Basic of Well Completion

BASIC WELL

COMPLETION

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PRESENTATION OUTLINE

1) Well Completion Design Criteria

2) Surface Equipments

3) Subsurface Accessories

4) Artificial Lift

5) Q & A

6) Quiz

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WELL COMPLETION DESIGN CRITERIA

What is well completion ?

An activities and methods necessary to prepare a well

for the production of oil and gas

Reason of having well completion ?

To provide communication between reservoirs and

surface.

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Why well completion is so important ?

Main factor to ensure optimum production and recovery to

meet economic requirement.

To ensure safe production operations (mech.+human) over the field life.

WELL COMPLETION DESIGN CRITERIA

(cont’)

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WELL COMPLETION DESIGN CRITERIA

Open Hole Screen Perforated casing Without Casing

4 types of well completion

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SURFACE EQUIPMENTS

Wellhead & X-mas Tree

Crown Valve

Wings Valve Master Valve

Lower Master Valve

Choke

Wellhead

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SUBSURFACE ACCESSORIES

Objectives of subsurface completion

accessories?

To provide access to the reservoir for

surveillance requirement and well stimulation.

To provide mechanical control to the conduit

for safe transfer of the reservoir fluids to the

surface.

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COMPLETION ACCESSORIES

The typical accessories

used in well completion:

Tubing Hanger

Subsurface Safety Valve

(with control line)

Sliding Sleeve Door (SSD)

Blast Joint

Production Packer

Flow Coupling

Side Pocket Mandrel (SPM)

Landing Nipples

No-go Nipple

Production casing

Perforation

Tubing

Tubing hanger

SCSSV

Landing/Seating

nipple

SSD

Wireline Entry

Guide

1/4” control line

Gaslift mandrel

(Side pocket mandrel)

Flow coupling

Dual packer

Blast joint

No-go nipple Single packer

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COMPLETION ACCESSORIES

Tubing Hanger:

To provide a seal between tubing &

wellhead.

To support tubing.

Tubing hanger

Flow coupling

Flow Coupling:

To protect from internal erosion caused

by high velocity & turbulence flow

resulted from ID reduction of another

completion accessories, i.e. SCSSV

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Subsurface Safety Valve:

To prevent uncontrolled

formation flow from

wellbore to surface by

manipulating hydraulic

line from surface

Surface Controlled

Subsurface Safety

Valve (SCSSSV)

Gas lift Mandrel @

Side Pocket

Mandrels

Gas Lift Mandrel (GLM):

A place for installed gas lift valve for

artificial lift purposes.

COMPLETION ACCESSORIES

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Sliding Side Doors (SSD): To enable communication

between tubing & annulus to

enable circulation or

production of fluid.

To equalize tubing pressure &

annulus pressure.

Landing Nipples:

To provide receptacle to locate, lock &

seal subsurface flow controls

equipment.

Landing

Nipples

Sliding Side

Doors (SSD)

COMPLETION ACCESSORIES

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Production Packers: To provide a seal between the outside of

tubing & the inside of the production

casing or liner.

To protect the casing from pressure &

produced fluids.

To isolate multiple production zones.

To eliminate or reduce pressure surging

or heading.

To hold kill fluids in the annulus.

To permit the use of certain artificial lift

methods.

Production

Packers

COMPLETION ACCESSORIES

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Blast Joint:

BJ To protect from external

erosion or damage caused by

the jetting fluid of the zone

perforations.

COMPLETION ACCESSORIES

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ARTIFICIAL LIFT

What is artificial lift ?

Is a method to assist wells to sustain flow of

oil to surface at adequate rates.

When do we need artificial lift ?

When the reservoir pressure is insufficient to

sustain flow of oil to the surface as a result of

increased water cut and/or pressure depletion.

Why do we need artificial lift ?

To increase production.

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GAS LIFT PRINCIPLES:

The injected gas aerates the fluid column

& reduce the density of the fluid.

As the gas moves up the tubing, it

expands providing the scrubbing action to

bring the fluid column to surface.

With the density of the column reduced,

less reservoir pressure is required to push

the liquid to surface.

In other words, the hydrostatic back

pressure to the reservoir is reduced & the

reservoir pressure can overcome this

reduced pressure & initiates the well to

flow.

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Q & A

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QUIZ

1) What is the objective of well completion ?

To provide communication between

reservoirs and surface.

2) Why do we need artificial lift ?

To increase production.

3) From the diagram, please show:

SCSSV

Blast Joint

SSD

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WELLHEAD & X-MAS TREE

Single X-Mas Tree Dual X-Mas Tree