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Petroleum Thermodynamics > Chapter 3- More Insight > Flashcards

Chapter 3- More Insight Flashcards

1
Q

What is bubble point pressure ?

A

This is the pressure at which the first sign of gas formation is detected.

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2
Q

What is dew point pressure ?

A

This is the pressure in which the first drop of liquid condenses out of gas .

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3
Q

Classification of a petroleum reservoir is based on ?

A

Reservoir and reservoir fluid

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4
Q

Classify a petroleum reservoir based on reservoir?

A

1) initial pressure Pi

2) temperature

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5
Q

Classify a petroleum reservoir based on reservoir fluid ?

A

1) critical pressure and temperature. Pc and Tc

2) composition x

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6
Q

Reservoirs can be classified into two types namely ?

A

Oil reservoir

Gas reservoir

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7
Q

How do we identify an oil reservoir?

A

If the reservoir temperature Tres is less than the critical temperature Tc of the reservoir fluid , the reservoir is classified as an oil reservoir

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8
Q

How do we identify a gas reservoir?

A

If the reservoir temperature is greater than the critical temperature of the reservoir fluid , the reservoir is considered a gas reservoir.

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9
Q

What are the 3 major state variables ?

A

Pressure

Volume

Temperature

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10
Q

Depending on the initial pressure of the reservoir, oil reservoirs can be sub-classified into the following categories.

A

Under saturated oil reservoir

Saturated oil reservoir

Gas cap reservoir

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11
Q

When do we have an under saturated oil reservoir ?

A

If the initial reservoir pressure is greater than bubble point pressure of the reservoir fluid .

Pi,res>Pb

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12
Q

When do we have a saturated oil reservoir?

A

If the initial reservoir pressure is equal to the bubble point pressure

Pi, res= Pb

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13
Q

When do we have a gas cap reservoir?

A

If the initial reservoir pressure is below the bubble point pressure of the reservoir fluid .

Pi,res

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14
Q

What is another term for gas cap reservoir

A

Two phase reservoir because it’s in the two phase region

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15
Q

Based on physical properties composition gas oil ratio, appearance and P-T phase diagram of reservoir fluid , crude oils are commonly classified into ?

A

Black oil BO
Low shrinkage LS
High shrinkage HS
Near critical NC

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16
Q

When produced , black oils usually yield gas-oil ratios between ?

A

200-700 scf/STB

17
Q

What is the oil gravities of black oils?

A

15-40 degree API

18
Q

What is the color of the stock tank oil ?

A

Brown to dark green in color
According to Ahmed tarek ( reservoir engineering handbook second edition )
According to Oscar , it’s color is black

19
Q

How are the quality lines for black oils ?

A

They are approximately equally spaced

20
Q

How is the liquid shrinkage curve prepared?

A

It is prepared by plotting the liquid volume percent as a function of pressure.

21
Q

How is the liquid shrinkage curve for black oils ?

A

It is approximately a straight line except at very low pressures .

22
Q

How are the quality lines for low shrinkage oil ?

A

They are closely spaced near the dew point curve

23
Q

What is the function of liquid shrinkage curve ?

A

They show the shrinkage characteristics of the various categories of crude oils

24
Q

What are the other associated properties of low shrinkage oil ?

A

Oil formation volume factor less than 1.2 bbl/STB

Gas-Oil ratio less than 200scf/STB

Oil gravity less than 35 degree API

Black or deeply colored

25
Q

What is another name for high shrinkage Oil?

A

Volatile oil

26
Q

How are the quality lines for high shrinkage

A

They are close together near the bubble point and are more widely spaced at lower pressures.

27
Q

What is the major characteristic of high shrinkage ?

A

It is commonly characterized by a high liquid shrinkage immediately below bubble point

28
Q

What are the other characteristic properties of high shrinkage oil ?

A

Oil FVF less than 2 bbl/STB

GOR between 2000-3000 scf/STB

Oil gravities between 45-55 degree API

Greenish to orange in color

Lower liquid recovery of separator conditions

29
Q

What happens to the API gravity of the stock tank liquid in the later life of the high shrinkage oil reservoir?

A

The API gravity of the Stock Tank liquid will increase in the later life of the reservoir.

30
Q

When do we have a near critical reservoir?

A

This is when the reservoir temperature is near the critical temperature Tc of the hydrocarbon system

31
Q

How else can we identify a near critical oil without comparing the temperature of the reservoir to the critical temperature ?

A

We can do this by looking at the quality lines , because all the quality lines converge at the critical point .

32
Q

What are the other characteristic properties of the high shrinkage oil ?

A

High GOR of 3000 scf/STB

Oil FVF 2.0 bbl/STB or higher

Petroleum Thermodynamics (6 decks)

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