PETE 310

1
PETE 310

• Lecture 17
• Chapter 10 Properties of Black Oils - Reservoir
  Fluid Studies

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Fluid Properties for Reservoir Engineering
Processes

• The fluid properties of interest to the Reservoir
  Engineer are those that affect the mobility of
  fluids within the reservoirs these are used in
  material balance calculations
• Properties at surface conditions for
  transportation and sales (API, viscosity, oil
  quality)

3
Fluid Properties for Reservoir Engineering
Processes

• PVT properties are determined from 5 specific lab
  procedures
• Flash liberation tests
• Differential Liberation Tests
• Viscosity Measurements
• Separator Tests
• Compositional measurements

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Fluid Properties Determined

• Oil Properties
• Bubble Point Pressure
• Bo
• Rs
• Bt
• Co and mo
• Gas properties
• z
• Bg and mg
• Compositions oil gas

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Oil Sampling Procedures

• Bottom hole or subsurface samples
• Separator Samples
• SAMPLE BEFORE RESERVOIR PRESSURE DROPS BELOW Pb

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1.Flash Vaporization Test
Temperature of Test Reservoir Temperature
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1.Flash Vaporization Test

• Properties determined
• Pb
• Co

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Determination of Pb
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Determination of Co
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2.Differential Separation Test
Temperature of Test Reservoir Temperature
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2.Differential Separation Test

• Properties Determined
• Oil formation volume factor at the Bubble Point
  pressure Bodb and below the bubble point pressure
  Bod
• Solution gas-oil ratio at the Bubble Point
  pressure Rsdb and below the bubble point pressure
  Rsd
• Isothermal compressibility (derived property)

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3. Separator Tests

• Tests performed at a combination of different
  Temperature and Pressure pairs

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3. Separator Tests

• Goals Maximize API, minimize BoSb RsSb

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Optimization of Separator 2 Conditions
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Comparison between 1 2 Separators Stages
(volatile oil)
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Typical PVT Properties for a Black Oil and a
Volatile Oil
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Typical PVT Properties for a Black Oil and a
Volatile Oil
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Nomenclature
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4. Compositional Tests
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HROMO/chromintro.html
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HROMO/chroanim.html