challenges drill fluids
DESCRIPTION
presenting results of analysis or challenges for drilling fluids for deep hydrocarbon well drillingTRANSCRIPT
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DRILLING FLUID CHALLENGES FOR DRILLING FLUID CHALLENGES FOR OIL-WELL DEEP DRILLING
Vassilios C. KELESSIDISsk l1@h tm il [email protected]
Technical University of CreteMineral Resources Engineering
SGEM 2009SGEM 2009Albena, June 14-19, 2009
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Research aim
Develop smart drilling fluidsAdaptable to harsh conditionsH il bl t h i s f ti l Have available techniques for optimal measurements of fluid properties, particularly rheologyDevelop hydraulics models for pressure drop Develop hydraulics models for pressure drop prediction along the wellboreBetter understanding efficient cuttings transport in a multiphase environmenttransport in a multiphase environment
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The problemDrilling depths, total (>7000 m) and water (~ 3000m) depths are ever increasing3000m) depths, are ever increasingHigh pressures (>2000 bar) and high temperatures (>3000C) are encounteredtemperatures (>3000C) are encounteredNarrow pressure tolerancesHarder rock is encountered, lower drilling ratesDemand for better drilling fluids, avoid problems -understand behavior in such hostile p menvironmentsHydraulic programs for complex rheologyHydraulic programs for complex rheology
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Deep drilling challenges
44hard rock - wellbore stability - high P, T
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MPD vs Conventional
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Drilling fluid challengesROLE
Hydrostatic pressureHydrostatic pressureCuttings transportCooling the bitWellbore stabilityWellbore stab l ty
CHALLENGESHigh T P stable density and rheologyHigh T,P stable density and rheologyMeasurements at downhole conditionsPredictions of downhole conditionsStability of additivesy fAppropriate rheological models
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Rheology, effect of pressure and temperaturetemperature
Low T
High T
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Lignite additive for T control
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‘Flat’ rheology fluids
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Barite sag – solution ?Rheograms for micron sized barite
*116.085.4
=
=
sPaKPa
bariteAPI
yτ
*076092.0
=
=
sPaKPa
baritesizedmicron
yτ
841.0116.0
=nsPaK
854.0076.0
==
nsPaK
1010
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Conclusions
Demand for more energy challenge to oil industry, deeper waters and deeper wellsExtreme environments better drilling Extreme env ronments better dr ll ng fluidsImproved drilling techniques Managed Improved drilling techniques, Managed Pressure Drilling, narrow pressure marginsGood and representative rheological models for the complex fluidspModel of choice – Herschel-Bulkley, hydraulics modeling is neededhydraulics modeling is needed
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ConclusionsTake into account effects of temperature and pressurepressureModeling for predicting temperature and pressure downholeRheological measurements at downhole Rheological measurements at downhole conditionsDevelopment of additives that withstand extreme conditionsLeading to ‘smart’ drilling fluids, adopting to
ti l i tparticular environment1212
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Need to meet the challenge
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