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IAGP Neuquen 2008

Production Maintenance in Mature fields

How Monitoring Impacts Production…



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



) - 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



6 - IAGP Neu uen 2008

"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$ ?


http://slidepdf.com/reader/full/3-iapg-nqn-presentacion 6/133 - IAGP Neu uen 2008

"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



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



+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*



+an ,o(ue "ctions* Impact on production profile

L E <.; MMm4 2d



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:

3 - iapg nqn presentacion

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