BTW, we're not pulling oil from the "center of the earth"

It's in the lithosphere, which is the top roughly 70 Km of the earth.

The Deepwater Horizon was drilling at a depth of 13 Km into the lithosphere.



The center of the earth would be another 6500 Km below that.

http://www.geologyrocks.co.uk/glossary/lithosphere

The Earth is BIG, guys.