The will fracture the zones progressively from the bottom up, one at a time. After each frac they will analyse the results to ensure that it was performed optimally. They would then tune subsequent fracs to take into account data gathered from those performed previously.
Fraccing is expensive (apparently) and I get the impression that if any of the zones flow commercially they'll stop right there and won't frac further up the hole.
We are only rooted if all the zones fail...
Cheers,
-Disco
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