Choke valve datasheet
Choke valve datasheet
(OP)
I have to specify the process data for the choke valve.
The well is having the following conditions
2000 BPD oil with 0% water cut
4000 BPD oil with 50% water cut
In this case, oil is flowing from 3 wells which is combined in a local manifold near the 3 wells and one line is run to the separator/ inlet manifold
I know the line size and line length and the separator/inlet manifold operating pressure.
i modelled the same in the HYSIM with flow from and the choke valve and the piping modelled as pipe segment and terminated with a separator. i fed the operating pressure of the separator and as i have fed the flow , pressure at the upstream of choke valve and fedd all the data required for pipe segment to calculate the pressure drop.
But the model could not get the value of pressure at the choke valve discharge by adding the pressure drop in the piping and the operating pressure of separator to arrive at the choke valve downstream pressure.
when i run the size utility, i am able to get pressure drop for the pipe segments modelled
how to decide the optimum value of pressure drop across the choke valve for with/ without water cut and different separator operating conditions
could anyone resolve this
The well is having the following conditions
2000 BPD oil with 0% water cut
4000 BPD oil with 50% water cut
In this case, oil is flowing from 3 wells which is combined in a local manifold near the 3 wells and one line is run to the separator/ inlet manifold
I know the line size and line length and the separator/inlet manifold operating pressure.
i modelled the same in the HYSIM with flow from and the choke valve and the piping modelled as pipe segment and terminated with a separator. i fed the operating pressure of the separator and as i have fed the flow , pressure at the upstream of choke valve and fedd all the data required for pipe segment to calculate the pressure drop.
But the model could not get the value of pressure at the choke valve discharge by adding the pressure drop in the piping and the operating pressure of separator to arrive at the choke valve downstream pressure.
when i run the size utility, i am able to get pressure drop for the pipe segments modelled
how to decide the optimum value of pressure drop across the choke valve for with/ without water cut and different separator operating conditions
could anyone resolve this





RE: Choke valve datasheet
Specify the pressure in the outlet stream and everything is fine.
If your trailing calculation then gives a wrong pressure in the vessel and you wish to find your pressure at the choke outlet - set up a "adjust" function that will change pressure in your downstream the choke stream until your pressure in your separater matches your required value.
Best Regards
Morten
RE: Choke valve datasheet
Be aware that Hysys can crash when storing large amount of data and case studies in the databook. So, I copy and paste the results into Excel and delete the case study.
I know that there is the optimizer feature, but find the databook much easier to use.
Good luck
Krossview/OK
RE: Choke valve datasheet
If you have the value of CITHP(closein tubing head pressure), your company must have calculation procedure to to get FTHP.
You should provide min/max flowrate/FTHP cases for optimum valve sizing and check also if there is gas lift option in the future. The valve must cover all operating conditions you require.
Use HYSIS in predicting composition at the separator not calculate pressure drop on short piping.
Rgds,
209Larry
RE: Choke valve datasheet
1. defininig a compressible gas pipe with inlet and
outlet streams,
2. set the length to very small number,
3. set the desired operational flow rate of the inlet
stream,
4. initially set the pipe ID and other characteristics
5. decrease the pipe ID until the velocity of the outlet
stream approaches the sound velocity ( mach close to 1).
Hysis does not converge if the velocity equals or
exceeds sound velocity.
In this way one can approximately size the chock valve for the the flowing well head pressure. The downstream pipng can be modeled to set the required constant pressureat of the separator.
RE: Choke valve datasheet