Barrel (unit) continued to use the same size barrels. In the worldwide oil industry, an oil barrel is defined as 42 US gallons, which is about litres or 35 imperial gallons. Oil companies that are listed on American stock exchanges typically report their production in terms of volume and use the units of bbl, Mbbl (one thousand barrels), or MMbbl (one million barrels) and occasionally for widest comprehensive statistics the Gbbl (or sometimes Gbl) denoting a billion. There is a conflict concerning the units for oil barrels (see ). For all other physical quantities, according to the International System of Units, the
History of the petroleum industry in Canada (oil sands and heavy oil) upgrading heavy oil at that time was a risky financial proposition. To be economic, these projects rely on substantial differences in pricing ("differentials") between light and heavy crude oil. Heavy oil is worth less than light oil; the question is, How much less? Unless upgraded oil fetched considerably more per barrel than the less attractive heavy oil, the upgrader would not make money on processing the stuff. While the Plains partnership collapsed, the idea survived. Their partners gone, SaskOil suggested reducing upgrader costs by integrating with the Consumers' Cooperative Refinery in Regina. This would eliminate duplication in facilities and infrastructure