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Petroleum reservoir fluid properties (view source)
Revision as of 20:47, 16 January 2014
, 20:47, 16 January 2014→Property definitions
The ratio of density of any gas at standard conditions (14.7 psia and 60 °F) to the density of air at standard conditions; based on the ideal gas law (''pV'' = ''nRT''), gas gravity is also equal to the gas molecular weight divided by air molecular weight (M<sub>air</sub> = 28.97). Denoted mathematically as γ<sub>g</sub> (where air = 1).
The ratio of density of any gas at standard conditions (14.7 psia and 60 °F) to the density of air at standard conditions; based on the ideal gas law (''pV'' = ''nRT''), gas gravity is also equal to the gas molecular weight divided by air molecular weight (M<sub>air</sub> = 28.97). Denoted mathematically as γ<sub>g</sub> (where air = 1).
[[file:petroleum-reservoir-fluid-properties_fig1.png|left|thumb|{{figure number|1}}Pressure-temperature phase diagram. Reservoir classification would be ''oil'' if reservoir temperature were less than 127 °F and ''gas'' if reservoir temperature were greater than 127°F.]]
===Bubblepoint pressure===
===Bubblepoint pressure===
At a given temperature, this condition occurs when an oil releases an infinitesimal bubble of gas from solution when pressure drops below the bubblepoint.
At a given temperature, this condition occurs when an oil releases an infinitesimal bubble of gas from solution when pressure drops below the bubblepoint.
[[file:petroleum-reservoir-fluid-properties_fig2.png|thumb|{{figure number|2}}Pressure-temperature phase diagrams of gas cap and oil fluids in a reservoir that is Initially at saturated conditions.]]
===Retrograde dewpoint pressure===
===Retrograde dewpoint pressure===
===Critical point===
===Critical point===
The pressure and temperature of a reservoir fluid where the bubblepoint pressure curve meets the retrograde dewpoint pressure curve (see Figures 1 and 2), representing a unique state where all properties of the bubblepoint oil are identical to the dewpoint gas.
The pressure and temperature of a reservoir fluid where the bubblepoint pressure curve meets the retrograde dewpoint pressure curve (see [[:file:petroleum-reservoir-fluid-properties_fig1.png|Figures 1]] and [[:file:petroleum-reservoir-fluid-properties_fig2.png|2]]), representing a unique state where all properties of the bubblepoint oil are identical to the dewpoint gas.
[[file:petroleum-reservoir-fluid-properties_fig1.png|thumb|{{figure number|1}}Pressure-temperature phase diagram. Reservoir classification would be ''oil'' if reservoir temperature were less than 127 °F and ''gas'' if reservoir temperature were greater than 127°F.]]
[[file:petroleum-reservoir-fluid-properties_fig2.png|thumb|{{figure number|2}}Pressure-temperature phase diagrams of gas cap and oil fluids in a reservoir that is Initially at saturated conditions.]]
===Composition or feed===
===Composition or feed===