• Tap Oil Limited
  "an oil and gas exploration and production company operating exclusively on the North West Shelf of Western Australia and the Northern Territory."
• Target Finders [UK]
  "We can provide the skills and software to ensure that your seismic surveys provide the best possible basis for a successful exploration and development project."
• Taurus Petroleum AB
  
• Taylor Made Oil Tools
  "Design and manufacturing company for a complete line of specialty tools to run on Coiled Tubing, Snubbing, and Wireline. The company also specializes in Thru-Tubing Tools."
• TCA Reservoir Engineering Services, Inc.
  "Reservoir Engineering, Numerical Reservoir Simulation, Enhanced Oil-Recovery Processes
• TD Williamson Inc.
  "specialty firm that manufactures the world's most complete line of pipe maintenance and service equipment for any transmission, distribution, oil or industrial piping application"
• TDL International, Inc.
  "specializes in the evaluation of oil & gas wells but also tracks events affecting the entire industry. "
• Technical Drilling Services (TDS Inc.)
  "provided mud logging and consulting services on over 5,000 thousand wells."
• Technos
  "Site Characterization Specialists"
• Tejas Research & Engineering, LP
  "a consulting eningeering firm dedicated to providing down-hole Oil Service industry with a cost effective resource that responds to a client's product development needs"
• Teledyne Isco
  "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. "
• TEMCO, INC.
  "internationally recognized as a leading supplier of core and fluids testing instruments for oil and gas production. "
• Tenaris
  "Tubular technologies Innovative services"
• Tengasco, Inc.
  "an independent, fully diversified energy company involved in natural gas exploration and production, gas marketing, pipeline construction, and other energy services"
• Terracon
  "a leading consultant in the fields of geotechnical, environmental, pavements, materials and facilities engineering and related services"
• TerraDat Geophysics [UK]
  "Geophysical contracting and consulting services"
• Terralog Technologies, Inc.
  "aninternational service company that is the only industry provider of an integrated package of on-site oil field waste injection design, operations, and monitoring that also combines their expertise in Petroleum Geomechanics.."
• TerraTek, Inc.
  "A Geotechnical Engineering Company that provides Services and Testing Equipment to the Oil and Gas Industry Worldwide."
• Tesco Corporation
  A global provider of innovative, technology-based solutions to the upstream energy industry
• Texaco Online
• Texas Drilling Associates
  Provides consulting engineering services to the oil industry around the world, focusing on drilling technologies, technology transfer, and training.
• Texas Drilling Company
  Oil, gas and geothermal drilling contractor. Domestic and international
• TGS-NOPEC
  "a leading global provider of non-exclusive seismic data and associated products to the oil and gas industry. "
• Theta Enterprises, Inc.
  "Theta Enterprises supplies the petroleum industry with advanced rod pumping system computer software and state-of-the-art artificial lift training."
• TICORA Geosciences, Inc.
  "specializes in unconventional natural gas resources, such as coalbed methane, fractured shale, and tight gas sands. "
• Tidelands' Geophysical Company
  "has maintained it's national position as one of today's leading geophysical data-gathering companies."
• Tidewater Inc.
  "The Premier International Energy Service Company and Home of the World's Largest Workboat Fleet"
• The Titan Group
  The first Malaysian producer of olefins and polyolefins
• TIW Tools
  A tradition forged in the oil industry
• Top-co Industries Ltd.
  "the design, manufacture and supply of casing accessories for cementing completions."
• Total
  "one of the leading oil companies in the world. With operations in more than 100 countries, the Group's activities span all aspects of the energy industry from Upstream - oil and gas exploration and production - to Downstream - refining and marketing of refined products as well as international trading in both crude and refined products."
• TowerScan
  "established in order to provide the highest level of quality and service in the process troubleshooting and optimization industry."
• Tracer Technologies International, Inc.
  "specializing in oilfield and process tracing and Radiological Services."
• Tracerco
  "a global organisation who provide advanced process diagnostic and specialist instrumentation to the process industry which reduce operating costs, optimise production and minimise shutdown periods."
• Tradequip International
  "the energy equipment marketplace"
• Tradico International
  "the leading ompany in the Benelux region, supplying tank-related products"
• Trans Ocean Distribution Limited
  "the world's largest Flexitank operator"
• TransAtlantic Petroleum Corp.
  "an international oil and gas exploration and production company"
• TransCanada
  "transmits, markets and processes energy for customers in Canada, throughout North America, and around the world.... Additional activities in energy marketing and energy processing extend TransCanada's reach."
• TransGlobe Energy Corporation
  "a public company which has been involved in oil and gas exploration and production since 1992."
• Transocean, Inc.
  "the world's largest offshore drilling company
• Treadwell & Rollo
  "a nationally recognized environmental and geotechnical consulting firm."
• Tri-State Energy Resources, Inc.
  "an Illinois Basin company involved in exploration and development of coalbed methane and New Albany Shale reserves."
• Tri-Valley Corporation
  "in the business of exploring, acquiring and developing prospective and producing petroleum and mineral properties and interests"
• Trican Well Services, Ltd.
• TRICAT, Inc.
  "facility located in McAlester, OK, regenerates a wide variety of spent catalysts and adsorbants from the oil refining, petrochemical and chemical industries using patented ebullated bed regeneration technology."
• Trinidad Inspection Services Ltd. (TIS)
  "services to major oil and gas producers, drilling companies, gas transmission companies, refineries, processing plants, power plants, and utility distributors, both foreign and domestic."
• TROW Associates, Inc.
  "one of the largest engineering and consulting firms in Canada"
• Truestar Petroleum Corporation
  "a resource exploration and development company directed by a team of experienced industry professionals"
• TTG Systems, Inc.
  "we maximize employee performance through the integration of technology, learning content and services into a corporate eLearning strategy that targets employee safety and compliance issues."
• TTL Inc.
  "Practicing in the Geosciences"
• Tucker Energy Services
  "a company committed to supplying quality services, logging data and solutions to the oil and gas industry."
• Tullow Oil plc
  "an international operator specialising in emerging markets, mainly gas to power in the Indian Subcontinent and Africa."
• Tundra Oil and Gas Ltd.
  "a privately owned Winnipeg-based Company with oil and gas production in Manitoba, Saskatchewan, and Alberta. "
• Turkish Petroleum Company
• Twining Laboratories, Inc.
  "analytical chemistry, environmental services, geotechnical engineering, drilling services, construction inspection & materials testing"
• Tyumen Oil Company's
  "one of Russian[sic] largest oil companies"

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• Ultra Petroleum Corporation
• Ultraspin Technology Pty. Ltd.
  "manufacture oily water separators and oil skimmers. Our separators are based on innovative designs of hydrocyclones that use strong centrifugal forces to the oil.”
• United Oil & Gas Consulting Ltd.
  "for the most reliable reservoir engineering, economic evaluation and geological services on time and on budget"
• US Oil & Gas Corporation "exploration and development projects in Illinois, Kentucky and Indiana."
• USCapital Energy, Inc.
  "an energy exploration company"
• UTS Energy Corporation
  

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• V & M STAR
  "is North America's leading producer of seamless tubular products mainly dedicated to oil and gas applications."
• VAALCO Energy, Inc.
  "a Houston-based independent energy company principally engaged in the acquisition, exploration, development and production of crude oil and natural gas. "
• Valenti Engineering Services, Inc.
  
• Valero Energy Corporation
  diversified energy company engaged in the production, transportation and marketing of clean-burning fuels and natural gas.
• Vallourec & Mannesmann Tubes, Corp.
  "a world leader in the production of seamless hot-rolled steel tubes of all kind."
• Vam Pts Company
  "Specialty threading and service is our business."
• Van Meurs Corporation: Energy Consultants
  Oil & Gas Consulting, Training and Petrocash online database
• Vanco Energy Company
  "an independent, international oil and gas exploration and production company with activity offshore West Africa. "
• Veco Corporation EPC
  "an integrated, full-service engineering, procurement, and construction firm, provides multi-discipline engineering, material management, and construction management services" experience."
• Vector Seismic Data Processing, Inc.
  "To provide the world of exploration with quality seismic solutions through our commitment to leading-edge technology, ongoing research and development, integrated services, and diversified
• Vector Magnetics LLC
  "the inventors and developers of the electromagnetic downhole proximity measurement"
• Venable Royalty Ltd.
  "Dallas based partnership focused on buying oil "
• Venoco Inc.
  "one of the fastest growing oil companies in the United States. It has achieved its growth by focusing on the acquisition and enhancement of oil and gas properties."
• Ventech Companies
  "provides complete engineering, procurement, construction and start-up services to the refining, gas processing and petrochemical industries on an international basis."
• Veris Industries
  "the leader in energy automation sensors."
• Veritas Associates
• Vermilion Resources Ltd
  "an international oil and gas exploration, development and production company based in Calgary, Alberta, Canada"
• Versatech Products Inc.
  "designing and manufacturing oil spill containment and recovery products for over 30 years. "
• Vertex Petroleum Systems
  "providing the production engineer with a tool to predict flow potential from a well or wells based on a variety of possible development models, and to quickly evaluate the economic consequences of each case. "
• Vikoma International Limited
  "world leaders in the design, manufacture and supply of oil spill response equipment."
• Vindum Engineering
  "established in 1987 as a source of specialized equipment for the PetroChemical industry, specifically Core Analysis. We have since expanded into many other fields requiring precision equipment...."
• Vista Resources, Inc.
  "a well-established, independent oil and natural gas company headquartered in Pittsburgh, Pennsylvania, with offices in Atlanta, Georgia. "
• Vortex Flow Oil and Gas Tools
  "specifically designed to change the flow pattern of oil and gas products in order to virtually eliminate friction as they move through the production system. "

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• W.L. Walker Company, Inc.
  "serving the liquid measurement industry for over 70 years"
• Wampex Oilfield Trading International
  "Specializing in New and Used Oilfield Drilling, Production, and Construction Equipment "
• Warren Resources, Inc. A growing independent energy company engaged in the exploration and development of domestic onshore natural gas and oil reserves.
• Wavefront Environmental Technologies Inc.
  A service contractor that provides sound technical and environmentally responsible solutions to the challenges of site remediation and water resources needs."
• Weatherford
  "provides specialized services and equipment to the oil and gas industry worldwide."
• Welenco, Inc.
  "a full service wireline company incorporated in 1974 that provides services on wells in the water, environmental, mining, geothermal and oil industries."
• Well Master Corporation
• Wellhead Control Products, Inc.
  " a manufacturer of API wellhead equipment and provides complete field services."
• Wellogix, Inc.
  "software infrastructure tools that provide value to oil and gas companies"
• West Texas Research Group
  "provides data, analysis, planning and forecast services primarily for the energy and petrochemical industries."
• Western Falcon Inc.
  "Tubular linings"
• Western Site Technologies Inc.
  "home of Mud-loc and AGROW-loc"
• Western Well Tool, Inc
  "provides excellence in the development, manufacture and marketing of innovative products that increase drilling profitability and performance for the oil and gas industry worldwide. "
• Westport Resources Corporation
  
• WhitMar Exploration
  "focusing on the exploration for and production of oil and gas, with primary focus in the Mid-Continent and Gulf Coast regions."
• Wild Well Control, Inc.
  Worldwide Firefighting and Well Control
• Willbros Group Inc.
  one of the leading independent contractors serving the oil and gas industry, providing construction, engineering, and specialty services to private industry and government entities worldwide.
• William M. Cobb & Associates, Inc.
  Providing quality reservoir engineering, formation evaluation, and geological services to the petroleum and natural gas industry.
• Willis, Graves, and Associates
  An oil and gas consulting firm specializing in a broad range of services involving the sale of oil and gas and utility transportation, rates and regulation.
• Wilson On-Line
  A diversified company serving the drilling, production and petrochemical segments of the worldwide petroleum industry
• Winn-Marion Barber, LLP
  A manufacturer's representative firm and distributor serving the industrial and semiconductor process markets in a defined territory with measurement and control products
• Wood Mackenzie - Global Consultants
  "a division of Deutsche Bank AG, has been providing its unique range of Consultancy Services and Business Analysis Products to the Energy, Fine Chemical and Pharmaceutical industries for a quarter of a century."
• Woodhill Engineering Consultants
  

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• XTO Energy
  "one of the nation's largest independent oil and gas producers"

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