atocha project update - hm brian no.1 perforat, page-56

"Most gas wells in the US" rely on fraccing as stated below in the extract from:

http://en.wikipedia.org/wiki/Hydraulic_fracturing

"Drilling a borehole or well involves applying downward pressure to a rotating drill bit. This drilling action produces rock chips and fine rock particles that may enter cracks and pore space at the wellbore wall, resulting in damage to the permeability at and near the wellbore. The damage reduces flow into the borehole from the surrounding rock formation, and seals off the borehole from the surrounding rock. Hydraulic fracturing can be used to bypass this damage.

Hydraulic fracture stimulation is commonly applied to wells drilled in low permeability reservoirs. Most gas wells in the US rely on hydraulic fracturing to produce gas at economic rates."

I hold PYM & PRA but their HC posts are few & far between; there is a lot more to be learnt from this stimulating site.