RE: This was supposed to be a tech play, not geo Well then: If this was only a technical play then we must assume it was a technical failure. Lots of things can go wrong with a frac.
My concern is with the well spacing / drainage radius (cylinder for horizontal wells). Yingling talked about spacings of 4 wells per section, or 28 wells on their 7 sections of land. Elsewhere there is discussion of the 2,744 meter horizontal leg through the Montney formation.
A section of land measures 1 mile on each edge. This is 1,600 meters across. Clearly then, these long reach horizontal impact more that 1 section each. So the rational of 1 well per quarter section or 4 wells per section seems to loose meaning.
Things typically get pushed to their breaking points. I suspect that the breaking point with long reach horizontal product wells might be when they pump a frac down one well and it ends up in the production stream of the neighbours well.