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CASING DESIGN

PART 2

REF: DRILLING ENG’G. BY NEAL ADAMS

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WELL PLANNINGCONSIDERATION

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CASING PHYSICALPROPERTIES

• GRADE

• WEIGHT

•

RANGE• DIAMETER

• BURST RATING/RESISTANCE

•

COLLAPSE RESISTANCE• PIPE BODY YIELD STRENGTH

(Tension/Axial Load esis!an"e#

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enera as ng es gnCriteria

• Casin$ s!in$s ae %s%all& desi$ned'o !e 'ollo)in$ "ondi!ions*

 –  +%s!

 – "olla,se

 – !ension

 – Biaxial e-e"!s

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Graphical Techniques

• Ga,i"al ,i,e sele"!ion is !e .os!)idel& %sed .e!od 'o ,i"in$,o,e )ei$!s0 $ades0 and se"!ion

len$!s o' "asin$1 A $a,i"ale,esen!a!ion o' !e i.,osed loadsis ,e,aed 'o +%s!0 "olla,se0 and

!ension

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Surface Casing

•  Te 2s! s!in$ o' ,i,e %n in!o !e )ell!a! .%s! +e desi$ned is %s%all& !es%'a"e "asin$1 Tis desi$n in3ol3es !e

%se o' all !e desi$n ,o"ed%es0in"l%din$+%s!0 "olla,se0 !ension0 and +iaxiale3al%a!ion1 Unlie all o!e ,i,e desi$ns0)i" ae %s%all& "on!olled +& !e +%s!

loadin$0 surface casing is mostcommonly controlled by both burstand collapse loading.

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B%s! Desi$n

• LOADS TO BE CONSIDERED

 – SUR4ACE PRESSURE/BURST LOAD

 – BAC5UP /4ORMATION 4LUIDS

 – RESULTANT

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Exa.,le

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COLLAPSE DESIGN

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COLLAPSE DESIGN

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• S!%d& !ension and +i6axial e-e"! 'onex! .ee!in$ dis"%ssion1 (Ca,!e 77and 78#

• Sol3e ,o+le.s 7819 and 781: ,a$e;89