Online Field-Wide Gas-lift Optimisation (Final)

7/24/2019 Online Field-Wide Gas-lift Optimisation (Final)

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e-petroleumservices.com

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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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



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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



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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


%# 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

Documents

Online Field-Wide Gas-lift Optimisation (Final)