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offshore Cheat Sheet by

offshore

Maritime Offshore Value Chain

Life cycle of an offshore oil and gas field
Explor­ation
Seismic survey
 
Licensing round
 
Block concession award
Apraisal
explor­ation drilling
 
appraisal drilling
Field develo­pment
Develo­pment drilling
 
Field develo­pment
Production phase
Commence hydroc­arbon produc­ation
 
Ongoing field develo­pment
 
Instal­lation inspec­tion, repair and mainte­nance
De-com­mis­ioning
Instal­lation de- commis­sioning
 
Return of field licence

Explor­ation

Seismis surveys
Process and interpret the seismic data and map the potential reservoir
• Select explor­ation drilling well locations
Explor­ation drilling
Evaluate the explor­ation well data
Core analysis to establish porosity, water and hydroc­arbon saturation
Production test data to determine flow rates and maximum production potential
Reservoir fluid analysis
Computer simula­tions and models

Stakeh­olders

PGS
Forland
Polarcus
Dolphin Group
Western Geco
CGG Veritas – the World's largest
 

Field develo­pment

Reservoir fluid analysis
Number­,lo­cat­ion­,ty­peo­fwe­lls­,as­ses­sme­nto­foi­lre­covery mechanism, assessment of production over the develo­pment stage
Wells
The design of wells to meet production requir­ements
Facilities
Process facili­ties, infras­tru­cture, termin­al/­export facilities
Operating and mainte­nance strategies
Manning level, daily production level, support requir­ements (helic­opters, OSV)

Production

Regulate production and injection to meet approved plans for the quantity and quality of product
Monitor and record all inform­ation to manage the reservoir, wells and facilities
Further develop or modify the facilities
Plan and schedule all production and mainte­nance activities to minimise production deferment and operation costs
Carry out mainte­nance to safeguard the technical integrity of all well and facilities and ensure their availa­bility over the life of the field

Appraisal

Planning and execution of a data acquis­ition program of additional seismic
Reprod­ucing existing seismic data to obtain enhanced results
Appraisal wells
Appraisal wells
Evaluation of the results from seismic and drilling
Update the computer models
Conceptual field develo­pment planning
Enviro­nmental impact assessment (EIA)
 

Types of Mobile Drilling Units (Rigs)

JU:
Jack-up
SEMI:
Semi-s­ubm­ersible
DS:
Drillship

Stakeh­olders

Rig owners
North Atlantic Drilling
 
Ocean Rig
 
Maersk Drilling
Floating Production
Sevan
 
Flex LNG
 
Maersk

Decomm­iss­ioning

Plug and abandon wells
Dismantle and remove the jacket and all facilities from the site
Restore the site to its original condition
Conduct a final enviro­nmental impact study

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