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Microgel Technology for Water Shutoff Applications Alain Zaitoun, Poweltec Guido Poggesi, REP WorkShop EOR, IAPG, Neuquen, 3-5 November 2010
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Outline What is Microgel? Field case gas storage well
Water Shutoff basics Field case gas storage well Field cases heavy oil horizontal wells Conclusions/Perspectives
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New Microgel Technology
POWELTEC With new microgel technology, chemistry, thickness and consistency of polymeric species can be modified to fit with actual reservoir conditions dH 2.0 mm dH 0.3 mm Small microgel Linear polymer Microgel A Microgel B Linear chain
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Microgel Tecnology = Where we are today
Microgel lots size 0.3 – 1.0 – 2.0 µm Broad permeability range ( mD) Commercially available under emulsion and powder forms High temperature stability (up to 165°C) High shear stability ( sec-1) High chemical stability (CO2, H2S, high salinity) Environmentally friendly (PLONOR N. Sea yellow list) Efficient in WSO and Sand Control applications
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Several Microgel products proposed today
“Brightwater” (Popping microgel) “Colloidal Dispersion Gels” (CDG) “SMG” (Small calibrated microgels) “PPG” (Preformed Particle Gels to plug thief zones) More used for Conformance Injection well treatments (except SMG)
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Water Shutoff
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Principe of WSO by RPM Polymers
Oil Water Low k High K Two-layer model Swollen or weakly X-linked polymer
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Modification of Relative Permeability
PRINCIPLE OF RPM TREATMENTS Modification of Relative Permeability by Polymer Adsorption (Sor) (Swi) Adsorbed polymer or microgels RRF=10 before polymer after polymer
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POWELTEC Example of integrated study: Water Shutoff in a Gas storage well Cerville (GDF) (SPE )
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Model construction
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WSO GDF Cerville: Main outcomes from integrated study
Treatment design by lab and reservoir simulation study Optimal volume = 50 m3 Water expected strongly reduced (Factor 3) Pressure constraints during microgel injection is expected to be the sensitive parameter for operational issues (verified in field) Results Treatment successful Well behavior in good agreement with simul. forecasts
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Effect of Microgel WSO treatment on gas well
Water Gas Ratio Microgel Treatment
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Effect of Microgel WSO treatment on gas well
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Microgel Treatment of gas well= Sand Control
Sand production before treatment Sand production after treatment Microgel treatment in well X0 Measurements made by G. RIGOLLET-GOUSSU & M.G. GROUGON
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Treatment Example of successfull WSO treatment:
Pelican Lake Horizontal Well 11-15A (Canada) 100 200 300 400 500 600 700 800 900 1000 juil-85 avr-88 juin-88 oct-88 avr-89 juin-89 oct-89 avr-90 juin-90 oct-90 avr-91 juin-91 0 % 10 % 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 100 % Water Oil Water Cut Year 1 Year 2 Year 3 Year 4 Monthly Production (m3) Treatment
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A successful WSO treatment in horizontal well (Canada)
1000 2000 3000 4000 5000 6000 7000 Cumulated Water Production (m3) Sand cleaning Incremental oil RPM treatment Cumulated Oil Production (m3)
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POWELTEC Example of integrated study: Water Shutoff in a Heavy-Oil Horizontal Well with Bottom Aquifer (Oman)
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Candidate Well data High-permeability sandstone formation
Oil viscosity = 200 cP, Temperature= 50°C, Salinity= 6 g/L TDS Horizontal well Open hole + screen 400 m long High water cut production (98%), bottom active aquifer Pumping Gross Production = 300 m3/d Strategy Reservoir simulation to optimize WSO treatment Bullhead injection Microgel + Gel (RPM products)
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Model construction and Polymer input data
Near-wellbore reservoir model Coreflood data
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Water rise in the wellbore
History matching History matching Water rise in the wellbore
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Polymer WSO treatment
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WSO performances forecasts from reservoir simulations
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Field Results in good agreement with predictions
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Conclusions/Perspectives
Microgels have great applications in WSO/Conformance Higher stability than conventional polymers Production well WSO by Microgels RPM attractive Easy option, low risk, low cost, quick payout Applicable in both oil and gas wells Bullhead injection in most cases easy handling Sand control effects can be also obtained
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