What are the top oil drilling companies for the USA?

i've researched this, but i can't seem to find a whole lot. if anyone could let me know which companies for oil drilling are the biggest in the USA


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thanks!What are the top oil drilling companies for the USA?
If you mean drilling companies, Patterson-UTI out of Snyder Texes is one of the largest.





Bronco drilling in Oklahoma City.





PIoneer drilling out of San Antonio





Helmerich %26amp; Payne out of Tulsa





And numerous small private drilling companiesWhat are the top oil drilling companies for the USA?
Have you tried looking through Obamas campaign contributer list?








O.K. All kidding aside, Here are the top 5 U.S. based oil companies.





ExxonMobil


Chevron


ConocoPhillips


Valero


Marathon Oil