[ckilmer]

there were no internationals involved

Again, you are confusing oil production companies with well service companies.
...........
exxon is heavily into downstream operations like refining but they only bought an upstream driller xto in 2010

[thackney]

ExxonMobil is not a well service company.

I am talking about the companies the producers hire to do much of the hydraulic fracturing work. These are not companies that own oil wells.

Companies like Halliburton, Schlumberger, Weatherford, etc. That is where most of the expertise exists and these companies already work internationally.