Abraxas Petroleum Corporation company was founded in 1977 and is based in San Antonio, Texas. Abraxas Petroleum Corporation (Abraxas) is an independent energy company primarily engaged in the development and production of natural gas and crude oil. At December 31, 2008, the Company’s properties are located in the Rocky Mountain, Mid-Continent, Permian Basin and Gulf Coast regions of the United States. On January 31, 2008, Abraxas Operating , LLC, a wholly owned subsidiary of the Partnership, consummated the acquisition of certain oil and gas properties located in various states from St. Mary Land & Exploration Company (St. Mary) and certain other sellers. In October 2009, Abraxas Petroleum Corporation closed the merger with Abraxas Energy Partners, L.P.

LUKOIL is one of the world’s leading vertically integrated oil & gas companies. Main activities of the Company are exploration and production of oil & gas, production of petroleum products and petrochemicals, and marketing of these outputs. Most of the Company's exploration and production activity is located in Russia, and its main resource base is in Western Siberia. LUKOIL owns modern refineries, gas processing and petrochemical plants located in Russia, Eastern and Western Europe, near-abroad countries. Most of the Company's production is sold on the international market. LUKOIL petroleum products are sold in Russia, Eastern and Western Europe, near-abroad countries and the USA. LUKOIL is the second largest private oil Company worldwide by proven hydrocarbon reserves. The Company has around 1.1% of global oil reserves and 2.3% of global oil production. LUKOIL dominates the Russian energy sector, with 18% of total Russian oil production and 19% of total Russian oil refining.

Canadian Natural Resources Limited was founded in 1973 and is headquartered in Calgary, Canada.Canadian Natural Resources Limited engages in the exploration, development, and production of crude oil and natural gas. Canadian Natural Resources Limited also engages in the midstream activities, which include its pipeline operations and an electricity co-generation system. Canadian Natural Resources Limited conventional crude oil and natural gas operations are focused primarily in western Canada, the United Kingdom portion of the North Sea, and offshore West Africa. Canadian Natural Resources Limited holds interests in the Horizon Oil Sands project located in the north of Fort McMurray for producing synthetic crude oil through bitumen mining and upgrading operations.

Superior Energy Services, Inc. provides specialized oilfield services and equipment to serve the production and drilling related needs of oil and gas companies. Superior Energy Services Inc. operates through three segments: Subsea and Well Enhancement, Drilling Products and Services, and Marine. The Subsea and Well Enhancement provides various services, including coiled tubing, electric line, pumping and stimulation, gas lift, well control, snubbing, recompletion, engineering and well evaluation, offshore oil and gas tank and vessel cleaning, decommissioning, plug and abandonment, and mechanical wireline services. Superior Energy Services Inc. provides mechanical wireline services in the Gulf of Mexico. This segment also manufactures and sells drilling rig instrumentation equipment. The Drilling Products and Services segment manufactures, sells, and rents equipment for use with offshore and onshore oil and gas well drilling, completion, production, and workover activities in Latin America, North America, the North Sea region, Continental Europe, the Middle East, Central Asia, West Africa, and the Asia Pacific region. Superior Energy Services Inc. drilling products and services comprise pressure control equipment, drill pipe and landing strings, connecting iron, handling tools, stabilizers, drill collars, torquing tools, and on-site accommodations. The Marine segment owns and operates a fleet of liftboats in the Gulf of Mexico and the Caribbean. As of December 31, 2009, Superior Energy Services Inc. operated a fleet of 26 rental liftboats. Superior Energy Services Inc. was founded in 1991 and is based in New Orleans, Louisiana.

Chesapeake Energy Corporation was founded in 1989 and is based in Oklahoma City, Oklahoma.Chesapeake Energy Corporation, an oil and natural gas exploration and production company, engages in the acquisition, exploration, and development of properties for the production of crude oil and natural gas from underground reservoirs. It also provides marketing and midstream services for natural gas and oil for other working interest owners in properties it operate. Chesapeake Energy Corporation properties are located in Oklahoma, Texas, Alabama, Arkansas, Louisiana, Kansas, Montana, Colorado, North Dakota, Nebraska, New Mexico, West Virginia, Kentucky, Ohio, New York, Maryland, Michigan, Mississippi, Pennsylvania, Tennessee, Utah, Virginia, and Wyoming. As of December 31, 2008, it owned interests in approximately 41,200 producing natural gas and oil wells; and had 12.051 trillion cubic feet equivalent of proved reserves.

Twin Butte is an oil and gas exploration, development, and production company that has assets on more than 150,000 net acres in the Western Canadian Sedimentary Basin. Its half-a-dozen properties, located in Alberta and British Columbia, have proved net reserves of 23,212 MMcf (million cubic feet) of natural gas and 1,528 Mbbl (thousand barrels) of light and medium oil (in fiscal year 2008); it produces more than 2,700 barrels of oil equivalent per day. Twin Butte traces its roots back to 1997. Twin Butte Energy Ltd. intends to focus future growth in the Deep Basin areas of Ansell and Jayar, and the conventional heavy oil area of Frog Lake. Both of these areas provide repeatable plays on our current lands with lower risk wells at Frog Lake and strong, long life growth potential in the Deep Basin.

NuStar Energy L.P.’s history has been filled with dramatic growth and success, rising from humble beginnings in 2001 to become the rising star of the energy industry today. The partnership made its successful initial public offering (IPO) on April 16, 2001, with one of the best one-day performances of any master limited partnership IPO ever. On its first day, the partnership, then known as Shamrock Logistics L.P. and part of the former Ultramar Diamond Shamrock Corp., sold 5.175 million partnership units at $24.50, nearly twice the expected price range for this IPO. The partnership was soon renamed Valero L.P. after Valero Energy Corp. acquired UDS later in 2001. And since that time, the partnership has had outstanding results and demonstrated how a limited partnership can have unlimited potential.

Continental Resources, Inc. was founded in 1967 and is based in Enid, Oklahoma.Continental Resources, Inc. engages in the exploration, exploitation, and production of oil and natural gas properties primarily in the Rocky Mountain, Mid-Continent, and Gulf Coast regions of the United States. Continental Resources, Inc. primarily sells its oil and natural gas production to end users, as well as to midstream marketing companies or oil refining companies at the lease. As of December 31, 2008, Continental Resources, Inc. estimated proved reserves were 159.3 million barrels of oil equivalent (MMBoe), with estimated proved developed reserves of 106.0 MMBoe. Continental Resources owned 1,114,445 net undeveloped and 399,825 net developed acres, as well as had interests in 2,192 wells and operated 1,657 of these wells.

Newpark Resources, Inc. and its subsidiaries provide fluids management, waste disposal, and well site preparation products and services primarily to the oil and gas exploration and production industry. Newpark Resources, Inc. operates in three segments: Fluids Systems and Engineering, Mats and Integrated Services, and Environmental Services. The Fluids Systems and Engineering segment offers drilling fluids products and technical services to drilling projects involving subsurface conditions, such as horizontal, directional, geologically deep, or deep water drilling. This segment also provides completion fluids and equipment rental services. The Mats and Integrated Services segment offers mat rentals, location construction, and related well site services to exploration and production customers in the onshore U.S. Gulf Coast, western Colorado, and northeast U.S. regions; and mat rentals to the utility industry in the United Kingdom. It also installs access roads and temporary work sites for pipeline, electrical utility, and highway construction projects. Newpark Resources, Inc. provides its products and services primarily in the United States Gulf Coast, west Texas, east Texas, Oklahoma, North Louisiana, Rocky Mountains, and northeast region of the United States, as well as Canada, Brazil, the United Kingdom, Mexico, and North Africa. Newpark Resources, Inc. was founded in 1932 and is headquartered in The Woodlands, Texas.

Oil & Gas Development Company Limited (or OGDCL) is Pakistan's largest oil and gas exploration and production company. OGDCL's products include gas, crude oil, and LPG. Oil and Gas Development Company exploration activities are performed both on its own and through joint ventures, some of which the company operates; OGDCL explores both within and outside of Pakistan, as well as offshore. Oil and Gas Development Company accounts for 45% of Pakistan's oil reserves and 35% of the country's natural gas reserves. Total proved reserves in 2009 stood at 625 million barrels of oil equivalent. OGDCL was founded by Pakistan's government in 1961. In 2009 the government owned 85% of the company.

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