KNOWING THE SUBCOOL IS MORE THAN JUST COOL utilized for reservoir monitoring and artificiallift...
Transcript of KNOWING THE SUBCOOL IS MORE THAN JUST COOL utilized for reservoir monitoring and artificiallift...
Monitor Subcool – Increase Production by 20%
• Monitoring the Subcool provides the ability to boost
output while working in a safe operating range,
protectingyourassets.
Liner Plugging
• Bottomholepressurehelpeddeterminethedrawdown.
This helped determine when the liner was plugging
betweenthereservoirandthewellbore.
Monitor Lower Subcool Valves – Optimize Efficiency
• HighSOR(SteamOilRatio)gaveanexcellentindication
ofreservoirqualityandoperationalefficiency.
OBJECTIVES: Operational data provides the ability to maximize production
whileprotectingthedownholeassets.
GathercriticalperformancedataforthedesignandoperationoffutureSAGDprojects.
AccuratelymonitorsubcooltowardsachievinganoptimalSAGDoperationof0degSubcool.
Real time downhole Pressure / Temperature monitoring protects your assets, and provides information to increase your production.
The ERD™ sensor, accompanied by a custom designed tubing mandrel, isincorporated into thecompletionstringand run into thewellbore– inclusiveof cable andprotectors. The cable exits thewellhead viaapressurebarrierand connects to the MOREVision data acquisition unit. Sensors in thisconfigurationareutilizedforreservoirmonitoringandartificial liftmonitoringandoptimization.
MORET System (Tubing Conveyed)
High Temperature ESP Monitoring
KNOWING THE SUBCOOL IS MORE THAN JUST COOL
Ideal SubCool
“Thebiggestthingthatdownholeinstrumentation(P/T)givesusisthelinersubcool,ameasureoftheamountoffluidinyoursteamchamberabovetheproducerwell.ThebiggestrisktodamagingSAGDwellsisflashingsteamacrosstheliner,whichoccurswhenthefluidthatiscomingintothewelldropstoitssaturationpressureforthetemperatureitisatasitpassesthroughtheliner.Atthispoint,thefluidundergoesaphasechangefromliquidtovapor(steam),thusvelocityincreasessubstantiallyandcanwashoutliners,compromisingabilitytocontrolsand.Linersubcooliscalculatedastheassociatedsaturationtemperaturetotheproducingbottomholepressure,thensubtractingtheproducingbottomholetemperature(tellsyouhowfaryouarefromasaturatedsteamcondition).Forevery10degCoflinersubcool,thisrepresents1meteroffluidaboveyourproducingwell.Optimal(mostefficient)SAGDoperationisat0degCsubcool,howeverduetothenaturethatinstrumentationisnot100%accurate,wellsarenotflat(goupanddown),anddrawdownisnotevenlydistributedalongthewellpath,wetargetaminimumof10degClinersubcool,targeting20degCinthepastduetoourlackofreliabledownholeP/Tmeasurement.Withbetterinstrumentation,wewillpushsubcoolslowerthanwherewecurrentlyoperateasitismoreconservative.”“Bybeingabletoaccuratelyknowbottomholetemperatureandpressure,youcanoperateatlowersubcoolsbecauseyouhavetheconfidencethatyourcalculationsarecorrect.It’stoughtoputa%increaseonit,butattheendofthedayIfyoudon’tknowthesubcool,youoperatemuchmoreconservativelyandthusrequirealotmorewellstogetthesameamountofproduction.Morewellsmeanalotmorecapitalupfront,addedtothefactthatrunningathighersubcoolsislowerefficiencyinthethermalworld(higherSOR-steamoilratio,whichisakeymetricforcomparingeconomicsofdifferentplaysandgivesagoodindicationofreservoirqualityandoperationalefficiency).We’veeasilyhadwellswitha20%productionincreasebeingabletospeedthemupknowingthatyouarestillsafewhereyouareoperating,butotherwellsyoumayfindyouralreadyrunningatlowersubcoolsandseeminimalincrease.”
Customer Revelations
What is Subcool?
A Division of Core Laboratories Canada Ltd.
2100, 125 – 9th Ave S.ECalgary, Alberta+1(403) 571-1669
For more information, please visit our website at:www.promore.com
• Subcoolisthetemperaturedifferencebetweentheinjectedstreamandproducedfluid.
• Keeping production temperature below saturation temperature provides single-phaseflowconditionswhichprovidesmostefficientproduction.
• A controlled method with downhole P/T monitoring can be used to enhance uniformsteamchambergrowthandultimatelymoreoilproductionwithlesssteaminjection.
Optimal Steaming Process
• Distributedinjectionandproduction• Uniformsand-facepressuredistributionandliquidlevel• Limitingsteambreakthroughatproducersorfloodingatinjector
Steam ChamberPc and Tc
HPp , Tp
Tp < Tc Pp = Pc + pgh