There's a fair amount of guesswork involved in this, but Stuart Staniford takes a look at Saudi oil production over the past decade, compares it to the number of active rigs in the Kingdom, and comes to a gloomy pair of conclusions:
The official line from the Saudis has always been far more optimistic: they say they can produce 10-11 mbd right now and are building capacity to increase that significantly within a few years. And maybe they can. But the actual facts on the ground have never been very friendly toward this claim. I'd say they still aren't.