If ever Al-Queda penetrated into the heart of al Abqaiq and got off a big Kaboom that shut down the site for even a month, spike in crude would be beyond my imagining.
But i feel there is a lot more then just the Saud's protecting this site.
The U.S. private security personnel must be there in the thousands.
Also have little doubt the off shore port must have an armada protecting it, just as with the off shore Iraqi port( guarded by British Navy,Australian Navy and the U.S Navy.)
I personally see only one way Al-Queda can succeed, and that is penetrate the security forces themselves, they need insiders, iow .