ENSCO is the largest offshore Jack-Up Oil and Gas well drilling contractor, with 50 offshore Jack-Up and 3 Semi-submersible drilling rig's servicing domestic US, international, and Scientific drilling markets. Primary drilling locations range from 50 to 500-miles offshore, in the North Sea, Africa, Middle East, Asia Pacific, South America, and the Gulf of Mexico. High tech and immensely strong Jack-Up Rigs are positioned in ocean depths of up to 400-feet, with each of 3 legs being driven into the ocean floor for stability, by pumping ocean water into onboard tanks, weighing up to 6-million pounds, to drive each reinforced Rig leg up to 100-feet into the sediment and rock. Semi-submersibles have no connection to the ocean floor, and maintain their location by Dynamic positioning via GPS and computer-controlled 4,000 horsepower Rolls-Royce Azimuth thruster or Flowserve propulsion units, in up to 10,000 feet of ocean, and drill down to 38,000 feet into the earth's crust for oil and natural gas deposits. With 3,800 employees, and annual revenue in the $1.6 billion range, the Company is ranked in the Top 10 Energy industry companies in Dallas, Texas and is publicly traded on the New York Stock Exchange under the symbol ESV. Offshore may refer to oil and natural gas production at sea, see oil platform. ... Well drilling is the process of drilling a hole in the ground either for exploration of the nature of the material underground or for the extraction of a natural resource such as water, natural gas, or petroleum. ... A semi-submersible or semisubmersible is a watercraft that can put much of its bulk underwater. ... Natural gas drilling rig A drilling rig is a structure housing equipment used to drill for water, oil, natural gas from underground reservoirs or to obtain mineral core samples. ... Scientific drilling is a way to probe down into the Earth, allowing scientists and students to obtain samples of sediments, crust, and upper mantle. ... The North Sea is a sea of the Atlantic Ocean, located between the coasts of Norway and Denmark in the east, the coast of the British Isles in the west, and the German, Dutch, Belgian and French coasts in the south. ... For other uses, see Africa (disambiguation). ... A map showing countries commonly considered to be part of the Middle East The Middle East is a region comprising the lands around the southern and eastern parts of the Mediterranean Sea, a territory that extends from the eastern Mediterranean Sea to the Persian Gulf. ... Map of the Pacific Rim and List of the Pacific Rim Nations The Pacific Rim is a political and economic term used to designate the countries on the edges of the Pacific Ocean, as well as the various island nations within the region. ... South America South America is a continent crossed by the equator, with most of its area in the Southern Hemisphere. ... Gulf of Mexico in 3D perspective. ... High tech refers to high technology, technology that is at the cutting-edge and the most advanced currently available. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... Rolls-Royce plc is the second-largest aircraft engine maker in the world, behind General Electric Aviation. ... Siemens Schottel azimuth thrusters Azimuth thrusters are a method of propulsion for ships. ... The Flowserve Corporation (NYSE: FLS) is a world supplier of pumps, valves, seals, automation, and services to the power, oil, gas, chemical and other industries. ... Look up Crust in Wiktionary, the free dictionary. ... Natural olive oil Synthetic motor oil Oil, in a general sense, is a chemical compound that is not miscible with water, and is in a liquid state at ambient temperatures. ... Many stoves use natural gas. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... The energy industry is a generic term for all of the industries involved the production and sale of energy, including fuel extraction, manufacturing fuel and refining, and fuel distribution. ... Dallas redirects here. ... Official language(s) See: Languages of Texas Capital Austin Largest city Houston Area  Ranked 2nd  - Total 268,581 sq mi (695,622 km²)  - Width 773 miles (1,244 km)  - Length 790 miles (1,270 km)  - % water 2. ... New York Stock Exchange (June 2003) The New York Stock Exchange (NYSE) , also nicknamed the Big Board, is the largest stock exchange in the world in dollar volume and second largest by number of companies listed. ...