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Slide 27

The driller had to case and cement the drill pipe into the gas bearing zone in order to keep the gas etc. from getting into and coming up the annular space and escaping into other strata

Next in order to make it possible for the gas to flow into the production pipe, the driller lowers a small controlled “explosive” to the gas bearing strata and sets it off.  It burns/explodes  holes through the production pipe and cement and into the gas producing strata. 

So now the gas should flow out of the gas bearing strata, into the production pipe and up and out to market.  And it will, but too slowly for the driller’s purposes.

In order to make the gas flow more quickly out of the gas producing strata, the driller wants there to be cracks or fractures into the gas producing strata.  The gas can flow more quickly out of the gas bearing strata to the production pipe if there are fractures in the gas bearing strata.

So . . .