Multi-phase pipelines and pumps

[confidential]

Dear friend

I want to ask qusations about Multi-phase

i developed a computer programm to simulate a multi-phase
flow in inclined piplines

I used beggs and brill method for predicting
pressure loss and hold-up ?but is this method valid
for large diameters pipeline (20-40 in)(trunk lines).

I suppose that the two phase pipeline system,is along distance large diameter pipeline this line transports the oil and gas mixture (coming from a gathering sytem which
transports the fluid of many wells).At the head of this line thers is a pumping station,in this station the
mixture is pumped into the trunkline and transported to processing facilities.?
does such a scheme exist in the fields?and if not how should i consider the scheme?

I want to ask about multi-phase pump, that will be used in
pumping station?is there any book or paper which deal with this issue(like horse power calculation ...etc).

if any one can provide me with a good explanation for these issues ,and a web sits that offers a free material
regarding these issues.

Your opinions would be very appreciated

Thanks

 

[DrillerNic]

Multiphase flow is a very large area.....Beggs & Brill's flow map is good for horizontal pipe (although it tends to overpredict liquid hold up). Other flow maps are good under different conditions: Dun & Ros is supposed to be better in high gas to liquid ratios; Hagedorn & Brown is supposed to be best in slug type flow etc. One problem with the flow map appraoch is that it is discontiuous: the equasions for mist flow apply until 'suddenly' the pipe is in slug flow for example. Modern hydraulic simulators have mechanistic models which use flow mechanics (and lots of computation power!).

One observation: If you're bringing the multiphase flowlines from each well/ manifold to a pumping station and then into a single multiphase trunkline, why not put a large separator in front of the pump, separate out a lot of the gas and then have two smaller pipelines?

For Mutliphase Pumps, try talking to Framo Engineering:

http://www.framoeng.no/multiphase_booster_pumps.htm

Also have a look in the SPE website (

http://www.spe.org)

-paper summaries are free, but you have to pay to see the full paper. ther's been quite a lot done recently on long multiphase tie back pipelines.