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4a

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UNIVERSTTIPETRONAS

GOURSE : PAB2094WELLCOMPLETIONSNDPRODUCTIONDATE i 14MAY2009 THURSSDAY)TIME : 9.00AM- 12.00NOON 3HOURS)

INSTRUGTIONSO CANDIDATES1. AnswerFIVE 5)outof SIX 6)questionsrom heQuestion ooklet.2. BeginEACHanswer n a newpage n heAnswerBooklet.3. lndicate learly nswershatarecancelled,f any.4. Where pplicable,how leady teps aken narriving t hesolutionsnd

indicate LL assumptions.5. Do notopen hisQuestion ooklet ntil nstructed.

Note': i. There are THIRTEEN13) pages n this QuestionBookletincludinghecover age ndAppendices.

ii. Graph apers reprovided.-Universiti Teknologi PETRONAS

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3:d$3]

a.. Well Jimmy-3 is producing at stabilized flow1450bbl/daywith a flowingbottom-horeressureofaverageeservoir ressures2720psi.conditions of2350 psi. The

i l1.

Determine roductivityndex.

i i . What s heAbsolute penFlowpotential?[2 marks]

[2 marks]RelationshiplpR) curveon the

rate by usingVogel's

[4 marks]curve for P,7 of

[10marks]

Draw he lnflowperformanceprovided raphpaper.

Cafculate he maximumoil productionequation.

Plot the Inflow performanceRelationship1600 si ,1200 si ,800 si,400 siandOpsi .

b.[2 marks]

A reservoirsproducingt stabre onditions ith he oilowing ata:Averageeservoir ressure,,= 1600psiFfowing ottom-holeressure, p,f= 1000psiBubble ointpressure,F 1600 siStabilizedlow ate, o=150bbl/day

il .

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PAB2094

MyanmarOi l and Gas Enterprise asdrilledan oil well n an oil field. t wasfound that there were two productive ones in this well. lt is required oaccomplish ottom-hole ompletionsn order to providecommunicationsbetween eservoirs nd boreholeand up to the surface.The information nthese wo productive ones s listed n TABLEQ2.

TABLEQ2Productive

Zone DepthBottom-hole

PressureType

of FluidSpecific

Gravityof FluidZone 1 7000 t. 2300psi oil 0.76Zone 2 7100 t. 2350psi oil 0.79

Packer, Side Pocket Mandrel,Landing Nipple, down-hole plug, andSubsurface afetyValves SSSV)are providedor wellcompletion. ropose,sketch,abeland ustify he ypeof wellcompletionor the ollowing cenario:a. Producing ellfluid romZone1 only.

[6 marks]b. Producing ellfluid romZone1 and Zone2 simultaneously.

[7 marks]Producing ellfluld romZone2 only.

[7 marks]

5&

3

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3.

PAB2094

a. Sketch typicaligureof gravel ackingn a well.LabelTHREE 3)keyelements nd show heproducedluidpaths.

[5 marks]You have to evaluate he suitabilityof Gas Lift (GL) and ElectricSubmersiblePump (ESP) artificial ift systems for a new offshoredevelopment, s input to the overall ield development lan. ListSEVEN 7) criticalactorswhicheffect heselection f eachartificialifttypes.

[7 marks]

For an oil flowingwell, it is required o install a surface systemconsistingfwellheadandX-mas reeassembly.

ListEIGHT 8)components hichare ncludedn this system.[4 marks]

Explain hepurposes f anyTWO(2)of thesecomponents.[4 marks]

b.

il .

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, t t "* : ,, ; ' .! 4. A well n a reservoirs completedwith 4 inches ubing o a depthof 6000 t.

Theproducedluid s oi lwithgas iquid atioof 400scf/bbl. hereservoir ndcompletion ataare abulatedn TABLEQ4.

TABLEQ4Depth f tubing 6000 tAverage eservoir ressure 2700psiaProductivityndex, 1 linear) 2.3b/d/psiWellhead ressure, ,y, 160psiTubing iameter 4 inchesOi lcut 100o/oOilAPlgravity 35'APl

Using he GilbertChartattached n the APPENDIX1, constructheinflowperformanceelationshipurveand ntakepressure urve.

[10marks]b. Fromanswern part(a),determinehe operating oint.

[4 marks]Discuss he effect of depletion n reservoirpressure owards theoperatingate.Explain ouranswerwithappropriateraph.

[6 marks]

a.

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5.

PAB2094A reservoirs initiallyundersaturatedhen production egins.The pressurethendropsbelow he bubblepointpressure, a.Reservoir nd welldataaretabulatedn TABLEQ5.

TABLEQ5AverageReservoir ressure,{ 3000psiaOilviscosity,o,r 0.68 POilformationolumeaclor, on 1.2resbbl/stbReservoirhickness,t 60f tWellboreadius 0.4 tExternaladius, " 2000 tPermeability 30mDSkin actor,S 0Bubble ointpressure, 6 2000psia

Calculatehe ollowinga. The lowrate t the bubble ointpressuta,80. [6 marks]

relationship

[8 marks]The lowrateor a flowingbottomhole ressure,.1of:

2500psi.[3 marks]

t i ,' i'; ,:ar.:i ,ti,?::.ai:jirj: ! : .,iI{ , ,J.|"tttjii*.:**::*i:*ilrj

b. The maximum lowrate,q*., if the inflow performancebelow he bubblepoint s described yVogel'sequation

6

i i . 1000 si.[3marksJ

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6.

PAB2094

A gas lift is planned o be installed n Alpha Reservoir o increase heproduction rate. TABLE QG shows the properties of this reservoir.APPENDIX showsa pressureraverse urveused nthegas if tdesign.

TABLE Q6Tubing ize 3.958nRequired roductionate 3000STB/dayOi lcut 100o/oGas oil ratio 100scf/bblGas specific ravity 0.65Average lowing emperature 150'FReservoir rod ctivityndex 4 bpd/psiReservoir epth 10000tReservoir ressure 3400psiLiftgas njection radient 20 psi/1000tMinimumlowingubingheadpressure 250psiDeadoil density 35"APlor 0.368psi/ftBrine ensity 0.44psi/ftLiftgas njectionate 3 MMscf/d

Assume hat he well s closed n withdeadoil in the tubingand brine n thecasing/tubingnnulus.

Does hiswell require rtificialift o produce?[4 marks]

b. Fora single ift valve nstallation,eterminehe settingdepth or thegas iftvalve n order o achievehe required roduction?

[10marks]

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APPENDIX

9

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.G-c(t)c36

7

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); i ::

e -r , " : * ; - j.,i .:i :, . ;

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APPENDIX

n2550

,4i?. .4 .

:'l

:.aI'i

l

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APPENDIX

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j

APPENDIXPressure raverse

oPt234567I

c9O3,0a1ro 12

13141516171B1920

Pressure,00PS|G20 24 28 3? 36

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APPENDIX

P,ro,19#['"r' *^rh -t'")P"-P*r 4#lnl+s

F-P,y=U#["#.t)

*='-,'(+)-"[?)'

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