Hi All,
So i have contributed to a project on one of the gas processing plant facility where gas is collected from wellheads and transported.
We have got three wellheads,HP Section,IP Section,LP Section, HP Compressor section,LP Compressor section, TEG Gas dehydration,TEG regeneration,Gas metering station,crude metering station and other utilities like fuel gas system,cooling water system,Waste heat recovery system etc.
ESD flow sheeting was done,Graphics were prepared for FOD and mimicked DCS as this was an in house project.
Modelling challenges:
Separation of gas and liquids in separators.
Vapor fractions.
Water-TEG interactions.
Hot oil properties which is used in regeneration section.
Most interesting part is taking a start up when ESD is activated.
We tried three ways of pressurising the system.
1) Using gas trunkline system. Which act like a source and sink.
2) Using fuel gas system- note here we have to completely change the model as reverse line has to be defined for doing this which was not considered during modeling phase.
3) Creating a hose connection near HP separator for Fuel gas.
The process looks easy but taking a startup with ESD activated is not that easy.
There will be many facilities available in offsite gas plant like desalter, Amine treating and regeneration systems, there will be compressor train in transportation line.Then Liquification.
For example:
All these things need to be done because the shutdown valves at 3 wellheads will not open until the downstream to get some pressure.
Reversible line has to be defined here as well to sense the pressure.
So i have contributed to a project on one of the gas processing plant facility where gas is collected from wellheads and transported.
We have got three wellheads,HP Section,IP Section,LP Section, HP Compressor section,LP Compressor section, TEG Gas dehydration,TEG regeneration,Gas metering station,crude metering station and other utilities like fuel gas system,cooling water system,Waste heat recovery system etc.
ESD flow sheeting was done,Graphics were prepared for FOD and mimicked DCS as this was an in house project.
Modelling challenges:
Separation of gas and liquids in separators.
Vapor fractions.
Water-TEG interactions.
Hot oil properties which is used in regeneration section.
Most interesting part is taking a start up when ESD is activated.
We tried three ways of pressurising the system.
1) Using gas trunkline system. Which act like a source and sink.
2) Using fuel gas system- note here we have to completely change the model as reverse line has to be defined for doing this which was not considered during modeling phase.
3) Creating a hose connection near HP separator for Fuel gas.
The process looks easy but taking a startup with ESD activated is not that easy.
There will be many facilities available in offsite gas plant like desalter, Amine treating and regeneration systems, there will be compressor train in transportation line.Then Liquification.
For example:
All these things need to be done because the shutdown valves at 3 wellheads will not open until the downstream to get some pressure.
Reversible line has to be defined here as well to sense the pressure.
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