integrity and safety associated with floating...

© Marine Operations and Assurance Management Solutions Ltd

Martin L Shaw MBA C Eng C Mar Eng FI Mar EST AFNI

Managing Director Marine Operations and Assurance Management Ltd

Finding Petroleum FPSO Conference

Integrity and Safety associated with Floating Operations


Outline

• Context

• What the FPSO hull needs to do

• Requirements drive design decisions

– New build

– Conversion

• Case Studies

• Operation and Export

• Assurance


Why use an FPSO?

• No pipeline infrastructure

• Deep water

• Environmental issues- disconnectable?

• Small field

• Re-usable?

• Early first oil

Courtesy BP PLC


Integrity vs. Economics-The Balance

PR

OTE

CTI

ON

PRODUCTION (PERFORMANCE)

After James Reason Managing the Risks of Organisational Accidents


What the hull needs to do

Primary Requirements

• Keep the water out

• Keep the oil in

• Stay upright

• Carry the weight

• Stay where you put it


What the hull needs to do

‘Secondary’ Requirements

• Production and export optimisation

• Economics

– Early oil

– Cost

• Maintainability

• Accessibility

• Safety

• Comfort


Requirements drive design

FPSO

Field •Production •Reserves

Environment •Wind and waves •Current •Tropical Storms

Legislation •Safety Case •Accommodation •Double Hull

Off take •Conventional/shuttle •System/ spot •Distance from market •Offshore Loading Discount

Design •Size •DH/DS/SH •Process plant size •Connectable/disconnectable •Accommodation for’d/aft •Mooring system •Offtake system •Weathervaning/spread mooring •Dumb/powered

Critical Decision Newbuild or conversion


New Builds

Benefits

• New, clean hull with no history

• Can be designed for the purpose

– deck support for double deckers

– double sided simplifying structure and improving stability

– accommodation can be larger/located forward if required

Risks

• Costs can get high

– Specialised yards

– Build yard process flow

• Unique designs have unique risks

• Optimisation

– Hull design

– Hull strength

– Size


Conversions

Benefits

• Reduced build time(?)

• Ship shaped and engined for disconnectable

• Cheaper(?)

• History

Risks

• Design risk at FEED while hull choice being made

• Suitable Hulls

– Single hull or double hull few double sided

– Lighter scantlings and high tensile steel problems

• Limits on deck load

• Tank and deck repair work can be expensive

• Accommodation

– Size

– Position


Case Study One location two solutions

Powered FPSO, limited storage, originally with dp1 tankers

Weathervaning (limited heading control) FPSO, 1 million bbl storage with dp2 tanker

Courtesy BP PLC

Courtesy Teekay


Case study-legislation issues

Courtesy BP PLC


Integrity of the offtake system

FPSO

Shuttle

Wells

Conventional Trade Tankers

Market

Transhipment Port

•Benign Conditions •Could be spread moorings and buoy •May Require Tugs •Unpredictability/Laydays •Offshore loading discount •Interface Issues

•Weather issues •Weathervaning or STL •DP shuttle •Dedicated vessels •More control over system

•Storage Capacity •Production •Weather •Offshore Loading Discount

•Additional Port Costs •Brings extra storage to system •Final export on trade tankers on terminal loading

•Trade port delays can shut down production •Needs multiple vessels •Offshore loading discount


Simpler Assurance

Is the design right for the field

and the environment?

Is the unit being built to the

design intent?

Is the unit being operated to the design intent?

Change Management

Yes

Yes

No

Assurance •Risk •Design Standards •Construction Standards •Learning •Competency •Operating Procedures •Contractor selection •Offtake vetting

moams.net

https://sites.google.com/site/moamsltd


Conclusions

• Number and scale of FPSO Developments increasing

• Good FPSO design, construction and operation is a blend of offshore and marine disciplines

• Field requirements and environment drive design choices which drive integrity

• System integrity important

• Assurance and change management during design, build and operations provides integrity

And finally......................


Without the ‘F’ your PSO is sunk

Questions?

integrity and safety associated with floating...

Documents