How to calculate pressure of a mixture of oil Reservoir fuids?

In summary, the conversation discusses calculating the reservoir pore volume and initial gas in place for a specific formation, as well as determining the recovery factor. The formation has a total bulk volume of 1E8 m^3 and contains a gas mixture with varying compositions. The reservoir pressure and temperature are also given, along with conversions for different units. The real gas law is mentioned as a way to calculate the values, and the importance of the recovery factor is highlighted.
  • #1
marcoskids
14
0
1. Homework Statement

Calculate reservoir pore volume in field units and initial gas in place for a formation with total bulk volume of 1E8 m^3. A sample of the reservoir gas mixture has
15 moles of CH4 (Tc = 191K),Pc = 46.1bar),
2 Moles C2H6 (Tc =306K, Pc = 48.8 bar)
3 Moles C3H8 (Tc = 370K, Pc - 42.5 bar)

Reservoir pressure at midpoint of production pay zone is 250 bar whilst that corresponding to half pore volume is 206 bars.

Porosity = 0.15. Connate water saturation = 0.25, Reservoir Temperature = 950C

1barrel = 160 litre, 1000 litre = 1m^3, 1ft = 0.3m, 1bar= 0.1 Mpa

R = 8.314 Kpa*m^3 / kgmole*k

K = degrees C + 273, βg = 3.74E-4Z(T/P), T in K and P in Mpa
2.
Real gas law = PV = ZnRT

3. I know that Pore volume = Bulk volume * Recovery factor but I don't know how to get this recovery factor value.
 
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  • #2
The recovery factor for a reservoir is determined by the hydrocarbon characteristics of the formation and depends on factors such as the type of hydrocarbon present, the reservoir pressure, temperature, and porosity. It is typically estimated from laboratory experiments or simulations.
 

1. How do I calculate the pressure of a mixture of oil reservoir fluids?

To calculate the pressure of a mixture of oil reservoir fluids, you will need to use the ideal gas law, which states that pressure (P) is equal to the product of the gas constant (R), temperature (T), and the number of moles of gas (n), divided by the volume (V). The formula is written as P = (nRT)/V. You will also need to know the mole fraction of each component in the mixture and their individual pressures. You can then use the formula for partial pressure (P1 = X1 * Ptotal) to calculate the pressure of each component. Finally, you can sum up the partial pressures to get the total pressure of the mixture.

2. What is the ideal gas law and how is it used to calculate pressure?

The ideal gas law is a fundamental law in thermodynamics that describes the relationship between pressure, temperature, volume, and number of moles of a gas. It states that when a gas is in a closed system, the product of pressure and volume is directly proportional to the product of the number of moles and temperature. This law is used to calculate pressure by rearranging the formula to solve for pressure (P = (nRT)/V).

3. How do I determine the mole fraction of each component in a mixture of oil reservoir fluids?

To determine the mole fraction of each component in a mixture of oil reservoir fluids, you will need to know the number of moles of each component present in the mixture. You can calculate this by dividing the mass of each component by its molecular weight. Then, you can divide the number of moles of each component by the total number of moles in the mixture to get the mole fraction. This represents the proportion of each component in the mixture.

4. Can I use the ideal gas law to calculate pressure for all types of fluids?

No, the ideal gas law is only applicable to ideal gases, which are gases that have low densities and high temperatures. It does not account for intermolecular forces or non-ideal behavior. Therefore, it should not be used to calculate pressure for liquids or gases at high pressures or low temperatures. In these cases, other equations such as the van der Waals equation or the Peng-Robinson equation should be used.

5. What factors can influence the pressure of a mixture of oil reservoir fluids?

The pressure of a mixture of oil reservoir fluids can be influenced by several factors such as the temperature, the number of moles of each component, and the volume of the system. Additionally, the presence of impurities or non-ideal behavior can also affect the pressure of the mixture. It is important to consider all of these factors when calculating the pressure of a mixture of oil reservoir fluids.

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