integrated+project+-+the+field+lifecycle

8/16/2019 Integrated+Project+-+The+Field+Lifecycle

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Department Petroleum Engineering

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The field life-cycle

Mathias Mitschanek/17.08.2015

Department of Petroleum Engineering


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WHY ROB A BANK?


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GOAL OF FIELD DEVELOPMENT MODULE

• Understand the bigger picture of an oil and gas project

•

Basic understanding of development phases

•

Understand how reservoir rock and fluid propertiesinfluence the development


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PETROLEUM SYSTEM

Definition A petroleum system encompasses

a pod of active source rock and all

genetically related oil and gas

accumulations.

Elements

– Source rock

– Reservoir rock

– Seal rock

– Overburden

Conventional system – Elements are separate

Unconventional system

– Number of Elements can be the

same – E.g. shale source


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BIGGER PICTURE


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BIGGER PICTURE


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ON VS. OFFSHORE RIG

Onshore rig Offshore rig

Capital Investment:10(s) Mio. USD 100(s) Mio. USD

Day rate:

10(s) Tsd. USD 100(s) Tsd. USD


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OIL AND GAS OPERATIONS


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OIL AND GAS CASH FLOW


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Development Lifecycle


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DEVELOPMENT LIFECYCLE

• Exploration

• Appraisal

•

Development

•

Production

• Abandonment


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EXPLORATION

!

is about finding oil and gas fields. Main goal is to identifyand deliver commercially viable field development

opportunities. The following geological and geophysical

(G&G) activities would take place:• Conduct seismic surveys

•

Process and interpret the seismic data and map the potential reservoir

• select exploration well locations

• drill and evaluate exploration well data

• core analysis to establish porosity and permeability

• logging data to determine porosity, water and hydrocarbon saturation

•

production test data to determine flow rates and maximum production potential• PVT to allow reservoir fluid analysis and ascertain oil/gas quality and the shrinkage or

expansion factor

• build a computer model of the reservoir and identify and where possible remove major

uncertainties by further data analysis, seismic reprocessing etc


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EXPLORATION


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APPRAISAL

Exploration phase of life cycle closely intertwines with thenext stage of processing which is Appraisal . The objective

of Appraisal is to obtain information about the reservoir in

order to make a decision whether or not to proceed with

development of the field. This stage comprises the followingactivities:• planning and execution of a data acquisition programme of additional seismic,

• reprocessing existing seismic data to obtain enhanced results and the drilling of

• appraisal wells

• evaluation of the results from the seismic and appraisal drilling activities

•

using the information from the seismic and drilling programmes to update the computer

reservoir simulation models

• conduct initial conceptual field development planning and an environmental impact

assessment (EIA) study of these conceptual plans


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DEVELOPMENT

The initial phase of field development planning could involvethe assessment of more than one development option. Four

components of a development plan can be used to describe

each option:

•

Reservoir : number, location, type of wells; assessment of oilrecovery 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, dailyproduction level, support requirements, for ex. helicopters, supply

vessels


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DEVELOPMENT


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DEVELOPMENT


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DEVELOPMENT


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DEVELOPMENT


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DEVELOPMENT

D P l E i i


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PRODUCTION PHASE

Production phase is targeted at bringing the well fluids to thesurface and preparing them for use in refinery or processing

plant. All production and maintenance activities would be

carried out to meet strict safety and environmental policies

and procedures . The main activities consist of the following:• 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

•

This could lead to further reservoir development or modifications to the

facilities

• plan and schedule all production and maintenance activities to minimise

production deferment and operating costs

•

carry out maintenance to safeguard the technical integrity of all wells and

facilities and ensure their availability over the life of the field.

D t t P t l E i i


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DEVELOPMENT

D t t P t l E i i


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PRODUCTION PHASE

D t t P t l E i i


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PRODUCTION PHASE

D t t P t l E i i


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PRODUCTION PHASE

D t t P t l E i i


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PRODUCTION PHASE



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PRODUCTION PHASE



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ABANDONMENT PHASE

The end of the life of the field is when it is no longer economic for theoperator to continue production, i.e. when the operating costs exceed

the revenue from the sale of production.

It is becoming increasingly common around the world that offshorefacilities must be dismantled and removed and the site restored to its

original condition. The major activities during the decommissioningphase are:

•

plug and abandon wells by putting cement plugs into the wells at various

depths and remove the well-head and casing to a depth of about 2 metres

below the surface or seabed

• dismantle and remove the jacket and all facilities from the site, ensuring that

there is no contamination of the environment from any oil or waste material

remaining in the process facilities

•

restore the site to its original condition

• conduct a final environmental impact study

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