-s * SPE 20037 Phase Behavior Properties of COz/He avy Oil Mixtures for EOR Applic ati ons S, 3, Sayegh, Petroleum Recovery Inst., and M, arbar, Esso Resources Canada SPEMembers SPE Copyright 1990 , ScUWNyof Pe trol eum Er @neer8 Inc, T hi s p ap ar W8S p r ep a red for p re ean ln tlon et Ihe Wth Cal i for ni a Reg io nal M wt ln g h el d InVent ura, C al if or ni a, AN 4-6 1~. Thin papar wae wle cmd for praae rdat ion by an SP E Pr ~ ram C om m it t ee f o ll o wi n g r ev i ew o f I nfor malIon contai ne d i r r a n ab s tr ac t a ub m lt t ed b y t h e a uthor e). Conte nts of Ihe pwar, a 8 p r wa nl ed , have notbeen revie wed by the Society of Pe lrol eu m E’ glne em and ar e e ub ja ct t o c o rr ec t i on by theauthor s). Tha materia l, ae preee nte d, does not naoe aa a ri ly rellect any positionof the SooI e ty of Petroleu m E ng ln ee r a, It aoffl c er ei or memti r a. P ep er a pre w n te d at SP E meetlnga reubjaa 0 publication eview yEdllorlal ommll twa ot the Soal e ty of Pe trot eum Englna era . Permia alon to copy{erest rict ed toan abstra ct ofnot morethanZCKI words. Illuetratbnamay notbe copied.The abstract ahoutdOontalnccmpkxwa i:kmladgmmt o f w he re nd by whom Ihe paper 1 0 pr es en te d, Writ e P ub l l catlona Ma n ag er , W“ E , P, O. Sox 83 3S 3S , Richa rdso n, TX 76 0 8S - 3S 38 . T el ex, 7 30 S 69 S PE DA L, ABsTRAcr The objective of this studyis to measurethe phasebehavior and pnysical propertiesf a Canadim heavy crude oil (llOAPljsaturatedwith carbon dioxide aa a function of pressure and temperature. Thesedatsare usedtoevaluatethefeasibilityf using carbon dioxideas a pretreatmentforsteam floods or as a steamadditive. Experimental measurements were carriedout at 69,@F (21°C),the reservoir temperature, and at 284°F (14@C). Thesaturationressureserebetween 400 ,Jsi (2.8MPa)and 1,500psi(10.3MPa).At each pressure levelthevolubilityf CC+ in theoil, the density,andtheviscosityof the saturated mixture weremeasured, The results showed an increaseinthe volubility of C% in the oil with increasingpressureand decreasing temperature,hilethe densities of the ml.xturesid not changeto a largeextentwith changingcompositions, The most dramaticeffect observedwas the decreaeein vlscoeity with C % issolutionnthe oil: A 53-fold reduction occure at 69.80F(210C)and a 2-foldredu~tion at 2840F (14CPC) SARA analyses of varioussamplea were carried out It waa found that at 69,@F (21°C)some redistribution f asphaltenesnd resinsoccurred at pressuresibovetheiquefactionresaureofC~ (850 pqi or 5.9MPa). These results indicatethat, frov a phase behavior polntof view,enhanccd oil recovety byC02 injection in theheavy oil reservoir is fetiaible, and thatviscosity reduction wouldplaya m~jorrole in improving productivityt lowertemperatures. he asphaltenes/resitls alanceshould be taken into accountwhen stilecting he injection pressure. INTRODUC1’ION Conventional use of C02 for improvingoil recovery has been most y for miscible flood applications where the displacementof crude oil from the pore space within the reservoirsis achieved by the solvent action of CC+whichprevents formation of an interface betweenthe drivingand the drivenfluid, The diapl.acement rocessis very effective and potentially00%of theoil in place couldbe recovered fromthe sweptzone. However, in heavyoiiand biturnenous eservoirs suchmiscibilityannot be obtainedand it willnot be a factorin increasingil recovery.Rather,the enhancementofoilrecovery will be the resultof the highsdubilityofC% in lowAPI8ravityoils which~n turnwouldresult in: (1) A substantialiscosity reduction- 10-fold or morecan he easily achieved. (2) Considerable oil swelling (10-30%) depending on the saturationpressu”, reservoir temperature,nd the crudeoils composition. (3) Improved reservoir energy ‘? after C ? treatment since C gas willcomeouto solution and provde a drivingforceto sweeptheoil out of the reservoir. (4) Theloweringof Interracialension between the oil and the aqueous phases, Also, due to the chemicalreactionsbetween ~% arbonicacid(C + O mixture) and the carbonete portions of t e reservoir rock, in reased permeabillties an be obtainedby C$ injection. Thiscan be usedas a preconditioning rocess prior to steaminjection to improve steaminjectivity.
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20037-Phase Behavior Properties of COHeavy Oil Mixtures for
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7/21/2019 20037-Phase Behavior Properties of COHeavy Oil Mixtures for
Phase Behavior Properties of COz/Heavy Oil Mixtures for
EOR Applications
S, 3, Sayegh, Petroleum Recovery Inst., and M, Sarbar, Esso Resources Canada
SPEMembers
SPE
Copyright 1990, ScUWNyof Petroleum Er@neer8 Inc,
Thi s p ap ar W8Sp rep ared for p re ean ln tl on et Ih e Wth Cal if orni a Reg io nal Mwt ln g h el d In Ven tu ra, Cal if orni a, AN 4-6 1~.
Thin papar wae wlecmd for praaerdation by an SPE Pr~ram Commit tee fo llowing review of Informal Ion contained i r ran abstract aubmlt ted by the author e). Contents of Ihe pwar,
a 8
prwanled, have not been reviewed by the Society of Pel roleum E’g lneem and are eubjact to correct ion by the author s). Tha mater ial , ae preeented, does not naoeaaari ly rel lect
any posi t ionof the SooIe ty of Petroleum Englneera, I taof f lcerei or memti ra. Pepera prewnted at SPE meetlngareubjaa0publicationeviewyEdllorlalomml ltwa ot the Soale ty
of Petroteum Englnaera. Permiaalon to copy{erestricted toan abstract ofnot morethanZCKIwords. I l luetratbna may notbe copied.The abstract ahoutdOontalnccmpkxwa i:kmladgmmt
of where nd by whom Ihe paper 10presented, Wri te Publ lcat lona Manager, W“E, P,O. Sox 833S3S, Richardson, TX 7608S-3S38. Telex, 730S69 SPEDAL,
ABsTRAcr
The objectiveof thisstudyis to measurethe
phasebehaviorandpnysicalpropertiesfa Canadim
heavy crude oil (llOAPljsaturatedwith carbon
dioxideaa a functionof pressureand temperature.
Thesedatsare usedto evaluatethe feasibilityf
usingcarbondioxideas a pretreatmentfor steam
floodsor as a steamadditive.
Experimentalmeasurementswere carriedout at
69,@F (21°C),the reservoirtemperature,and at
284°F(14@C). Thesaturationressureserebetween
400 ,Jsi(2.8MPa)and 1,500psi (10.3MPa).At each
pressurelevelthevolubilityf CC+in theoil,the
density,and theviscosityof the saturatedmixture
weremeasured,
The resultsshowedan increasein thevolubility
of C% in the oil with increasingpressureand
decreasingtemperature,hilethe densitiesof the
ml.xturesid not change to a large extentwith
changingcompositions,
The most dramaticeffect
observedwas the decreaeein vlscoeitywith C
%
issolutionntheoil: A 53-foldreductionoccure
at 69.80F(210C)and a 2-foldredu~tionat 2840F
(14CPC)
SARA analysesof varioussampleawere carried
out
It waa found that at 69,@F (21°C)some
redistributionf asphaltenesndresinsoccurredat
pressuresibovetheiquefactionresaureofC~ (850
pqior 5.9MPa).
These results indicate that, frov a phase
behaviorpolntof view,enhanccdoil recovetybyC02
injectionin the heavyoil reservoiris fetiaible,
and thatviscosityreductionwouldplaya m~jorrole
in improvingproductivityt lowertemperatures.he
asphaltenes/resitls
alanceshould be taken into
accountwhenstilectinghe injectionpressure.
INTRODUC1’ION
Conventionaluse of C02 for improvingoil
recovery has been mostly for miscible flood
applicationswhere the displacementof crudeoil
from the pore space within the reservoirsis
achievedby thesolventactionof CC+whichprevents
formationof an interfacebetweenthe drivingand
thedrivenfluid, The diapl.acementrocessis very
effectiveand potentially00%of the oilin place
couldbe recoveredfromthe sweptzone.
However,in heavyoiiand biturnenouseservoirs
suchmiscibilityannotbe obtainedand it willnot
be a factorin increasingil recovery.Rather,the
enhancementof oil recoverywill be the resultof
the highsdubilityof C% in low API 8ravityoils
which~n turnwouldresultin:
(1)
A substantialiscosityreduction-10-fold
or morecan he easilyachieved.
(2)
Considerable
oil
swelling
(10-30%)
depending
on the saturationpressu”,
reservoirtemperature,nd the crudeoils
composition.
(3)
Improved
reservoir
energy
‘?
after C
?
treatmentsinceC
gas will come out o
solutionand provde a drivingforce to
sweeptheoiloutof thereservoir.
(4)
The loweringofInterracialensionbetween
theoiland theaqueousphases,
Also, due to the chemicalreactionsbetween
~%
arbonicacid(C +
O mixture)and thecarbonete
portions of t e reservoir rock, increased
permeabilltiesan be obtainedby C$ injection.
Thiscan be usedas a preconditioningrocessprior
to steaminjectionto improvesteaminjectivity.
7/21/2019 20037-Phase Behavior Properties of COHeavy Oil Mixtures for