PETE311_06A_Class09_(Maggard)

PETE311_06A_Class09_(Maggard) - Conversion Factors for...

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Conversion Factors for Oilfield Units
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Need for Unit Conversions • Petroleum Engineers must be able to work with various unit systems – International scope of industry • Unit systems used varies geographically • Team members may not all be located in same geographical location • Joint ventures between companies – Particular units may be required at your location • Legislated units for reporting and regulatory compliance • Company protocol
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Oilfield Units • Oilfield units are non-coherent – Newton’s 2nd Law (F=ma) • SI: Force (Newton) is a derived unit to make equation coherent • USCS: Mass (slugs) is a derived unit to make equation coherent • AES, Oilfield Units: A unit conversion constant required (F=ma/g c ) – Darcy’s Law • Darcy units: Permeability is a derived unit to make equation coherent • SI: coherent (permeability unit is m 2 ) • Oilfield Units: A unit conversion constant is required – The constant may include geometry terms (integrated form) – For gas flow, the constant may include standard temperature and pressure, even for Darcy and SI units ds d Φ μ k C A q v s = =
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Learning Objectives • Deriving unit conversion constants –G i v e n • A physical relationship expressed as an equation, using coherent units or with a correct conversion constant supplied •a n d appropriate unit conversion factors between unit systems –F i n d • The required unit conversion constant (including its units) to express the equation in a different unit system
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PETE311_06A_Class09_(Maggard) - Conversion Factors for...

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