Patterson-UTI operates land based drilling rigs, primarily in O&G producing regions of the continental US, and western Canada. The company also provides pressure pumping services to US E&P companies and specialist technology, notably pipe handling components, to drilling contractors globally. Oil and gas drilling is a dirty business. Oil and gas drilling has serious consequences for our wildlands and communities. Drilling projects operate around the clock, disrupting wildlife, water sources, human health, recreation and other aspects of public lands that were set aside and held in trust for the American people. The United States maintains a Strategic Petroleum Reserve at four sites on the Gulf of Mexico, with a total capacity of 727 million barrels (115.6×10^ 6 m 3 ) of crude oil. The maximum total withdrawal capability from the United States Strategic Petroleum Reserve is 4.4 million barrels (700,000 m 3 ) per day.