دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1.the injection of air into a reservoir in a pressure maintenance or an in situ combustion project. 2. the injection of fuel into the combustion chamber of a diesel engine by means of a jet of compressed air.

n: 1. a solid cellular residue produced from the dry distillation of certain carbonceous materials that contains carbon as its principal constituent 2. a residue of heavier hydrocarbons formed by thermal cracking and distillation and deposited in the reservoir during in situ combustion. This residue catches fire and becomes the fuel for continued combustion.

a generally insoluble hydrocarbon that has been oxidized to the point of a solid, often hard mass.

n: the use of air as the only injected heat carrier during an in situ combustion operation. See in situ combustion. The main difficulty with dry combustion is that about 80 percent of the injected heat is lost to the formation. Compare wet combus- tion.

n: a common type of in situ combustion in which the combustion front moves in the same direction as the injected air. Burning is started at an injection well and moves toward production wells as air is continuously injected into the injection well. Compare reverse combustion.

n: in improved recovery, the amount of coke available for in situ combustion. measured in pounds per cubic foot of burned area. Coke is formed by thermal cracking and distillation in the combustion zone. The amount of available coke depends on the composition of the reservoir cn* oil.

n: a method of improved recovery in which heat is generated within the reservoir by injecting air and burning a portion of the oil in place. The heat of initial combustion cracks the crude hydrocarbons, vaporises the lighter hydrocarbons, and deposits the heavier hydrocarbons as coke. As the fire moves from the injection well in the direction of producing wells, it bums the deposited coke, releases hot combustion gases, and converts connate water into steam. The vaporised hydrocarbons and the steam move ahead of the combustion zone, condensing into liquids as they cool and moving oil by miscible displacement and hot waterflooding. Combustion gases provide additional gas drive. Heat lowers the viscosity of the oil, causing it to flow more freely. This method is used to recover heavy, viscous oil. Also called fire flooding.

n: a type of in situ combustion in which the combustion front moves counter to the direction of the injected air. Air is injected into a production well and burning is started near the well. When the combustion zone has advanced a short distance from the well. air injection is stopped from the production well and started from an adjacent injection well. The fire advances toward the injection well, but the oil moves toward the production well. This method may be used with very viscous oils. Compare forward combustion.

n: (TEOR) a method of increasing well productivity and recoverable oil by using heat, e.g., steam injection (the huff n puff method),steam flood, or in situ combustion.

n: a type of improved recovery in which heat is introduced into a reservoir to lower the viscosity of heavy oils and to facilitate their flow into producing wells. The pay zone may be heated by injecting steam (steam drive) or by injecting air and burning a portion of the oil in place (in situ combustion). See cyclic steam injection, in situ combustion, steam drive.

an enhanced oil recovery process that uses heat to reduce oil viscosity.