• Leaded gasoline
    A fuel that contains more than 0.05 gram of lead per gallon or more than 0.005 gram of phosphorus per gallon.

  • Leaded regular gasoline
    Gasoline having an antiknock index (R+M/2) greater than or equal to 87 and less than or equal to 90 and containing more than 0.05 grams of lead or 0.005 grams of phosphorus per gallon.

  • Lease and plant fuel
    Natural gas used in well, field, and lease operations (such as gas used in drilling operations, heaters, dehydrators, and field compressors) and as fuel in natural gas processing plants.

  • Lease condensate
    A mixture consisting primarily of pentanes and heavier hydrocarbons which is recovered as a liquid from natural gas in lease separation facilities. This category excludes natural gas plant liquids, such as butane and propane, which are recovered at downstream natural gas processing plants or facilities.

  • Lease fuel
    Laydays/cancelling.Natural gas used in well, field, and lease operations, such as gas used in drilling operations, heaters, dehydrators, and field compressors.

  • Lease operations
    Any well, lease, or field operations related to the exploration for or production of natural gas prior to delivery for processing or transportation out of the field. Gas used in lease operations includes usage such as for drilling operations, heaters, dehydraters, field compressors, and net used for gas lift.

  • Lease separation facility
    A facility installed at the surface for the purpose of (a) separating gases from produced crude oil and water at the temperature and pressure conditions set by the separator and/or (b) separating gases from that portion of the produced natural gas stream that liquefies at the temperature and pressure conditions set by the separator.

  • Leasehold reserves
    Natural gas liquid reserves corresponding to the leasehold production defined above.

  • Licence
    An exploration licence permits only geological and geophysical surveying and the drilling of shallow wells; a production licence confers exclusive rights on the licensee to search and bore for and get petroleum.

  • Light Crude Oil
    Flows freely at atmospheric temperatures and has an API gravity in the high 30s and 40s.

  • Lignin
    A byproduct of cellulosic ethanol that could be used as fuel to run an ethanol plant. Lignin is a compound that gives stiffness to stems and stalks. The lignin remains after the cellulose is broken down to produce ethanol.

  • Liner
    Small diameter casing extending into the producing layer from just inside the bottom of the final string of casing cemented in a well.

  • Liquefied petroleum gases
    A group of hydrocarbon-based gases derived from crude oil refining or natural gas fractionation. They include ethane, ethylene, propane, propylene, normal butane, butylene, isobutane, and isobutylene. For convenience of transportation, these gases are liquefied through pressurization.

  • LNG
    Liquefied Natural Gas. Gas, mainly methane, liquified under pressure and low temperature.

  • Low Btu gas
    A fuel gas with a heating value between 90 and 200 Btu per cubic foot.

  • LPG
    Liquefied Petroleum Gas. Propane and butane, liquified under pressure or refrigeration. Often known as bottled gas.

  • LRG
    Liquefied refinery gases : Liquefied petroleum gases fractionated from refinery or still gases. Through compression and/or refrigeration, they are retained in the liquid state. The reported categories are ethane/ethylene, propane/propylene, normal butane/butylene, and isobutane/isobutylene. Excludes still gas.

  • Lubricity
    The "smoothness" of a fuel which affects wear-and-tear on the engine. The higher the lubricity, the easier a fuel can move through an engine, resulting in longer engine life. Lubricity is measured as "kinetic viscosity." Biodiesel is known for its lubricity.