Online Field-Wide Gas-lift Optimisation (Final)
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Transcript of Online Field-Wide Gas-lift Optimisation (Final)
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Online Field-Wide Gas-lift
Optimisation
Dr Alasdair S Brown
Technical ManagerEPS Americas Inc
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Presentation Structure
Introduction Single Well vs Field Wide
Online vs Oine
!ase Studies" #atin America
" Middle East
!onclusions
$uestions
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Single Well
Single Well %as#i&t O'timisation" (alve S'acing
" In)ection De'th
" (alve Per&ormance
" %# In)ectionPressure
" $gasli&t
" !*P
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Single Well
!onditions change" %# is inherentl+ ,e-i.le
" Design in ,e-i.ilit+
Single well o'timum
" Well 'er&ormance curve" Di/erent &or each well
" 0ot necessar+ o'timal&or s+stem
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%as #i&t O'timisation
Gas Lift Compressor
Well
Well
Well
Well
Equal Gradients Method
Common Pressure
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Field Wide O'timisation
Field Wide %as #i&t O'timisation" Distri.ution o& %as to com'eting wells
" Pressure losses in gas li&t distri.ution s+stem
" Pressure losses in 'roduction s+stem
" 1!losing the #oo'2 Total system modellingTotal system modelling
" including 'roduced gas rein)ection
" !om'ressor 'er&ormance
" Oine3Online
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Wh+ Online4
#arge 0um.er o& Wells !om'le- o'timisation 'ro.lem
5educe c+cle time
" O'timisation6to6im'lementation
" Engineer7s time concentrated on value adding tas8s
%oals
" Automate Process
" Automate 5e'etitive Tas8s" O'timise
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Sustaina.le Production O'timisation
Time
Increas
edValueOverDoNothing
Simple Manual Optimisation
Complex Manual Optimisation (Oline !"O#
Complex $utomated Optimisation (Online !"O#
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Automation 9 O'timisation O/6line
" Data in'ut manuall+ into s+stem model
" 5esults &rom s+stem model im'lemented manuall+
O'en loo'
" Data in'ut automaticall+ into model &rom S!ADA
" 5esults &rom model im'lemented manuall+
!losed loo'
" Data in'ut automaticall+ into model &rom S!ADA
"5esults &rom model im'lemented automaticall+ viaset 'oint controllers
" O'erator review ma+ .e re:uired to ensure thatim'lemented results are 1sensi.le2
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O/6line O'timisation
Optimiser
FieldOPERATOR$dvice$pprovalImplementation
Manual Data Input Data Output
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O'en #oo' O'timisation
Optimiser
FieldOPERATOR$dvice$pprovalImplementation
$utomatic Data Input Data Output
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!losed #oo' O'timisation
Optimiser
Field
OPERATOR$dvice$pprovalImplementation
$utomatic Data InputDat a
O
ut put
!etpoi"t#o"trollers
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!ase ;< Pd(SA On6#ine
" S!ADA data automaticall+ loaded to give current blockvalveand compressor statusand to constrain theo'timisation to sta+ close to e-isting o'erating conditions
" Price/costand e:ui'ment constraint data loaded &rom!or'orate data.ases
" %as in)ection well set6'oints sent directl+ to S!ADAcontrollers =a&ter 'roduction o'erator review as a .loc8>
" 5ecommended 'ressure control valve set6'oints andcom'ressor o'erating conditions sent to 'roductiono'erators in o'en6loo' advisor+ messages
" 5esults stored in central data.ase &or access .+ othera''lications?
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Pd(SA S+stems Overview
PROCESS CONTROL
CENTRAL CONTROL
OPTIMISATION
CIS
RTU, PLC..
SCADA
ASMS, WTO, NN, OM&S, IS
CENTINELA, SIAL, SICOT..
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Integration Schematic
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Data
%econciliation
D!O
&ell Model
%ecali'ration
"egac(
Data
S(stems
)
ri
m*
Cha
ng
es
N
e
u
r
a
l
N
e
t
s
&
e
l
l
T
e
s
t
S(stem !eometr(
$
SM
S
O
M+
S
Decoupled
CDMS
O"e i$E! !erver per %&
i!,S-'ased
applications
Or'cle("termedi'te
)'t'%'se
Middle.areTransactionServices
SC$D$ ServerSC/ 0
Re'lTime*istor+
SC$D$ ServerSC/ 1
Re'l Time*istor+
)I
2istorian
Crude3&ater
Treatment
+
&ater In4ection
D(namic "ea5Detection
)I Decoupled
rom )%$)
)'t','se
servers#)%
Master
%ecollectors
P(AP(
SC$D$ServerSC/ 6
Re'lTime*istor+Aver'-e
)'t'
Re'l Time
SC$D$ServerSC/ 7
Re'l Time
*istor+
Aver'-e)'t'
O
P
#
$88 Simcon
98C /p%ight ,)S
Valmet
Stoner
O
)
%
#
#
O
.
S+stem Architecture
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Process #o"trol
#e"tr'l #o"trol
Optimis'tio"
#orpor'te !+stems
Pd(SA Online %#O
$/O
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Process #o"trol
#e"tr'l #o"trol
Optimis'tio"
#orpor'te !+stems
The Online%#O A''lication
RT&P/#
Optimiser
)'t','se
!#A)A
("put Output
("put Output
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Online %#O Dail+ O'eration
GLO
GLO is executed...
Gas lift rates and
recommendations download
to SCAA
Gas Lift Well
MiniPlantas
Compressors
!he results aree"aluated...
Appro"al atSuper"isor# le"el
!he SCAA Operator
accepts the $as lift rates
and carries out ad%ustments
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#a Salina Online
!uned Well ModelsGenerate Operatin$ PtWellhead PerformanceCur"eWells in &low$roups&low$roup PerformanceSurfaces'P Gas Lift (etwor)LP Gas Gatherin$
(etwor)Complete (etwor)
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Field Im'lementation 5esults
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POIS
PO(! Productio" Oper'tio" ("orm'tio" !+stem orter" ields o u'it
Perormed ,+ co"sortium i"cludi"- EP! Aspe"tec )'elim
EP! role 's to provide te optimi'tio" sot're sot're i"te-r'tio"'"d det'iled e"-i"eeri"- models or ive ields i" ort u'it
Te ields i"cluded 197 ells :411 ell stri"-s;< 33 'ter i"=ectors< 91 -'s lited producers '"d
< 30 produced it E!Ps
Te ells '"d ields 're co""ected trou- ' comple> "etor? 'lloi"-ells to ,e sitced ,etee" i- medium '"d lo pressure 's ell 's@et '"d @dr+ sep'r'tor tr'i"s
Tot'l productio" 600 .st,d'+
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Design Brie&
*+draulic model o& %# Distri.ution S+stem !om'ressor Station .ehaviour and Per&ormance
" Power tur.ines@ com'ression@ gear.o-es@ intercoolers@ gasrec+cling
" Surge and stonewall constraints
Multi'hase Flow
Scala.le to ; wells
O'timise non6hierarchical networ8s
Online Integration with" Production Management S+stem
" D!S3S!ADA S+stem
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O.)ectives
Data ac:uisition via S!ADA to MIS =As'entech> %# o'timisation &or new %# wells
" %# .eing installed &ollowing water in)ection
Automatic ac:uisition o& WT data
Automatic well model recali.ration
Automatic online %# o'timisation calculation
Manual setting o& o'timised set'oints =initiall+>
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PAS !once't
PA!
eBellTest
BellFloBell .odel
#omp're it
tre"d
E"-i"eeri"terve"tio"
Reru" orretu"e
PO(!
F'il
P'ss
.'"u'l .odel Retu"e
Autom'tic .odel Retu"e
Reru" Belltest
)'t' Tr'"ser
P'st d't'
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%#O !once't
!"O
%eO Sstem Model
PO(!
etor? model
Bells Bells Bells Bells Bells
("iti'te$/O ru"
$et&pd'ted
ell models
$e"er'teell
perorm'"ceRu" $/O
#o"vert toco?e
setti"-s
Ne. SettingsNe. gas allocation
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Im'lementation
Well modelling o& all C;; wells =WellFlo> !onstruction and tuning o& networ8 Model
=5eO>
Automatic tuning o& Well models
Automatic %# o'timisation
Integration with As'entech MIS
Model maintenance and develo'ment
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Im'ortant Issues Identied
Data $ualit+" Well data
" 'roduction data
" Sur&ace networ8 data
Business 'rocesses" .uilding use o& POIS model into std? 'rocedures
" model maintenance
" model enhancement !om'ressor o'timisation
Multistage se'aration o'timisation
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0etwor8 !ong Modelling
Individual elds =vi?@ 5A@ SA@ 5$@ AD 9 B*>modelled as se'arate su.6sheets
Each %! has headers that can ta8e in,ow
&rom an+ or all wells
All elds interconnected through G%athering !entres< %!6;H@ %!6G@ and %!6
H
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0etwor8 !ong Modelling
Multi'le %! 9 MF o'tions &or all the wellsmade networ8 ver+ ,e-i.le to
accommodate an+ &uture ,ow 'ath
denition
O'timiser easil+ handled this huge networ8
6 over C@ o.)ectsJ
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S!ADA 9 POIS
Well 'ead Pressure
&rom *+, WellsGC SCAA GC CS
GC -!
/PO0S1
All CS A!A
!-A(S&E--E-A0O L0(2
PM
AL!AMEE-
/PO0S1
&0(E-WELL 0(&O-MA!0O(
usiness Process Explorer
G30
Well&lo -eo
4
Well&lo
Maintain Well Models
/Administration of1
PAS
'#drocar5on Accountin$
Material alance
GLO
3ser
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To' #evel 0etwor8
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$'dali:
67 &ells
to 0 !C
via 6; 7in lines
%at? &ells
to ; !C
thru 1 M@ each
Sa'riah:
6A0 &ells
to 6 !C thru 1 M@
8ahra:
? &ells
to 6 !C thru 1 M@
;1B producers
.ith choice oproducing into
an o ; !Cs
through an o 06
M@s
0etwor8 !ong Modelling
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5A Field 0etwor8
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"it-!as Sstem
?x1 )ossi'le inputs rom % + $D ields
> Su'-sheets holding 0=-0? .ells each
1x; M@ interconnecting all 6>A .ells
across the ield
1x; M@ outlets to production terminals
"it gas to S$ ield
0etwor8 !ong Modelling
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N) + !".ells (@!#
Multi-header choice or lit-gas
at present + or uture
Multi-M@ choice or production
at present and or uture
0etwor8 !ong Modelling
%# Well Per&ormance Sur&ace
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%# Well Per&ormance Sur&aceData
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!onclusions
KO! currentl+ 'roducing to :uota" !urrent ca'acit+ higher than :uota
=how much higher is un8nown>
" *owever additional 'roduction can .e allocated to 0K
" !ost reduction is additional .enet 5eduction in admin overhead
5eduction in ,aring
Potential reduction in new well re:uirement
0etwor8 reconguration
Wor8 'ractices need to change to e-tract &ullvalue &rom the s+stem
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PO(! pro=ect
#lie"t C u'it Oil #omp'"+ Ie'r o #o"tr'ct A'rd < 2000
Pro=ected J'lue $e"er'tedK< L100 millio" C L175 millio" per '""um :pro=ected;
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$uestions4