Last month we featured Subtle Depletion. To review the examples and quiz answers, see Example A: Gas Zone and Example B: Oil Zone.
This month, we feature False Depletion (i.e., some mechanical problems which can mimic depletion), plus another quiz!
A falsely high ISIP due to momentary packer seat failure as the tool was moved to close the valve at the end of preflow.
This one is obvious but you do need the charts to see this. You cannot simply rely on a scout ticket report of pressures!
A really subtle example of four tests run in succession where the tool slid to bottom on fill, causing a squeeze pressure which did not dissipate.
The pressure depth plot shows a useful way of 'spotting' such false pressures.
1. Do these two DSTs run in the same wellbore show true depletion?
2. If not, what are the two possible clues that the depletion is false?