[p.t] well completions and production [jan-2009]
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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&
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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
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APPENDIX
n2550
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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
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