two phase pressure drop
two phase pressure drop
(OP)
I have to perform the two phase pressure drop for the oil flowing from the wellhead to the inlet manifold at the station via the choke valve and manifold.
known data are flow rate, wellhead flowline presssure and temperature and water cut.
Seeking help to the do the above
known data are flow rate, wellhead flowline presssure and temperature and water cut.
Seeking help to the do the above





RE: two phase pressure drop
http://www.sis.slb.com/content/software/production/pipesim/index.asp?seg=www%2Ebakerjardine%2Ecom&
for information
RE: two phase pressure drop
Thanks!
Pete
RE: two phase pressure drop
But for simple hand calculation, use "Duckler" corelation. Not so accurate but go enough for design purpose.
RE: two phase pressure drop
Hi,
To what 2-phase flow packages do you have access?
Pipephase, Pipesim and OLGA can do the job. However, should
you plan to build your own routine, I would suggest you to
use Beggs & Brill correlation for horizontal and near
horizontal 2-phase flows). A bit more complicated approach
would be writing routines for mechanistic models.
Also, there are several correlations to calculate flow
of complex G-L mixtures through restrictions, but make sure
to check whether the flow through the choke is critical.
Hope that helps. Good luck!
---Fausto
RE: two phase pressure drop
I guess I would disagree about using Dukler or BBM for design purposes. I have done this exact work a ton of times and speak from experience. BBM, Dukler, etc. will get you a number for dP but you may be WAY off due to the reasons cited above. In my practice I would never use one of those for a gross production stream UNLESS I had bulletproof lab and/or field data that showed (1) there was virtually no emulsion phase (2) the tendency to form an emulsion is small (3) the nature of the liquid phase flow is well-known, i.e. oil-water slug or plug flow, or oil-water stratified.
If your need is critical I would find a consultant who has the Pipephase software. You should be able to get this calculation done for a few hundred bucks.
Thanks!
Pete
RE: two phase pressure drop
If you want a WILD guess for the answer, go ahead and use Dukler or BBM for the dP correlation. You can conservatively bracket the solution by assuming that the liquid phase is 100% crude oil since it has the higher viscosity of the two liquids. Run your calc and get your dP/velocity/pipe size answer.
Now, take that crude viscosity number and increase it by 1.5x to assume the liquid phase is 100% emulsion since typically crude-water emulsion viscosities are about 1.5x-2x that of crude oil. Now run your dP calc again and select a different pipe size if needed.
Thanks!
Pete
RE: two phase pressure drop
If you are using the OLGA steady state correlation with either PIPESIM or PipePhase, keep in mind there are 2 versions of this correlation - the most common used one being the OLGA 2-phase which treats the oil and water as a homogeneous liquid. OLGA 3-phase accounts for slip between the water and oil.
Hope this helps!
Mack
RE: two phase pressure drop