Estimated gas loss thru wet gas pipeline
Estimated gas loss thru wet gas pipeline
(OP)
Hi and Dear All.
Anybody knows how do you calculata estimated nat gas loss ( wet gas) departing offshore at e.g 90 barg, 70C , [75% mole C1, 15% mole C2, 10% mole C3] and reach terminal at 70 barg , 50C with about the same compositions through a PL with 26" X 75 km long?
Gas rate assumed at offshore is at 300 mmscfd.
Note: To do manual calc w/out Hysis, pipesim or Olga
rgds
Anybody knows how do you calculata estimated nat gas loss ( wet gas) departing offshore at e.g 90 barg, 70C , [75% mole C1, 15% mole C2, 10% mole C3] and reach terminal at 70 barg , 50C with about the same compositions through a PL with 26" X 75 km long?
Gas rate assumed at offshore is at 300 mmscfd.
Note: To do manual calc w/out Hysis, pipesim or Olga
rgds





RE: Estimated gas loss thru wet gas pipeline
BTW I can't see a 70C subsea gas line arriving at 50C after 75 km - more like seabed temperature if you ask me.
I can't see how composition would change if all you have is C1,2,3. If you have condensate then some of that will flash off as the pressure falls to change the composition, but not C 1-3.
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Also: There's usually a good reason why everyone does it that way
RE: Estimated gas loss thru wet gas pipeline
Further to this, I am assuming C1,C2 and C3 since I don't have yet the actual compositions. I will hv to get them and manually calc the gas loss.
What I mean gas loss is est gas condensed along the pipeline. Yes, the arrival temp will be seabed temp.
I would like to know how do you calc est gas condensed along PL with say 300 mmscfd wet gas flowrate at the depart P,T without any simulations done.
RGds
RE: Estimated gas loss thru wet gas pipeline
Not sure why you need this, but without some sort of composition analysis or simulation I think it would ne very difficult to do it manually and the answer would be very approximate.
what is your concern / issue? The mass of gas will be the same in steady state over a period of time.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Estimated gas loss thru wet gas pipeline
I am a process eng in Oil & gas co. Basically, operations team in one of our platforms exporting wet gas asking me to est gas loss...they do not have gas meter at depart and landing point..only parameters as I mentioned.
rgds
RE: Estimated gas loss thru wet gas pipeline
It's all much easier in a simulation program....
If they don't have a gas meter at the start and finish, how are they going to measure it?
Remind them that the same mass flow rate in = mass flow rate out.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way