[ckilmer]

Halliburton has been doing hydraulic fracturing since the 1940s............
...........
Yes hydraulic fracturing as been done since the 1940’s.

However the combination of hydraulic fracturing and horizontal drilling has only been done since about 2001. It was developed for natural gas in the barnet formation in Texas and then ported to Marcellus formation in PA in 2006 by purely regional American players. About 2008-9 they started experimenting with fracking oil. there were no internationals involved.

[thackney]

It was developed for natural gas in the barnet formation

Horizontal drilling, a very separate job from hydraulic fracturing, is also older than the shale production and not limited to the use of tight formations. We did a lot of that in Alaska to limit the production pad size while covering a far larger area underground.

About 2008-9 they started experimenting with fracking oil

You are several decades behind.

http://www.spe.org/jpt/print/archives/2010/12/10Hydraulic.pdf

[thackney]

there were no internationals involved

Again, you are confusing oil production companies with well service companies.