The company was founded in 1997 and is based in Fort Worth, Texas.Cano Petroleum, Inc., together with its subsidiaries, operates as an independent oil and natural gas company in the United States. Cano Petroleum, Inc. properties are located onshore U.S. in Texas, New Mexico, and Oklahoma. As of June 30, 2009, it had 49.1 million barrels of oil equivalent (MMBOE) of proved reserves comprising 7.7 MMBOE of proved developed producing reserves, 2.4 MMBOE of proved developed non-producing reserves, and 39.0 MMBOE of proved undeveloped reserves. Cano secured its first round of institutional funding with a $5.1 financing from Wellington Management. In May, 2005, Cano was accepted for listing on the American Stock Exchange and in July a number of the company’s officers, directors, management and others were on hand for the ceremonial bell–ringing.

Cenovus Energy reserves the right to recover and refine oil in the US and Canada. With major operations in Alberta and Saskatchewan, Cenovus Energy Inc. has proved reserves of some 909 million barrels of oil equivalent and about 1.9 trillion cu. ft. of natural gas. Cenovus Energy Inc. also maintains ownership interest in two refineries in Illinois and Texas that are part of a 50/50 joint venture with ConocoPhillips. That venture provides integration of Cenovus' upstream oil production with downstream refining of such consumer products as diesel, gasoline, and jet fuel. Together, the refineries have a processing capacity of about 500,000 barrels of oil per day. Cenovus Energy was formed in late 2009 as a spinoff of EnCana.

Century Energy Ltd. is a junior oil and gas exploration company actively pursuing exploration opportunities in Canada and South America. Century Energy Ltd. owns the petroleum and natural gas rights to 1,100 acres in the Bakken oil formation in Southern Saskatchewan. In conjunction with TriAxon Resources Ltd. (its joint venture partner with extensive experience in the Backken Shale play) Century Energy Ltd. has succeeded in producing oil from its first exploratory Bakken well and plans to develop several others.

Cequence Energy Ltd. is a junior oil and natural gas exploration and development company which was formed as part of the re-capitalization of Sabretooth Energy Ltd. in July 2009. Combining Cequence’s solid balance sheet and strong technical expertise in the Peace River Arch and Deep Basin areas of Alberta, Cequence Energy Ltd. is uniquely positioned to grow through both acquisitions and the drill bit. Cequence’s disciplined approach to controlling costs and making strategic acquisitions will provide the resources for production, reserve and cash flow growth per share with significant upside potential. Focusing on the Peace River Arch oil and gas patch in Alberta and British Columbia, the company greatly expanded its operations in 2007 through the acquisition of Bear Ridge Resources, which explored for and produced oil and gas in Central Alberta and Southeast Saskatchewan. Cequence Energy produces about 3,380 barrels of oil per day from its operations in western Canada. Cequence Energy Ltd. has proved and possible reserves of about 8.3 million barrels of oil equivalent. In 2009 Cequence Energy Ltd. recapitalized, brought in a new management team and changed its corporate name.

Chaparral Energy is an independent oil and gas producer and operator with headquarters in Oklahoma City, Oklahoma and field offices throughout the South Central United States. Chaparral has experienced steady growth since beginning its operations in 1988. Although predominately a Mid Continent and Permian Basin producer, Chaparral has operations extending from off-shore gulf coast in south Texas, east to Mississippi, west to Utah and north to North Dakota. In the beginning, Chaparral Energy, Inc. primarily targeted acquisition opportunities operated in environments that had been abandoned by other producers. Chaparral Energy, Inc. has become known for its expertise and specialization in well rejuvenation. Chaparral has transitioned from mostly an acquisition company into an active drilling company, and in 2004 began acquiring license rights to existing 3D seismic to evaluate additional drilling opportunities. Chaparral is also known for its expertise in enhanced oil recovery and has a large inventory of carbon dioxide (CO2) tertiary recovery projects in the Mid-Continent and Permian Basin.

Cheniere Energy, Inc. was founded in 1983 and is based in Houston, Texas. Cheniere Energy, Inc., through its subsidiaries, engages in the development, construction, ownership, and operation of onshore liquefied natural gas (LNG) receiving terminals and natural gas pipelines along the Gulf Coast of the United States. Cheniere Energy, Inc. develops LNG receiving terminal projects on Sabine Pass LNG in western Cameron Parish, Louisiana on the Sabine Pass Channel; Corpus Christi LNG near Corpus Christi, Texas; Creole Trail LNG at the mouth of the Calcasieu Channel in central Cameron Parish, Louisiana; and Freeport LNG on Quintana Island near Freeport, Texas. Cheniere Energy, Inc. also engages in oil and natural gas exploration and development activities in the Gulf of Mexico.

Chevron is one of the world's largest integrated energy companies. Headquartered in San Ramon, California, Chevron U.K. Ltd conduct business in countries all around the globe. Chevron U.K. Ltd are engaged in every aspect of the crude oil and natural gas industry, including exploration and production, manufacturing, marketing and transportation, chemicals manufacturing and sales, geothermal, and power generation. Chevron U.K. Ltd also investing in renewables and advanced technologies. In 2008 two Britannia satellite fields (Callanish and Brodgar) began production. Chevron U.K. is also developing the North Sea-based Clair Field, in which it holds a 19% interest.

China National Offshore Oil Corporation (CNOOC) is the largest offshore oil and gas producer in China. Besides production, which is handled through subsidiary CNOOC Limited, CNOOC has more than two dozen other subsidiaries involved in oil and gas refining and marketing, chemicals (China BlueChemical), technical and engineering services (such as China Oilfield Services), and financial services (such as a life insurance joint venture with AEGON). About half of the government-owned company's revenue comes from oil production; in 2008, China National Offshore Oil Corporation produced 194 million barrels of oil equivalent, while its refineries processed 3.35 million tons of crude. CNOOC's marketing arm owns almost 200 gas stations and eight oil depots.

CNPC is China's largest oil and gas producer and supplier, as well as one of the world's major oilfield service providers and a globally reputed contractor in engineering construction. With a presence in almost 70 countries, China National Petroleum Corporation are seeking an even greater international role. China National Petroleum Corporation provide energy in a profitable manner, and always attach great importance to our social and environmental responsibilities. CNPC has exploration and production projects in China and 26 other countries, including operations in Azerbaijan, Canada, Indonesia, Iraq, Myanmar, Oman, Peru, Sudan, Syria, Thailand, Turkmenistan, and Venezuela. The company also operates some older refineries and an extensive oil and gas pipeline network in China. CNPC also operates a network of 1,650 gas stations. In 2007 CNPC reported estimated reserves of 3.1 billion metric tons of oil and 2.3 trillion cu. meters of natural gas.

China North East Petroleum Holdings is engaged in the extraction and production of crude oil in a region of Northern China. China North East Petroleum Holdings Limited current operations are focused on four oilfields located in China's Jilin province, where it operates about 250 producing wells. China North East Petroleum Holdings Limited operates in tandem with oil giant PetroChina to exploit a number of 20-year leases held by PetroChina. China North East Petroleum Holdings has proved reserves of approximately 5.5 million barrels of crude oil equivalent. Large-scale commercial drilling at the Jilin Quinan Oil Field started in 1986.

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