Refracture Reorientation

8/20/2019 Refracture Reorientation

1/65

FAST FAST

Project #3

Refracture Reorientation inLenticular Reservoirs

Daniel Benedict


2/65

FAST FAST Project #3: Refracture Reorientation

Outline

Resume` Reorientation theory

Objectives Background odeling

!e"t stes


3/65


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


4/65


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


5/65


Reorientation methods

6he ounds e"eriment8oschovidis' et al' ,---9

0mmediate reorientation 2ilco" sandstone.toka shale


6/65



:rom oschovidis' et al' ,---


7/65FAST FAST Project #3: Refracture Reorientation


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)




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




: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




2hat if this henomenaoccurs in lenticular reservoirsF

6his roject acts on theassumtion that reorientationhas occurred' and studies itsincremental bene7ts



Objectives

*imulate roduction oflenticular sands that haveundergone fracture

reorientation

Perform sensitivity studies onthe inut arameters andanaly>e the results



Lenticular Reservoirs

2hy lenticular reservoirsF

6hese study areas have beenfocused on blanket/tyemarine sands




: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




Image Source: 2uu"raa& 4.5.& “Produced Ma""ive%y Staced 6enticu%ar Sand" of Co%orado7" Piceance a"in&'

8a"9IPS& Spring ;;




5eologic .dvantages *tress 7eld alignment Directional ermeability Reoriented fractures %ould cross

direction of highest ermeability




5eologic 1uestions !atural fractures

Deletion Damage from stress changes Refracturing to ossibly energi>e

matri"




>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-


18/65


odeling

(5 0+H simulator 5C0 interface

Direct editing through )dat 7le as

%ell Po%erful' yet ainless .ble to model naturally fracId

reservoirs


19/65


odeling

(5 Builder 5rid otions PJ6 roerties

5as2ater model otion

Rel Perm' non/Darcy Ko% 2ell events


20/65


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


21/65


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


22/65


odeling


23/65


odeling


24/65


odeling


25/65


odeling


26/65


odeling

Project %asnIt 1uite thatsimle

*o began the rocess ofre7nement and matching


27/65


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


28/65


odeling

Di;erent reservoircharacteristics for lenticularsands are being e"amined)

ultile aroaches tried'%hich 0 %ill discuss)


29/65


odeling

Original model contained onelayer

:racture' matri" in the samesace

Problems encountered in griddingnon/orthagonal fractures 6ransmissibility introduced


30/65


odeling

Dual Porosity modelintroduced :lo% occurred from fracture to

fracture and matri" to fractureonly

Cnderrediction of recovery


31/65


odeling

:inally' Dual Permeabilitymodel alied to scenarios atri"/atri" :lo% atri"/:racture :lo% :racture/:racture :lo%

!atural :racture system

introduced


32/65


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)


33/65


odeling

2ith the natural fracturesystem' ermeability needs tobe scaled do%n)

0n the (5 soft%are

e; = frac M Nfrac total


34/65


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


35/65


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


36/65


odeling

.dditional Parameters

2ell 0nde"' M20 20 = 8,WMkMhM%frac9

8L!8ReR%9*9 Re=geofacM8.reaPWM%frac9T)U

2frac=GX geofac=)3SX skin=-


37/65


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


38/65


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


39/65


ultile fracs' year ,


40/65


*ingle frac' year ,


41/65


ultile fracs' year 3


42/65


*ingle :rac' year 3


43/65


(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


44/65


U-- foot fracture' year ,


45/65


,U- foot fracture' year ,


46/65


U-- foot fracture' year 3


47/65


,U- foot fracture' year 3


48/65


(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


49/65


(ruciform fracture' year,


50/65


3-Y fracture' year ,

if f


51/65


(ruciform fracture' year3


52/65


3-Y fracture' year 3


53/65


(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 -


54/65


,U- foot fracture' -acres

,U- f t f t ,-


55/65


,U- foot fracture' ,-acres

,U- f t f t G-


56/65


,U- foot fracture' G-acres

( i ft G-


57/65



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


58/65


.nisotroy' G&G

i


59/65


.nisotroy' G&G-

i --


60/65


.nisotroy' G&G--

( i ft G-


61/65



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


62/65

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


63/65

FAST FAST


(onclusions

:inal analysis is under%ay

!umerical.nalytical resultse"ected shortly

(riteria for selectioncandidates %ill be discussed

6i li


64/65

FAST FAST


6imeline

January2006

May2006

January 2007 May2007

Literature

Review

Preliminary X X X X XModeling

- -- X XX XSensitivity

Studies X XX XProject

Completion

[uestions and


65/65

FAST

[uestions and(omments

F

Refracture Reorientation

Documents

Transcript of Refracture Reorientation