2 Phase Flow Spreadsheet

[GregLamberson]

Has anyone tried a TwoPhase Flow Calculation Spreadsheet from the Chemical Processing 2000 Fluid Flow Annual Desktop Reference? It is available as an Excel download at

http://www.rivercityeng.com/papers.html

Just curious if anyone is familair with it and if so, thoughts?


Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[BigInch]

Greg,
I haven't tried it.
Do you want to compare it against mine?


BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[zdas04]

I do it in MathCAD and take all of the correlations with a large grain of salt. A couple of ergs of energy one way or another and the flow regime changes and the correlation is out the window. I like both Duckler and Flannigan for the problems they are suited for, but no correlation, calculation, or spreadsheet will work for the subtleties that are rife in this field.

David

 

[dcasto]

It would be interesting, spread sheet versus WinSim, want to a test?

 

[GregLamberson]

I would be interested in thoughts/comparisons against what you guys use.

If it is comparable, that's great - it's free. Sometimes though you get what you pay for........

Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[BigInch]

Probably not much difference in overall results between a good design done using a spreadsheet or Winsim or Olga or any other tool, when you consider the changing flows patterns you get out of a gathering system over the life of the field and a spreadsheet is faster. Take all 2-phase results not only with a grain of salt.. 2x800 mg asprin also helps.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[MortenA]

Binginch (-:

BTW the predicted SS pressure drop will differ much from model to model and will predict eg different pipe sizes and different size for slug catchers etc.

Best regards Morten

 

[BigInch]

Right. I take the maximum dP of several predictors using all basic elevation profiles.

I wouldn't trust any prediction of slug size. Trying to get a conservative bracket, do you think sizing using a slug based on a volume determined by using the diameter and maximum outlet pressure's ability to lift a column of liquid with a given SG would do it?

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[MortenA]

Well - just as often as not wee will quite simply say twice the riser volume for a remote tie-in via a multiphase pipwline.

This seems to work - but n the other hand - I have never had a decent feed back from the operators who has to struggle with this set up so....

Being a consultant i have found an increasing demand for doing more detailed calculations. What the actual cause of this increase is dont really know. One guess could be that the models _are_ getting better and the computing time is getting down to a reasonable level?

Best regards

Morten

 

[BigInch]

That sounds reasonable for a configuration that has a well defined "riser", such as I imagine you are describing, a 2-phase gathering flow line to a production platform. Where an outlet configuration might have a gradual profile, it would be difficult to evaluate that length parameter.

Data input and interpretation time increase as well.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com