Wave Heading
Wave Frequency Motion RAO20.4m Loaded Draft - Includes Viscous Roll Damping
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
0.00 5.00 10.00 15.00 20.00 25.00 30.00
Period (seconds)
R
A
O
(
m
/
m
)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
R
A
O
(
d
e
g
/
m
)
SURGECGSWAYCGHEAVECGROLLPITCHYAW
FPSO
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Example Field Layout
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Presentation Overview
Jamie Armstrong: Planning deepwater mooring systems Hazards & geophysical surveys Design for GOM hurricane season Installation calculations Mooring system approval Example field layout
Bob Wilde: Geotechnical investigation Anchor types and associated seafloor footprint Anchor installation simulations
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Geotechnical AnalysisPCPT Test Data
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Geotechnical Analysis
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Suction Embedded Anchors
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Red Hawk Suction Anchors
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Thunder Horse PLET Anchors
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Thunder Horse Manifold PilesThunder Horse Manifold Piles
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Pipeline Starter Anchors
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ROV Interface
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Driven Piles
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Menck MHU-500C Hammer
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High Holding Power Drag AnchorsDrag Embedment
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Plate Anchor Types
DRAG EMBEDMENT DIRECT EMBEDMENT (SEPLA)
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Follower + SEPLA Anchor
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SEPLA Anchor
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Suction Pile vs Plate Anchor
SEPLA5.75 X 157.3 tons
SUCPILE8 X 2524 tons
SUCPILE8 X 4535 tons
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High Holding Power Drag Anchors
Courtesy of Vryhof Anchors BV
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High Holding Power Drag AnchorsDeepC D4.1-02 Date: 30 Dec 2008 15:11:18
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
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Anchor line results
Local X [m]
L
o
c
a
l
Z
[
m
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AnchorAnalysis5.lineResult, Shackle depth Z=-0.1m AnchorAnalysis5.lineResult, Shackle depth Z=-2m AnchorAnalysis5.lineResult, Shackle depth Z=-4m AnchorAnalysis5.lineResult, Shackle depth Z=-5mAnchorAnalysis5.lineResult, Shackle depth Z=-6m AnchorAnalysis5.lineResult, Shackle depth Z=-8m AnchorAnalysis5.lineResult, Shackle depth Z=-10m AnchorAnalysis5.lineResult, Shackle depth Z=-12mAnchorAnalysis5.lineResult, Shackle depth Z=-14m AnchorAnalysis5.lineResult, Shackle depth Z=-16m AnchorAnalysis5.lineResult, Shackle depth Z=-18m AnchorAnalysis5.lineResult, Shackle depth Z=-19.6m
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High Holding Power Drag Anchors
DeepC D4.1-02 Date: 30 Dec 2008 15:30:47
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240
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Anchor line results
Local X [m]
L
o
c
a
l
Z
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m
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AnchorAnalysis5.lineResult, Shackle depth Z=-0.1m AnchorAnalysis5.lineResult, Shackle depth Z=-2m AnchorAnalysis5.lineResult, Shackle depth Z=-4m AnchorAnalysis5.lineResult, Shackle depth Z=-5mAnchorAnalysis5.lineResult, Shackle depth Z=-6m AnchorAnalysis5.lineResult, Shackle depth Z=-8m AnchorAnalysis5.lineResult, Shackle depth Z=-10m AnchorAnalysis5.lineResult, Shackle depth Z=-12mAnchorAnalysis5.lineResult, Shackle depth Z=-14m AnchorAnalysis5.lineResult, Shackle depth Z=-16m AnchorAnalysis5.lineResult, Shackle depth Z=-18m AnchorAnalysis5.lineResult, Shackle depth Z=-19.6m
0.
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Pile AnchorsDeepC D4.1-02 Date: 30 Dec 2008 17:12:16
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
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Anchor line results
Local X [m]
L
o
c
a
l
Z
[
m
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AnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1200kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1400kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1600kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1800kN
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Pile AnchorsDeepC D4.1-02 Date: 30 Dec 2008 17:10:51
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
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Anchor line results
Local X [m]
L
o
c
a
l
Z
[
m
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AnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1200kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1400kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1600kNAnchorAnalysis6.lineResult, Shackle depth Z=-20m, Dip down tension=1800kN
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SEPLA Anchors with Taut LegDeepC D4.1-02 Date: 31 Dec 2008 11:43:40
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
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Anchor line results
Local X [m]
L
o
c
a
l
Z
[
m
]
AnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=2000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=3000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=4000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=5000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=6000kN
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DeepC D4.1-02 Date: 31 Dec 2008 11:45:56
-4 -2 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
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Anchor line results
Local X [m]
L
o
c
a
l
Z
[
m
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AnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=2000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=3000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=4000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=5000kNAnchorAnalysis7.lineResult, Shackle depth Z=-20m, Dip down tension=6000kN
SEPLA Anchors with Taut Leg
Anchors for Deepwater Mooring Planning & InstallationPresentation OverviewPlanning Deepwater Mooring SystemsGeophysical AnalysisPlanning Deepwater Mooring SystemsDesign for GOM Hurricane SeasonDesign for GOM Hurricane SeasonDesign for GOM Hurricane SeasonDesign for GOM Hurricane SeasonInstallation CalculationsPotential Mooring ConfigurationsMooring System ApprovalExample Field LayoutPresentation OverviewGeotechnical AnalysisGeotechnical AnalysisSuction Embedded AnchorsRed Hawk Suction AnchorsThunder Horse Manifold PilesROV InterfaceDriven PilesMenck MHU-500C HammerHigh Holding Power Drag AnchorsPlate Anchor TypesFollower + SEPLA AnchorSEPLA AnchorSuction Pile vs Plate AnchorHigh Holding Power Drag AnchorsHigh Holding Power Drag AnchorsHigh Holding Power Drag AnchorsPile AnchorsPile AnchorsSEPLA Anchors with Taut LegSEPLA Anchors with Taut Leg