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

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

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

Geophysical AnalysisAUV Sub-bottom Profile

Planning Deepwater Mooring Systems

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

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

Design for GOM Hurricane SeasonRegionally & Seasonally Varying Metocean Data

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.

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

Installation Calculations

Potential Mooring Configurations

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

Example Field Layout

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

Geotechnical AnalysisPCPT Test Data

Geotechnical Analysis

Suction Embedded Anchors

Red Hawk Suction Anchors

Thunder Horse PLET Anchors

Thunder Horse Manifold PilesThunder Horse Manifold Piles

Pipeline Starter Anchors

ROV Interface

Driven Piles

Menck MHU-500C Hammer

High Holding Power Drag AnchorsDrag Embedment

Plate Anchor Types

DRAG EMBEDMENT DIRECT EMBEDMENT (SEPLA)

Follower + SEPLA Anchor

SEPLA Anchor

Suction Pile vs Plate Anchor

SEPLA5.75 X 157.3 tons

SUCPILE8 X 2524 tons

SUCPILE8 X 4535 tons

High Holding Power Drag Anchors

Courtesy of Vryhof Anchors BV

High Holding Power Drag AnchorsDeepC D4.1-02 Date: 30 Dec 2008 15:11:18

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Anchor line results

Local X [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

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]

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a

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Z

[

m

]

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.

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

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Z

[

m

]

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

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

]

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

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

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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

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]

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[

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

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