Log-log plot (or derivative plot) in well test analysis

This video presents one of the well testing tools: the log-log plot, also commonly known as derivative plot. This is a very powerful tool that allows us to visualize the flow behaviour around the well, spot the radial flow regime and other flow regimes, detect the presence of boundaries, etc... This presentation should give you a practical understanding of this tool.
All at TestWells.com

[@mohammedghouse235]

Best explanation I have seen so far.

[@abuabdullah9583]

For multiphase fuid rate how would kh calculated

[@koksalan75]

Hi, thanks for the video. However, in the first plot you are displaying you are showing the skin in the middle part where stabilization happens but in the second plot you are showing the skin in the first part of plot where we dont even see or reach stabilization, why? Thanks

[@lanadavina5783]

Thank you!

[@ahmaddangkooban2186]

Very useful video. Thanks :)

[@koksalan75]

Another question that i have is, is it possible from this plot to identify also where (how many meters or kilometers away from the wellbore) the thickness reduction happens? Lets say after 80 hours the derivative moves up again stabilizes due to change in thickness, what does this 80 hours mean? Can we convert hours into length? Thanks a lot.

[@peterlustig2241]

You can do this by application of radius of investigation.
1. Detemine kh for early IARF
2. calculate radius of investigation for time step where you see change in flow regime

[@karthikeyaramaswamy5003]

good explanation

[@Prov3xed]

Thanks a lot ^^

[@franciscosergioappiolaza3069]

Puede mandarlo en español. ..gracias. ....

[@arfadilah1]

thank you!!

[@abuabdullah9583]

For multiphase fuid rate how would kh calculated