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Kinabalu Development

Project

18 October 2013

Annulus Management Plan

KN Deep Wells

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Presentation Outline

2

Cement Reliability

Cement Stress Analysis

Annulus Fluid Expansion

Comparison of Annulus Management ption

WE!!CA" Modeling

Nitrogen Cus#ion ption

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$% Key ob&e'ti(e is to a'#ie(ereliable isolations acrosshyrocarbon sectionsandprevent gas migrationt#roug#out life'y'le of t#e)ell%

2% *se of premium cementgas tight blens% Rids use

of gas tig#t extended leadand tail%

+% $, ppg 'ement needed tomitigate losses% Extended-'lassi'al. leads/

$% Form (ery lo) 'ompressi(estrengt# 0 tend to fail%

2% Are generally 1uitepermeable for 'ement andare prone to allo)ing gasmigration%

+% "ae a (ery long time to set3t#us3 get damaged duringpressure testing 0 general

)ell operations%

4% Completed cement stress +

"ement %eliability-A. Annulus

-5. Annulus

-C. Annulus

Multiple layersof depleted

sands

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"ement %eliability( "em#$%#MoelingCemS"RESS modeling )as used to simulate 'ement be#a(ior for t#e

)#ole )ell life under (arious 'ombination of temperature and pressure(alues

5ased on CemS"RESS analysis3 cement behin all casings are ableto )ithstan the anticipate loa cases%

Di*erential

Pressure!psi'

+,-.8/ "asing Pacer Depth 10 4t,MD .1200 4t,$5D

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Annulus 6lui &7pansion( &99"A$Moeling

"emperature Modeling using WE!!CA"

Max Surfa'e "emp/ 2$6deg FWell 7rodu'ing at$,,MMSCF8day

$% 9mpa't of Annulus7ressure 5uild *p dueto :uid expansion )asassessed usingMultiString Analysis inWE!!CA"

2% ;ig#est temperaturepro

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Annulus 6lui &7pansion( &99"A$MoelingDesign !imit C#e' @ "rapped Annulus

$@B8.6A:9

$,@+84. x 6@B8.6A:9

$+@+8.6A:9

B@$82. 6A:9

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Annulus 6lui &7pansion( &99"A$MoelingDesign !imit C#e' 5leeded ? Annulus

$,@+84. x 6@B8.PA##

$+@+8.PA##

B@$82.PA##

$@B8. PA##

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Annulus 6lui &7pansion

Annulus

$rappe

&st;6lui

Drop !4t'!at coltemp'

< =itrogen"ushion

psi bbl psi

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KN@Deep Annulus Management

Options Avantages Disavantages

Opt 1( 5leed o?annulus on day today basis

$% Simple and standardpra'ti'e

$% Allo) air ingress into annuli if(al(es open%

2% Rely on #uman+% CanHt measure (olume

returned from )ell%

Opt 2( 5leed o?annulus 0 uponstart up lo' outannulus

$% Simple2% Remo(es relian'e on

#uman+% Remo(es ris air being

dra)n into annuli%

$% No ability to top up annuli2% During inter(ention3 'an

damage t#e )ell%

Opt 3( *se ofa'ti(e gly'ol andN2

$% Remo(es relian'e on#uman

2% Ensures )ell annulipressure 'ompensatedduring )ell 'ooling%

$% Complex system2% 9ndire'tly dependent on #uman

intera'tion for maintenan'e%+% Ris of rapid release of ;C from

tubing to annulus%

Opt ( 5leed o?annulus uponstart up 0 installN2 'us#ion3 t#enlo' out%

$% Remo(es relian'e on#uman

2% Ensures )ell annulipressure 'ompensatedduring )ell 'ooling%

+% !ess 'omplex anddependen'y on

instruments reliability%4% A'ti(ely lo'ing out annuli

$% Annulus 'annot be simplyopened%

6

Annulus Management Options"onsiere 4or K=,>>D !?P?$'

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KN@Deep Annulus Management$,

%ecommenation , =itrogen "ushion

WE!!CA" simulation indi'ates t#at t#ere is no real re1uirement

for Nitrogen Cus#ion in KN@Deep Annulus Management% 9n t#e 'ase of annuli being treated per 'urrent operational

pra'ti'e =bleed o? )#ene(er annulus pressure ex'eed B,, psi>3'asings )ill still remain )it#in t#e design limit%

;o)e(er in a bigger pi'ture t#ere are some ad(antages inpursuing t#is Nitrogen Cus#ion met#od for KN@Deep Wells assuggested belo)/ pportunity for familiariGation and to le(erage on operational

learning 'ur(e prior to KN@**D )ell =;7;" De(elopment>%

"esting p#ase to identify any issues in implementing t#is approa'#%

7ilot pro&e't for 7E"RNAS Carigali and e(aluate t#e e?e'ti(eness

as part of impro(ement initiati(e for )ell integrity%

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KN@Deep Annulus Management $$

Operational Proceure 4or =itrogen "ushion

$% "#e pro'edure )ill re1uire t#e rig up of a '#i'san manifold t#at'onne't t#e 'oiled tubing N2pumping unit to t#e 'ement unit

in&e'tion line and end up in t#e *ni#ead 2 $8$. ill in&e'tion portimmediately belo) t#e tubing #anger

2% During 'leanup :o)3 bleed o? A annulus and 5 annulus t#roug#respe'ti(e '#oe lines3 registering t#e (olumes of t#e returns

+% As soon as t#e )ell is s#ut in3 start in&e'ting N2 t#roug# ill line on A

annulus until a B,, psi in&e'tion pressure is rea'#ed4% S#ut in N2in&e'tion and monitor pressure% 7ressure s#ould de'rease

)#ile t#e )ell is 'ooling do)n%

B% W#en t#e de'rease in registered pressure in t#e annulus rea'#es$,, psi3 start in&e'ting N2 again until pressure rea'#es B,, psi

% Repeat pre(ious step until annulus pressure remain 'onstant at B,,psi%

% ;ando(er )ell to produ'tion

% During )ell produ'tion3 )#en steady state :o) 'onditions arerea'#ed3 pressure in t#e annulus )ill in'rease to (alues abo(e B,,psi% Not bleed o? in t#e annulus is re'ommended3 unless surfa'e

annulus pressures start ex'eeding B3,,, psi% 9n t#is 'ase3 t#einter(ention of t#e Drillin Di(ision s#all be re uested and a )ell

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