Crude oil reservoirs are classified according to initial reservoir pressure into the following categories: (1) under-saturated oil reservoir in which initial reservoir pressure is greater than the bubble point pressure of reservoir fluid (2) saturated oil reservoir in which initial reservoir pressure is equal to the bubble point pressure of reservoir fluid (3) gas-cap reservoir in which initial reservoir pressure is below the bubble point pressure of reservoir fluid, so reservoir is termed as gas-cap or two-phase reservoir, since the gas or vapor phase is underlain by an oil phase. The physical and chemical properties of crude oils vary considerably and depend on the concentration of the various types of hydrocarbons and minor constituents present. Petroleum (an equivalent term is a crude oil) is a complex mixture consisting predominantly of hydrocarbons and containing sulfur, nitrogen, oxygen, and helium as minor constituents.
0 kommentar(er)
