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36 Cards in this Set
- Front
- Back
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Define Under saturated oil reservoir
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An reservoir where the pressure is greater than than the bubble point.
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Define the dew point curve
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The temperature and pressure conditions where first drop of liquid occurs in a mixture.
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Drive index
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It is the fraction of the underground withdrawal with is replaced by a particular drive mechanism. (DDI, SDI, WDI)
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Oil formation volume factor
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Bo = RB/STB
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Isothermal water compressibility
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Cw = 1/V * (dV/dP)
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material balance
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Volumetric balance between underground withdrawal and voidage replacement and aquifer influx and formation expansion
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Constant composition expansion test
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Finds the bubble point, drops the pressure and keeps the gas that comes of out solution in place.
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Differential liberation test
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Gives Bo, Bg, Rs. Drops the pressure and releases the gas that comes out of solution
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Wet-gas reservoir
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GOR < 100,000 SCF/STB
no liquid in the formation reservoir, but the separator is in the two phase evenlope |
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T/F Oil shrinks when brought to surface from the reservoir mainly due to the liberation of solution of gas.
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True
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T/F A retrograde condenstate reservoir exists initally as a liquid phase in the reservoir, but forms a two phase stream in the well
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False
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T/F A saturated oil reservoir may oinly be a black oil reservoir and not a volatile oil reservoir
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Fales
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T/F The laboratory test to determine bubble point is the differential liberation test
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False
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T/F Oil compressibility may be determined from laboratory flash expansion test.
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True
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T/F Optimum separator conditions yield the highest producing gas oil ration
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False
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T/F The two phase oil formation volume factor decreases with decrease in pressure below the bubble point
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False
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T/F The bubble point pressure of an oil reservoir corresponds to the pressure at the gas oil contact
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True
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T/F Cumulative aguifer influx may exceed the total underground withdral
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False
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The van Everdingern-Hurst dimensionless water influx, Wed, reaches an asymptotic value for finite and infiite aquifers
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False
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Define the bubble point line
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The line on the phase envelope which indicated where the 1st bubble of gas occurs
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What is an under saturated oil reservoir
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This is a reservoir that could dissolve more gas in solution if more gas were present. The pressure is greater than the bubble point pressure
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What is the total underground withdrawl?
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Total amount of oil,gas, and water produced from a reservoir
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What is a volumetric gas reservoir?
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As pressure declines, due to production, there is an insignificant amount of water influx. R volume will not change.
GP = G - V |
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What is isothermal compressibility?
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Change in volume due to pressure change.
C = -1/V ( dV/dP) |
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Define the bubble point line
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The line on the phase envelope which indicated where the 1st bubble of gas occurs
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What is an under saturated oil reservoir
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This is a reservoir that could dissolve more gas in solution if more gas were present. The pressure is greater than the bubble point pressure
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What is the total underground withdrawl?
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Total amount of oil,gas, and water produced from a reservoir
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What is a volumetric gas reservoir?
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As pressure declines, due to production, there is an insignificant amount of water influx. R volume will not change.
GP = G - V |
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What is isothermal compressibility?
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Change in volume due to pressure change.
C = -1/V ( dV/dP) |
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Define the bubble point line
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The line on the phase envelope which indicated where the 1st bubble of gas occurs
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What is an under saturated oil reservoir
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This is a reservoir that could dissolve more gas in solution if more gas were present. The pressure is greater than the bubble point pressure
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What is the total underground withdrawl?
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Total amount of oil,gas, and water produced from a reservoir
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What is a volumetric gas reservoir?
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As pressure declines, due to production, there is an insignificant amount of water influx. R volume will not change.
GP = G - V |
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What is isothermal compressibility?
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Change in volume due to pressure change.
C = -1/V ( dV/dP) |
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What is a reservoir?
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That portion of a trap which contains oil
- hydraulically single and/or and/or gas as a single hydraulically a as gas connected syste |
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What is included in a petroleum system?
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seal
reservoir rock hydrocarbon migration mature source rock |
