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Questions and Answers
What are the two broad categories of petroleum reservoirs?
What are the two broad categories of petroleum reservoirs?
What do deposits rich in oil and natural gas refer to?
What do deposits rich in oil and natural gas refer to?
Oil fields and natural gas fields
Oil reservoirs occur at depths of ___ to ___ meters.
Oil reservoirs occur at depths of ___ to ___ meters.
1,000 to 6,000
Natural gas with a high amount of natural gas liquids is termed 'wet gas'.
Natural gas with a high amount of natural gas liquids is termed 'wet gas'.
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What does a phase diagram represent?
What does a phase diagram represent?
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Where do crude oil reservoirs occur on a multi-component phase diagram?
Where do crude oil reservoirs occur on a multi-component phase diagram?
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If a reservoir’s conditions plot above the bubble point line, it is an ___ crude oil reservoir.
If a reservoir’s conditions plot above the bubble point line, it is an ___ crude oil reservoir.
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Study Notes
Petroleum Reservoirs
- Petroleum reservoirs are underground pools of hydrocarbons contained in porous and permeable rocks and fractures.
- Reservoirs are classified as oil or gas reservoirs based on the dominant hydrocarbon type.
- Many reservoirs are connected to water-bearing rocks, called aquifers.
- Oil reservoirs occur at shallower depths (1,000 to 6,000 meters) than gas reservoirs, which are found at greater depths.
- Reservoir fluids have different compositions, which determine their characteristics.
- Natural gas reservoirs with a high proportion of ethane and heavier hydrocarbons (natural gas liquids or NGL) are called "wet gas" and produce condensate at the surface.
- Deeper natural gas reservoirs have lower proportions of heavier hydrocarbons and are considered "dry gas".
Phase Diagram of Hydrocarbon Reservoir Fluid
- A phase diagram (or phase envelope) is a graphical representation of the physical states of a substance under different conditions of temperature and pressure.
- Phase diagrams are used to study the behavior of reservoir fluids at different stages of production.
- A typical phase diagram has pressure (P) on the y-axis and temperature (T) on the x-axis.
- Each point on the phase diagram corresponds to a specific pressure and temperature combination and indicates the phase or phases present.
- On a multi-component phase diagram, crude oil reservoirs occur to the left of the critical point, and gas reservoirs occur to the right of the critical point.
Reservoir Saturation
- The position of a reservoir's temperature and pressure on the phase diagram determines its saturation status:
- Undersaturated crude oil reservoir: The reservoir's temperature and pressure are above the bubble point line, indicating a single-phase liquid.
- Saturated crude oil reservoir: The reservoir's temperature and pressure are below the bubble point line, indicating a two-phase mixture of liquid and vapor.
- Natural gas reservoir: The reservoir's temperature and pressure are above the dew point line, indicating a single-phase vapor.
- Condensate gas reservoir: The reservoir's temperature and pressure are below the dew point line, indicating a two-phase mixture of liquid and vapor.
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Description
This quiz explores the characteristics and classifications of petroleum reservoirs, including oil and gas types. Additionally, it covers the phase diagram of hydrocarbon reservoir fluids, illustrating their physical states under varying conditions. Test your understanding of these essential concepts in petroleum engineering.
