دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: compression of air or gas that exists when no heat is transferred between the air or gas and surrounding bodies (such as the cylinders and pistons in a compressor). It is characterised by an increase in temperature during compression and a decrease in temperature during expansion.

a surface piston driven pumping unit, similar to a beam lift unit.

n: (bbl) 1. a measure of volume for petroleum products in die United States. {A)e barrel is the equivalent of 42 US gallons or 0.15899 cubic meters (9,702 cubic inches). One cubic metre equals 6.2897 barrels. 2. the cylindrical part of a sucker rod pimp in whid1 the piston like plunger moves up and down. Operating as a piston inside a cylinder, the plunger and ~I create pressure energy to lift well fluid to the surface.

an oilfield measurement barrel is 42 US gallons or 5.615 ft3 or 6.28 barrels = 1 meters3. Note that reservoir barrels undergo shrinkage by the reservoir volume factor as gas escapes. Stock tank barrels are measured after gas escapes.

n: the percentage of gases that escape past the piston rings from the combustion chamber into the crankcase of an engine.

n: (BOC) the positioning of the piston at the lowest point possible in the cylinder of an engine;often marked on the engine flywheel.

n: A special liquid pressure-sensing piston valve installed in casing guide shoe or casing float collar.

n: in a reciprocating compressor, the volume between the top of the piston and the cylinder head with the piston at the top of its stroke.

n: the ratio between the pressure in the hole and the operating-piston pressure needed to close the rams of a blowout preventer.

n: The ratio between subsurface pressure and working hydraulic pressure which closing BOP rams requires.

the ratio between the pressure in the hole and the operating-piston pressure needed to close the rams on a given BOP design against a particular well head pressure.

n: (Cl) an ignition method used in diesel engines by which the air in the cylinder is compressed to such a degree by the piston that ignition occurs upon the injection of fuel. About a I-pound (7- kilopascal) rise in pressure causes a ZO-F (] O-C) increase in temperature.

n: the ratio of the volume remaining in a compressor cylinder at the end of a compression stroke to the volume displaced by one stroke of the piston. Usually expressed as a percentage.