How do I calculate water-gas-air ratio is a wellbore?
How do I calculate water-gas-air ratio is a wellbore?
(OP)
Hi all,
I'm trying to determine the amount of water,gas and air I have in a well. The well PBD is 691m and we tagged the fluid level at 583m. The casing is 4.5" OD (117.93 m/m3)so I know I have 0.92m3 of fluid.
The pressure has built up to 4500 kPa. I want to know how many e3m3 of gas are in the wellbore (primarily CH4) and what the ratio of air:gas is to ensure we don't have an explosive mixture when we go back in to do a workover.
I also need to calculate the water-gas ratio in m3/e3m3.
Either I'm overthinking this or missing something that should be blatantly obvious. Any thoughts?
I'm trying to determine the amount of water,gas and air I have in a well. The well PBD is 691m and we tagged the fluid level at 583m. The casing is 4.5" OD (117.93 m/m3)so I know I have 0.92m3 of fluid.
The pressure has built up to 4500 kPa. I want to know how many e3m3 of gas are in the wellbore (primarily CH4) and what the ratio of air:gas is to ensure we don't have an explosive mixture when we go back in to do a workover.
I also need to calculate the water-gas ratio in m3/e3m3.
Either I'm overthinking this or missing something that should be blatantly obvious. Any thoughts?





RE: How do I calculate water-gas-air ratio is a wellbore?
One way would be to get a downhole gas sample with a downhole bomb, then do a gas analysis. That would give you the fractions of air and CH4 (and everything else) in the wellbore.
Thanks!
Pete