Nabors Industries is a global oil and gas drilling company based in Houston, Texas.Nabors owns the largest land drilling fleet in the world with approximately 400 rigs in more than 20 countries. Company consists of the following business segments: U.S. Drilling, Canada Drilling, International Drilling, Drilling Solutions, and Rig Technologies. Transocean, one of the top 10 offshore drilling companies in the world has existed in over 20 countries such as Switzerland, the US, Canada, India, Indonesia, Brazil, and Singapore. Transocean is considered one of the largest offshore drilling company and owns over 60 oil drilling rigs and is headquartered at Vernier, Switzerland. ConocoPhillips says that the largest mobile land rig in North America is on its way from a National Oilwell Varco fabrication shop in Nisku to Alaska’s North Slope, where it will unlock previously unreachable oil resources. The extended reach drilling system, called Doyon 26, is estimated to be 1.5 to 2 times as powerful as existing rigs; a