Good

Poor

Reduced perform

ance3- A

rm3-A

rm4 A

rmO

ptionalS

pringbowR

ollerE

asy Entry

Roller

Wide A

rms

CENTRALISATION

Vertical W

ellsH

ighly Deviated W

ellsH

orizontal Wells

Barefoot C

ompletions

Com

binations of lar ge casing small tubing

Suspected dam

aged casingH

eavy Duty C

entralisation

ECCENTRING

KnuckleJoint

CC

L tool run in large casingW

eight bars requiredW

ell deviation over short radiusM

ultiple diameter changes in short distance

MISCELLANEOUS

Sw

ivelH

eadM

otorisedS

hockJoint

Tension

Sw

ivelA

bsorber

Multi-finger Im

aging Tools

Stabilisation of flow

meter rotation (cable torque)

Toolstring orientation im

portantC

ablehead load information required

Tool protection during shooting operations

Tools deployed on C

oiled Tubing

NOTES

The tools that norm

ally require centring are Fluid F

low &

Identification tools. Additionally tools that m

easure the casing or tubing i.d. m

ay also need centralising. Centralisers diam

eters are matched to the body size of the tools w

ith the total num

ber required estimated from

the toolstring weight.

CC

L response is best if these are run eccentred. In the case of high pressure wells w

here weight bars are required to

assist the tools enter the well a rigid toolstring needs excessive centralisation and these are therefore best run eccentred.

Knuckle Joints provide toolstring flexibility to allow

part of a string to be centred & the rest eccentred. T

wo joints should

always be used &

these should be separated by a tool whose position does not m

atter, e.g. Gam

ma R

ay.

GU

IDE

TO

DE

PLO

YM

EN

T T

OO

L SE

LE

CT

ION