Reservoir types with Reference to Phase Diagram

Question 1

Petroleum reservoirs are broadly
classified as oil or gas reservoirs.
These broad classifications are further
subdivided depending on:

Answer 1

The composition of reservoir Hydrocarbon mixture
Initial pressure and temperature
Pressure and Temperature of the surface product

Question 2

Defined as the highest temperature where in liquid cannot be formed regardless of its pressure

Answer 2

Cricondentherm

Question 3

Defined as the highest pressure above where in gas cannot be formed regardless of its temperature

Answer 3

Criconderbar

Question 4

Referred to as the state of pressure and temperature where all the intensive properties of liquid and gas are equal

Answer 4

Critical Point

Question 5

Enclosed of bubble curve point and dew curve point, gas and liquid coexist in an equilibrium

Answer 5

Phase envelope (Two-phase Region)

Question 6

dashed lines within the phase diagram. They
describe the pressure and temperature conditions for
equal volumes of liquids. Note that the quality lines
converge at the critical point (point C).

Answer 6

Quality Lines

Question 7

Defined as a line separating the liquid-phase region from two phase region

Answer 7

Bubble Point

Question 8

Defined as a line separating the vapor-phase region from two phase region

Answer 8

Dew Point

Question 9

Essential use of multi-component
p – T diagram:

Answer 9

Classify reservoirs
Classify the naturslly occuring hydrocarbon system
Describe the phase behavior of the resevoir fluid

Question 10

The reservoir temperature T is greater than the critical
temperature Tc of the Hydrocarbon fluids

Answer 10

Gas Reservoirs

Question 11

The reservoir temperature T is less than the critical temperature Tc of the Hydrocarbon fluids

Answer 11

Oil Reservoirs