- Axens - - Serving the refining and processing industry. Products include processes, catalysts, adsorbents and equipment, and a complete set of services optimizing performance.
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- Baker Hughes Inc. - - Services, tools and software for drilling and formation evaluation, well completion, production management and seismic data collection and interpretatio.
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- Bateman BV Engineering - - Providers of engineering, procurement, construction, maintenance, and business services globally.
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- Cal Dive International, Inc. - - Provides subsea construction, inspection, maintenance, repair and salvage services to offshore natural gas and oil industry. (Nasdaq: CDIS).
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- Chemical Tracers Inc. - - Inject chemical tracers into a single well and then produce fluids from the well to determine residual oil saturation, connate water saturation and fractional flow.
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- Ess-Ell Tool Co. Ltd. - - Hardening of metal surfaces subject to abrasion, erosion, adhesion and corrosion.
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- Everbrook Systems Ltd - - Process design and EPC contractor for water, waste water and oily wastewater treatment to the petrochemical and municipal markets.
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- Flow Petroleum Services Inc. - - Contract management of operations, human resources, reporting requirements, logistics and procurement. Providing contract personnel.
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- Fluor Corporation - - Providing engineering, procurement, construction, maintenance, and business services worldwide.
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- Fuelcare Ltd. - - Provides solutions to prevent and remediate water and microbial contamination in fuel storage systems. Based in the UK.
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- GFI-Petromark - - Provider of marking, detection, analysis and control systems for the oil industry. Site contains information about the company and molecular fuel marker technology.
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- Halliburton Company - - A major services and construction company, including well logging, well completion, and reservoir engineering.
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- IROilRigs - - Holding company for a group of companies which lease or sell drilling equipment, do contract drilling, and build small-scale refineries. Operating mainly in Indonesia, China, Uzbekistan, and Kazakhstan.
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- ISN - - IT and telecommunications consultants specialising in the oil and gas industry, offshore development and remote office locations.
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- Oilfields Supply Center - - Dubai-based company providing onshore facilities, logistical support, and engineering to Persian Gulf area and south Asia.
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- PanTerra Geoconsultants B.V. - - Geoscience consultancy group providing services to the international oil and gas industry specializing in integrated reservoir studies and consultancy. Based in the Netherlands.
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- Petraglobal - - Expertise in hydraulics, pneumatics and instrumentation. Engineer and supply gas and oil systems on a "turn-key" basis. Spare parts for Petrogas brand systems.
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- PetroAcct, L.P. - - Operational accounting, land administration and production accounting outsourcing services.
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- PT WIJAYA PURA - - Indonesian company providing complete project services including engineering, project management, construction, and procurement of supplies.
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- Puyang Zhongyuan Sanli Industry Co., Ltd. - - Manufacturer of oil drilling auxiliaries in China, offering a diverse range of well drilling, well cementing, and oil extraction chemicals. Also produces glycine.
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- Schlumberger - - Global oilfield and information services company with a major focus on energ.
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- SDV Oilfield - - Worldwide logistical support and management.
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- SMS Group - - Provides management, design and logistical services. Also custom manufactures blow out preventers and other hydraulic equipment.
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- Tembi Energy Industries - - Providing engineering, procurement and management for oil and gas projects. Based in Iran.
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