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Effective Cost Saving Strategy for Rigmove OperationsDuncan Cuthill : Viking SeaTech
2 Effective Cost Saving Strategy for Rigmove Operations
Challenges
• Minimise Rigmove TimeNon-operational downtime.
• Minimise RiskTo Personnel, subsea assets,rigs and vessels.
• Eliminate Errors inMooring Operations
Eastern Mediterranean
3 Effective Cost Saving Strategy for Rigmove Operations
Project Overview
Eastern Mediterranean
• Conventionally chain-mooredsemi-submersible
• Multiple well locations withcomplex seabed infrastructure
• Prior experience of problematicand protracted mooring operations
• Solution required to improve andoptimise the rig move process
4 Effective Cost Saving Strategy for Rigmove Operations
Location and Operational Challenges
• Risks to subseaInfrastructure
4 Effective Cost Saving Strategy for Rigmove Operations
Location and Operational Challenges
• Risks to subseaInfrastructure.
• Site soil conditionsand bathymetry
4 Effective Cost Saving Strategy for Rigmove Operations
Location and Operational Challenges
• Risks to subseaInfrastructure.
• Site soil conditionsand bathymetry
• Variance inwater depth
4 Effective Cost Saving Strategy for Rigmove Operations
Location and Operational Challenges
• Risks to subseaInfrastructure.
• Site soil conditionsand bathymetry
• Variance inwater depth
• Semi submersiblehas a chain mooringsystem
5 Effective Cost Saving Strategy for Rigmove Operations
Conventional Mooring : Operational Issues
Two vessels required for installation& recovery of each mooring line.
1. Secondary vessel required to “J hook” andsupport mooring line.
2. High loads at AHV Stern Roller.
3. Damaged / lost anchors and damaged mooringwires during AH operations.
4. Increased risks to personnel working on deck.
5. Significantly increases rig move time.
Mooring system installed at each location prior to drilling unit arrival
System utilises Bruce DENNLA Anchors
Polyester rope / wire rope utilised in place of chain/wire combination
System capable of operating in range of water depths (400 - 1200m)
Designed to accommodate multiple mooring scenarios
Overall mooring “footprint” is significantly reduced.
Viking SeaTech Solution : Preset Mooring Strategy
6 Effective Cost Saving Strategy for Rigmove Operations
Increased Efficiency & Reduced Cost
7 Effective Cost Saving Strategy for Rigmove Operations
Viking SeaTech Mooring Solution - Advantages
Simple system design
Standard components and connections
Reduced system weight
Decreased risk to personnel, vessels and infrastructure
Enhanced station keeping abilityReduced unit offsets reduce drilling downtime
Mooring system integrity is assured prior to rig arrival
No operational delays due to anchoring or AHV problems
8 Effective Cost Saving Strategy for Rigmove Operations
Project Summary : Comparative Project Time Estimate
9 Effective Cost Saving Strategy for Rigmove Operations
Conventional mooringscenario rigmove cost $6,394,000
9 Effective Cost Saving Strategy for Rigmove Operations
Conventional mooringscenario rigmove cost $6,394,000
Preset strategy rigmove cost $2,731,200
9 Effective Cost Saving Strategy for Rigmove Operations
Conventional mooringscenario rigmove cost $6,394,000
Preset strategy rigmove cost $2,731,200
Average Cost Saving perWell over 4 well programme $3,000,000
9 Effective Cost Saving Strategy for Rigmove Operations
Conventional mooringscenario rigmove cost $6,394,000
Preset strategy rigmove cost $2,731,200
Average Cost Saving perWell over 4 well programme $3,000,000
Direct cost savings $12,000,000
10 Effective Cost Saving Strategy for Rigmove Operations
Comparative Models – 4 Wells
• 24.5 days rig time saved over drilling programme – 4 wells / 6 months• Rigmove cost reduced by 47%• Circa $12 million in direct cost savings• Optimised drilling unit utilisation
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