Mean metal temperature during blowdown
Mean metal temperature during blowdown
(OP)
Well not quite a blowdown:
Situation: I have a "reservoir of gas", actually a well of gas under pressure behind a choke. Those familiar with drilling it is the choke located after the choke line in a well intervention / kill situation.
After the choke the gas will flow to a mud/gas separator which operates at atmospheric conditions. I need to perform a calculation to see whether hydrate formation downstream of the choke is possible. Using a simple flash in Hysys, and a 50C upstream temp hydrate formation will occur - however this is effectively a blowdown and the pressure will reduce quickly.
The question is how do I account for metal mass at atmospheric temp (i.e. approx 20C) in the calculation. My feeling is to use the flash temp is too conservative. Any views?
Cheers
Situation: I have a "reservoir of gas", actually a well of gas under pressure behind a choke. Those familiar with drilling it is the choke located after the choke line in a well intervention / kill situation.
After the choke the gas will flow to a mud/gas separator which operates at atmospheric conditions. I need to perform a calculation to see whether hydrate formation downstream of the choke is possible. Using a simple flash in Hysys, and a 50C upstream temp hydrate formation will occur - however this is effectively a blowdown and the pressure will reduce quickly.
The question is how do I account for metal mass at atmospheric temp (i.e. approx 20C) in the calculation. My feeling is to use the flash temp is too conservative. Any views?
Cheers





RE: Mean metal temperature during blowdown
There isn't enough heat capacity in the steel in the system and heat transfer from the air is extremly little.
RE: Mean metal temperature during blowdown
Best regards
Morten
RE: Mean metal temperature during blowdown
It is an oil well, scenario being that gas has settled out at the top of the well for some reason (maybe a kick etc). This gives a limited volume of gas - maybe 500ft in the casing is realistic.
What were your thoughts?
RE: Mean metal temperature during blowdown
Best regards
Morten