• Gastar Exploration
  a publicly traded Canadian natural gas exploration and production company. "
• Gateway Energy
  "an emerging company in an important niche in the natural gas industry. Its focus is on the mid-stream segment - gathering, processing, transportation and marketing of natural gas."
• Gaz de France
  "a leader in the natural gas industry."
• GE Energy
  
• Gemini Solutions, Inc., (GSI)
  "an independent Petroleum Engineering Software and Consulting company. We provide comprehensive engineering services covering evaluation, development, and management of oil and gas reservoirs."
• Genesis Oil & Gas Consultants
  "Offshore and onshore work; specialising in production system optimisation, facilities definition and risk assessment for all phases and projects."
• Geocosm
  "specializes in applying and developing technology for modeling sandstone diagenesis and petrophysics"
• Geofizyka Toruń
  "offers professional well logging services, in deep open and cased holes and production wells. A full range of monitoring services for gas, mud and drilling parameters is also provided. "
• Geoform, Geological Consulting and Studies Ltd.
  "provides geological consultancy services for the petroleum, geothermal, civil engineering and groundwater exploration industry."
• GeoLine - Consulting Geotechnical and Pipeline Engineers
  "independent engineering consultancy company located in Denmark....We provide professional consultancy advice for the planning, design and supervision of geotechnical, pipeline and software engineering projects."
• GeoMechanics International
  "offering a wide range of geomechanical, petrophysical and wellbore imaging services to clients in the Oil and Gas, Geothermal, Environmental and Geotechnical industries."
• GeoModel, Inc.
  "an environmental and geophysical consulting firm. "
• Geophysical Exploration & Development Corporation (GEDCO)
  " a full service geophysical consulting firm...GEDCO offers professional services in 3D + 2D seismic design and interpretation, as well as potential field services"
• Geophysical Institute of Israel
  "a service company specializing in geophysical surveys for oil exploration, water development and site investigation, both locally and internationally."
• Geophysical Research Corporation
  "has a rich tradition of providing innovative products and the most reliable services available to our customers worldwide."
• GeoPotential Inc.
  "specializes in ENVIRONMENTAL & EXPLORATION GEOPHYSICS using gravity, magnetics, electromagnetics and ground penetrating radar."
• GeoScience Limited
  "We provide a whole range of services associated with the Earth Sciences and concentrate especially on those areas that need to use and assess information from deep wells and boreholes."
• Geoservices
  "as a prominent service company in the upstream sector (drilling and production)."
• Geotechnical Services Inc.
  "an employee-owned consulting firm specializing in Environmental Services, Geotechnical Engineering, Professional Drilling Services, Construction Materials Testing, Special Inspection Services and Micro Foundation Contracting. "
• Geotrace Technologies, Inc.
  " provides high technology 2D and 3D seismic data processing services software products and training seminars"
• Geotrade
  "Production, trading and maintenance of geophysical and geotechnical instrumentation."
• Gisco Geo
  "sales and service of geophysical instruments since 1952"
• Givot Olam Oil Exploration, Ltd
  "Givot Olam has found an oil structure in Israel which is estimated to contain a billion barrels of oil and 4 TCF of natural gas."
• GLJ Petroleum Consultants Ltd.
  "provides independent engineering and geological consulting services to the petroleum industry. Services include rigorous economic evaluations, technical studies, advice and opinions. "
• Global Companies LLC
  "is a diversified petroleum and energy marketing organization serving the fuel needs of a broad range of commercial and industrial interests throughout the United States and overseas. "
• Global Energy Company (GEC)
  " an active player in the Sub-Saharan African petroleum industry since 1992. The company specializes in the delivery of innovative products and applications in the fields of exploration geology, production engineering and energy advisory services, and has made its mark in these core activity areas."
• Global Industries, Ltd.
  "provides construction and diving services to the offshore oil and gas industry worldwide. "
• GlobalSantaFe
  "the only drilling contractor that gives our customers the option of purchasing from a full spectrum of drilling expertise. "
• Golder Associates
  "An International Group of Science and Engineering Consulting Companies"
• Goldston Engineering
  "a technology driven consulting engineering company providing marine, petrochemical and municipal engineering services."
• Goodwin PLC
  "part of the Goodwin plc group of companies and manufactures Dual Plate Check Valves for the Oil and Petrochemical Industries."
• Gorgon Australian LNG
• Grace, Shursen and Moore [GSM, Inc.]
  "an internationally recognized firm of registered consulting petroleum engineers. "
• Grand Directions
  "leverages the ability to understand the potential of a horizontal drilling project and partner with operators to develop their reservoirs using horizontal wells to rapidly recover hydrocarbon at a profit."
• Granherne Limited
  "The preferred provider of development solutions for the oil and gas industry around the world"
• Grant Geophysical, Inc.
• Grant Prideco
  "the world's largest manufacturer and supplier of oilfield drill pipe and other drill stem products and one of the leading North American providers of high-performance premium connections and tubular products. "
• GRDC Inc.
  "provides multi-parameter surface geochemical surveys for oil and gas exploration"
• Greene Tweed Oilfield Group
  "applies the core competencies of seal and electronic component design with elastomer and thermoplastic compounding/molding experience to handle critical service applications in oilfield exploration and production. "
• Greenstar Energy, L.L.C.
  "an oil and gas company involved in the acquisition and management of producing royalties (minerals) and overriding royalty interests. "
• Group Delta Consultants
  " is an experienced and highly responsive, small, minority-owned, engineering firm in Southern California offering a broad range of consulting services including Geotechnical Engineering, Geology, Hydrogeology, Materials Testing, Construction Inspection, Environmental Engineering and Forensic Services"
• Gulf Island Fabrication, Inc.
  "a leading fabricator of offshore drilling and production platforms and other specialized structures used in the development and production of offshore oil and gas reserves. "
• Gustavson Associates, Inc.
  "helping you navigate through a changing world."

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• H.J. Gruy and Associates, Inc.
  "a recognized international oil and natural gas consulting group providing expertise in all facets of the petroleum industry"
• Haas Petroleum Engineering Services, Inc.
  "an established oil and gas consulting firm"
• Habanero Resources Inc.
  "an oil and gas company with its primary focus based within California."
• Hager-Richter Geoscience, Inc.
  "a consulting firm offering quality professional services in geology and geophysics to the environmental and engineering community"
• Halliburton Company
• Hallin Marine Systems
  " provides high quality specialist services to the marine, survey, cable and offshore oil & gas industries."
• Harbison-Fischer Mfg. Co.
  "Best pumps in the oil patch^tm"
• Hardbanding Solutions
  "manufactures products that are used in the drilling industry for tool joints, drill collars and related parts."
• Harken Energy Corporation
  "explores for, develops and produces oil and gas reserves domestically [U.S.A.]and internationally"
• Harvest Energy
  a pioneer in the development of environmentally friendly road fuels for today’s drivers.
• Hasbrouck Geophysics, Inc.
  "Mining, Groundwater, Environmental & Engineering ..your 'Staff Geophysicist' "
• HCItasca
  "provide top-quality consulting services and software products related to the reaction of the geotechnical and hydrological environments to the actions of man. "
• Helmerich & Payne, Inc.
  " an energy-oriented company engaged in contract drilling and oil and gas exploration and production."
• Henderson Petrophysics
  "Consulting Formation Evaluation Services for the Oil and Gas Industry"
• High Arctic Well Control
  "Underbalanced drilling and snubbing services, snubbing equipment, oil and gas industry"
• High Pressure Equipment Company
  "developed a complete line of valves and affiliated components specifically for the unique requirements of the oil and gas industry."
• Hindustan Petroleum Corporation
• Hinton Energy
  "decades of experience in the onshore oil & gas exploration, production, drilling and project management sector"
• HIW Surveys Ltd., Land Surveyors
  "Dedicated to the study of geomatics"
• Horizon Offshore Contractors, Inc.
  "provides marine construction services to the offshore oil and gas industry, in the Gulf of Mexico and selected regions around the world."
• Hotwell Well Logging Equipment
  "we strive to provide good service"
• HRH Limited
  "an oilfield service company based in Aberdeen, Scotland specialising in the supply of geological products and services."
• HTP Services
  "is a private limited company, specializing in procurement and trade within petrochemical, oil, gas and powergeneration industries together with all related businesses."
• Hunt Oil Company
  "a privately held exploration and production company....focused on the exploration for, and development of, oil and gas."
• HUNTING Oilfield Services International (HOSI)
  " a vertically integrated OCTG provider with sales, service and manufacturing facilities located throughout the major petroleum centers of the world."
• Husky Energy Inc.
  "a Canadian-based integrated energy company serving global customers"
• Hycal Energy Research Laboratories Ltd and Hycal Environmental Sciences Ltd.
  "reservoir engineering and geological testing to optimize reservoir production... Superior service for your environmental testing, consulting, remediation and biological product manufacturing needs."
• Hydraulic Rod Pumps International
• Hydril
  "Leadership in Quality Oilfield Equipment for Over 65 years
• Hydrocarbon Engineering Associates
  "a group of senior technical professionals with in-depth engineering and scientific experience in diverse disciplines, who provide a wide range of services to energy, chemical and related businesses. "
• HydroGEOPHYSICS, Inc.
  "a geophysical consulting and service company. We specialize in the application of non-invasive, non-destructive geophysical methods to environmental, hydrological, civil, and geological engineering problems."
• Hyduke
  "an integrated oilfield services company specializing in the manufacture, repair and sale of oilfield equipment and supplies. Our range of products and services include oilfield service rigs, drilling rigs, pump trucks, generator & combination buildings, pneumatic controls, various models of truck mounted cranes, oilfield supplies, drilling tools, engineering services, and machining & fabrication services."

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• IBM - Chemicals & Petroleum
  "Your source for Petroleum industry information"
• ICO, Inc.
  "serves the global petrochemical, energy and steel industries by providing high technology equipment and services for petrochemical processing and oilfield services."
• IESCO International Energy Services Company
  "IESCO's mission is to be the premier provider of nondestructive examination and technical services to the petroleum, petrochemical and power industries "
• IHS Energy Group
  "The leading resource for worldwide oil and gas exploration, production and development information."
• ILF Consulting Engineers
  "one of Europe's leading multi-disciplinary firms providing engineering, planning, project management and environmental services to major clients in the petrochemical, heavy industrial and public utility sectors."
• Imex Canada Inc.
• Imperial Oil Company, Ltd.
• Inbal Valves
  "developed and are manufactured by Mil Ltd."
• Indeva Energy Consultants
  "provides deterministic analysis through to leading edge economic and risk analysis consulting and systems to the oil and gas industry."
• IndigoPool.com
  "an industry-unique global gateway for clients to market oil and gas properties and data."
• Industrial Rubber, Inc. Oil Tool Division
  
• Infield Systems Ltd
  "one of the industry leaders in providing accurate and up to date information on the worldwide offshore oil and gas field development industry."
• Infoterra
  "aims to become a world leader in provision of next generation geographic information products and services. "
• Injectek
  "offering extremely low cost, practical mold flow analysis. "
• Inmarsat
  "has the solutions - all the links that companies, organizations and business people need for instant information, instant communications, and safety and control."
• Innova Electronics Inc.
  "specializes in the design, development and production of high-reliability, elevated-temperature instrumentation electronics. Primarily targeted for the oil service industry, where high reliability and extreme environmental conditions are the rule"
• Input/Output, Inc. [I/O]
  "the world's leading designer and manufacturer of seismic data acquisition equipment, systems and related products. Our company is the only independent supplier of seismic acquisition systems for the use in every exploration environment: land, transition zone (marshes, swamps and tidal zones), and at sea. "
• Integra Resources, Ltd.
  "organized to identify, evaluate, acquire and optimize oil and natural gas properties and to explore for, develop and produce oil and natural gas drilling prospects in Western Canada that management determines are suitable having regard to the business strategy of Integra."
• Integrated Geophysics Corporation
  "a leader in interpreting and integrating multiple geophysical techniques for the petroleum and mineral industries"
• Integrated Production Services
  "offers a unique combination of essential services, advanced technologies, and production engineering to help its oil and gas producing company customers meet their primary objective of profitable hydrocarbon development."
• Interactive Interpretation & Training, Inc.
  "leading edge technology in interactive geological and geophysical interpretation, integration of these data with reservoir data, modeling, training and support services."
• Interline Resources Corporation
  "participates in three areas of business: used oil refining, oil and gas and commercial and industrial construction."
• International Reservoir Technologies
  "provides worldwide petroleum reservoir management consulting. We specialize in using the latest state of the art modeling technology and methodology in developing new reservoirs as well as evaluating, and planning the depletion of petroleum resources through fully integrated reservoir studies."
• Intership Ltd.
  "provide offshore DP construction / supply / accommodation and crane vessel services to the oil & gas offshore industry. "
• Intertek Caleb Brett
  "a leading provider of laboratory, research and inspection services for global industry, markets and institutions."
• Invensys
  
• IR Oil Rigs
  "the holding company for a group of businesses involved with the internet, petroleum and industrial chemicals trading, agricultural and plantation development, oil and gas exploration and diversified petroleum industry related services."
• IReservoir.com
  "provides world-class consulting services to oil and gas companies using state-of-the-art geoscience and engineering technologies."
• Irontech Rig Repair and Manufacturing
  "a Canadian owned and operated company based in Edmonton, Alberta, Canada. We specialize in the manufacturing, rebuilding, and complete repair of new and used Service Rigs, Mobile Pump Trucks, Mud Tanks, Doghouses, and associated Handling Equipment."
• ISA the Data Management Specialists "specialise in delivering Data Management projects and innovative Software Technologies to  Oil and Gas companies around the globe."
• Isco, Inc.
  "manufactures a wide range of products for professionals working in water pollution monitoring and abatement, engineers and managers involved with wastewater process control, and scientists involved in field and laboratory work."

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