Pressure conversions for Subsea Systems
Pressure conversions for Subsea Systems
(OP)
Hi All,
I recently noticed a pressure transmitter for a Subsea well, where the downhole pressure transmitter is showing pressure in bara, but not barg. Considering a water depth of 'w' at the well location and well depth of 'd' (depth of downhole gauge), I was confused if barg to bara conversion here would be
1. bara = barg + atmospheric pressure (i.e 1 bar)
or
2. bara = barg + hydrostatic head of the fluid.
My understanding is that we can't go with the 2nd option, as the fluid is not traveling from top to bottom but vice-versa. Also, I'm not very sure if the 1st option is valid here because the pressure measurement is happening some thousands of metres below the Earth's surface. Someone please help. Thanks in advance.
I recently noticed a pressure transmitter for a Subsea well, where the downhole pressure transmitter is showing pressure in bara, but not barg. Considering a water depth of 'w' at the well location and well depth of 'd' (depth of downhole gauge), I was confused if barg to bara conversion here would be
1. bara = barg + atmospheric pressure (i.e 1 bar)
or
2. bara = barg + hydrostatic head of the fluid.
My understanding is that we can't go with the 2nd option, as the fluid is not traveling from top to bottom but vice-versa. Also, I'm not very sure if the 1st option is valid here because the pressure measurement is happening some thousands of metres below the Earth's surface. Someone please help. Thanks in advance.
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RE: Pressure conversions for Subsea Systems
The pressure is being compared to a near perfect vacuum sealed inside the transmitter.
The pressure transmitter is in fact a differential pressure transmitter, with one side connected to this sealed vacuum as the reference pressure.
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