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Petroleum reservoir fluid properties (view source)
Revision as of 15:44, 8 August 2014
, 15:44, 8 August 2014→Reservoir water
==Reservoir water==
==Reservoir water==
The water found in petroleum reservoirs is usually a brine consisting mostly of sodium chloride (NaCl) in quantities from 10 to 350 ppt (‰); seawater has about 35 ppt. Other compounds (electrolytes) found in reservoir brines include calcium (Ca), magnesium (Mg), sulfate (SO<sub>4</sub>), bicarbonate (HCO<sub>3</sub>), iodide (I), and bromide (Br). Brine specific gravity increases with salinity in units of about 0.075 per 100 ppt.
The water found in petroleum reservoirs is usually a ''brine'' consisting mostly of sodium chloride (NaCl) in quantities from 10 to 350 ppt (‰); seawater has about 35 ppt. Other compounds (electrolytes) found in reservoir brines include calcium (Ca), magnesium (Mg), sulfate (SO<sub>4</sub>), bicarbonate (HCO<sub>3</sub>), iodide (I), and bromide (Br). Brine specific gravity increases with salinity in units of about 0.075 per 100 ppt.
At reservoir conditions, the brine that is sharing pore space with hydrocarbons always contains a limited amount of solution gas (mainly methane), from about 10 SCF/STB at 1000 psia to about 35 SCF/STB at 10,000 psia for gas-water systems and slightly less for oil-water systems. Increasing salinity decreases gas in solution. Water compressibility ranges from 2.5 to 5 × 10<sup>–6</sup> psi<sup>–1</sup>, decreasing with increasing salinity. Water viscosity ranges from about 0.3 cp at high temperatures (>[[temperature::250°F]]) to about 1 cp at ambient temperatures, increasing with increasing salinity. Finally, reservoir brines exhibit only slight shrinkage (
At reservoir conditions, the brine that is sharing pore space with hydrocarbons always contains a limited amount of [[solution gas]] (mainly methane), from about 10 SCF/STB at 1000 psia to about 35 SCF/STB at 10,000 psia for gas-water systems and slightly less for oil-water systems. Increasing salinity decreases gas in solution. [http://water.usgs.gov/edu/compressibility.html Water compressibility] ranges from 2.5 to 5 × 10<sup>–6</sup> psi<sup>–1</sup>, decreasing with increasing salinity. Water [[Wikipedia:Viscosity|viscosity]] ranges from about 0.3 cP at high temperatures (>[[temperature::250°F]]) to about 1 cP at ambient temperatures, increasing with increasing salinity. Finally, reservoir brines exhibit only slight shrinkage (
==Petroleum reservoir classifications==
==Petroleum reservoir classifications==