How come all the oil money seems to be in Saudi Arabia?

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American oil production is not nationalized.

This means the US is producing more but has less reserves 

Are all those barrels being sold or being depleted?

Gpt: Saudi Arabia vs. the U.S.

Extracted to Date:
  Saudi Arabia: ~150 billion barrels  
  U.S.: ~200 billion barrels  

Proven Reserves:  
  Saudi Arabia: ~267 billion barrels  
  U.S.: ~36-47 billion barrels  

Production Rate:  
  Saudi Arabia: ~10 million barrels/day  
  U.S.: ~12-13 million barrels/day