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[EvenSol]

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[GrandZangoule]

Hello all, I have a couple of questions:

1. How do I get the mole fraction of each component in the different phases?
2. Does the package calculate Dew/Bubble point Temperatures and pressures?

[EvenSol]

Hi.
1.
How do I get the mole fraction of each component in the different phases?

#Mole fraction of a component in total fluid
fluid1.getComponent('methane').getz()

#Get mole fraction of a phase (moles in phase/total number of moles)
fluid1.getPhase('gas').getMoleFraction()

#Mole fraction of component in a phase of type gas, oil or aqueous:
fluid1.getPhase('gas').getComponent('methane').getx()
fluid1.getPhase('oil').getComponent('methane').getx()
fluid1.getPhase('aqueous').getComponent('methane').getx()

#Mole fraction of component in phase number 0..n - where order is from lightest to heaviest:
fluid1.getPhase(0).getComponent('methane').getx()

#and mole fraction for first added component( component number 0) in th lightest phase:
fluid1.getPhase(0).getComponent(0).getx()

#molar composition
fluid1.getMolarComposition()

You can see some examples here:
https://colab.research.google.com/github/EvenSol/NeqSim-Colab/blob/master/notebooks/emptytemplate.ipynb

2. Does the package calculate Dew/Bubble point Temperatures and pressures?
   Yes. You use the dew point temperature and dew point pressure methods in https://github.com/equinor/neqsim/blob/master/src/main/java/neqsim/thermodynamicOperations/ThermodynamicOperations.java

[GrandZangoule]

Thank you very much for your quick response. Your answer to question #1 was exactly what I needed.
For question #2, I could not find the function to use to calculate or obtain the Bubble or Dew point. I tried a few functions but had errors. Please help with the correct function calls.

Thanks again.

[EvenSol]

These examples might be usefull:
https://github.com/EvenSol/NeqSim-Colab/blob/master/notebooks/gasquality/hydrocarbon_dew_point_of_natural_gas.ipynb.

You can run the following script in Python:

# Calculation of dew and bubble points

import neqsim
from neqsim.thermo.thermoTools import dewt, bubt,bubp, dewp, fluid
import matplotlib.pyplot as plt

fluid0_HC = fluid('srk')
fluid0_HC.addComponent('methane',0.7)
fluid0_HC.addComponent('ethane',0.1)
fluid0_HC.addComponent('propane',0.1)
fluid0_HC.addComponent('n-butane',0.1)
fluid0_HC.setMixingRule("classic")

fluid0_HC.setPressure(10.0, 'bara')
fluid0_HC.setTemperature(0.0, 'C')

dewtemperature = dewt(fluid0_HC)
print('dew point temperature ', fluid0_HC.getTemperature('K'), ' K', ' pressure ', fluid0_HC.getPressure('bara'), ' bara')

#set inital guess
fluid0_HC.setTemperature(-140.0, 'C')
bubtemperature = bubt(fluid0_HC)
print('bubble point temperature ', fluid0_HC.getTemperature('K'), ' K', fluid0_HC.getPressure('bara'), ' bara')

#set inital guess
fluid0_HC.setTemperature(-50.0, 'C')
fluid0_HC.setPressure(30.0, 'bara')
bubpressure =bubp(fluid0_HC)
print('bubble point pressure ', fluid0_HC.getPressure('bara'), ' bara ',  fluid0_HC.getTemperature('K'), ' K')

#set inital guess
fluid0_HC.setTemperature(275.0, 'K')
fluid0_HC.setPressure(30.0, 'bara')
dewpressure =dewp(fluid0_HC)
print('dew point pressure ', fluid0_HC.getPressure('bara'), ' bara ',  fluid0_HC.getTemperature('K'), ' K')

from neqsim.neqsimpython import jNeqSim
thermoOps = jNeqSim.thermodynamicOperations.ThermodynamicOperations(fluid0_HC)
thermoOps.calcPTphaseEnvelope()

plt.plot(list(thermoOps.getOperation().get("dewT")),list(thermoOps.getOperation().get("dewP")), label="dew point")
plt.plot(list(thermoOps.getOperation().get("bubT")),list(thermoOps.getOperation().get("bubP")), label="bubble point")
plt.title('PT envelope')
plt.xlabel('Temperature [K]')
plt.ylabel('Pressure [bar]')
plt.legend()
plt.show()

Output:

dew point temperature 274.8507677589821 K pressure 10.0 bara
bubble point temperature 155.42940315451594 K 10.0 bara
bubble point pressure 65.1502714869753 bara 223.14999999999998 K
dew point pressure 10.06055839453803 bara 275.0 K

[GrandZangoule]

Worked perfectly. Thank you very much. Your routines are awesome. I have some ideas I'm working on and will like to collaborate with your team on the near future.

Thanks again.

[GrandZangoule]

How do I suppress this and any other messages?
error could not calculate

[EvenSol]

The message is printed in the thermoTools.py that you import and use. One option can be to call neqsim directly and not via thermoTools.

The other option will be to disable logging (however this is not available in the current release).
import logging
logging.disable(logging.CRITICAL)

You can test it from github:
pip install git+https://github.com/equinor/neqsim-python.git

[UmudMomun]

Hello everyone,

I am a beginner in Google Earth Engine (GEE) and I want to detect methane plumes using satellite data. However, I am having trouble implementing this in GEE because my coding and remote sensing background is not strong.

Could anyone share some example scripts, tutorials, or step-by-step guidance on how to identify methane plumes in GEE? Any help or resources would be greatly appreciated!

Thank you very much!

Best regards,
VM

[EvenSol]

Dear VM.
This is a very good suggestion. We are working with google earth engine in relation to NeqSim and field development and will put out some examples in future. I would be glad to hear how you end up getting methane plums satellite data into google earth.

When it comes to methane emsissions and neqsim you can have look at the following papers:

1. Industrial Case Study: Application of Current Capabilities in Methane Measurement at Equinor's Hammerfest LNG Facility, 2025
2. Virtual Measurement of Emissions from Produced Water Using an Online Process Simulator , TEKNA produced water conference, 2025