Guage P correction for Gradient survey in Dry Gas well
Moderator: moderators
-
- Posts: 8
- Joined: Sat Feb 25, 2012 1:04 am
- Location: karachi
Guage P correction for Gradient survey in Dry Gas well
If liquid level is above the gauge measuring point during the well testing or the static pressure survey of gas wells.
How to correct that reservoir pressure? There are two different approaches,
1) First correct the gauge pressure to water level by subtracting liquid head above gauges and then correct that pressure to any depth (Datum / Perforation) by using gas gradient. As the liquid level in the well could be due to condensed liquid. Water gradient in the wellbore may or may not reflect water level in the reservoir. i.e Can GWC movement be inferred from sump level in the wellbore?
2) If the required depth is below the measuring point of gauge, use water gradient otherwise gas gradient.
What is the industry practice to convert guage measured P to datum?
Any suggestions are welcomed.
How to correct that reservoir pressure? There are two different approaches,
1) First correct the gauge pressure to water level by subtracting liquid head above gauges and then correct that pressure to any depth (Datum / Perforation) by using gas gradient. As the liquid level in the well could be due to condensed liquid. Water gradient in the wellbore may or may not reflect water level in the reservoir. i.e Can GWC movement be inferred from sump level in the wellbore?
2) If the required depth is below the measuring point of gauge, use water gradient otherwise gas gradient.
What is the industry practice to convert guage measured P to datum?
Any suggestions are welcomed.