Risks Associated With Moving a Drilling Rig · 2019-11-14 · Location Move Move between fields,...
Transcript of Risks Associated With Moving a Drilling Rig · 2019-11-14 · Location Move Move between fields,...
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Risks Associated With Moving a Drilling RigRichard Palmer
14th November 2019
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Contents
• Introduction
• Selecting the Right Method for a Rig Move
• Overview of Key Risks
• JRC Scope of Work
• Mitigations
• Summary
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Introduction
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There Are Three Ways to Move a Drilling Rig
Wet Tow Where the object is towed on its own buoyancyHighest
Risk
Dry Tow Where the object is towed on a barge Medium
Risk
Dry TransportationWhere the object is transported as deck cargo on a
self propelled ship
Lowest
Risk
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Three Type of Drilling Rig
Jack-Up (Self Elevating Platform)
Semi-Submersible
Drill Ship
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Types of Drilling Rig Move
Field MoveShort move within the oil or gas field between
wells often largely within the drilling configuration <24 hours
Location Move
Move between fields, with the drilling rig often
loaded with some drilling related variable deck
load having due regard for season, route and
points of shelter etc.
24-72 hours
Ocean MoveTypically a move between different geographic
locations> 1 week
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A Typical Loading (For both Dry Tow and Dry Transportation)
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Selecting the Right Method for a Rig Move
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Key Considerations – When Selecting a Rig Move Type
• Distance / Duration
• Route / Season
• How quickly is the rig required?
• Drilling Rig Limitations
• Leg strength
• Air gap
• Wave height
• Availability of Marine Spread … but is it the correct one?
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Matching the Transport Vessel to the Drilling Rig
• As vessels have become larger (wider beam up to 79 metres) their ability to transport
larger drilling rigs has also increased. However the larger vessels also still transport
smaller drilling rigs too.
• So why is it important?
• It’s the same as being in a rowing boat…..
• Sometimes a different transportation vessel would be more favourable to the drilling
rig structure.
• However the cargo owner might have to wait or pay more for that vessel. Commercial
pressures often come to bear. This can be “managed” with heading control or routing,
but there are new risks introduced.
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Credit: Ugland/GPO
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Overview of Key Risks
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Overview of Key Risks
Risk Wet Tow Dry Tow Dry Transportation
Weather Often Most VulnerableIn-between Wet Tow
and Dry TransportationOften Least Vulnerable
Tow Line(s) Single Point of Failure? N/A
Rig Weight / Centre
of Gravity
Within Operations
Manual OKImpact on Motions and Accelerations
Allowable Leg
LoadingLimiting
Generally Less Limiting
than Wet Tow
More Manageable but
Perhaps More Limiting
Cribbing and
Seafastening
Internal Seafastening
Only
Cribbing and seafastening loads plus internal
seafastening
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JRC Scope of Work
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JRC’s “Rig Location & Move Code of Practice” (JR2019-005)
• Basis for the Certificate of Approval:
• The Marine Warranty Surveyor will issue a COA for each critical operation as defined in the
relevant scope of work, provided they are satisfied, so far as possible, that the operations
are conducted in accordance with:
• recognised codes of practice for design and operations;
• best industry practice appropriate for the vessel(s), equipment and location(s);
• vessel(s) and equipment being used within defined safe operating limits;
• current Marine Operations Manual. When an operation is conducted outside the Marine
Operations Manual, this is subject to a formal management of change process, with
senior leadership, technical authority and MWS approval
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JRC’s “Rig Location & Move Code of Practice” (JR2019-005)
• In General the MWS shall review:
• calculations;
• drawings;
• procedures;
• certificates;
• manuals;
• relevant reports;
• routing plans;
• site specific metocean and geotechnical data;
• tow route metocean criteria;
• Classification status, including Conditions of Class, results from previous survey, and timing
of next;
• MOU specific requirements for number of vessels and bollard pull.
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JRC’s “Rig Location & Move Code of Practice” (JR2019-005)
• In General the MWS shall carry out suitability surveys that:
• establish that the relevant items are suitable for the proposed operations;
• make known, in clear terms, in writing to the Assured the recommendations to be
implemented prior to commencement of the proposed operations;
• review Meteorological and Oceanographic (metocean) conditions and, where appropriate,
incorporate requirements as to metocean conditions in the recommendations in the COA;
• observe and record the preparations for the proposed operations;
• attend and witness critical function tests or relevant assurance tests;
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Wet Tow Typical High Level MWS Scope of Work
• Review:
• Jacking Down Operation
• Tow and Positioning Calculations and Methods
• Towage or Transportation Manual / Towmaster Instructions / MODU Ops Manual
• Contingency Planning for Emergencies (Bunkering, bad weather, etc.)
• Attend:
• Tug and Tow Equipment Suitability Survey
• Tow Operation
• Going on Location (includes location approvals – outside of this presentation)
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Dry Transportation Typical High Level MWS Scope of Work
• Review:
• Metocean and Routing
• Tow and Positioning Calculations and Methods
• Transportation Manual and MODU Ops Manual
• Contingency Planning for Emergencies (Bunkering, bad weather, etc.)
• Attend:
• Tug and Tow Equipment Suitability Survey (For Loadout)
• Transportation Vessel Suitability
• Loadout (and Discharge)
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Credit: Ugland/GPO
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Mitigations
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Mitigations
• Engineering for the Transport Manuals – Must be readable
• Metocean
• Motions / Accelerations
• Bollard Pull Requirements
• Seafastening
• Cribbing
• Leg Strength – leg securing (and/or leg length reduction)
• Redundancy
• Crew Experience
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Mitigations
• Weather Forecasts
• Weather Routing
• Heading Control
• Real-Time Cargo Monitoring (OCTOPUS etc.)
• Voyage Simulation
• SafeTrans
• Model Tests
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Mitigations
• The MWS!
• SOMWS MODU Certified
• The ideal mix of engineering and marine input – it cannot be done by one person alone
• Detached from commercial and schedule
• Broad experience to call upon
• Early engagement
• Late engagement may mean risk are already locked in
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Summary
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Summary
• No two transports have the same risk profile
• Transports should be “crew proof”
• Mitigations should not be the starting point (heading control for example)
• Tools are available that work in real-time and look ahead to aid the Master in his
decision-making process
• Crew experience is key (as are the engineering departments)
• The MWS adds value – they should be included as early as possible