Chennai Petroleum Corporation Limited (CPCL), formerly known as Madras Refineries Limited (MRL) was formed as a joint venture in 1965 between the Government of India (GOI), AMOCO and National Iranian Oil Company (NIOC) having a share holding in the ratio 74%: 13%: 13% respectively. Originally ,CPCL Refinery was set up with an installed capacity of 2.5 Million Tonnes Per Annum (MMTPA) in a record time of 27 months at a cost of Rs. 43 crore without any time or cost over run. In 1985, AMOCO disinvested in favour of GOI and the shareholding percentage of GOI and NIOC stood revised at 84.62% and 15.38% respectively. Later GOI disinvested 16.92% of the paid up capital in favor of Unit Trust of India, Mutual Funds, Insurance Companies and Banks on 19 th May 1992, thereby reducing its holding to 67.7 %. The public issue of CPCL shares at a premium of Rs. 70 (Rs. 90 to FIIs) in 1994 was over subscribed to an extent of 38 times and added a large shareholder base.

Occidental Petroleum Corporation was founded in 1920 and is based in Los Angels, California.Occidental Petroleum Corporation, together with its subsidiaries, operates as an oil and gas exploration and production company. Occidental Petroleum Corporation has three segments: Oil and Gas; Chemical; and Midstream, Marketing, and Other. The Oil and Gas segment engages in the exploration, development, production, and marketing of crude oil, natural gas liquids, and condensate and natural gas in Texas, New Mexico, California, Kansas, Oklahoma, Utah, and Colorado, as well as in Argentina, Bolivia, Colombia, Libya, Oman, Qatar, the unite Arab Emirates, and Yemen. As of December 31, 2008, Occidental Petroleum Corporation had proved reserves of approximately 2,978 million barrels of oil equivalent. The Chemical segment manufactures and markets basic chemicals, vinyls, and performance chemicals. The Midstream, Marketing, and Other Segment gathers, treats, processes, transports, stores, trades, and markets crude oil, natural gas, natural gas liquids, and condensate and carbon dioxide, as well as generates and markets power. In addition, Occidental Petroleum Corporation involves in the calcium chloride business.

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.

Constellation Energy Partners LLC was founded in 2005 and is headquartered in Houston, Texas. Constellation Energy Partners LLC engages in the acquisition, development, and production of oil and natural gas properties, as well as related midstream assets in the United States. Constellation Energy Partners LLC has interests in the Black Warrior Basin in Alabama, the Cherokee Basin in Kansas and Oklahoma, and in the Woodford Shale in the Arkoma Basin in Oklahoma. As of December 31, 2008, Constellation Energy Partners LLC had approximately 232.4 Bcfe of estimated proved reserves; and owned approximately 2,763 net producing wells. Constellation Energy Partners LLC was formerly known as Constellation Energy Resources LLC and changed its name to Constellation Energy Partners LLC in July 2006.

Tuscany Energy Ltd. that was founded in 1990s and has gone through numerous changes, its latest one in 2009 with the amalgamation with Goldmark Minerals Ltd. Tuscany Energy Ltd. the oil and gas exploration company. Tuscany Energy Ltd. is focused on acquiring production-based properties for exploration and development operations within the Western Canadian Basin. Tuscany Energy Ltd. two core properties are in the Evesham and Macklin areas situated in west-central Saskatchewan, which produce 162 billion barrels per day of oil and 468 million cubic feet per day of natural gas. Most of Tuscany's revenue comes from its gas production. Tuscany Energy Ltd. bought Goldmark Minerals in 2009, hoping the gold exploration and development company could help it finance its energy operations.

Anderson Energy Ltd. is a publicly traded oil and gas company engaged in the exploration, acquisition, development and production of oil and natural gas in Western Canada. Anderson Energy Ltd.’s principle property is in Central Alberta. The company's development strategy is focused on shallow gas. Anderson Energy Ltd. was established as a private company on January 30, 2002. Anderson owns an interest in 477 gross (218 net) natural gas wells and 22 gross (14 net) oil wells in the central Alberta region. In 2007 the company owned a total proved reserves of 123 billion cu. ft. of natural gas. Most of Anderson Energy's production is natural gas that comes from various Edmonton Sands pools.

Fort Chicago Energy Partners is a little north of where you might expect to find it. The Canadian company operates natural gas and ethane pipelines in Canada and from Canada to the US. Fort Chicago owns about half of the 3,000-km Alliance Pipeline, a mainline natural gas pipeline linking British Columbia to the Chicago area. It also holds part of the Aux Sable Plant, a natural gas liquids (NGLs) extraction, fractionation, and delivery complex near the Alliance terminus in Chicago. The company owns all of Alberta Ethane Gathering System, a pipeline that extracts and transports ethane. Fort Chicago, Enbridge Inc., and Enbridge Income Fund jointly control Alliance Pipeline and Aux Sable.

Rosetta Resources Inc., an independent oil and gas company, engages in the acquisition, exploration, development, and production of oil and gas properties in North America. Rosetta Resources Inc. primarily operates in the Sacramento Basin of California; the Rockies; the Lobo and Perdido Trends in South Texas; the State Waters of Texas; and the Gulf of Mexico. As of December 31, 2008, Rosetta Resources Inc. had 398.2 billion cubic feet equivalent of proved oil and natural gas reserves, including 376.5 billion cubic feet of natural gas and 3,603 thousand barrels of oil and condensate; and drilled 184 gross wells. Rosetta Resources Inc. is headquartered in Houston, Texas.

Petrobras America is engaged in oil exploration and production in the Gulf of Mexico. Petrobras America Inc. also refines and markets oil and oil products and procures materials and equipment for its parent, PETROLEO BRASILEIRO (PETROBRAS). Petrobras America Inc. owns 50% of the Pasadena Refinery in Texas and has stakes in the Cascade, Chinook, and Cottonwood oil and gas fields in the Gulf of Mexico. Petrobras America is also engaged in the purchase and sale of petroleum products, including crude oil, fuel oil, gasoline, special products, naphtha, and liquid petroleum gas. Petrobras America Inc. procures oil services equipment and related supplies, primarily to support its operations in the Gulf of Mexico. Petrobras America Inc. Petrobras, a large integrated oil company is producing over 2. 2 million bbl/day worldwide and will be investing US$ 85 Billion over the next 5 years to increase this production to 3.5 million bbl/day. (PAI) was incorporated in 1987 in the United States. PAI corporate office is located in Houston, Texas.

GCA is an international advisory firm focused on the provision of integrated technical and managerial services and independent advice to all sectors of the oil and gas industry. Gaffney, Cline & Associates provides technical, operational, management, and commercial consulting services to the global oil and gas industry. Gaffney, Cline & Associates Ltd. portfolio includes reservoir appraisal, advice about field development, and refining and marketing, as well as integrated technical and management services. Gaffney, Cline & Associates Ltd. also provides independent certifications of oil and gas reserves and expert witness services or arbitration services for projects that involve legal, technical, or contractual disputes. Gaffney, Cline & Associates Ltd. has offices throughout the world, and clients include global oil and gas companies, national oil companies, governments, and private investors. Executives Peter Gaffney and Ben Cline founded the firm in 1962.

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