casing design part 2
TRANSCRIPT
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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