Hi Ell1949, I have put this up before to show what's what in the frac plugs and drilling them out! its about 4 mins long, but its show what they do from start to finish! and when you see the plugs in place it shows how muck flow is reduced. approx 2/3? enjoy all that haven't look as yet?
Thanks for the info.
Dr
http://www.youtube.com/watch?v=j3VG3nfastI