PNG 520
Phase Relations in Reservoir Engineering

Advantages of Using Cubic Equations of State


All cubic equations of state have their foundation in vdW EOS. The use of cubic equations of state has become widespread because of their advantages:

  • Simplicity of application
  • Only a few parameters need to be determined
  • Low computational overhead is required to implement them. This was a critical issue, particularly in the early stages of computers; it is not really anymore. Nevertheless, this feature is still a “plus.”

The engineer using cubic equations of state must also be aware of the disadvantages that they all share. The most important ones are the limited accuracy that they can provide, particularly for complex systems. In these cases, the procurement of empirical adjustments through the use of the binary interaction parameters (kij) is essential.