PVT

pvt is calculated at various phases of the prodx modeling flow to establish relevant properties at pressures and temperatures of interest input properties for the pvt model can have significant impacts on downstream calculations, like multiphase flow correlations during a bottomhole pressure traverse as such, it's important to define these as accurately as possible for each well input properties for pvt model the black oil model is used to calculate pvt properties of fluids the input requirements for creating a black oil pvt model are described as follows and are imported in the wellbore formation docid\ z0gzmed5eninbjj5bbcrp table api gravity oil specific gravity at formation conditions, in degrees api gas specific gravity ratio between hydrocarbon gas density and air density at standard conditions, unitless water salinity salinity content of reservoir water, in parts per million initial solution gas oil ratio (rsi) initial solution gas oil ratio at reservoir conditions, scf/stb n2, co2, and h2s molar fractions impurity content of reservoir gas, in molar fraction reservoir pressure and temperature initial reservoir pressure (psia) and temperature (degf) are used to both establish initial conditions for saturation pressure and establish a linear geothermal gradient in the absence of more granular data gas properties gas correlations are calculated for the following properties, and the available options in prodx are noted pseudo critical pressure and temperature (ppc, tpc) gas pseudo critical pressure and temperature are the weighted average of critical properties of pure components in a gas mixture available correlations sutton standing z factor (z) the gas z factor is the ratio of the gas volume at input pressure and temperature to the volume that an ideal gas would occupy at the same pressure and temperature available correlations dranchuk aboukassem hall yarborough compressibility (cg) gas compressibility is the measure of volume change in response to a pressure change available correlations hall yarborough mattar formation volume factor (bg) gas formation volume factor is the ratio of volume of gas at a specified temperature and pressure to standard conditions available correlations xecta (internal) density (ρg) gas density is its mass divided by its volume at a specific pressure and temperature available correlations xecta (internal) viscosity (µg) gas viscosity is a measure of its resistance to flow available correlations lee carr oil properties oil correlations are calculated for the following properties, and the available options in prodx are noted saturation pressure (psat) oil saturation pressure is the pressure at which the gas phase evolves out of solution, also known as the bubble point available correlations standing vazquez beggs lasater glaso glaso corrected glaso volatile glaso volatile corrected solution gas oil ratio (rs) solution gas oil ratio is the ratio of gas volume that will dissolve in a volume of oil at a given pressure and temperature available correlations standing vazquez beggs lasater glaso glaso corrected glaso volatile glaso volatile corrected compressibility (co) oil compressibility is the measure of volume change in response to a pressure change available correlations vazquez beggs density (ρo) oil density is its mass divided by its volume at a specific pressure and temperature available correlations xecta (internal) formation volume factor (bo) oil formation volume factor is the ratio of volume of oil at a specified temperature and pressure to standard conditions available correlations standing vazquez beggs glaso viscosity (µo) oil viscosity is a measure of its resistance to flow available correlations beggs robinson beal water properties water correlations are calculated for the following properties, and the available options in prodx are noted compressibility (cw) water compressibility is the measure of volume change in response to a pressure change available correlations dodson standing osif density (ρw) water density is its mass divided by its volume at a specific pressure and temperature available correlations xecta (internal) mccain formation volume factor (bw) water formation volume factor is the ratio of volume of water at a specified temperature and pressure to standard conditions available correlations mccain mccoy viscosity (µw) water viscosity is a measure of its resistance to flow available correlations matthews russel mccain mccoy van wingen solution gas water ratio (rsw) solution gas water ratio is the ratio of gas volume that will dissolve in a volume of water at a given pressure and temperature available correlations mccoy culberson mcketta interfacial tension interfacial tension correlations are calculated for the following properties, and the available options in prodx are noted gas oil interfacial tension surface tension between the gas and oil phases available correlations abdul majeed baker swerdloff gas water interfacial tension surface tension between the gas and water phases available correlations firoozabadi ramey jennings newman oil water interfacial tension surface tension between the oil and water phases available correlations firoozabadi ramey