Which would cause the bombs to go off anyhow because they will all have pressure switches on them. Not to mention that the explosion from the bombs themselves will probably catch the well heads on fire. You don't have explosions without heat.
Not likely, the EMP spike would be much larger than the actual explosive blast. The EMP could disable communications without much other effect. Having said that, my real fear would be Oil well workers directly doing Saddams bidding, and blowing them up themselves, no need for a remote control.