42 Questions
Which one of these is a physical classification of petroleum?
Density, Viscosity
What is the equation to calculate API gravity?
API = 141.5(ρoil - ρwater) - 131.5
What is the unit of viscosity for petroleum-related fluids?
Centipoise (cp)
Which term refers to the ratio between solution gas volume and oil volume within the oil in an oil reservoir?
Solution GOR
What is the most likely reason for the oil FVF to be greater than 1.0 in an oil reservoir?
Oil shrinkage by degassing
At the GOC in a two-phase region, what are the PT conditions?
Saturated oil and saturated gas
Which type of hydrocarbon is characterized by having a high wax content?
Solids
What is the pour point of the waxy crude oil from the Barryroe Field?
21°C
At what temperature does the wax concentration in the waxy crude oil start to solidify?
46°C
What is the viscosity of the waxy crude oil at reservoir conditions?
0.8 cP
Which of the following is a common non-hydrocarbon component found in natural gas?
Carbon Dioxide
Which class of organic molecules in crude oil contains no double bonds?
Paraffins
Which type of crude oil generally sells at a premium due to its properties?
Sweet, light crude
Which type of natural gas reservoir contains dissolved gas at reservoir conditions?
Gas cap and oil leg
Which of the following is a physical classification of petroleum based on viscosity and liquid gravity?
Conventional
What is the equation to calculate API gravity?
API = 141.5(\rho_{oil}/\rho_{water}) - 131.5
What is the unit of viscosity for petroleum-related fluids?
Centipoise (cp)
Which of the following is a common non-hydrocarbon component found in natural gas?
Carbon dioxide
What is the pour point of the waxy crude oil from the Barryroe Field?
Below -20°C
Which type of natural gas reservoir contains dissolved gas at reservoir conditions?
Wet gas or gas condensate
What is the unit of viscosity for petroleum-related fluids?
Centipoise
Which of the following is a characteristic of waxy crude oil?
Solid at surface conditions
What is the cloud point of the waxy crude oil from the Barryroe Field?
46°C
What is the main difference between resins and asphaltenes in biodegraded heavy oils?
Resins have long alkane tails, while asphaltenes have condensed aromatic and naphthenic rings.
What is the difference between a saturated fluid and an unsaturated fluid?
A saturated fluid is within the single-phase region, while an unsaturated fluid is on the bubble-point/dew point line.
Which one of the following equations represents the volume of oil at reservoir conditions as a fraction of the volume of oil at the surface?
$Oil\ FVF = \frac{Volume\ of\ oil\ at\ reservoir\ conditions},{Volume\ of\ oil\ at\ surface}$
What does the solution GOR represent in an oil reservoir?
The ratio between solution gas volume and oil volume within the oil
In an oil reservoir, what does a solution GOR of 100 mean?
100 standard cubic feet of gas are dissolved in each barrel of oil
Which of the following is a characteristic of waxy crude oil?
High pour point
What is the equation to calculate API gravity?
API = 141.5(\rho_{oil}/\rho_{water}) - 131.5
What is the unit of viscosity for petroleum-related fluids?
Centipoise (cp)
Which of the following is a characteristic of waxy crude oil?
Solid at surface conditions
What is the pour point of the waxy crude oil from the Barryroe Field?
21°C
What is the cloud point of the waxy crude oil from the Barryroe Field?
46°C
In an oil reservoir, what does a solution GOR of 100 mean?
The oil is saturated with gas
Which one of the following is a common non-hydrocarbon component found in natural gas?
Carbon Dioxide (CO2)
What is the main difference between resins and asphaltenes in biodegraded heavy oils?
Resins are soluble in aromatic solvents while asphaltenes are not
Which type of natural gas reservoir contains dissolved gas at reservoir conditions?
Gas condensate reservoir
Which type of hydrocarbon is characterized by having a high wax content?
Paraffins
Which one of the following equations represents the volume of gas at reservoir conditions as a fraction of the volume of gas at the surface?
$GOR = \frac{V_{gas, reservoir}}{V_{gas, surface}}$
What is the main difference between black oil and volatile oil reservoirs?
Black oil reservoirs have a lower oil FVF than volatile oil reservoirs.
Which one of the following equations represents the ratio between the volume of oil at reservoir conditions and the volume of oil at the surface?
$Oil FVF = \frac{V_{oil, reservoir}}{V_{oil, surface}}$
Test your knowledge on the paraffin series and properties of waxy crude oils. Learn about the basic formula, states of matter based on carbon chain length, and important characteristics like viscosity, cloud point, and pour point. Explore real-world examples like the Barryroe Field in the North Celtic basin.
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