• Cal Dive International (CDI)
  " a leading provider of innovative subsea construction, maintenance and abandonment services to the oil and gas industry"
• Calsep
  "PVT-behavior at the tip of your fingers"
• Caltex
  part of the ChevronTexaco global energy company
• Camac Holdings Inc.
• Cambridge Applied Systems, Inc.
  "Leaders in viscosity management"
• Cambridge Energy Research Associates
  "the preeminent strategic knowledge advisor to the world's energy industry and to financial institutions and governments. "
• Cameron
  "a leading international manufacturer of oil and gas pressure control equipment, including valves, wellheads, controls, chokes, blowout preventers and assembled systems for oil and gas drilling, production and transmission used in onshore, offshore and subsea applications, and provides oil and gas separation, metering and flow measurement equipment."
• Canada Tech
  "developed a wide line of tools and systems that measure pressures and temperatures in the downhole and surface environment of oil and gas wells."
• Canadian Natural Resources Limited
  "a senior oil and natural gas exploration, development and production company based in Calgary, Alberta. "
• Canadian Oil Sands Trust
  
• Canadian Seabed Research Ltd.
  "is a company of professional geologists, geophysicists, and survey engineers who specialize in engineering and environmental services."
• Canam Pipe & Supply
  "founded to supply the International Oil Industry with Oilfield Equipment....quality oilfield equipment to remote locations around the world in a time effective manner"
• CanBaikal
  "a Canadian Oil & Gas company with 100% of its properties located in the Western Siberian Sedimentary Basin of Russia. "
• Carbonate Research Consulting, Inc.
  "Providing extensive domestic and international geologic and engineering consulting and training services for all types of exploration, reservoir characterization or exploitation needs "
• Cardinal Surveys
• Carnarvon
  "a junior oil and gas exploration company with an exploration focus concentrated in the Carnarvon and Perth Basins in Western Australia."
• Carrizo Oil & Gas, Inc.
  "Homepage for the Canadian Oilpatch"
• Carson Services Inc./Aerogravity Division
  "Complete Turnkey Survey Data Processing and Interpretation"
• Cascade Drilling, Inc.
  "specializes in geotechnical and environmental drilling services"
• Castle Energy Associates
  "a UK project consultancy specializing in the oil, gas and power industries on a worldwide basis."
• Cawley, Gillespie & Associates, Inc.
  "petroleum consultants"
• CBG Corporation
  " has proven successful as an outsource supplier for the development of specialized wireline tools...also produced a diverse range of standard products for Production Logging, Open-Hole Logging, Directional Drilling, and MWD, and has patented two products. "
• CCI Inspection Services, Inc.
  "Our mission is to provide industrial inspection to world wide construction and maintenance projects. "
• CCS Energy Services
  "a leading western Canadian oilfield service company with a network of treatment recovery and disposal (TRD), cavern and engineered landfill facilities.... provides emulsion treatment, crude oil terminaling, waste processing, deep well disposal, tank washing and cavern and landfill disposal of oilfield wastes."
• CEC Energy Consultants
  " an engineering project management firm that allows you to outsource operations, engineering, and business development projects while maintaining project control."
• Centrilift
  "provides a broad variety of pumping systems and related components to its globally based customers. "
• Century Geophysical Corp.
  "provides high quality borehole geophysical logging systems and analysis software for sale or rent throughout the world."
• Challenger International, Inc.
  "over 100 years combined experience and expertise in Manufacturing, Inspections, Services and Sales of New and Used Oil Country Tubulars."
• Champion Technologies
  "is the largest privately owned oilfield chemical company. Champion is a global supplier of a complete line of proprietary specialty chemicals offering technical solutions to problems in the oil and gas industry"
• Chandler Engineering
  "Measurement Instruments for the Energy Industry. Both Laboratory and Field Instrumentation."
• Chapman Petroleum Engineering Ltd.
  "comprehensive professional results emphasizing results, presentation, efficiency and integrity"
• Chemex LLC
  "The SOURCE for used process equipment since 1978."
• Chemical Tracers, Inc.
  "provides in-situ fluid saturation measurement specialized services for non-destructive reservoir characterization and enhanced oil recovery performance evaluation. Each field test method provides quick, reliable results representative of several hundred barrels of reservoir pore space."
• Cherrington Corporation
  " principal business is contracting, construction design and manufacturing for the Horizontal Directional Drilling (HDD) industry in an innovative manner that results in long-term profitability."
• Chesapeake Energy Corporation
  "one of the 15 largest independent oil and gas producers in the U.S. with proved reserves of almost 1.3 trillion cubic feet of natural gas equivalent."
• Chevron
  "Developing vital energy resources around the globe "
• Chevron Phillips
• China National Offshore Oil Corporation
  
• China Petroleum Material & Equipment Corporation
• CiDRA Corporation
  "develops innovative instrumentation solutions for measurement, monitoring and control applications in a broad range of end-markets, from photonic scientific and laboratory instruments to industrial process fluid control systems. "
• Circumpacific Energy Corporation
  " a Canadian junior oil and gas exploration company "
• Clayton Williams Energy
  "an independent energy company"
• Cleansorb Limited
  "our unique, effective and environmentally friendly Arcasolve™ acidizing process for maximising the production rate and asset value of oil and gas wells."
• CMS Energy
• Codeco Engineering Ltd. and Codeco Consulting Inc.
  "offer a complete range of engineering services and project management to all facets of the oil and gas industry."
• Cole Parmer Instrument Company
  "a leading manufacturer and distributor of fluid handling equipment and supplies, tubing, pump systems, testing meters, safety products, glassware, process automation and laboratory equipment. Applications Specialists assist in finding the right instrumentation for the job. Additional services include NIST-traceable calibration and instrument repair."
• Collarini Engineering
  "expert reservoir and production engineers, geologists, and geophysicists who apply our talents in a number of different ways. "
• Compagnie Generale de Geophysique (CGG)
  "the only company to operate with all geophysical methods for hydrocarbon and mineral exploration, environment and civil engineering. "
• Complete Package Technology, Ltd.(COMPACT)
  " manufactures a complete range of products for the Oil, Gas, Petro-Chemical and Forestry industries."
• Compressco Field Services, Inc.
  "As the manufacturers of the GasJack® compressor, provides sales, leasing, service and support to the Petroleum and Natural Gas industries. "
• Compton Petroleum Corporation
  "a Calgary-based company actively engaged in the exploration, development and production of natural gas, natural gas liquids and crude oil in Western Canada."
• Computer Modelling Group Ltd.(CMG)
  "Leaders in oil and gas reservoir modelling, simulation and engineering; with training and education on simulators, technical support, and professional consulting services for optimizing petroleum production"
• Connection Technology, Ltd.,
  "manufactures microprocessor-based systems that are used in the 'non-destructive' testing of Oil Country Tubular Goods."
• Conoco Phillips
  "an international, integrated energy company "
• Construction Unlimited, Inc.
  "a multi-facited [sic] specialty construction company, servicing the L.P., petroleum (gasoline, deisel and fuel oil) and chemical tank industries. We install, train operating personnel, test, modify and remove various bulk supply tanks for our clients."
• Contango Oil & Gas Company
  "a Houston-based, independent natural gas and oil company. The Company's core business is to explore, develop, produce and acquire natural gas and oil properties offshore in the Gulf of Mexico."
• Continental Energy Corporation
  "a development stage oil and gas exploration and production company focused on properties in Indonesia and Texas, USA. "
• Control Flow Inc.
  "manufacturer of quality valves, offshore oil field drilling equipment, wellhead, production pressure control equipment and motion compensation equipment, including pipe handling equipment with products and services second to none."
• Core Laboratories
  "your global service partner for 60 years"
• Coretest Systems, Inc.
  "Instruments for the Petroleum and Hydrothemal Industries"
• Corex
  "a specialist service company dealing with the analysis of geological samples on behalf of the International Oil and Gas industry. The main analytical services provided are Formation Damage, Core Analysis, Special Core Analysis, and Geological Services. "
• Corridor Resources Inc.
  "an active explorer of the Maritimes and Gulf of St. Lawrence region, specializing in both the Anticosti and Magdalen basins. "
• Corstor
  "core storage: now as simple as office filing"
• Cougar Tool, Inc.
  "proven its dependability in drilling activities throughout North America, Europe, Australia, the Middle East, South America, Asia and Africa. "
• Coutret and Associates, Inc.
  "professional petroleum reservoir services....including property evaluation, property management, improved recovery studies and project design, and reserves estimation."
• CRC-Evans Pipeline International
  "manufacture equipment and supply services to the pipeline industry "
• Credo Petroleum Corporation
  "explores for, purchases, develops, produces and sells crude oil and natural gas. "
• Croda Industrial Specialities
  
• Crosco Integrated Drilling & Well Services Company, Ltd.
• Crossover, Inc.
  "servicing the oil country tubular market"
• Crown Central Petroleum
• Crux Subsurface, Inc.
  "provides data for the engineering industry through difficult access geotechnical drilling."
• Cudd Well Control
  "Global Blowout Firefighting Well Control Specialists"
• Cummins Inc.
  "If you are drilling, producing or servicing, ... has the power, the power generation, the mobile power generation, the filtration, the fire protection power and the emissions solutions you need."
• Curlew Lake Resources, Inc.
  "an independent oil and gas exploration, development and production company with operations in the western sedimentary basins of Canada and the United States."
• Cutting Edge Core Drilling, Inc.
  "This company insures that every project we participate on will receive the full focus of three basic principles ethics, honesty, and hard work always exceeding the industry standard for real time geotechnical data collection."
• Cyrus Oil & Gas Company
  "has been created and designed to capitalize on the high growth potential of the new domestic gas and oil market. Cyrus has perfected several proprietary oil and gas exploration technologies that will be used to find and develop new domestic sources of energy. "

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