Which Companies Employ People To Work On The Oil Rigs?

One of the companies that employs people to work on the oil rigs would be the Petroleum industry. Also the Geology or the Meteorology department would employ people to work on the oil rigs. There are a number of companies that are set up in Gulf that employ people on oil rigs since that part has reserves of petroleum and oil in abundance. There are other similar companies across the world that employ people on Oil rigs since every country has a reserve of the same. There is Eakring oil field in England that hires people who can work in this field.  There are various companies in Germany, Norway, India among other places that go about hiring people on oil rigs.