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494 companies

Cardinal Surveys Company

Location not listedUpdated Dec 2002

Cardinal Surveys Company provides specialized production logging and related services for the oil and gas industry, including injection profiling, radioactive tracers, and pressure testing to optimize well performance.

Cawley, Gillespie & Assoc., Pe

Location not listedUpdated Dec 2002

Cawley, Gillespie and Associates, Inc. is a petroleum consulting firm providing independent petroleum engineering services, reserve reporting, and economic evaluations for the oil and gas industry since 1961, with offices in Texas.

Chaparral Resources

Location not listedUpdated Dec 2002

Chaparral Resources is an independent oil and gas company focused on exploration and production in the United States.

Chemac Inc

Location not listedUpdated Dec 2002
Training

Chemac Inc. provides industrial high pressure pumps, valves, sealing equipment, and comprehensive repair and maintenance services for chemical, petrochemical, oil and gas process applications.

China National Petroleum Compa

Location not listedUpdated Dec 2002

China National Petroleum Corporation (CNPC) is a major Chinese state-owned oil and gas corporation involved in exploration, production, and distribution of petroleum products.

Columbian TecTank

Location not listedUpdated Dec 2002

Columbian TecTank, part of CST Industries, is a global leader in industrial storage solutions specializing in tanks, silos, and covers for various markets including water/wastewater, oil & gas, agriculture, and bioenergy.

Compagnie Generale de Geophysi

Location not listedUpdated Dec 2002

Viridien is an advanced technology, digital and Earth data company specializing in geophysical imaging, data science, and sensor expertise to support energy, natural resource, environmental, and infrastructure challenges.

CompressionOnline.com

Location not listedUpdated Dec 2002

CompressionOnline.com provides compression equipment and services, primarily serving the oil and gas industry.

Conoco (UK) Ltd

Warwick, United KingdomUpdated Jan 2000

ConocoPhillips United Kingdom operates integrated oil and gas assets including the Teesside Terminal, with a skilled workforce and proven production success.

ConocoPhillips

Houston, TX, United StatesUpdated Aug 2005

Conoco is an integrated, international energy company involved in the discovery, development, production and sale of crude oil, natural gas, gas liquids, and petroleum products.

Cook Inlet Tug & Barge Co. Inc.

Anchorage, AK, United StatesUpdated May 2026

Cook Inlet Tug & Barge is a marine transportation company specializing in harbor services and fuel distribution, operating in the Port of Anchorage, Cook Inlet, Seward, Southeast Alaska, Aleutian Islands, and Western Alaska. The company supports oil & gas, construction, government, and private industries across the Pacific and Arctic oceans as well as the Bering, Chukchi, and Beaufort Seas.

Cooper Energy Services

Houston, Texas, United StatesUpdated Jan 2002

Cooper Energy Services provides equipment repair and machining services for the energy industry, specializing in downstream operations and critical equipment support.

Corrosion and Condition Control

Dingwall,, United KingdomUpdated Jan 2005

Corrosion and Condition Control (C3) specializes in process engineering, mathematics, and software development to support asset performance management in the oil and gas, refrigeration, water, and manufacturing industries.

Corrotherm International Ltd

Southampton, Hampshire, United KingdomUpdated Dec 2002

Corrotherm International Ltd is a leading stockist and supplier of seamless pipes, tubes, fittings, and flanges made from nickel and nickel alloys, serving demanding industries such as oil & gas, petrochemical, and power generation.

Cromarty Firth Port Authority

Invergordon, Ross-shire, Scotland,UkUpdated Aug 2003

Port of Cromarty Firth is a strategic national open trust port in Scotland, supporting offshore wind, oil & gas, green hydrogen, and cruise industries with deep sheltered waters and extensive infrastructure.

Curtis Davis Garrard

Heathrow Airport,, Uxbridge, United KingdomUpdated May 2006

Curtis Davis Garrard is focused on the shipping and offshore oil and gas industries in the United Kingdom.

DIETSWELL ENGINEERING

Montigny le Bretonneux, FranceUpdated Apr 2003

Well engineering, Drilling Operations Management, Recruiting Services and Provision of Manpower Resources

Deepwater Corrosion Services Inc.

Houston,, TX, United StatesUpdated Oct 2007

Deepwater Corrosion Services Inc. is a full-service offshore corrosion control company specializing in asset integrity management for the oil and gas industry, offering cathodic protection design, anode manufacturing, inspection, and corrosion engineering services.

Deepwater Specialists, Inc. (DSI)

New Orleans,, LA, United StatesUpdated Oct 2007

Deepwater Specialists, Inc. (DSI) provides facilities commissioning and function testing services for automated systems in the oil and gas industry, primarily focused on deepwater projects.

Diamond Offshore Drilling, Inc (Houston)

Houston,, Texas, United StatesUpdated May 2026

Diamond Offshore Drilling, Inc is an offshore drilling company based in Houston, specializing in deepwater drilling with a focus on safety and operational performance.

Dietsmann Monte-Carlo S.A.M.

Gabian, MonacoUpdated Mar 2006

Leader in operation and maintenance for oil, gas, mining, and conventional and nuclear power production facilities worldwide, specializing in maximizing uptime with advanced inspection, AI, and robotics technologies.