What is an Oilwell

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What is an Oilwell?


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Your idea.


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Where to drill?

?

?

?

??

? ??


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Finding Oil - SEISMIC

Seismic model


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From seismic to drilling

Government

offers blocksto oil company

Oil company studiesthe prospect. Calls

for seismic.

Seismic companyshoots seismic

survey

Oil companycalls for bids to

drill well

Drillingexploration

well

Oil companyevaluates the result

- YES, production

- NO: redo,relinquish, farm out?

Oil company (&government) own theraw seismic data

Seismic companyprocess seismic data

Oil company studiesthe final seismic datafor drilling decision

Oil company (&government) ownthe final seismicdata

The whole cycle can take 3-10 years..


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BUILDING an OILWELL


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Drilling Rig
http://updates.spe.org/wp-content/uploads/2007/07/nomad-rig-kca-web.jpg


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hydrocarbon

Conductor casingpiled inConductor casing36in, 30in, 24 in,..Preventing cave-in

How an Oilwell Looks Like


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hydrocarbon

Drilling fluid (MUD)

1) Cleaning upcuttings

2) Lubricating drill bit

3) Well control

Formation does exert pressure!

What can happen when it is not

controlled?

Hydrostatic pressure, formula:

Mud system


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hydrocarbon

Cementing (WellServices)

Surface casing20in, 13 3/8in, Protecting fresh water

zone


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hydrocarbon

Intermediate casing9 5/8 in, 7in, Sealing off trouble zones

Drilling &

Measurement
http://www.slb.com/content/services/drilling/imaging/provision.asp?


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hydrocarbon

Production casing7in, 41/2in Production!

WirelineBasic measurements:

- Gamma ray

- Caliper

- Neutron

- Resistivity

- Sonic


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hydrocarbon

Will it flow? For how

long? What is the

pressure?

What hydrocarbon?

What quality?

Is it economical?

TESTING


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hydrocarbon

Completion

Completing the

well to produce Monitor &

control the wellproductionduring its life
http://www.slb.com/content/services/completion/reslink/lineslot.asp?


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Artificial Lift

Reservoir pressures do not sustainacceptable flow rates orincapable of

producing fluid flow at all.

When water cut increases and/or the

Reservoir Pressure declines over time.

Artificial Lift Application

Beam Pump

PCP

Jet (Hydraulic)

Gas Lift

ESP System

Flow Rate BBl /day

0 500 1,000 10,000

Good to Excellent Fair to Good Poor, not Recommended


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What can happen during production?

SCALE

Oil

water productionCasing

corrosion

Sand

production

Cement bond

deterioration

Remember that driling phase vs production

phase is 1-3 months vs 20-50 years!

Reservoir

depletion..


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STIMULATION (WS) Cleaning up scales with

chemicals (eg. acids)

Controlling sand production

Bypassing damage withFRACTURING

COILED TUBING (WS)


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Cased hole services (WL)

Analysis behind casing

Production logging

CBL / USIT / Isolation scanner
http://www.slb.com/content/services/evaluation/scanner/index.asp?


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From the birth through the lifetime of the well..

SIS: various softwares to optimize well performance From geology to geophysics, petrophysics, borehole geology, mapping,

modeling and visualization, drilling, economic planning,

DCS: expert interpretation and engineering services

throughout the E&P cycle, from exploration to asset divestiture


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In the field, what you imagine vs what you might see:

Road to work


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The Rig

Not shown in picture:

temperature 49 C


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The Activities

Documents

What is an Oilwell