Post on 07-Aug-2018
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FAST FAST
Project #3
Refracture Reorientation inLenticular Reservoirs
Daniel Benedict
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FAST FAST Project #3: Refracture Reorientation
Outline
Resume` Reorientation theory
Objectives Background odeling
!e"t stes
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Researcher Biograhy
$ometo%n& Longmont' (O B)*c) in Petroleum +ngineering
from (* in ,--, (ordillera +nergy Partners
.ssociate +ngineer / (olorado
Baker $ughes 0nte1 L2D2D +ngineer 4 5ulf ofe"ico
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6heory of Reorientation
Revie% reorientation
6%o tyes of reorientationoccur 0mmediate stress 7eld changes
through fracture and closure *tress 7eld changes over time
through ressure dra%do%n
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Reorientation methods
6he ounds e"eriment8oschovidis' et al' ,---9
0mmediate reorientation 2ilco" sandstone.toka shale
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Reorientation methods
:rom oschovidis' et al' ,---
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Reorientation methods
6he reservoir stress 7eld is alteredthrough the roduction of oil andgas over time)
6he coinciding ore ressure droincurred in the reservoir %illchange the local e;ective stress7eld of the reservoir' making
refracturing ossible)
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Reorientation methods
0n tight sands' theroduction comesfrom an ellitical
area around thefracture
+ncounter byassed
ay that the ellisedoes not roduce
Image Source: Devon Energy Corporation “Mid-ear !peration" Report and arnett S$a%e Sc$oo%&' () *+, ())(
$ttp:media.corportate-ir.netmedia/fi%e"a"edvnpre"entation"ne0pre"S%ide1).jpg
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Reorientation methods
:ractureroagatesuntil virgin
ressure>one isreached
0mage *ource& Devon +nergy (ororation ?id/ @ear Oerations Reort and Barnett *hale*chool'A ,- C! ,--,' htt&media)corortate/ir)netmedia7lesasedvnresentationsne%res*lideE-)jg
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Reorientation methods
2hat if this henomenaoccurs in lenticular reservoirsF
6his roject acts on theassumtion that reorientationhas occurred' and studies itsincremental bene7ts
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Objectives
*imulate roduction oflenticular sands that haveundergone fracture
reorientation
Perform sensitivity studies onthe inut arameters andanaly>e the results
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Lenticular Reservoirs
2hy lenticular reservoirsF
6hese study areas have beenfocused on blanket/tyemarine sands
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Lenticular Reservoirs
:luvial sands have far less areale"tent' and in some cases' like inthe Piceance and 5reen River'
micro/Darcy ermeability
5reat verticallateral
discontinuity Do%nsaced to G- acres in some
areas
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Lenticular Reservoirs
Image Source: 2uu"raa& 4.5.& “Produced Ma""ive%y Staced 6enticu%ar Sand" of Co%orado7" Piceance a"in&'
8a"9IPS& Spring ;;
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Lenticular Reservoirs
5eologic .dvantages *tress 7eld alignment Directional ermeability Reoriented fractures %ould cross
direction of highest ermeability
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Lenticular Reservoirs
5eologic 1uestions !atural fractures
Deletion Damage from stress changes Refracturing to ossibly energi>e
matri"
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Lenticular Reservoirs
>igure (: 6oren?& *.C.& et al .:'>racture C$aracteri"tic" and Re"ervoir e$avior of Stre""-Sen"itive >racture Sy"tem" in
>%at-6ying 6enticu%ar >ormation"&' paper SPE @(== pre"ented at t$e +nconventiona% 8a" 9ec$no%ogy
Sympo"ium& 6oui"vi%%e& 2entucy& 1-( May ;1A.6auBac$& S.E.:'5ttriBute" of fracture net0or" in "e%ected
Cretaceou" "and"tone" of t$e 8reen River and San *uan a"in"&' Geological studies relevant to horizontal drilling:
examples from western North America& Rocy Mountain 5""ociation of 8eo%ogi"t"& Denver& Co%orado ;;( A-
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odeling
(5 0+H simulator 5C0 interface
Direct editing through )dat 7le as
%ell Po%erful' yet ainless .ble to model naturally fracId
reservoirs
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odeling
(5 Builder 5rid otions PJ6 roerties
5as2ater model otion
Rel Perm' non/Darcy Ko% 2ell events
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odeling
:irst stes 0ntroduce a fracture to the
system (onstruct a cruciform fracture
set in the reservoir Build fracture model at other
angles ermeability' transmissibility
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odeling isstes
M!DE6 C!MPRESS.PSI
P!R!SI9&
PERM& MD 5RE5& 5CRES
>R5CF56>-
6E,89F&>9
a"e 3*10^-6 0.12 0.02 80 500
Cruciform 3*10^-6 0.12 0.02 80 500
=@G a"e 3*10^-6 0.12 0.02 80 500
=@G 6entic. 3*10^-6 0.12 0.01 33 250
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odeling
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odeling
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odeling
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odeling
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odeling
Project %asnIt 1uite thatsimle
*o began the rocess ofre7nement and matching
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odeling 2ith Lessistakes
M!DE6 P!R& >R5CP!R&
M59RIHPERM&
MD
>R5CPERM& MD
E>>.PERM&
MD
5RE5& 5CRES
E66I,DEH
Hf& >9
a"e 0.10 .00234 0.008 10000 2.63 40 263 250
Cruciform 0.10 .00234 0.008 10000 2.92 40 293 250
3)GJorigina% 0.10 .00234 0.008 10000 3.49 40 350 500
3)GJorigina% 0.10 .00234 0.008 10000 2.92 20 758 250
3)GJorigina% 0.10 .00234 0.008 10000 2.92 10 758 250
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FAST FAST Project #3: Refracture Reorientation
odeling
Di;erent reservoircharacteristics for lenticularsands are being e"amined)
ultile aroaches tried'%hich 0 %ill discuss)
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odeling
Original model contained onelayer
:racture' matri" in the samesace
Problems encountered in griddingnon/orthagonal fractures 6ransmissibility introduced
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odeling
Dual Porosity modelintroduced :lo% occurred from fracture to
fracture and matri" to fractureonly
Cnderrediction of recovery
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odeling
:inally' Dual Permeabilitymodel alied to scenarios atri"/atri" :lo% atri"/:racture :lo% :racture/:racture :lo%
!atural :racture system
introduced
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odeling
!atural fractures in the dualermeability model
:racture system and matri"system oerate concurrently' butsearately' in the same sace'
and on di;erent lanes' %ithindeendent arameters)
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odeling
2ith the natural fracturesystem' ermeability needs tobe scaled do%n)
0n the (5 soft%are
e; = frac M Nfrac total
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FAST FAST Project #3: Refracture Reorientation
odeling
Nfrac = Jtf Jbulk Jtf = Lres M $res M 2res M 82nf nf sacing9
Jhf
:or simulation Jnf = 833IMGEIM33I9M8)--GQ-ISI9 Jnf = 3QS3)3S ftT3
Jbulk = G)UQEGQMG-TS ftT3
Nfrac = )--,3 JhfJbulk
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odeling
frac = G- Darcies to simulatein7nite conductivity
:cd = 2fMf fmMHf :or simulation
:cd = 8)GMG-9 8EMG-T/Q M ,U-9 :cd = U-- /V essentially in7nite
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odeling
.dditional Parameters
2ell 0nde"' M20 20 = 8,WMkMhM%frac9
8L!8ReR%9*9 Re=geofacM8.reaPWM%frac9T)U
2frac=GX geofac=)3SX skin=-
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odeling
. semi/analytical solution hasalready been develoed to testnumerical solutions for an
in7nite/slab reservoir' 8(raig',--Q9)
0n7nite conductivity desirable foreasiest match %ith analyticalsolution
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6he *cenarios
. %orking model is in lace' 0am adjusting sensitivities forthe follo%ing arameters&
.sect ratios !umber of fractures :racture orientation :racture half/length :racture conductivity Reservoir area
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ultile fracs' year ,
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*ingle frac' year ,
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ultile fracs' year 3
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*ingle :rac' year 3
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FAST FAST Project #3: Refracture Reorientation
(omarison after G-years
M!DE6 5rea&acre"
8a"produced&
mm"cf
8a"remaining&
mm"cf
E>>.PERM&
MD
E66I,DEH
Hf& >9
Sing%e >rac 10 136.01 42.344 2.92 758 500
3)GJorigina% 10 147.29 31.061 3.49 906 500
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U-- foot fracture' year ,
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,U- foot fracture' year ,
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U-- foot fracture' year 3
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,U- foot fracture' year 3
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(omarison after G-yearsM!DE6 5rea&
acre"8a"
produced&mm"cf
8a"remaining&
mm"cf
E>>.PERM&
MD
E66I,DEH
Hf& >9
3)GJorigina% 10 147.029 31.061 3.49 906 500
3)GJorigina% 10 143.73 34.496 2.92 758 250
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(ruciform fracture' year,
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3-Y fracture' year ,
if f
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(ruciform fracture' year3
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3-Y fracture' year 3
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(omarison after G- years
M!DE6 5rea&acre"
8a"produced&
mm"cf
8a"remaining&
mm"cf
E>>.PERM&
MD
E66I,DEH
Hf& >9
;)GJorigina% 40 536.23 892.17 2.92 293 250
3)GJorigina% 40 461.67 966.06 2.92 293 250
,U- f t f t -
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,U- foot fracture' -acres
,U- f t f t ,-
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,U- foot fracture' ,-acres
,U- f t f t G-
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,U- foot fracture' G-acres
( i ft G-
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(omarison after G-yearsM!DE6 5rea&
acre"8a"
produced&mm"cf
8a"remaining&
mm"cf
E>>.PERM&
MD
E66I,DEH
Hf& >9
3)GJorigina% 40 461.67 966.06 2.92 293 250
3)GJorigina% 20 239.13 117.79 2.92 758 250
3)GJorigina% 10 143.73 34.496 2.92 758 250
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.nisotroy' G&G
i
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.nisotroy' G&G-
i --
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.nisotroy' G&G--
( i ft G-
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(omarison after G-yearsM!DE6 5rea&
acre"8a"
produced&mm"cf
8a"remaining&
mm"cf
5ni"otropy E66I,DEH
Hf& >9
3)GJorigina% 10 143.73 34.496 1:1 758 250
3)GJorigina% 10 155.54 22.623 1:10 758 250
3)GJorigina% 10 156.42 21.795 1:100 350 250
( l i
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FAST FAST
Project #3: Refracture Reorientation
(onclusions
Refracture reorientation hasbeen theori>ed' studied insimulation' and roved ossible
Reorientation in lenticularreservoirs has not been studied
6he model has been enhanced
to simulate changes in reservoirvariables
( l i
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Project #3: Refracture Reorientation
(onclusions
:inal analysis is under%ay
!umerical.nalytical resultse"ected shortly
(riteria for selectioncandidates %ill be discussed
6i li
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Project #3: Refracture Reorientation
6imeline
January2006
May2006
January 2007 May2007
Literature
Review
Preliminary X X X X XModeling
- -- X XX XSensitivity
Studies X XX XProject
Completion
[uestions and
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FAST
[uestions and(omments
F