Pipephase Simulation

[WeiJieYap]

I am currently using pipephase 9.1 to determine pressure & temperature profile and flow regime of a pipeline (120km). The pipeline consists of gas condensate which is fully vapour at 55 bar, 55C (from booster pump and cooled down by an air cooler).

My question is will the simulation take into account of condensation when the content reached pipe ambient temperature (26C) ?

To more specific for pipephase user, my fluid type is "gas condensate", as for condensate source input
P = 55 bara
T = 55C
Condensate gas ratio = 0 ( as it is fully vapour at that condition)
And the result summary showing no condensation occur throughout the pipeline which i highly doubt it (
When i tried to change the condensate gas ratio to let's say "8", it did give expected result

So what i am trying to find out is how do we define the condensate gas ratio input ?
from my understanding is the Sm3(in liquid volume)/ Million Sm3 (in gas volume) at the current condition which is 55C and 55bar.


Has anyone came across this ? And how do we actually know it takes into account of condensation from result ? liquid holdup ? etc

thanks in advance

 

[dcasto]

you can only get that from lab data. You need to know the composition. If the gas were 100% methane, it would have a zero ratio as would a gas with 100% ethane, There combinations of gas that have a zero ratio even with hexanes.

 

[BigInch]

And 26C can still be relatively "hot" for a lot of gases.

You'll know when you "validate" your Pipephase model.

 

[WeiJieYap]

the content consists of crude oil ligthends ranging from lets say 1.5% wt Naphtha C5+ 10% C5 and rest <C4-1

the problem is it is a range of unspecified components

Currently im trying to get the simulation work by plotting an assay (TBP curve) which keeps giving me errors earlier on

But the question is will the simulation take into account of V-L equilibrium by using gas condensate option ? As in when P&T drop, minor condensation will occur to that 1.5% naphtha and will the simulation calculate it ?

 

[BigInch]

I, not being a user of Pipephase, can't comment on that.
But you should be able to verify (by other calculations or by comparison to a program's output for a similar problem with a known solution) what it is doing, or ... you really shouldn't be using it, right?

 

[KernOily]

You asked:

"But the question is will the simulation take into account of V-L equilibrium by using gas condensate option ? As in when P&T drop, minor condensation will occur to that 1.5% naphtha and will the simulation calculate it ?"

Answer: I think it will, but you need to call up SimSci and ask them that question. I don't use the Condensate option, but in general, V-L phase behavior prediction is what you get with Pipephase unless you are running single phase liquid only. Plus you want to see what is flashing, and when, so you need to run as Compositional. That is what I would do.

Have you tried running this as Compositional-Blackoil? Unspecified components are treated as blackoil. In my opinion you should not mess with Condensate unless your system is running single phase liquid. ALways run Compositional and treat the unknown HC components as blackoil. Again, SimSci will be able to help you with this.

If your model is set up right, and you still don't get any condensation, then by George, you don't get any condensate.

I would still put a separator at the outlet end of the pipeline...