8 replies to this topic

[john500]

has anybody done hysys simulation for FPSO oil and gas speration process module.I am bit confused how to define feed composition in hysys.gas in mmscfd and liquid in bpd.does mmscfd includes liquid content also or we need to define separately gas and liquid.Somebody please help me.

[Steve McGahey]

G'day Murali Mohan (can you tell me if I should address you as Murali or Mohan),

I do a lot of FPSO oil and gas work.

Normally, I would define the gas composition in mole %, and specify the overall flowrate in MMscfd. You can choose the units you are inputting in, just by typing in a number, and then selecting the units of measurement before hitting enter.

Same goes for liquids in bpd.

In my experience, the MMscfd question depends entirely on who wrote the specification you're referring to. Best to check with them if they have not been explicit. In the absence of other information, I would suspect it refers to a gas (including condensate), without the aqueous content.

Hope this helps.
- Steve

[john500]

Thanks a lot Steve,My full name is Murali Mohan,you can call me Murali

[john500]

Stveve I am process engineer basically worked in EPC comany for desigining pharmacuticals plants,now i joined in oil and gas comapny for desigining FPSO process and compressors modules.Its first time for me to carryout simulations for FPSO design in HYSYS.I am trying to learn fast so that i can catch up with the work.

My jobs scope is to carryout hysys simulations for FPSO and line,vessel sizing for separatotrs,blowdown calculations ,etc

What i understood from you is we just need to define the feed in MMscfd flowrate and its composition in mole%

This MMscfd includes oil content also and we dont need to specify the liquid content in bpd in the feed to the sperator that is coming from oil wellhead

Correct me if i am wrong,if u had any basic information with regards to FPSO and hsyys simulations files for reference please help to guide me.my eamil id is
muraali28@gmail.com

Thanks
Murali Moahn

[Dtan76]

Hi

Modelling in

Attached Files

•  PFD_GasSatKOPot.pdf   6.68KB   330 downloads

[Dtan76]

Hi

Modelling in HYSIS is much easy and user friendly as well. Enclosed please sample I did for 2-phase separator (knock out drum). Make sure you know how to define stream compositions using (Ctrl- Basic Simulation Manager, then create your fluid package. Normally for Top side / crude processing, Peng Robinson package is good enough.

Regards

[john500]

Thanks Dtan for your reply.

As I am new to FPSO design system I am facing some difficulties in understanding the concept involved in it.

Please refer to the below information that I got from client for which i have to design and provide p&id with line and vessel sizes for bidding.

Here is the client basic design conditions

The objective is to generate a reasonable cost and schedule for a FPSO process unit.


Incoming fluid 80,000 bblspd

Max water 60,000 bblspd towards end of field life

Max oil 60,000 bblspd

Arrival pressure at FPSO 200 Pisg Min

Arrival temperature at FPSO 4 deg C Min

Arrival temperature at FPSO 24 deg C

Assume H2S isminimal but NACE will apply to all topisde components.

what is meant by NACE will apply to all topside components?

The client has not given feed composition and my boss asked me to assume feed composition from standard specs.

Client given feed flow as 80 000 bblsd which I belvie is liquid and what about gas then.he has not given any gas like MMscfd anything like that.

What could be the best way to carryout simulation for the above?

In the PFD client has given test seperator,1st stage separator ,2nd stage separator,electro static coalescer,ships slop tank,hydrocyclone,floating cell and HP,LP knockpout drums.

Whta is the use of test separator and what is its importance.Is this used during only start up time or will it be under continous operation like other separators.

I require help and guidance for the above simulation followed by line and vessel sizing.

Please help to guide me.

thanks,
Murali Mohan

[Steve McGahey]

The Test separator is used by the operators sporadically to check out the liquids coming from a particular well. It's kinda like a pilot-plant for the first stage separator, only instead of testing the equipment, you're testing the feed materials.

NACE refers to the standards/quality of the materials of construction. I think NACE is the National Association of Corrosion Engineers or something - but I'm not usually getting involved in materials selection, so I can't be sure.

"The client has not given feed composition and my boss asked me to assume feed composition from standard specs." You should be able to find some standard well compositions on the internet. Look for oil/gas field names... Block 18, Buzzard, Angostura... things like that. You'll find a listing of compositions out there.

"In the PFD client has given test seperator,1st stage separator ,2nd stage separator,electro static coalescer,ships slop tank,hydrocyclone,floating cell and HP,LP knockpout drums." No gas treatment stuff, like compressors or dewpointing equipment? Sounds like it's a low-gas-production well. Might be predominately heavy components. Keep that in mind when trying to choose the compositions as suggested in the last paragraph.

[JoeWong]

Murali,

First, some advice : Following the "Good Practice", you should create a new thread/topic for new query. This to ease for identification, searching, etc.

i) Yes. Steve is right. NACE is the National Association of Corrosion Engineers.
You can easily "google" its website...

When we say design for NACE, common understanding is the material of contruction (MOC) is NACE MR 0175 / ISO 15156-1 compliant. This requirement is main due to high H2S content present in the fluid which results Sulfide Stress Corrosion Cracking (SSCC) of MOC.

Present of H2S in fluid, you may not only needs to assess the MOC but you may needs to check distribution of H2S in fluid especially those vent and flare gas.

ii) Your client did not provide feed composition. Feed compisition seriously affect requirement on topside facilities. Simply select some feed composition may lead to serious rework. Suggest you check with your client (or your lead) where the platform is located and you use those feed composition of existing platform near this area.

iii) Your feed may contain flashed gas at arrival condition and quantity of flash gas subject to feed composition.

iv) The arrival temperature is at 4 degC. Please assess hydrate formation which potentially results partial blockage of pipeline.

v) Test separator is normal to use to carry out well testing and to understand the performance of well and reserviour. Sometime it use for well unloading and well cleaning.

Hope above helps.

JoeWong