Oce-1 PVT Final Report B (2)

Reservoir Fluid Study

for

Hocol, S.A.

Ocelote-1 Well

RFL 0703054

Core LaboratoriesCra 39 Nro. 168-52, Bogot, Colombia

Tel: +57 (1) 6740400 Fax: +57 (1) 6730060 Web: http://www.corelab.com

Th e analys e s , opinions or inte rpre tations in th is re portare bas e d on obs e rvations and m ate rials upplie dby th e clie nt to w h om , and for w h os e e xclus ive and confide ntialus e , th is re port is m ade . Th einte rpre tations or opinions e xpre s s e d re pre s e nt th e be s t judge m e nt of Core Laboratorie s Ve ne z ue la,S.A. (alle rrors and om is s ions e xce pte d);but Core Laboratorie s Ve ne z ue la, S.A. and its office rs ande m ploye e s as s um e no re s pons ibility and m ak e no w arranty or re pre s e ntations as to th e productivity,prope r ope ration or profitability of any oil, gas or any oth e r m ine ralw e llform ation in conne ction w ithw h ich s uch re port is us e d or re lie d upon.

Core Laboratorie sCra. 39 Nro. 168-52

Bogot , Colom biaTe l: 57 1 6740400

W e b: h ttp://w w w .core lab.com

Since re ly,CORE LABORATORIES

Sim n Rodrgue zSupe rvis orRe s e rvoir Fluids Laboratory

January 30th , 2007

Pe re nco Colom bia, LTD.Bogota, Colom bia.

Atte ntion : Eng. Jina Martine z Subje ct: Re s e rvoir Fluid Study W e ll: Candalay-1Form ation: Carbone ra C7Inte rval: 6,028' - 6,040'File : 0603147

De ar Eng. Martine z :

Tw o w e llh e ad s am ple s from th e s ubje ctw e llw e re colle cte d on Augus t26th of2006 by CoreLaboratorie s re pre s e ntative s and de live re d to our fluid laboratory in Bogot for us e in th epe rform ance ofa Re s e rvoir Fluid Study. Th e s am ple s w e re trans porte d to th e laboratoryw h e re upon s am ple validation and analys is com m e nce d.

Th e final re port of th e Re s e rvoir Fluid Study is pre s e nte d in th e follow ing page s .

It h as be e n a ple as ure to pe rform th is s tudy for Pe re nco Colom bia, LTD. Sh ould anyq ue s tions aris e or if w e m ay be of furth e r s e rvice in any w ay, ple as e do not h e s itate tocontact us .

April 20th , 2007

H ocol, S.A. Bogot , Colom bia

Atte ntion : Eng. Larry Pre nt Subje ct: Re s e rvoir Fluid Study W e ll: Oce lote -1Form ation: Inte rval: File : 0703054

De ar Sirs .:

Th re e bottom h ole s am ple s from th e s ubje ctw e llw e re colle cte d on De ce m be r 16th of2006by Core Laboratorie s re pre s e ntative s and de live re d to our fluid laboratory in Bogot forus ein th e pe rform ance of a Re s e rvoir Fluid Study.

Initialq uality controlch e ck s w e re pe rform e d as s oon as th e s am ple s w e re re ce ive d and th es tudy proce de d th e re afte r. Pre lim inary data w as trans m itte d e le ctronically during th ecours e of th e s tudy and th e final re port of th is s tudy is pre s e nte d in th e follow ing page s .

Ith as be e n a ple as ure to pe rform th is s tudy for H ocol, S.A. Sh ould any q ue s tions aris e orif w e m ay be of furth e r s e rvice in any w ay, ple as e do not h e s itate to contact us .

H ocol, S.A.Oce lote -1 W e ll_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _RFL 0703054

Table of Conte nts

Section A - Summary of Analysis Methods and PVT Data Page

Summary of analysis methods...................................................................................................... A.1-A.3

Summary of PVT data................................................................................................................... A.4

Section B - Summary of Samples Received and Validation Data

Well information for bottomhole samples..................................................................................... B.1

Summary of samples received...................................................................................................... B.2

Section C - Compositional Analysis of Bottomhole Reservoir Fluid

Compositional analysis of bottomhole sample to C36+................................................................ C.1-C.2

Section D- Constant Composition Expansion (CCE)

Constant composition expansion data at 207 F.......................................................................... D.1

Graph of cons tant com pos ition e xpans ion data at 207 F............................................................ D.2

Se ction E - Diffe re ntial Vaporization

Diffe re ntial vaporiz ation data........................................................................................... E.1Graph s from diffe re ntial vaporiz ation data....................................................................... E.2Diffe re ntial vaporiz ation data conve rte d to s urface s e parator conditions ........................ E.3-E.4

Se ction F - Re s e rvoir Fluid Vis cos ity Data

Re s e rvoir fluid vis cos ity data........................................................................................... F.1

Se ction G - Se parator Te s t Data

Data from s e parator te s t 1............................................................................................... G.1Com pos itional analys is of gas s am ple from s e parator te s t............................................. G.2

Data from s e parator te s t 2............................................................................................... G.3Com pos itional analys is of gas s am ple from s e parator te s t............................................. G.4

Se ction H - Appe ndix

Data us e d in gas com pos itional calculations ................................................................... H .1

Data us e d in liq uid com pos itional calculations ................................................................ H .2

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Se ction A - Sum m ary of PVT Analys is M e th ods and Data



Sum m ary of Analys e s Me th ods

Sam ple ValidationTh e bubble point pre s s ure at am bie nt te m pe rature and fre e w ate r conte nt of e ach bottom h oles am ple w e re de te rm ine d as initialq uality ch e ck s . From th is q uality control, th e m e as ure d bubblepoint pre s s ure s of th e s am ple s s h ow e d good agre e m e nt w ith one anoth e r and ve ry little fre ew ate r w as m e as ure d.

H e at Tre atm e ntTh e s e le cte d bottom h ole fluid s am ple w as h e ate d to 200F prior to s ubs am pling for laboratoryte s ts to avoid pote ntial w ax de pos ition proble m s .

Pre s s uriz e d Fluid Com pos itionApproxim ate ly 30 cc of pre s s uriz e d fluid w as flas h e d to atm os ph e ric pre s s ure at 120 F ands e parate d into its re s pe ctive gas and oilph as e s . Th e e volve d gas and re s idualliq uid w e reanalyz e d s e parate ly, us ing gas -liq uid ch rom atograph y and re com bine d on a w e igh t bas is toproduce a C36+ w e igh t pe rce nt com pos ition.

Gas Com pos itionsGas com pos ition w e re m e as ure d us ing a "one s h ot"Varian 3800 gas analyz e r us ing GPA 2286m e th od. Th e gas ch rom atograph utiliz e s 3 colum ns to cle arly ide ntify allof th e e lute dcom pone nts from N2, CO2 and C1 th rough C11+ .

Th e ch rom atograph is calibrate d w e e k ly us ing air and s ynth e tic h ydrocarbon gas w ith a k now ncom pos ition. Th e re s ultantcalibration data is ch e ck e d s tatis tically agains tpre vious calibrationsprior to pe rform ing analys e s on unk now n s am ple s .

Liq uid Com pos itionRe s idual/s tock tank liq uid com pos ition w e re m e as ure d us ing a Varian 3400 ch rom atograph . Th egas ch rom atograph utiliz e s a cold on colum n, "s andw ich inje ction" te ch niq ue to e ns ure th at are pre s e ntative s am ple is inje cte d and s w e ptonto th e colum n. Th e s am ple is run tw ice ;firs tth eoriginalfluid and th e n fluid s pik e d w ith n-te trade cane . Th is allow s th e laboratory to tak e intoaccountany h e avy e nd (C36+ ) los s e s th atm ay h ave occurre d during th e ch rom atograph ic run,and m ak e an accurate corre ction prior to re porting th e liq uid com pos ition. Th e data obtaine dfrom th e gas ch rom atograph is in w e igh t % . Calculations to m ole % and th e plus fractionsprope rtie s are de s cribe d late r.

Th e ch rom atograph for liq uid s am ple s is ch e ck e d daily, us ing a gravim e tric n-paraffin m ixcontaining a range ofpure com pone nts from C8 th rough C36 and a s ynth e tic gas -oilm ix (D2887)w ith k now n com pos ition. Th e re s ultantcalibration data is ch e ck e d s tatis tically agains tpre viouscalibrations prior to pe rform ing analys e s on unk now n s am ple s .

A.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Sum m ary of Analys e s Me th ods , continuation

Calculation of Mole % Com pos itions and Plus Fraction Prope rtie sTh e re s idue or s tock tank liq uid w h ole s am ple m ole cular w e igh tand de ns ity are m e as ure d us inga crys cope and a PAAR de ns itom e te r re s pe ctive ly.

Th e m ole % data is calculate d us ing GPSA m ole w e igh t and de ns ity data, w h e re individualcom pone nts are ide ntifie d, from carbon dioxide th rough de cane s . Katz and Firooz abadi data areus e d from unde cane s th rough pe ntatriacontane s . Th e re s idue m ole w e igh tand de ns ity value sare calculate d s o th at th e ps e udo ave rage m ole w e igh t and de ns ity are th e s am e as th em e as ure d value s . Th is can le ad to anom alous re s idue m ole w e igh ts and de ns itie s w h e re th eKatz and Firooz abadi value s m ay not be s uitable for th e is om e r groups de te cte d.

Oth e ralte rnative s are to us e an as s um e d C36+ m ole cularw e igh tand de ns ity value , us e a line are xtrapolation te ch niq ue for com pone nts from C10 to C35 to calculate th e C36+ prope rtie s or toutilis e dis tillation analys is to produce a C11+ , C20+ or C36+ re s idualoilfraction and ph ys icallym e as ure th e m ole cular w e igh t and de ns ity.

Cons tant Com pos ition Expans ionA portion ofth e bottom h ole fluid s am ple w as ch arge d to a h igh pre s s ure vis ualce llatam bie ntlaboratory te m pe rature . Th e s am ple w as th e rm ally e xpande d to th e re s e rvoirte m pe rature and acons tant com pos ition e xpans ion w as carrie d out during w h ich th e bubble point pre s s ure atre s e rvoir te m pe rature w as de te rm ine d. Pre s s ure -volum e data for th e s ingle ph as e and tw oph as e fluid w e re als o m e as ure d. Th e de ns ity of th e s ingle ph as e fluid w as de te rm ine d byw e igh ing m e as ure d volum e s pum pe d from th e ce llat 5000 ps ig. De ns ity data for oth e rpre s s ure s w e re calculate d us ing th e volum e tric data.

Diffe re ntial VaporizationTh is w as carrie d outin a h igh pre s s ure vis ualce ll, atre s e rvoir te m pe rature . Ats e ve ralpre s s ures tage s be low th e obs e rve d s aturation pre s s ure , th e s am ple w as s tabiliz e d. Th e gas e s e volve dw e re th e n pum pe d outofth e ce lland its volum e , com pre s s ibility and gravitie s w e re de te rm ine d.Th e finals tage w as carrie d outatatm os ph e ric pre s s ure w h e n th e re s idualliq uid w as pum pe dout of th e ce ll and its volum e , de ns ity and m ole cular w e igh t w e re m e as ure d.



Sum m ary of Analys e s Me th ods , continuation

Re s e rvoir Fluid Vis cos ityLive -oilvis cos ity w as m e as ure d in an e le ctrom agne tic vis com e te r at re s e rvoir te m pe rature .Vis cos ity de te rm inations w e re carrie d outove r a w ide range ofpre s s ure s from above th e re s e rvoirpre s s ure to atm os ph e ric pre s s ure .

Th e m e as ure m e nts w e re re pe ate d ate ach pre s s ure s tage untilfive orm ore re s ults agre e d to w ith in0.5% . Th e de ns itie s , obtaine d from th e cons tant com pos ition e xpans ion and diffe re ntialvaporiz ation te s ts , w e re us e d in th e calculation of vis cos itie s in ce ntipois e .

Se parator Te s tsFinally, tw o s ingle -s tage s e parator te s ts w e re carrie d outus ing a pre s s uriz e d te s ts e parator ce ll. Aportion ofth e bottom h ole fluid s am ple , ata pre s s ure above s aturation pre s s ure , w as pum pe d intoth e s e parator ce lland s tabiliz e d at th e pre s s ure and te m pe rature re q uire d for th e firs t s tages e paration. Th e gas e volve d w as pum pe d outof th e ce lland th e volum e and com pos ition w e rede te rm ine d. Th e finals tage w as carrie d outatatm os ph e ric pre s s ure and s e parator te m pe ratureand th e de ns ity of th e re s idual liq uid w as de te rm ine d.



Sum m ary of PVT Data

Cons tant Com pos ition Expans ion at 173 F

Saturation pre s s ure (bubble -point) 167 ps ig

Ave rage s ingle ph as e com pre s s ibility 5.73 x 10 -6 ps i-1(From 1630 ps ig to 167 ps ig)

Th e rm al e xpans ion at 5000 ps ig 1.049 0 vol / vol(Vol at 173F)/(Vol at 60F)

Diffe re ntial Vaporization at 173 F

Solution gas -oil ratio at s aturation pre s s ure 20 s cf/bbl of re s idual oil at 60F

Re lative oil volum e at s aturation pre s s ure 1.054 vol / vol of re s idual oil at 60F

De ns ity at s aturation pre s s ure 0.8782 g cm -3

Re s e rvoir Fluid Vis cos ity at 173 F

Vis cos ity at re s e rvoir pre s s ure 9 .447 ce ntipois e at 1630 ps ig

Vis cos ity at s aturation pre s s ure 8.078 ce ntipois e at 167 ps ig

Se parator Te s t Data

Pre s s ure Te m pe rature Form ation Volum e Total Solution Stock tank O il(ps ig) (F) Factor Gas -oil ratio De ns ity at 60 F

(Bl s at/bbl) (s cf/bbl) (g cm -3)

Te s t 1167 173 1.041 19

70 850 60 0.9 19 7

Te s t 2167 173 1.042 19

20 850 60 0.9 201



Se ction B - Sum m ary of Sam ple s Re ce ive d and Validation Data



Re porte d W e ll and Sam pling Inform ation

Re s e rvoir and W e ll Inform ation

Fie ld......................................................................... Oce loteW e ll.......................................................................... Oce lote -1Re s e rvoir Fluid......................................................... Black O il Form ation.................................................................Curre nt Re s e rvoir Pre s s ure .................................... 1645 ps iaRe s e rvoir Te m pe rature ............................................ 173 F

Ins tallation................................................................ *DST.......................................................................... *Pe rforate d Inte rval .................................................. *

Sam pling Inform ation

Date s am ple d........................................................... 16-De c-06Tim e s am ple d ..........................................................Type of s am ple s ....................................................... Bottom h oleSam pling com pany................................................... Core Laboratorie sSam pling De pth ....................................................... 4127 ft. MD

Ch ok e ....................................................................... *Status of w e ll............................................................ Sh ut-in

Bottom h ole pre s s ure ................................................ *Bottom h ole te m pe rature ........................................... *

W e llh e ad pre s s ure ................................................... *W e llh e ad te m pe rature .............................................. *

Se parator pre s s ure ................................................. *Se parator te m pe rature ............................................ *

Pre s s ure bas e .......................................................... 14.7 ps iaTe m pe rature bas e ................................................... 60 F

Se parator gas rate ................................................... *Se parator oil rate ..................................................... *Se parator gas -Oil ratio............................................. *W ate r flow rate .......................................................... *Gas gravity (Air = 1)................................................. *Supe rcom pre s s ibility factor...................................... *H 2S.......................................................................... *BS& W ....................................................................... *API O il Gravity ........................................................ *

Com m e nts : * Data not provide d to Core Laboratorie s

18:15 - 19 :45 H rs .

B.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Sum m ary of Sam ple s Re ce ive d

Bottom h ole Sam ple sLaboratory

Sam ple Cylinde r Sam pling :- Bubble point :- Fre e w ate r Sam pleNum be r Num be r Pre s s ure Te m p. Pre s s ure Te m p. draine d Volum e BSW

(ps ia) (F) (ps ig) (F) (cc) (cm 3) (% )

1.1 59 423D 178 67

1.2 89 6612C 240 71

1.3 818411 19 1 73

Note s :

Bottom h ole Sam ple 1.3 w as s e le cte d for com pos itonal analys is and PVT s tudy.

B.2_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Se ction C - Com pos itional Analys is of Bottom h ole Re s e rvoir Fluid


H ocol, S.A.Oce lote -1 W e ll_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _RFL 0703054

Com pos itional Analys is of Bottom h ole Sam ple to C36 plus

Com pone nt Mole % W e igh t %H 2 H ydroge n 0.00 0.00

H 2S H ydroge n Sulph ide 0.00 0.00CO2 Carbon Dioxide 0.08 0.01N2 Nitroge n 0.10 0.01C1 Me th ane 7.00 0.42C2 Eth ane 0.10 0.01C3 Propane 0.02 0.00iC4 i-Butane 0.04 0.01nC4 n-Butane 0.01 0.00C5 Ne o-Pe ntane 0.00 0.00iC5 i-Pe ntane 0.17 0.05nC5 n-Pe ntane 0.04 0.01C6 H e xane s 0.9 5 0.31 M-C-Pe ntane 0.53 0.17 Be nz e ne 0.03 0.01 Cycloh e xane 0.23 0.07

C7 H e ptane s 2.30 0.86 M-C-H e xane 2.06 0.75 Tolue ne 0.02 0.01

C8 Octane s 4.72 2.01 E-Be nz e ne 0.35 0.14 M/P-Xyle ne 0.45 0.18 O-Xyle ne 0.16 0.06

C9 Nonane s 3.9 4 1.88 1,2,4-TMB 0.38 0.17

C10 De cane s 4.23 2.24C11 Unde cane s 4.11 2.25C12 Dode cane s 3.9 4 2.37C13 Tride cane s 4.79 3.13C14 Te trade cane s 4.57 3.24C15 Pe ntade cane s 4.81 3.69C16 H e xade cane s 4.11 3.40C17 H e ptde cane s 3.75 3.31C18 Octade cane s 4.07 3.81C19 Nonade cane s 3.49 3.42C20 Eicos ane s 3.14 3.22C21 H e ne icos ane s 2.80 3.03C22 Docos ane s 2.51 2.86C23 Tricos ane s 2.31 2.74C24 Te tracos ane s 2.11 2.60C25 Pe ntacos ane s 1.9 2 2.46C26 H e xacos ane s 1.75 2.34C27 H e ptacos ane s 1.67 2.33C28 Octacos ane s 1.55 2.24C29 Nonacos ane s 1.48 2.21C30 Triacontane s 1.35 2.09C31 H e ntriacontane s 1.21 1.9 4C32 Dotriacontane s 1.02 1.68C33 Tritriacontane s 0.9 3 1.60C34 Te tratriacontane s 0.81 1.42C35 Pe ntatriacontane s 0.72 1.30

C36+ H e xatriacontane s Plus 7.17 25.9 4_ _ _ _ _ _ _ _ _ _Totals : 100.00 100.00Note : 0.00 m e ans le s s th an 0.005.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia

C.1

H ocol, S.A.Oce lote -1 W e ll_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _RFL 0703054

Com pos itional Analys is of Bottom h ole Sam ple to C36 plus

Calculate d Re s idue Prope rtie s

C7 plus Mole % 9 1.49Mole cular W e igh t (g m ol-1) 29 1De ns ity at 60F (g cm -3) 0.9 160

C11 plus Mole % 72.09Mole cular W e igh t (g m ol-1) 337De ns ity at 60F (g cm -3) 0.9 384

C20 plus Mole % 34.45Mole cular W e igh t (g m ol-1) 483De ns ity at 60F (g cm -3) 0.9 9 86

C36 plus Mole % 7.17Mole cular W e igh t (g m ol-1) 9 71De ns ity at 60F (g cm -3) 1.2073

Calculate d W h ole Sam ple Prope rtie s

Ave rage m ole w e igh t (g m ol-1) 268De ns ity at 60F (g cm -3) 0.9 067

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia

C.2


Se ction D- Cons tant Com pos ition Expans ion (CCE)



Constant Composition Expansion at 173F

Single-phase Fluid Properties

Saturation pressure (bubble-point pressure) 167 psig

Thermal expansion factor of single phase fluid at 5000 psig(Vol at 173F)/(Vol at 60F) 1.0490 vol / vol

Average single phase compressibility(From 1630 psig to 167 psig) 5.73 x 10 -6 psi-1

Density at saturation pressure 0.8782 g cm-3

Mean Single-phase Compressibilities

Pressure Range MeanInitial Pressure Final Pressure Compressibility

(psig) (psig) (psi-1) (1)

5000 4000 4.41 x 10 -6

4000 3000 4.59 x 10 -6

3000 1630 4.91 x 10 -6

1630 167 5.73 x 10 -6

(1) Mean compressibility = (V2-V1) / [(V1+V2)/2] x 1/(P1 - P2)

D.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Constant Composition Expansion at 173F

Pressure Relative Density Instantaneous Y-Function (3)(psig) Volume (1) (g cm-3) Compressibility

(psi-1 x 10-6) (2)

5000 0.9762 0.8996 4.334000 0.9805 0.8957 4.493000 0.9850 0.8916 4.712000 0.9898 0.8873 5.011630 Reservoir pressure 0.9917 0.8856 5.171000 0.9950 0.8826 5.52900 0.9955 0.8821 5.60800 0.9961 0.8816 5.68700 0.9967 0.8811 5.77600 0.9973 0.8806 5.86500 0.9978 0.8801 5.97400 0.9984 0.8796 6.08300 0.9991 0.8790 6.20200 0.9997 0.8785 6.28167 Saturation pressure 1.0000 0.8782160 1.0080159 1.0092156 1.0131154 1.0159152 1.0188149 1.0235 4.685140 1.0395 4.414122 1.0843 3.906101 1.1691 3.37376 1.3546 2.82949 1.7841 2.362

(1) Relative Volume = V / Vsat ie. volume at indicated pressure per volume at saturation pressure.(2) Instantaneous compressibility = (V2-V1) / V1 x 1/(P1-P2)'(3) Y-function = (Psat - P ) / ((Pabs)(V/Vsat - 1)).



Graphs of Constant Composition Expansion Data

Relative Volume vs Pressure

Y Function vs Pressure

0.9 70

0.9 75

0.9 80

0.9 85

0.9 9 0

0.9 9 5

1.000

1.005

0 1000 2000 3000 4000 5000 6000

Pre s s ure (ps ig)

Rel

ativ

e Vol

ume,

V/V

sat

2.000

2.500

3.000

3.500

4.000

4.500

5.000

0 20 40 60 80 100 120 140 160

Pre s s ure (ps ig)

Y-F

unct

ion



Se ction E - Diffe re ntial Vaporization



Diffe re ntial Vaporis ation at 173F

Solution Re lative Re lative De viation Gas Incre m e ntalPre s s ure Gas -Oil Oil Total De ns ity Factor Form ation Gas Gravity

(ps ig) Ratio Volum e Volum e (g cm -3) (Z ) Volum e (Air = 1.000)Rs (1) Bod(2) Btd(3) Factor (4)

167 20 1.054 1.054 0.8782 Saturation Pre s s ure80 10 1.051 1.384 0.879 0 0.9 9 4 0.18785 0.7220 0 1.048 0.879 8 0.786

At 60F = 1.000

Re s idual Oil Prope rtie s

De ns ity of re s idual oil 0.9 220 g cm -3 at 60F

API 21.8

(1) GOR in cubic fe e t of gas at 14.70 ps ia and 60F pe r barre l of re s idual oil at 60F.(2) Volum e of oil at indicate d pre s s ure and te m pe rature pe r volum e of re s idual oil at 60F.(3) Volum e of oil plus libe rate d gas at indicate d pre s s ure and te m pe rature pe r volum e of re s idual oil at 60F.(4) Volum e of gas at indicate d pre s s ure and te m pe rature pe r volum e at 14.70 ps ia and 60F.

E.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Graph s of Diffe re ntial Vaporization

Solution Gas -Oil Ratio v Pre s s ure

Re lative O il Volum e v Pre s s ure

0

5

10

15

20

25

0 20 40 60 80 100 120 140 160 180

Pre s s ure (ps ig)

Gas

-Oil

Rat

io (s

cf /

bbl

)

1.044

1.046

1.048

1.050

1.052

1.054

1.056

0 20 40 60 80 100 120 140 160 180

Pre s s ure (ps ig)

Rel

ativ

e Oil

Vol

ume (

V/V

r)



Diffe re ntial Vaporization Data Conve rte d to Production Se parator Conditions

Oil Solution Form ation Gas Form ationPre s s ure De ns ity Gas /Oil Volum e Volum e

(ps ig) (g cm -3) (s cf / bbl) Factor FactorRs (1) Bo(1) Bg(2)

5000 0.89 9 6 1.0164000 0.89 57 1.0213000 0.89 16 1.0252000 0.8873 1.0301630 Re s e rvoir pre s s ure 0.8856 1.0321000 0.8826 1.0369 00 0.8821 1.036800 0.8816 1.037700 0.8811 1.038600 0.8806 1.038500 0.8801 1.039400 0.879 6 1.039300 0.879 0 1.040200 0.8783 1.041167 Saturation pre s s ure 0.8782 19 1.04180 0.879 0 9 1.038 0.18785

Note s :

(1) Diffe re ntial data corre cte d to s urface s e parator conditions of :-

Stage 1 70 ps ig and 85FStage 2 0 ps ig and 60F

Rs = Rs fb - (Rs db - Rs d) x (Bofb / Bodb)

Bo = Bod x (Bofb/Bodb)

(2) Volum e of gas at indicate d pre s s ure and te m pe rature pe r volum e at 14.70 ps ia and 60F.



Diffe re ntial Vaporization Data Conve rte d to Production Se parator Conditions

Oil Solution Form ation Gas Form ationPre s s ure De ns ity Gas /Oil Volum e Volum e

(ps ig) (g cm -3) (s cf / bbl) Factor FactorRs (1) Bo(1) Bg(2)

5000 0.89 9 6 1.0174000 0.89 57 1.0223000 0.89 16 1.0262000 0.8873 1.0311630 Re s e rvoir pre s s ure 0.8856 1.0331000 0.8826 1.0379 00 0.8821 1.037800 0.8816 1.038700 0.8811 1.039600 0.8806 1.039500 0.8801 1.040400 0.879 6 1.040300 0.879 0 1.041200 0.8783 1.042167 Saturation pre s s ure 0.8782 19 1.04280 0.879 0 9 1.039 0.18785

Note s :

(1) Diffe re ntial data corre cte d to s urface s e parator conditions of :-

Stage 1 20 ps ig and 85FStage 2 0 ps ig and 60F

Rs = Rs fb - (Rs db - Rs d) x (Bofb / Bodb)

Bo = Bod x (Bofb/Bodb)

(2) Volum e of gas at indicate d pre s s ure and te m pe rature pe r volum e at 14.70 ps ia and 60F.



Se ction F - Re s e rvoir Fluid Vis cos ity Data



Reservoir Fluid Viscosity Data at 173F

Pre s s ure O il Calculate d Oil/Gas(ps ig) Vis cos ity Gas Vis cos ity Vis cos ity

(cP) (cP) (1) Ratio

5000 14.2264000 12.6563000 11.2012000 9 .8881630 Re s e rvoir pre s s ure 9 .4471000 8.767500 8.314167 Saturation pre s s ure 8.07880 8.724 0.0125 69 8.30 9 .49 0

Re s e rvoir Fluid Vis cos ity v Pre s s ure at 173F

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

0 1000 2000 3000 4000 5000 6000

Pre s s ure (ps ig)

Visc

osit

y (c

P)

F.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Se ction G - Se parator Te s t Data



Data from Se parator Te s t 1

Gas -Oil Gas -Oil Oil Form ation Se paration Gas GravityPre s s ure Te m pe rature Ratio Ratio De ns ity Volum e Volum e of flas h e d gas

(ps ig) (F) Rs fb (g cm -3) Factor Factor (Air = 1.000)(1) (2) Bofb (3) (4)

167 173 - 19 0.8782 1.041 Saturation Pre s s ure

70 85 15 15 0.9 049 1.017 0.677 *0 60 4 4 0.9 19 7 1.000 0.707


De ns ity of re s idual oil 0.9 19 7 g cm -3 at 60F

API 22.2

Note :

* Evolve d gas colle cte d and analys e d to C11+ .

(1) GOR in cubic fe e t of gas at 14.70 ps ia and 60F pe r barre l of oil at indicate d pre s s ure and te m pe rature .(2) GOR in cubic fe e t of gas at 14.70 ps ia and 60F pe r barre l of s tock tank oil at 60F.(3) Volum e of s aturate d oil at 167 ps ig and 173F pe r volum e of s tock tank oil at 60F.(4) Volum e of oil at indicate d pre s s ure and te m pe rature pe r volum e of s tock tank oil at 60F.

G.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Compositional Analysis of Separator Test Gas to C11+

Sampling Date 12-Apr-2007Sample Description Ocelote-1 - 70psi Sep Test - First Stage GasCylinder Number 818411Sampling Conditions 70.0 psig @ 85.0FComments

Component Mole % Weight %H2 Hydrogen 0.00 0.00H2S Hydrogen Sulphide 0.00 0.00CO2 Carbon Dioxide 2.83 6.35N2 Nitrogen 2.40 3.43C1 Methane 89.56 73.28C2 Ethane 2.41 3.70C3 Propane 0.21 0.47iC4 i-Butane 0.36 1.07nC4 n-Butane 0.05 0.15iC5 i-Pentane 0.30 1.10nC5 n-Pentane 0.04 0.15C6 Hexanes 0.29 1.27C7 Heptanes 0.35 1.79C8 Octanes 0.87 5.07C9 Nonanes 0.31 2.03C10 Decanes 0.02 0.14C11+ Undecanes + 0.00 0.00

______ ______Totals : 100.00 100.00Note: 0.00 means less than 0.005.Calculated Residue Properties Mole Weight Density

(g mol-1) (g cm-3 @ 60F )C7+ Heptanes plus 114.1 0.7067C8+ Octanes plus 118.2 0.7117C10+ Decanes plus 134.0 0.7780C11+ Undecanes plus - -

Calculated Whole Gas PropertiesReal Relative Density 0.6789 (Air=1 @ 14.73 psia & 60F)Whole Sample Mole Weight 19.61 g mol-1Real Gas Density 0.8317 kg m-3 @ 15CIdeal Gross Calorific Value 1092.6 BTU.ft-3 @ 14.73psia, 60FIde al Ne t Calorific Value 9 88.1 BTU.ft-3 @ 14.73psia, 60FPseudo Critical Press. 668.5 psiaPseudo Critical Temp. 367.1 RankineGas Compressibility Factor, Z 0.9971 @ 14.73 psia & 60FGas Vis cos ity 0.011 cPGPM (C2+) 1.863GPM (C3+) 1.222



Data from Se parator Te s t 2

Gas -Oil Gas -Oil Oil Form ation Se paration Gas GravityPre s s ure Te m pe rature Ratio Ratio De ns ity Volum e Volum e of flas h e d gas

(ps ig) (F) Rs fb (g cm -3) Factor Factor (Air = 1.000)(1) (2) Bofb (3) (4)

167 173 - 19 0.8782 1.042 Saturation Pre s s ure

20 85 17 17 0.9 059 1.016 0.69 1 *0 60 2 2 0.9 201 1.000 0.706


De ns ity of re s idual oil 0.9 201 g cm -3 at 60F

API 22.1

Note :

* Evolve d gas colle cte d and analys e d to C11+ .

(1) GOR in cubic fe e t of gas at 14.70 ps ia and 60F pe r barre l of oil at indicate d pre s s ure and te m pe rature .(2) GOR in cubic fe e t of gas at 14.70 ps ia and 60F pe r barre l of s tock tank oil at 60F.(3) Volum e of s aturate d oil at 167 ps ig and 173F pe r volum e of s tock tank oil at 60F.(4) Volum e of oil at indicate d pre s s ure and te m pe rature pe r volum e of s tock tank oil at 60F.



Compositional Analysis of Separator Test Gas to C11+

Sampling Date 12-Apr-2007Sample Description Ocelote-1 - 20psi Sep Test - First Stage GasCylinder Number 818411Sampling Conditions 20.0 psig @ 85.0FComments

Component Mole % Weight %H2 Hydrogen 0.00 0.00H2S Hydrogen Sulphide 0.00 0.00CO2 Carbon Dioxide 2.91 6.40N2 Nitrogen 1.94 2.71C1 Methane 88.74 71.10C2 Ethane 3.17 4.76C3 Propane 0.26 0.57iC4 i-Butane 0.38 1.10nC4 n-Butane 0.06 0.17iC5 i-Pentane 0.33 1.19nC5 n-Pentane 0.05 0.18C6 Hexanes 0.37 1.59C7 Heptanes 0.42 2.10C8 Octanes 0.96 5.48C9 Nonanes 0.34 2.18C10 Decanes 0.07 0.47C11+ Undecanes + 0.00 0.00

______ ______Totals : 100.00 100.00Note: 0.00 means less than 0.005.Calculated Residue Properties Mole Weight Density

(g mol-1) (g cm-3 @ 60F )C7+ Heptanes plus 114.4 0.7084C8+ Octanes plus 118.7 0.7140C10+ Decanes plus 134.0 0.7780C11+ Undecanes plus - -

Calculated Whole Gas PropertiesReal Relative Density 0.6936 (Air=1 @ 14.73 psia & 60F)Whole Sample Mole Weight 20.02 g mol-1Real Gas Density 0.8498 kg m-3 @ 15CIdeal Gross Calorific Value 1120.9 BTU.ft-3 @ 14.73psia, 60FIde al Ne t Calorific Value 1014.4 BTU.ft-3 @ 14.73psia, 60FPseudo Critical Press. 668.9 psiaPseudo Critical Temp. 372.0 RankineGas Compressibility Factor, Z 0.9969 @ 14.73 psia & 60FGas Vis cos ity 0.011 cPGPM (C2+) 2.258GPM (C3+) 1.414



Se ction H - Appe ndix



Data Us e d in Gas Com pos itional Calculations

Com pone nt Mole W e igh t De ns ity Com pone nt Mole W e igh t De ns ity(g m ol-1) (g cm -3 at 60F) (g m ol-1) (g cm -3 at 60F)

H ydroge n * 2.016 N/A 33DMC5 * 100.20 0.69 54Oxyge n/(Argon) ** 31.9 9 9 1.1410 Cycloh e xane * 84.16 0.7827Nitroge n (Corre cte d) ** 28.013 0.8086 2MC6/23DMC5 * 100.20 0.69 17Me th ane ** 16.043 0.29 9 7 11DMCYC5/3MC6 * 9 9 .20 0.7253Carbon Dioxide ** 44.010 0.8172 t13DMCYC5 * 9 8.19 0.7528Eth ane ** 30.070 0.3558 c13DMCYC5/3EC5 * 9 9 .20 0.7262H ydroge n Sulph ide ** 34.080 0.8006 t12DMCYC5 * 9 8.19 0.7554Propane ** 44.09 7 0.5065 H e ptane s (nC7) * 100.20 0.6875i-Butane ** 58.123 0.5623 22DMC6 * 114.23 0.69 9 4n-Butane ** 58.123 0.5834 MCYC6 * 9 8.19 0.7740Ne o-Pe ntane * 72.15 0.59 68 ECYC5 * 9 8.19 0.7704i-Pe ntane ** 72.150 0.6238 223TMC5/24& 25DMC6 * 114.23 0.7060n-Pe ntane ** 72.150 0.6305 ctc124TMCYC5 * 112.21 0.751122DMC4 * 86.18 0.6529 ctc123TMCYC5 * 112.21 0.757423DMC4/CYC5 * 78.16 0.7129 Tolue ne * 9 2.14 0.87342MC5 * 86.18 0.6572 Octane s (nC8) * 114.23 0.70633MC5 * 86.18 0.6682 E-Be nz e ne * 106.17 0.8735H e xane s (nC6) * 86.18 0.6631 M/P-Xyle ne * 106.17 0.867122DMC5 * 100.20 0.6814 O-Xyle ne * 106.17 0.8840M-C-Pe ntane * 84.16 0.7533 Nonane s (nC9 ) * 128.26 0.721224DMC5 * 100.20 0.6757 De cane s *** 134 0.778223TMC4 * 100.20 0.69 47 Unde cane s *** 147 0.789Be nz e ne * 78.11 0.8820 Dode cane s *** 161 0.800

Data Source Re fs :

* ASTM Data Se rie s Publication DS 4B (19 9 1) - Ph ys ical Cons tants of H ydrocarbon and Non-H ydrocarbon Com pounds .

** GPA Table of Ph ys ical Cons tants of Paraffin H ydrocarbons and Oth e r Com pone nts of Natural Gas , GPA 2145-9 6.

*** Journal of Pe trole um Te ch nology, Nov 19 78, Page s 1649 -1655. Pre dicting Ph as e Be h aviour of Conde ns ate /Crude O il Sys te m s Us ing M e th ane Inte raction Coe fficie nts - D.L. Katz & A. Firooz abadi.

Note :Th e gas m ole % com pos itions w e re calculate d from th e m e as ure d w e igh t % com pos itions us ingth e m os tde taile d analys is re s ults , involving as m any ofth e above com pone nts as w e re ide ntifie d.Th e re porte d com pone nt m ole % com pos itions w e re th e n s ub-groupe d into th e ge ne ric carbonnum be r com pone nts .

H.1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Data Us e d in O il Com pos itional Calculations

Com pone nt Mole W e igh t De ns ity Com pone nt Mole W e igh t De ns ity(g m ol-1) (g cm -3 at 60F) (g m ol-1) (g cm -3 at 60F)

H ydroge n * 2.016 N/A Unde cane s *** 147 0.789H yd. s ulph ide ** 34.080 0.8006 Dode cane s *** 161 0.800Carbon Dioxide ** 44.010 0.8172 Tride cane s *** 175 0.811Nitroge n ** 28.013 0.8086 Te trade cane s *** 19 0 0.822Me th ane ** 16.043 0.29 9 7 Pe ntade cane s *** 206 0.832Eth ane ** 30.070 0.3558 H e xade cane s *** 222 0.839Propane ** 44.09 7 0.5065 H e ptade cane s *** 237 0.847i-Butane ** 58.123 0.5623 Octade cane s *** 251 0.852n-Butane ** 58.123 0.5834 Nonade cane s *** 263 0.857i-Pe ntane ** 72.150 0.6238 Eicos ane s *** 275 0.862n-Pe ntane ** 72.150 0.6305 H e ne icos ane s *** 29 1 0.867H e xane s ** 86.177 0.6634 Docos ane s *** 305 0.872Me -cyclo-pe ntane * 84.16 0.7533 Tricos ane s *** 318 0.877Be nz e ne * 78.11 0.8820 Te tracos ane s *** 331 0.881Cyclo-h e xane * 84.16 0.7827 Pe ntacos ane s *** 345 0.885H e ptane s ** 100.204 0.6874 H e xacos ane s *** 359 0.889M e -cyclo-h e xane * 9 8.19 0.7740 H e ptacos ane s *** 374 0.89 3Tolue ne * 9 2.14 0.8734 Octacos ane s *** 388 0.89 6Octane s ** 114.231 0.7061 Nonacos ane s *** 402 0.89 9Eth yl-be nz e ne * 106.17 0.8735 Triacontane s *** 416 0.9 02Me ta/Para-xyle ne * 106.17 0.8671 H e ntriacontane s *** 430 0.9 06Orth o-xyle ne * 106.17 0.8840 Dotriacontane s *** 444 0.9 09Nonane s ** 128.258 0.7212 Tritriacontane s *** 458 0.9 121-2-4-T-M-be nz e ne * 120.19 0.879 7 Te tratriacontane s *** 472 0.9 14De cane s ** 142.285 0.7334 Pe ntatriacontane s *** 486 0.9 17

Data Source Re fs :

* ASTM Data Se rie s Publication DS 4B (19 9 1) - Ph ys ical Cons tants of H ydrocarbon and Non-H ydrocarbon Com pounds .

** GPA Table of Ph ys ical Cons tants of Paraffin H ydrocarbons and Oth e r Com pone nts of Natural Gas GPA 2145-9 6.

*** Journal of Pe trole um Te ch nology, Nov 19 78, Page s 1649 -1655. Pre dicting Ph as e Be h aviour of Conde ns ate /Crude O il Sys te m s Us ing M e th ane Inte raction Coe fficie nts - D.L. Katz & A. Firooz abadi.

Note :Th e re s idue m ole w e igh t and de ns ity value s ( e g h e ptane s plus , unde cane s plus , e icos ane s plus ) are calculate d s o th atth e calculate d ave rage m ole w e igh ts and de ns itie s corre s pond w ith th e m e as ure dvalue s . Th is can le ad to anom alous re s idue m ole w e igh ts and de ns itie s w h e re th e Katz andFirooz abadi value s m ay not be s uitable for th e is om e r groups de te cte d.

H.2_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Core Laboratorie sBogot , Colom bia


Report prepared by Report approved by

David McEvoy Simn RodrguezProject Manager SupervisorReservoir Fluid Laboratory Reservoir Fluid Laboratory


Oce-1 PVT Final Report B (2)

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Transcript of Oce-1 PVT Final Report B (2)