2 replies to this topic

[pmunishankar]

Dear Members,

I am required to analyse the associated gas produced in oil field and assist in installation of compression systems to re-inject gas.

I simulated the network using PIPESIM with OLGA correlations for 2 Phase. I tried to cross check the pressure drop in Asepen HYSYS using PIPESegment unit operation and using Briggs and Brill method for pressure drop calculation. I am surprised to see that the results are no where comparable. I tried using Gas Pipe unit op. Gas Pipe is giving results which are no where comparable with other two.

OLGA is giving pressure drop which is about 1/3 rd of Briggs and Brills of HYSYS. There are some more methods to use also. But I am not sure which is the one to use.

Can anybody suggest me the correct method to use for natural gas flow assurance simulations?

Your help would be highly appreciated.

Thanks and Regards,
Muni Shankar

[ankur2061]

Munishankar,

HYSYS is not truly a pipeline simulator whatever there claims may be.

For multi-phase flow the "OLGAS" correlation is considered superior to any other multi-phase correlation developed.

Refer the link below for some well known models for 2-phase flow:

http://ctes.nov.com/...Flow Models.pdf

The paper mentioned above says that at high GLRs the "Beggs & Brill" over predicts the pressure drop or in other words higher pressure drops are calculated.

Hope this helps.

Regards,
Ankur.

[cleghornp]

or try out http://www.atmosi.co...line-simulation.
It's not multiphase and neither is any other product other than Olga so you'll be hard pushed to verify the results of Olga other than with actual measurements.