I am glad you like FrackNation, it really is an eye opener, I didn't believe it was possible to produce such blatant lies and call it a documentary till I became a Petroleum Engineer and watched Gasland.
To answer your question about taking oil out of the ground, you are looking at oil reserves the wrong way. It isn't like water aquifers, where there is just a giant pool of water underground, and when the water is gone there is nothing left. When we say Oil Reservoir, it isn't like a giant liquid bubble underground that we suck out with a straw. An oil rich rock acts a little like a sponge, where the hydrocarbon molecules go in tiny holes in the rock, referred to as porosity. However a sponge can hold WAAAAAY more water than a rock can hold oil. To compare, for every cubic foot of Oil Shale or Sandstone, we only get about 1 teaspoon worth of oil out of it. The structural integrity of the rock is the exact same after the hydrocarbons are removed. That's why the Middle East hasn't been reduced to nothing but a giant sinkhole.
The water they pump down there isn't to "replace the oil" as you said above, most of the water that gets pumped on a frac comes back up as soon as you turn the well on. The water opens tiny cracks in the shale, which sand then goes into and holds these tiny cracks open. The water then leaves, the sand stays, and the cracks stay open. This increases the surface area of your well on the payzone by a factor of thousands.
As to the chemicals they use for frac'ing, the days of "mystery chemicals" are all gone. You can go onto your state Oil and Gas website (COGCC.state.co.us for Colorado) and look up any well near your house, and the Operating company is required to report every chemical and frac design they pump in their Completions Report. FracFocus.Org is another great website, look up any well you want, and FracFocus tells you exactly what is in each chemical, and down to the gallon exactly how much was pumped.
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