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• Object Reservoir "a technology-based professional services organization that specializes in Dynamic Reservoir Characterization™. Object Reservoir helps oil and gas companies maximize ROI "
• Oil & Gas Information Systems Inc. "chartered to provide cost effective accounting solutions for the domestic oil and gas industry. As the system was enhanced, an international accounting application was added opening up worldwide markets in addition to the domestic markets. Over the years, many other program enhancing applications have been added. "
• Oildex.Com "Oildex Connect™ is a workflow solution and information exchange for budget and contract approval, ordering, invoice processing, and revenue reporting -- activities that consume most of the resources within oil company accounting and lease management departments. "
• Oilfield Data Manager (ODM) "designed to allow the geoscientist or engineer to integrate, interpret and display a wide range of reservoir data. Using a highly visual interface, ODM allows well logs to be interactively interpreted with results immediately correlated and remapped."
• Oilware, Inc. "a provider of data conversion software products, data management consulting, and data conversion services. Oilware specializes in DLIS, LIS, LAS, ASCII (of all types), BIT, POSC Exchange Format (PEF), and Geoshare data interchange and conversion."
• OmniCon "an accurate, powerful, and customizable Metric conversion software program for Windows 98/ME, Windows NT/2000"
• OpenSpirit "..changes the way oil and gas companies use information and how software developers build applications....a platform independent plug-and-play framework that allows best-in-class applications from a variety of software vendors to readily interoperate."
• OSI Software, Inc. "a leading global supplier of software products for managing information in the process manufacturing industries. "
• Overload Services Inc. "a full-featured software and engineering support company with more than 50 years of combined accumulated experience in the Instrumentation Design, Documentation and Maintenance discipline...based in the heart of the petrochemical industry "

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• P2 Energy Solutions "a leading enterprise application solution and consulting services provider focused on delivering solutions that meet the financial, accounting, and property management needs of exploration and production companies worldwide."
• Palisade World's leading developer of software for risk and decision analysis
• Paradigm Geophysical "the Geoscience Knowledge Company"
• PathTracker "Directional and Horizontal Drilling survey Calculation Program."
• PayZone "An interactive drilling simulator for training and operations optimization."
• Peloton Well Data Software ""full well lifecycle data management solution for Drilling, Operations and Construction/Reclamations.""
• Performance Sciences, Inc. (PSI)  "principle activities of PSI include providing production data analysis software, consulting, and training services to the petroleum industry."
• Petris "provides solutions for energy clients leveraging expertise in data management, application hosting and geospatial information systems. Solutions include PetrisWINDS Enterprise (data management), Recall (well bore data management and applications suite), and Maurer Software (world-class drilling, completion and analysis software.)"
• Petro-Soft Systems Ltd. "a Canadian company that develops innovative Reserves Management software. Our Phoenix Reserves Management Suite provides the Oil & Gas producer with a complete corporate view of their assets. "
• Petroleum Experts "develops the Integrated Production Engineering Toolkit IPM using the software GAP, PROSPER, MBAL, PVTP, REVEAL and OpenServer. The IPM suite of tools have become the standard field optimisation and prediction toolkit for modelling the reservoir tanks, all the wells and the surface gathering system within many of the major operators worldwide. "
• Petroleum Software Technologies formed ...by...geoscience professionals to develop fast and easy-to-use tools that would revolutionize the way digital log data are viewed and used.
• Petrolink Services "excels in the rapid transmission of wellsite data from any land or offshore site to any office in the world. "
• Petrospec Technologies, Inc.
  "provided the petroleum industry with innovative PC software. Petrospec currently provides cost- effective software and services for geopressure analysis from petrophysical and seismic data, mapping, map and log digitizing, and seismic data analysis."
• Petrosys "a leading supplier of interactive software for geologic and geophysical interpretation. Our customers range from small independents to large multinational oil companies, universities, consultants and research groups. We develop software for both Unix and Windows and have sales and support offices around the world including USA, Canada, Europe, MiddleEast, South America and Australia/Pacific regions."
• Petroway, Inc. "specializing in engineering software and books for the international petroleum industry." Automate for Windows^TM, WinBOAST, and Modern Well Test Analysis
• PFR Engineering Systems, Inc. "software is used in the Petroleum, Petrochemical and Power industries around the world to evaluate thermal equipment such as fired heaters, boilers, heat exchangers and heat recovery systems."
• PHH Petroleum Consultants "an international petroleum consulting company and software developer located in Calgary, Canada.... PHH offers a full range of services relating to reservoir performance analysis and optimization using numerical simulation."
• Platte River Associates, Inc. "developing basin modelling software since 1985"
• Process Ace Software "Palm OS Software for Engineers. Applications include steam tables, pump calculations, steam turbine calculations and gas fired heater calculations."
• ProData Online dedicated to providing a data collection system that provides accurate and up-to-the-minute production data “from the Wellsite to the Website” while providing our clients with the best in customer support and training.
• Prode Software "ideas that work"
• Public Petroleum Data Model Association (PPDMA) "the business driven standard"

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• RapidView "developing and providing unique inspection solutions to the nuclear, petrochemical, industrial and municipal sewer industries. RapidView has designed and marketed the first practical sonar inspection system or sonar profiling for use in liquid filled pipelines. "
• Rockmate Technical Service "Providing software solutions to the extractive industries since 1985." dXmCubed is a ground modelling system; a free fully working demo copy  of the software is available.
• Rockware Inc., Geological Software "the foremost developer and distributor of inexpensive earth science software applications"
• Roughneck Systems, Inc. "Office Accounting Software for Oil and Gas Operators"
• Roxar ASA "a leading reservoir technology company providing innovative products and services to the upstream oil and gas industry"
• RSI "Dynamic Simulation and Advanced Process Control Technologies"
• Russian Petroleum Consultants Corp. "offers petroleum reservoir management, integrated reservoir studies, field operations, and software consulting services. "

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