However, in the resource accounts and other comparisons where oil equivalents are used, a common and constant conversion factor is used for all fields and discoveries. The properties of oil, gas and NGL vary from field to field and over time. When performing conversions, the Norwegian Petroleum Directorate uses a volumetric conversion of NGL to liquid and an energy-based (but not exact) conversion factor for gas, based on typical properties on the Norwegian shelf. The most common method is using standard cubic metres of oil equivalents (abbreviated as Sm 3 o.e.). To add up amounts of different petroleum products (oil, gas, NGL and condensate), they must first be converted to a uniform quantity and unit. The standard conditions are 15 ☌ and normal atmospheric pressure (1013.25 hPa). This will estimate the electricity consumed by each. Oil and gas volumes are often stated in standard cubic metres (Sm 3), and for precise indication of volumes, the temperature and pressure at which they apply must also be stated. Heres an electricity consumption calculator which can help you calculate energy usage in your home. Assumptions regarding energy content per cubic metre gas and weight per volume unit NGL are examples of this. When performing conversions, for example from volume to energy content, there is no exact conversion factor and you must know/make assumptions about the properties of the substance you are converting. ![]() ![]() ![]() In Norway, we generally use the metric system (International System of Units), but older American (British) units are also frequently used in the petroleum industry. Different units can be used for the different quantities, for example cubic metres and barrels, both of which express volume. Quantities can be expressed by mass (weight), volume and energy content. Volumes of petroleum (oil, condensate, NGL and gas) can be measured and quantified in multiple ways.
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