For the well test data and plots below answer to a$-$c $($here are the possible cases$)$: $(20$ points$)$

a$.$ Identify on the plots the periods corresponding to

$$ WBS

$$ Skin $($positive or negative$)$

$$ Well$/$reservoir

$$ Boundary & its type $($write the letters next to the plots$)($i$.$e$.$ closed, constant pressure, etc.$)$

b$.$ Identify the flow regimes $($i$.$e$.$ radial, linear, etc..$)$ and sketch of the well$/$reservoir$/$boundary

which can represent the depicted diagnostic plots $($you can pick from the sketches above$).$

c$.$ What should be the y$-$axis on their flow$-$regime$-$specific diagnostic plots? $($Hint: n$?$ dp$/$dtn$)$