• Dave Easom Production Company "located in historic Natchez, Mississippi, where our company philosophy is to generate, drill, develop, and produce oil and gas profitably."
• David Fox Associates
  "an upstream petroleum consultancy. We can demonstrate an extensive track record of adding value to international upstream petroleum projects at every phase of their life cycle"
• Davis-Lynch Inc.
• Dawson Geophysical
  "acquires and processes 3-D seismic data used in determining whether subsurface geologic conditions appear favorable for accumulations of oil and natural gas."
• DeGolyer and MacNaughton
  "Worldwide Petroleum Consulting"
• Deep South Chemical, Inc.
  "a worldwide provider and leading single source of first class chemicals and specialty wellbore cleanup tools for the oil and gas industry."
• Delta Environmental Products^TM
  
• Denbury Resources Inc.
  "oil and gas exploration, acquisition, development, and production company."
• Derek Resources Corporation
  "defined a corporate strategy focused on establishing new production from reservoirs containing significant quantities of oil, which were previously uneconomic to recover using conventional means. "
• Desco International
  "an oilfield equipment repairs/supply workshop based in United Arab Emirates servicing oil & gas sector and drilling contractors in the region and neighboring countries"
• Descon Engineering
  "a premier engineering and construction firm offering a comprehensive package of services to clients in Pakistan and the Middle East"
• Detechtion Technologies LLC
  "The future of compressor optimization"
• Deutsche Montan Technologie GmbH
  "Independent technology services in testing, certification, consulting, engineering, measuring and development in Germany and abroad with emphasis on raw material, safety and infrastructure"
• Devin International, Inc.
  "built a reputation on having unique and hard to find specialty equipment. Our experienced staff insures you are provided equipment that make your job site safer, allow you to save time and work more efficiently. Whether your project is on land or offshore, shelf or deep water, DEVIN's inventory of products provide the solution for costly down time."
• Devon Energy
• Dexsil Corp.
  "manufactures portable test kits and instruments for the detection and quantification of contaminants in soil, water and oil."
• DH Instruments, Inc.
  "founded in 1980 with one objective... to provide superior calibration solutions through innovative technology, first rate service and uncompromising metrological integrity."
• DHV International
  "provides downhole video services to the oil and gas industry for fast, accurate diagnosis of wellbore problems. "
• Diamond Offshore Drilling, Inc.
  "a leading deepwater drilling contractor, owns and operates one of the largest fleets of offshore drilling units in the world. "
• Diamond Services Corporation
  "Serving the entire Gulf Coast"
• Diaz Resources Ltd.
  "a newly re-organized oil and gas company managed and controlled by a team with considerable experience and success in the exploration field... presently focusing its efforts on natural gas exploration in southern Alberta."
• Dickirson Corp.
  " a full-line manufacturer and distributor of drilling, well service and transportation products for the oil and gas fields of northeastern United States and the World."
• Digital Oilfield
  "real business solutions for real people"
• Dion & Sons
  "founded in 1930 ... to supply fuels and oils to Southern California's drilling industry. Today, we are proud to continue a tradition of providing quality products and superior service to a wide variety of industrial users"
• Directional Drilling Contractors LLC
  ", a leader in innovation design and implementation of oilfield tools and are continually striving to find the most effective way to fulfill the needs of our customers in all aspects of directional drilling."
• Directional Technologies, Inc.
  "provides horizontal directional drilling, horizontal well installations, and well installations related services such as well placement, design, and development. "
• Dolphin a.s.
  "a Fred. Olsen related Company providing the offshore industry with efficient and reliable services within the areas of Rig Management, Well Services, Subsea Contracting and Engineering"
• Domain Engineering
  "provides engineering services for the petroleum, gas processing and petro-chemical industries. Services include process modeling, detailed design, debottlenecking, optimization, procurement, construction and project management. "
• Dominion Exploration and Production
  "the natural gas exploration and production subsidiary of Dominion. The company is one of the largest independent natural gas and oil operators. "
• Dormer Engineering
  "Soil Drilling, Soil Sampling & Associated Equipment....design and/or manufacture special equipment to your requirements with minimal delay."
• Double Eagle Petroleum and Mining Company
  "with principal activities in the Rocky Mountain Region .... The company acquires, drills, develops, and operates oil and gas properties."
• Douglas Drill Services, Inc.
  "As international specialists in parts, service, and repairs, we can ship parts, do repairs in-house, or send field service. From Texas to Thailand, Columbia to China, we'll do whatever it takes to get you up and running quickly. We service and sell new an used waterwell, oil & gas drills and drill parts."
• Douglas-Westwood Ltd.
  "a leading energy market research and consultancy house"
• Dravis Interests, Inc.
  "Consulting and Training Services in Carbonate Geology Applied to Petroleum Exploration and Reservoir Development "
• Drilling Systems (UK), Ltd.
• Drives, Incorporated
  "has become a leading manufacturer of ANSI Precision Roller Chain, Pintle Chain, Agricultural Conveyor Chain, Engineering Class Chain, Oil Field Roller Chain and Auger products. "
• Due North Resources
  "Geological and Environmental consulting."
• Dunelm Drilling Company Ltd.
  "has been successfully operating for over 30 years in the specialist field of Site Investigations and Geotechnical Engineering"
• Dynalco Controls
  "designs and manufactures rugged industrial instrumentation and control equipment. Our products are at work in a multitude of extreme environments including temperature, vibration, moisture, dust, and hazardous locations."
• Dynatec Drilling Services Division
  "a growing mining company and a leading provider of mining and metallurgical services."

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• E2 Business Services Inc.
  " Your total solution well-head partner"
• E & E Services
  "Manufacturer of oil tools & replacement parts for the well servicing industry such as oil saver & oil saver pumps etc. Custom machining is also available."
• Eadie Group
  "heavy oil processing/used oil recycling technology"
• Earth Dynamics
  "Engineering geophysics, vibration and noise monitoring, and rock mechanics"
• Earth Satellite Corporation (EarthSat)
  "a leader in the application of remotely sensed data for the exploration, development, and management of the Earth's resources"
• Earthview Associates
  "provides worldwide consulting and training in geology, geophysics, and biostratigraphy. The company's toolkit is used to open new plays, analyze sweetspots at the field and basin scales, evaluate acquisitions, and figure out unusual geology."
• Echometer Company
  "the leading supplier of instruments, software and training to analyze and optimize the performance of oil, gas and water wells throughout the world. All of the instruments and sensors are used at the surface of the well and are easily portable. "
• ECOPETROL, Empresa Colombiana de Petróleos
  "oil and gas company from Colombia South America"
• EDCON Worldwide Gravity & Magnetics
  "We perform effective G & M surveys and deliver high-quality geologic information that help you save money in exploration and production by reaching sound geologic decisions."
• EDG - The Engineering Development Group, Inc.
  "provides full professional engineering, project management and construction services to clients worldwide in the oil & gas, chemical and refinery industries."
• Edge Petroleum Corporation
  " Houston-based independent energy company with a focus on natural gas exploration, emphasizing the integrated application of advanced 3-D seismic data integration and visualization techniques. Edge operates onshore along the Gulf Coast of the United States."
• Egep Consultores S.A.
  "Sub-surface and Surface Engineering, Improvement of Reservoir Exploitation,Technical Assistance: Reservoir, Geology, Geophysics, Petrophysics Conceptual Design - Delegated Management, Operation of Oil and Gas Fields"
• Elmar: a Varco Company
  "The world's leading manufacturer of wireline equipment, perforating hardware and casing services "
• Elastec/American Marine
  "Manufacturers of environmental products, including a range of skimmers, boom, fire boom, incinerators, fumigation tarps, vacuum systems, portable tanks, boats/pumps, and oil spill related equipment."
• Elder Tools International
  "a USA provider of downhole tools with a 'world class' reputation for its products, its prices and its unbeatable customer service."
• Elohi Geophysics, Inc.
  "new approach to sources, sensors, data processing and interpretation. was formed to develop and bring to market the tools and techniques required for shallow investigations."
• eLynx Technologies
  "provides real-time data collection, production reporting, monitoring and control - via the internet - for the oil and gas industry. "
• Emerald Energy Plc
  " a United Kingdom based company engaged in exploration and production of hydrocarbons in Colombia, the exploration for hydrocarbons in Argentina and Denmark and the development and production of oil and gas from leases in the Appalachian basin in the United States of America."
• EMK3 Energy Marketing
  "the first online energy marketplace offering domestic buyers and sellers of oil and natural gas the ability to electronically purchase and sell production at the earliest possible point in the supply chain: at the well. "
• Empire Oil & Gas NL
  "an independent company that specialises in providing low-cost surveys, inspections and maintenance services for pipeline systems."
• EMSI (Equipment & Meter Services Inc.) Online
  "Sales and Service of Liquid Handling Equipment to the Petroleum, Chemical, Water & LPG Industries"
• Enbridge Inc.
  "We will go beyond all others to deliver energy and related services to North American and international customers."
• EnCana Corporation "one of the world's largest independent oil and gas companies driven to be the industry's best-of-class benchmark in production cost, per-share growth and value creation."
• Energen Corporation
  "a diversified energy company involved in natural gas distribution and oil and gas exploration & production."
• The Energists
  "a management consulting firm specializing in executive search within the energy industry. "
• Energy Research Company
  "an industrial R&D and consulting company specializing in energy intensive and emissions related technologies and industries"
• Enerplus Group
  "Canada's largest and most experienced Royalty Trust Fund Manager specializing in the acquisition, development and exploitation of proven, producing oil and gas properties in Western Canada."
• Engineering Partners International (EPI)
  "dedicated team of multi-state, licensed Professional Engineers and diversified expert consultants. We continue to offer a growing selection of engineering and forensic services to law firms, insurance companies, and public and private sectors of industry. "
• Engineering Seismology Group [ESG]
  "a world leader in microseismic monitoring. "
• Enron
  
• ENSCO International, Inc.
  "one of the largest offshore drilling contractors in the world"
• Enterprise Products Partners, L.P.
  "leading independent gatherer and transporter of natural gas and oil"
• Entrac Petroleum Training & Consulting
  "Contact us for all your training needs in drilling, casing design, well planning, reservoir engineering and geology. "
• Enventure Global Technology
  " setting the standard for Solid Expandable Tubular (SET™) Solutions for the well construction industry. "
• Enviance
  " provides leading systems and services to industry and government for environmental data management. "
• Enviro-Logical Solutions (ELS)
  "Providing tomorrow's solutions, Today"
• Environmental BioTechnologies, Inc.
  "(EBT) is focused on providing biological based products, processes, and services for use in industrial and environmental applications. A core expertise in microbial physiology and applied microbiology allows EBT to support a range of services for industrial, environmental, and consumer markets. "
• Environmental Mechanics AB
  "has been developing various data acquisition systems since 1985. Our main focus has been on equipment for MWD, Measuring While Drilling."
• EOG Resources, Inc
  "striving to become simply the best independent exploration and production company "
• EOSYS
  "main goal is to supply its customers - usually engineering departments in industrial corporations - with 3D descriptions of the underground as accurate as possible and to make them aware of existing uncertainties. "
• EP Tech
  "The Fracture Modeling Experts "
• Epic Consulting Services Ltd
  "a reservoir engineering consulting firm actively engaged in serving the oil and gas industry, domestically and internationally. Epic specializes in all aspects of reservoir engineering and simulation. "
• EPL Energy Partners Ltd.
  "an independent oil and natural gas exploration and production company based in New Orleans, Louisiana."
• eProduction Solutions
  "mission is to be the leading provider of well controlled solutions and integrated decision management solutions designed to enhance oil and gas production. We will accomplish our mission by providing integrated solutions that include a comprehensive set of products, services, and technologies that when combined help our customers effectively optimize production."
• Equipoise Solutions Limited
  "focussed on the geology and geophysics of reservoir definition, for both exploration and development."
• Essar Oil
  "[our]mission is to be a fully integrated oil company involved right from oil exploration to the downstream sectors of marketing oil products and petrochemicals. "
• ESSO
• ESTec Oilfield Inc.
  "manufactures a 150 ton top drive designed specifically to fit into a double rig without modification."
• Eurogas Corporation
  "an independent oil and gas company engaged in exploration, development, production and acquisition activities in Tunisia, Spain, Russia and Canada. "
• Excel Engineering
  "a consulting engineering company with highly experienced professionals specialized in upstream oil and gas related facilities design. Excel provides a full range of engineering, procurement and project management services for both offshore and onshore projects worldwide. "
• Exco Resources Inc.
• EXPLORTECH
  "can help your company find and develop more oil and gas with their experience in the integrated application of emerging 3C and enhanced AVO technology."
• Expro Group
  "a leading international oilfield services company that surveys and manages oil and gas wells, from exploration through to development and production."
• Exterran
  "focuses on delivering a Total Solution for your oil and gas production and processing facilities in every major hydrocarbon region around the globe."
• Exxon Mobil Corporation
  "Formed by the combination of two high-caliber organizations, Exxon and Mobil, the company is an industry leader in almost every aspect of the energy and petrochemical business."

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• Falcon Drilling Ltd.
  "an International Diamond Drilling Company. We can provide specially manufactured drills for a variety different purposes."
• Falcon Field Service, Inc.
  "Officers and personnel have over 25 years of experience in pipeline construction and environmental remediation"
• Falcon GDP Inc.
  "Geological Drilling Products for Exploration Construction and Abandonments"
• Fann Instrument Company
• Farmer Energy Service
  "an Illinois Basin company involved in exploration and development of coalbed methane and New Albany Shale reserves"
• Faroe Petroleum plc
  an independent oil and gas company focused on value creation through exploration and appraisal drilling in the Atlantic Margin, North Sea and Norway."
• Fekete Associates, Inc.
  "a Canadian petroleum engineering consulting firm servicing the oil and gas industry, both domestically and internationally, for over 20 years."
• Fenstermaker & Associates
  "Surveying services, Engineering capabilities, comprehensive Environmental services"
• Ferguson Beauregard
  "has been in the forefront of the industry search for innovative solutions to production problems. From self-contained plunger-lift systems and electronic controllers to fully integrated, remotely managed production systems, our goal is to deliver immediate results for you. "
• Fidelity Oil Group
  "engaged in oil and natural gas acquisition, exploration and production activities throughout the United States, the Gulf of Mexico and in Canada."
• Five States Energy Company
  "a Dallas-based private oil and gas investment company specializing in high quality proved producing oil and gas properties. Five States strives to excel in the efficient administration of oil and gas assets."
• Flexifloat Modular Barges - Robishaw Engineering Inc.
• Flint Energy Services, Ltd.
  "an integrated midstream production services provider headquartered in Calgary, Alberta, Canada. From the wellhead to the plant gate, Flint provides a full range of integrated midstream production services to North America's energy and resource industries."
• Flow Science Incorporated
  "consulting engineers for fluid problems"
• Flow Simulations, Inc.
  "a ... fluid flow consulting firm. The company provides simulation services for industry using computational fluid dynamics (CFD)"
• Flowline Alaska
  "founded in 1981 to service the expanding needs of the oil companies developing and operating the oil fields in Alaska. "
• Flying J Inc.
  "is a fully integrated petroleum company engaged in the exploration, production, refining, transportation, wholesaling and retail marketing of petroleum products. "
• FM Equipment Company
  "we carry all the popular marine centrifuger for the marine and oilfield industries ...In addition to sell these machines, we are equipped to offer start-up assistance, after sales service and we stock most commonly used spares associated with the marine and oilfield separators."
• FMC Technologies Inc.
  "a global leader in providing solutions for customers engaged in petroleum exploration, production, measurement and transportation. Those solutions include the design, manufacture and supply of technologically sophisticated systems and products to the oil and gas industry."
• Forrest A. Garb & Associates, Inc. (FGA)
  "a geological and petroleum engineering consulting firm comprised of a staff with centuries of world-wide experience. "
• Forest Oil Corporation
  "engaged in the acquisition, exploration, development, production and marketing of natural gas and liquids throughout North America and selected international locations."
• Foster Wheeler Corporation
  "a global company offering a broad range of design, engineering, construction, project development and management, research, plant operations and environmental services....designs, engineers and constructs oil- and gas-field development projects, petroleum refineries, chemical, petrochemical, pharmaceutical and industrial plants worldwide."
• Frontier Oil Corporation
• Fugro Airborne Surveys
  "the most versatile and technologically advanced airborne survey company in the world. Through a network of offices spanning the globe, Fugro Airborne Surveys provides comprehensive geophysical mapping technologies for a wide variety of applications."
• Fugro Chance Inc.
  "a member of the Fugro Group of companies, offers a wide range of marine survey services and engineering solutions utilizing the latest technology. These services encompass marine operations, construction survey, navigation, international and SHOALS divisions."
• Fugro-LCT
  "providing services in gathering and interpreting many types of geophysical data, used for the qualitative and quantitative estimation of oil, gas and mineral sources and the optimisation of their exploitation"
• Fugro N.V.
  "a multi-national group of consulting engineers which supplies advice, technical applications and surveying operations. The group acquires and interprets data for its clients and supplies positioning services."
• Fusion Geophysical
  "offers a full range of data analysis and modeling dealing with data from every stage of exporation, development and production"
• FX Energy Inc.
  "focuses on high potential oil and gas exploration with low financial exposure"

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