Years ago I was a roughneck for a couple of summers in college, and we just had four guys “running” the rig. The driller, mud man/tower guy, and two roughnecks. And that was to about 16,000 feet.
With another crew sleeping while we worked and vice-versa. And a geologist once we were near the production zone. A cook and helper, a welder at some times, the company man some times, and a few others. Not to mention the deliveries of pipe, fuel, parts, etc. But, looking back, it was pretty amazing to have such an operation running, with not that many people really, stuck way out in the desert. (The food on the one rig was the best I ever had!)
So I guess it might depend on the definition of “running” it.
http://www.wassoc.com/ocean-engineering/drills
An aside: here is a firm that makes drilling rigs that require NO people. (Well, no people on the rig as it is underwater!) Lord knows how many people are on the ship above keeping everything working.
But pretty cool stuff - the can hoist it over the side, lower it down and “fly” it a certain amount to a good landing site. Then core to 100 meters using robotic “roughnecks” to add pipe, etc. The shallow rigs they use to check for cable routes, and the Japanese are using the deeper (newer) ones for methane hydrate exploration.