What is saturation pressure in oil and gas?

Saturation pressure An oil at its bubblepoint pressure or a gas at its dewpoint pressure.

What is oil saturation?

In the context of a reservoir, oil saturation is the fraction of the porosity of a zone occupied by oil.

How do you calculate oil saturation?

Fluid saturation is expressed in terms of volume of fluid divided by total pore space.

  1. Gas saturation (Sg) = Vg ÷ Vp.
  2. Oil saturation (So) = Vo ÷ Vp.
  3. Water saturation (Sw) = Vw ÷ Vp.
  4. Sg + So + Sw = 1.
  5. References.

What is critical oil saturation?

Critical oil saturation, Soc For the oil phase to flow, the saturation of the oil must exceed a certain value which is termed critical oil saturation. At this particular saturation, the oil remains in the pores and, for all practical purposes, will not flow.

What is saturation pressure in reservoir?

Predicting Oil Reservoir Performance A saturated oil reservoir has a bubble point pressure of 2100 psi at 175°F. The initial reservoir pressure is 2400 psi. The following data summarizes the rock and fluid properties of the field: Original oil–in–place = 10 MMSTB.

What is saturated oil reservoir?

Petroleum Engineering / By Brandon Tolbert. A saturated reservoir is a reservoir where the reservoir pressure has fallen below the bubble point pressure line. Black oil and volatile oil reservoirs exhibit saturated reservoir behavior, thus their material balance derivations are identical.

What is residual oil saturation?

Residual oil saturation (Srow) is the final value of oil saturation from laboratory waterflood displacement experiments and depends primarily on the flow rate (or differential pressure) applied, permeability and capillary end effects, test methodology and (in many cases) the test laboratory.

Is saturation pressure the same as bubble point?

An oil reservoir whose pressure is above the bubble point (point C in Figure 1-7) is usually referred to as undersaturated. If the pressure is inside the two-phase envelope it is called a saturated, or two-phase, reservoir and may form a gas-cap on top of the oil zone.

What is bubble point of crude oil?

The bubble-point pressure (Pb) of a hydrocarbon system is defined as the highest pressure at which a bubble of gas is first liberated from the oil. This important property can be measured experimentally for a crude oil system by conducting a constant-composition expansion test.

What is saturation in reservoir?

Saturation is defined as that fraction, or percent, of the pore volume occupied by a particular fluid (oil, gas, or water). This property is expressed mathematically by the following relationship: All saturations are based on pore volume not gross volume of the reservoir.

What is an under saturated oil reservoir?

As we discussed in Lesson 2, an undersaturated oil reservoir is defined as a reservoir in which the initial pressure is greater that the bubble-point pressure of the crude oil. This results in a single, liquid hydrocarbon phase in the reservoir.