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The Philadelphia oil service index is made up of the stocks of the fifteen largest companies that service the oil and natural gas industry. The symbol is OSX. These companies help drill for oil and gas, and also service marine and land-based oil and natural gas wells.

Well-known companies in the Philadelphia oil service sector index include:

Halliburton (HAL) provides products and services to energy companies. It operates in two divisions, one that helps find and produce new energy, and one that mostly helps maintain production. One of Halliburton's growing businesses is hydraulic fracturing, which increases oil production in certain kinds of wells. Halliburton was founded in 1919, and is working on projects in about 70 countries.

Nabors Industries (NBR) is a worldwide land drilling contractor, which also provides support and maintenance in the U.S. and Canada. It manufactures, sells, and leases a variety of rigs and other essential equipment. Nabors Industries was founded in 1968, and is based in Bermuda.

Transocean Ltd. (RIG) In November 2009, RIG was the largest holding in the OIH. The company provides offshore contract drilling services worldwide. It owns many offshore drilling units, used in getting oil out of deep waters. Based in Switzerland, Transocean was founded in 1953.

National Oilwell Varco (NOV) operates in three segments: Rig Technology, which provides offshore and onshore drilling equipment; Petroleum Services and Supplies, which makes and sells consumable equipment drillers need, like pipes and pumps; and Distribution Services, which sells maintenance supplies and spare parts. NOV has been in business since 1862, and is based in Houston.

Schlumberger (SLB) operates both in the U.S. and internationally. Its two segments are Oilfield services and WesternGeco. Oilfield Services offers technology, management and consulting to oil and gas producers. WesternGeco provides mapping, surveying, and seismic services to exploration and development companies, to help find energy. Schlumberger was founded in 1927 and has headquarters in Houston, with additional offices in The Hague, and Paris.

Weatherford International (WFT) provides equipment and services for the production of oil and gas. It provides artificial lift systems, manufactures and sells equipment, and provides chemical technology and services. It was founded in 1972, and is based in Switzerland.

Tidewater (TDW) operates a fleet of offshore service vessels that provide support and services to

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