Encuentro presencial Zapala-NQN Parte 1. Taller Disciplinar Enseñar Lengua y Literatura con TIC.
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IAGP Neuquen 2008
Production Maintenance in Mature fields
How Monitoring Impacts Production…
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2 - IAGP Neu uen 2008
Introduction
• Mature fields require an intensive monitoring in order to:
Understand the field behavior.
Characterize the reservoir
Detect opportunities to increase production and reserves worovers! stimulations! perforations! loops!
fractures! etc
"d#ust d$namic models to provide accurate production forecasts and #ustif$ new pro#ects
• BU monitoring must !e "arefull# "$osen and follo%ed from t$e ver# !eginning of field
life
• %&o much info ills info' each field re(uires a dedicated monitoring plan
• )perating costs must be ept under control as production is declining get the right data at the right time
• &'am(les of s(e"ifi" monitoring a"tions t$at $ad im(a"t on (rodu"tion and reserves
"guada Pichana* new fracture methodolog$ adapted to heterogeneousl$ depleted reservoir
+an ,o(ue* well performance actions to fill a production gap
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) - IAGP Neu uen 2008
-eu(uen asin / "guada Pichana loc-eu(uen asin / "guada Pichana loc
+CH0M"&IC+CH0M"&IC +0C&I)-+0C&I)-
Neuquen BasinNeuquen Basin
*edimentar# "olumn*edimentar# "olumn$e Aguada Pi"$ana field is lo"ated in t$e Neuqu+n Basin, sout$-%estern
Argentina
$e field (rodu"es gas from t$e sandstones of t$e Mulichinco formation, its
main reservoir
Aguada Pi"$ana is t$e second largest gas field in Argentina
It is develo(ed in t$e eastern flan. of t$e N/-*& trending (ositive stru"ture
"alled $i$uido anti"line
$e Muli"$in"o 1m de(t$s ranges !et%een : 300 4 800 mM5
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"guada Pichana Production Histor$
P,)10M"&IC
• 1ow2Med perm. 2 heterogeneous sands
• +trong natural decline
• Intense drilling campaign 34 to 5 wells per month6• Ne% %ells to%ards t$e /est 7lo% 9
• Ne"essit# of P "om(ression
• om(le' "oordination %it$ multi(le "onstraints
• H$draulic fractures s$stematicall$ re(uired
789:;9mD
7;:<9mD
7<:;mD
=><mD
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How to maintain the production plateau in "P ?
Continuous monitoring actions such as*
@ell tests! Isochronal tests! MD&! P1&! fluid sampling! seismic surve$s
allowed to define*
<. Drilling Campaign eAtensions thans to ade(uate coring program and dedicated 4D
seismic surve$
• infill B delineation wells
• +tep out wells
8. Production )ptimizition B stimulations actions
• MP B 1P compression inline %it$ e'(e"tations t$an.s to an ada(ted monitoring and a
good model $istor# mat"$
• -ew fracture design 3wells without fracture dont produce6
4. uture development pro#ects in "P loc being studied
• 11P compression
• @ell spacing reduction
• 1ow permeabilit$ reservoirs how to produce them economicall$ ?
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"P* racture design optimizationontinuous monitoring a"tions in order to identif# (ossi!le <!ottlene".s of (otential=:
<. Increased average gas rate 3E89F6
8. "ccelerate reserves4. "verage sin 7 :; against :4 previousl$
Monitoring B new fracture design*
•Gas (otential evolution: (rodu"tion tests
•>eservoir (ressure evolution: stati"s gradients ? M5 a"quisition in ever# ne% %ell
•Iso"$ronal test after fra" transmissi!ilit# 4 *.in 4 @f
• $an.s to monitoring, it %as (ossi!le to see t$at some %ells didnt s$o%
t$e e'(e"ted fra"ture !e$avior and t$e "orres(onding (rodu"tivit#
• B# Integrating t$e M5 data 7differential de(letion9 ro". me"$ani"s in
our designs, it %as (ossi!le to o(timiCe t$e treatment %it$ dedicated
fractures to avoid convection and disconnection between frac and
wellbore)ld fracture design
-ew fracture design
Disconnection of frac due to
convection
Perf
•Dig$ Cone
•5e(leted Cone
• o%er Cone
• PressuriCed Cone
Main results
1660
m
MD
1680
1700
1720
NPHI V/V0.45 -0.15000.15
RHOZ G/C31.95 2.952.45
KTIM_G6 MD0.10 100
9.< :4 mD 3avg6
low depletion
4 : <9 mD 3avg6
+trong depletion
1660
m
MD
1680
1700
1720
NPHI V/V0.45 -0.15000.15
RHOZ G/C31.95 2.952.45
KTIM_G6 MD0.10 100
9.< :4 mD 3avg6
low depletion
4 : <9 mD 3avg6
+trong depletion
&$pical MD& G permeabilit$ log in "P
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-eu(uen asin +an ,o(ue loc
P,)10M"&IC
• Intrusive sills* volcanic sills naturall$ fractured
• +hallow sills 311! 4C6* ,ich gas and oil
• Deep sills 3,incon Chico6 * Dr$ gas HP2H&
• +hallow Clastics 3Centenario 2 Mulichinco6
"+, loc as eAport
"+,
11
,Ch
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How to maintain the production plateau in "+, ?
<. Continuous monitoring actions*
• @ell tests! low after flow tests! P1&! etc
8. Production optimization B stimulations actions
• -odal "nal$sis* tubing resizing! loops! etch.
• MP B 1P compression
• )ptimizing selective completions in "+, clastics wells
• "cid stimulation with balls sealers* necessar$ in all filons target
• ,e:perforations 2 re:stimulations with new acids treatments.
4. uture studies in "+, loc• -ew technologies 3batch fracs! new acids! local compression!…6
• Infill targets based on revised and histor$ matched models
• -ew stimulation campaign based on recent success on filones
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"guada +an ,o(ue Clastics* Production )ptimisation 0Aample
Centenario C
Centenario "
Mulichinco
)ptimization* based on good initial data per la$er G pressure
monitoring in neighboring wells! a multi la$er nodal anal$sis
was performed low ris of crossflow and potential productiongain was identified
• est configuration was found 3M G Cent " G Cent C6
• +ignificant production increase was achieved
ain* G <<9 =m4 2d from M G Cent " G Cent C
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+an ,o(ue * another production optimisation eAample
• Incremental production * J9 =+m4 2d
ad tests
MP @)
1P
u!ing $ange
1lo% after flo% PI diagnosis
2 Anal#sis nodal Prod (erforman"e
) /or.over 72 E48= 6 =9
6 >e-(erforation a"id Ho! to !e
done s$ortl#
u!ing "$ange a"id Ho! !all sealers oo(
Add (erforations a"id Ho! !all sealers
2 Anal#sis nodal
) /or.over 72 E48= 6 =9
6 Ne% anal#sis nodal
; oo(
Perf G acid
@)
1oopMP
• Incremental production * K99 =m42d
Due the compleAit$ of the "+, B 11 fields 3filones6! acid #obs with ball sealers are necessar$ in order to
stimulate all the opened fractures. In the same wa$! reperforations #obs enhace access to new fractures.
" t$pical worflow in "+, bloc is*
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+an ,o(ue "ctions* Impact on production profile
L E <.; MMm4 2d
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Conclusions
11 Aguada Pi"$ana:
0Atend production plateau and compensate the strong decline of the field 3599 2 5;9 =m42d ever$ month6
Identif$ new zones of interest 3conventional or not6
Debottlenec surface facilities and well architecture when re(uired
Design a new fracture methodolog$ to increase production and push upwards the recover$ factor
Prepare the future 3new drilling campaigns and2or developments! 11P! spacing reductions6
*an >oque
0Atend the production plateau until 1P compression start up
Debottlenec surface facilities and well architecture when re(uired
-ew stimulations design potential stimulation campaign could be triggered
2 A monitoring (lan is a fundamental (art of a 1ield 5evelo(ment Plan It allo%s to:
• Understand the field! anticipate actions and react in time in an$ situation
• Update our models 3static and d$namic6 for more robust reserves estimates
• Identif$ potential upsides and reduce riss for future pro#ects
$e a"tions "arried out as "onsequen"e of t$e monitoring $ave allo%ed us to:
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