It is not weird, "sequencial" (sic) nor "arbitary" (sic).
Your idea of "industry practice" is simply that one numbers the first hole 1, the second 2, the third 3, ...
It is more complicated than that. There are many possible reasons.
Any thought that Bollinger was kept secret for some 80 holes is pure fantasy.
Even the announcement would have told you that they are moving the rigs around. They have many hotspots and on this occasion a hotspot became even hotter.
SIR Price at posting:
$2.85 Sentiment: LT Buy Disclosure: Held