Could be relevant to ACN in the future. My son found it and it's very good. Apologies if it's been posted before.
It's applied to shale in the video, but I've always felt it could be the secret to unlocking our reluctant flows applied to sandstone.Geologists might know better!!
http://www.youtube.com/watch?v=OO-aNBHV4VI&feature=player_embedded
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