Guage P correction for Gradient survey in Dry Gas well

Well Test Analysis, Pressure and Production Monitoring........ etc.

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umair.shafeeq
Posts: 8
Joined: Sat Feb 25, 2012 1:04 am
Location: karachi

Guage P correction for Gradient survey in Dry Gas well

Post by umair.shafeeq »

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.
malafat
Posts: 7
Joined: Fri Dec 10, 2010 11:59 pm

Post by malafat »

It depends what do you have within the tubing string? Is there any prior liquid production? or just a dry gas? Dont forget within the tubing you might have a multiphase mixture of oil gas and water which can hold up at the bottom below the gauge?
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