That is $100 question the only safe one is as long as it takes all well are different and some not at all.
The odds of a flowing well are not good they are getting better all the time as more information from drilling that comes available.
Example the perth basin 500 well drilled and only 20 wells producing that is from the first well no computer equipment to put down the hole to see what is there everything had to be done long hand.
Look up Oil Feed Technology and subscribe to their free magazine no catch there
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