Best EOS for gas condensate?

guga25 · Post by **guga25** » Thu Jun 07, 2012 6:29 am

I have the following problem, I have a chromatography from a PVT study, but when I simulate the system (line-->separator-->Storage Tank + pipeline) The GOR of the well doesnt match.

I have tried several EOS, all give me results from 2200 to 2300 m3/m3 while according to the PVT and the field production it should be 3200 m3/m3.

So

1) im not using the right EOS
2) the eos dont work or
2) the cromatography is wrong

Bilal Amjad · Post by **Bilal Amjad** » Thu Jun 07, 2012 5:30 pm

I guess you r mistaking in entering the data.

guga25 · Post by **guga25** » Thu Jun 07, 2012 9:24 pm

copy+paste to hysys?

Post by **FANARCO** » Sat Jun 09, 2012 2:59 pm

Dear guga ,,,

In Gas Condensate reservoirs you should collect the sample from surface (recombined). I think you have not matched due to this.

If you collect a downhole sample in Gas Condensate wells, you will get un representative sample.

MikeRam · Post by **MikeRam** » Wed Jun 20, 2012 9:27 am

Your problem is not the EOS, eneither the data. When you try to use a pvt package you first need to calibrate the EOS you chose with experimental data.
You say you have a condensate. If you are using PVTI, you need to intdroduce the composition of the fluid in the reservoir (usually this composition is gotten by recombination). Later you get a phase diagram, and next you need to characterize the plus fraction (in two or three component and find the properties of these pseudocomponents)
With this new composition you get a new phase diagram.
After that you need to perform the regresion process by introducing the experimental data you have, and by telling the package which properties you want to regress or modify (usually the the pseudocomponets properties are the one to begin the process). The process end when you are are able to match the dew pont, the cce, cvd and separator experients.
Later you can use the EOS to make predictiction anywhere.