Petroleum Engineering Review Quiz
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Questions and Answers

What is the equation for the Oil Formation Volume Factor (FVF)?

  • $FVF = V_{reservoir} - V_{oil}$
  • $FVF = \frac{V_{oil}}{V_{reservoir}}$ (correct)
  • $FVF = V_{oil} - V_{reservoir}$
  • $FVF = \frac{V_{reservoir}}{V_{oil}}$

    • Which property is used to classify petroleum based on its physical characteristics?

  • Flash point
  • Reid vapor pressure
  • Pour point
  • API gravity (correct)

    • What does PNA classification refer to in the context of petroleum?

  • Classification based on pressure, naphtha, and aromatic content
  • Classification based on paraffinic, naphthenic, and aromatic content (correct)
  • Classification based on pressure, nitrogen, and acidity
  • Classification based on paraffin, nitrogen, and acidity

    • What is the primary reason for the buoyancy effects in an oil reservoir?

    <p>Difference in density between oil and surrounding fluids</p> Signup and view all the answers

    What is the main difference between resins and asphaltenes in biodegraded heavy oils?

    <p>Resins are soluble in aromatic solvents while asphaltenes are not</p> Signup and view all the answers

    Which type of natural gas reservoir contains dissolved gas at reservoir conditions?

    <p>Gas condensate reservoir</p> Signup and view all the answers

    Which type of hydrocarbon is characterized by having a high wax content?

    <p>Paraffins</p> Signup and view all the answers

    What does the Gas:Oil ratio (GOR) represent?

    <p>$GOR = rac{V_{gas, reservoir}}{V_{gas, surface}}$</p> Signup and view all the answers

    What is the main difference between black oil and volatile oil reservoirs?

    <p>Black oil reservoirs have a lower oil FVF than volatile oil reservoirs</p> Signup and view all the answers

    What does the oil Formation Volume Factor (FVF) represent?

    <p>$Oil FVF = rac{V_{oil, reservoir}}{V_{oil, surface}}$</p> Signup and view all the answers

    What is the equation for oil formation volume factor (FVF)?

    <p>Oil FVF = Volume of oil at reservoir conditions / Volume of oil at surface</p> Signup and view all the answers

    What does a solution GOR (Gas:Oil ratio) of 100 indicate?

    <p>100 standard cubic feet of gas are dissolved in each barrel of oil in an oil reservoir</p> Signup and view all the answers

    What is the unit of viscosity for petroleum-related fluids?

    <p>Centipoise (cp)</p> Signup and view all the answers

    What does a high pour point indicate for waxy crude oil?

    <p>It solidifies at higher temperatures</p> Signup and view all the answers

    How is API gravity calculated?

    <p>API = 141.5(ρoil/ρwater) - 131.5</p> Signup and view all the answers

    What are the main components of asphaltenes?

    <p>Condensed aromatic and naphthenic rings</p> Signup and view all the answers

    What differentiates a saturated fluid from an unsaturated fluid?

    <p>Saturated fluid is within the single-phase region, while unsaturated fluid is on the bubblepoint/dew point line</p> Signup and view all the answers

    What is the cloud point of the waxy crude oil from the Barryroe Field?

    <p>46°C</p> Signup and view all the answers

    What is a common non-hydrocarbon component found in natural gas?

    <p>Carbon Dioxide</p> Signup and view all the answers

    What characterizes waxy crude oil?

    <p>High wax content</p> Signup and view all the answers

    What does the pour point of the waxy crude oil from the Barryroe Field indicate?

    <p>It solidifies at 21°C</p> Signup and view all the answers

    What is the pour point of waxy crude oil from the Barryroe Field?

    <p>21°C</p> Signup and view all the answers

    What is the cloud point of the waxy crude oil from the Barryroe Field?

    <p>46°C</p> Signup and view all the answers

    What is the viscosity of waxy crude oil at reservoir conditions?

    <p>0.8 cP</p> Signup and view all the answers

    What is the equation to calculate API gravity?

    <p>API = 141.5(\frac{\rho_{oil}}{\rho_{water}}) - 131.5</p> Signup and view all the answers

    Which component is commonly found in natural gas, but is not a hydrocarbon?

    <p>Carbon dioxide</p> Signup and view all the answers

    What property leads to sweet, light crude generally selling at a premium?

    <p>Its properties</p> Signup and view all the answers

    What is the primary classification of organic molecules in crude oil that contain no double bonds?

    <p>Paraffins</p> Signup and view all the answers

    What is the primary reason for dissolved gas in gas cap and oil leg reservoirs at reservoir conditions?

    <p>Buoyancy effects</p> Signup and view all the answers

    What is the physical classification of petroleum based on?

    <p>Viscosity and liquid gravity</p> Signup and view all the answers

    What is the main reason for oil shrinkage leading to an oil formation volume factor (FVF) greater than 1.0 in oil reservoirs?

    <p>Degassing</p> Signup and view all the answers

    What are hydrocarbons with high wax content classified as?

    <p>Solids</p> Signup and view all the answers

    What is the equation to calculate the API gravity?

    <p>API = 141.5(\rho_{oil}/\rho_{water}) - 131.5</p> Signup and view all the answers

    What are the PT conditions at the gas-oil contact (GOC) in a two-phase region?

    <p>Saturated oil and saturated gas</p> Signup and view all the answers

    What does a pour point of 21°C indicate for waxy crude oil from the Barryroe Field?

    <p>Low fluidity at low temperatures</p> Signup and view all the answers

    What is the main component found in natural gas, aside from hydrocarbons?

    <p>Carbon dioxide</p> Signup and view all the answers

    What is the viscosity of waxy crude oil at reservoir conditions?

    <p>0.8 cP</p> Signup and view all the answers

    What is the classification of hydrocarbons with high wax content?

    <p>Solids</p> Signup and view all the answers

    What is the PT condition at the gas-oil contact (GOC) in a two-phase region?

    <p>Saturated oil and saturated gas</p> Signup and view all the answers

    What is the unit of viscosity for petroleum-related fluids?

    <p>Centipoise (cP)</p> Signup and view all the answers

    What characterizes sweet, light crude in terms of market value?

    <p>Sells at a premium due to its properties</p> Signup and view all the answers

    What is the physical classification of petroleum based on?

    <p>Viscosity and liquid gravity</p> Signup and view all the answers

    What is the equation to calculate the oil formation volume factor (FVF)?

    <p>FVF = \frac{1}{B_o}</p> Signup and view all the answers

    What is the main class of organic molecules in crude oil that contain no double bonds?

    <p>Paraffins (alkanes)</p> Signup and view all the answers

    What is the common component found in gas cap and oil leg reservoirs at reservoir conditions?

    <p>Dissolved gas</p> Signup and view all the answers

    Study Notes

    Petroleum Engineering Review

    • Resins in biodegraded heavy oils have a highly polar end group and long alkane tails, while asphaltenes are large highly polar components made up of condensed aromatic and naphthenic rings.
    • A saturated fluid is within the single-phase region, while an unsaturated fluid is on the bubblepoint/dew point line.
    • The equation for oil formation volume factor (FVF) is given by: $Oil\ FVF = \frac{Volume\ of\ oil\ at\ reservoir\ conditions},{Volume\ of\ oil\ at\ surface}$. It represents the ratio of the volume of oil at reservoir conditions to the volume of oil at the surface.
    • The solution GOR (Gas:Oil ratio) represents the ratio between the solution gas volume and the oil volume within the oil in an oil reservoir. It is often expressed in standard cubic feet per stock-tank barrel (scf/stb).
    • A solution GOR of 100 means that 100 standard cubic feet of gas are dissolved in each barrel of oil in an oil reservoir.
    • Waxy crude oil typically has a high pour point, which means it solidifies at higher temperatures.
    • API gravity is calculated using the equation API = 141.5(\rho_{oil}/\rho_{water}) - 131.5, where \rho_{oil} is the density of the oil and \rho_{water} is the density of water.
    • The unit of viscosity for petroleum-related fluids is centipoise (cp).
    • Waxy crude oil is characterized by being solid at surface conditions due to its high wax content.
    • The pour point of the waxy crude oil from the Barryroe Field is 21°C.
    • The cloud point of the waxy crude oil from the Barryroe Field is 46°C.
    • Carbon Dioxide is a common non-hydrocarbon component found in natural gas and is a natural bi-product of thermal maturation of kerogen.

    Oil and Gas Segregation Summary

    • Oil shrinkage by degassing leads to an oil formation volume factor (FVF) greater than 1.0 in oil reservoirs.
    • At the gas-oil contact (GOC) in a two-phase region, the PT conditions are saturated oil and saturated gas.
    • Hydrocarbons with high wax content are classified as solids.
    • The pour point of waxy crude oil from the Barryroe Field is 21°C.
    • The cloud point of the waxy crude oil from the Barryroe Field is 46°C.
    • The viscosity of waxy crude oil at reservoir conditions is 0.8 cP.
    • Carbon dioxide is a common non-hydrocarbon component found in natural gas.
    • Paraffins, or alkanes, are the class of organic molecules in crude oil that contain no double bonds.
    • Sweet, light crude generally sells at a premium due to its properties.
    • Gas cap and oil leg reservoirs contain dissolved gas at reservoir conditions.
    • Physical classification of petroleum is based on its viscosity and liquid gravity.
    • The equation to calculate API gravity is API = 141.5(\rho_{oil}/\rho_{water}) - 131.5, and the unit of viscosity for petroleum-related fluids is centipoise (cp).

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    Description

    Test your knowledge of petroleum engineering with this review quiz. Explore topics such as fluid properties, oil formation, GOR, wax content, API gravity, viscosity, and non-hydrocarbon components. Sharpen your understanding of key concepts in petroleum engineering with this quiz.

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