- Ammonite Resources
 - Offers technical and economic evaluation of petroleum and mineral resource investments. - Banks Information Solutions
- Researching and providing documents and aerial photographs for the environmental, oil and gas industries.
- Camin Cargo Control
- Provides professional inspection and laboratory services to the petroleum and petrochemical industries, including sampling, inventory control, marine consultation, loss control, information technology, agricultural, and petroleum additive services.
- Crostek Corp
- Specialises in pipeline consulting.
- CTI Refining and Advantage Insight Group
- Companies that provide technical and economic advice to the petroleum industry in Canada and abroad.
- Deane Group, The
- Consultancy services to Ukraine's oil and gas industry and to foreign oil companies wanting to enter Ukraine.
- DeGolyer and MacNaughton
- Worldwide petroleum consultants.
- Endeco International
- Consulting services include refinery management, operations, maintenance and engineering, and planning.
- EnSys Energy and Systems
- Consulting services focusing on petroleum refining, economics, technology, investment, regulatory, fuels and market analyses, LP optimisation, energy modelling, and software including the WORLD modelling system.
- Geochem Group, Ltd.
- Geological consultants to the oil industry and UKAS accredited environmental laboratory services.
- Global Energy Associates
- Provides consultancy, training, and associated technical services to emerging and established gas markets, as well as individual commercial companies and public organisations.
- Goddard & Associates Inc.
- Offers services in key areas including engineering, geology, geophysics, commercial development, and technical training to companies who are seeking to participate or are actively engaged in ventures inside Venezuela.
- HMT Inc.
- Provides parts and services for ASTs to include tank inspection, maintenance and repair, construction, engineering and design, painting, coating, and fabrication services.
- Holland Offshore Consulting
- Independent management and consultancy company, providing operational and project services to the oil and gas industry.
- Honeywell Hi-Spec Solutions
- Supplier of applications, training, and services for the hydrocarbon processing, chemicals, and pulp and paper, and oil and gas industries.
- IndigoPool.com
- Provides a global gateway for clients to securely market oil and gas properties, prospects, and data.
- Industrial Serices Networld (ISN)
- Online community for the delivery of real world solutions, resources and services within the petrochemical industries.
- John Perez Graphics & Design, L.L.C.
- Provides oil and gas graphics to the petroleum and energy industries.
- KBC Advanced Technologies
- Provides consultancy and support services to owners and operators of oil refineries.
- Kemp Group, The
- Sales and marketing consulting firm to the oilfield service industry.
- Lloyd's Register
- International risk management organisation with operations covering marine activities, management systems, land-based industries, railways, and oil and gas.
- Lundberg Survey
- Independent market research company specialised in the U.S. petroleum marketing and related industries.
- Mentors, The
- An oil and gas consulting firm that specialises in developing and marketing geological reports, and in training and mentoring services.
- Netherland, Sewell & Associates, Inc. (NSAI)
- Providing petroleum, engineering, geological, geophysical, and petrophysical consulting in field studies, oil and gas reserve certifications, economic evaluations, and operations management.
- Overload Services, Inc.
- Specialising in software training and consulting the petrochemical industry.
- Pace Project Services
- Offers the Performance Forum, a data analysis and benchmarking forum for the upstream oil and gas industry.
- PanTerra Geoconsultants B.V.
- Providing services to the international oil and gas industry.
- Pauley Geoconsultants Limited
- Geology and petroleum consulting specialising in sedimentology, petrography, and diagenesis.
- Petroleum Capital Markets
- Offers financial services and technical consulting for small to mid-size public or private companies involved in various aspects of the petroleum industry.
- Petroleum Economics Limited (PEL)
- Energy forecasting and consulting.
- Petroleum Finance Co.
- Consulting services specialising in the financial, strategic, commercial, and political aspects of the international oil and gas industry.
- Petroleum Revenue Services
- Contract compliance firm specialising in the oil and gas industry.
- PQ Optimization Services
- Provides model-based process consulting for petroleum refiners with specialties that include hydrocacking, hydrotreating, and hydrogen management.
- Randall and Dewey
- Provider of transaction and related services to the upstream oil and gas industry.
- Refinery Automation Institute, LLC
- Consulting services include: blending; oil movements and storage; tankage optimisation; automation master plans; and training.
- Ridge & Associates, Inc
- Ridge and Associates, Inc. Consulting Engineers, a full service engineering company, which specialises in Petroleum and Flammable Liquid Handling and Loading and Airport Fueling Facilities.
- Rike Service, Inc.
- Consulting and management services for the petroleum industry.
- Robert R. Austin, Inc.
- Provides international business development, marketing, sales, and management services.
- Robertson Research International Limited
- Consulting and service company to the petroleum industry.
- RPC Incorporated
- Provides technical and support services to the oil and gas industry.
- SGS Oil, Gas & Chemicals Services
- Provides independent inspection, testing, verification, and specialised technical services to the oil, gas, and chemical industries.
- Stellar Energy Advisors Limited
- Acquisition, divestment, and strategic advisors to international oil and gas companies.
- Sure Flow Consulting Services
- Offers drilling, wellsite, pipeline, abandonment, and other oil and gas industry services worldwide.
- Tobosa Exploration, Inc.
- Oil and gas consulting including property appraisals, lease operating services, due diligence reviews and other engineering and geological services.
- TotalFinaElf Belgium
- Offers refining and marketing for chemicals and oil.
- United Oil & Gas Consulting Ltd.
- Independent petroleum consultancy specialising in reservoir engineering and geology, as well as economic evaluation.
- Woodhill Engineering Consultants
- Specialising in multi-discipline design and operations work, including safety, environmental and cost estimation.
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