دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a percussion tool run on a fishing string to jar downward or upward on a stuck fish to knock it free. The bumper sub body moves up and down on a mandrel.

n: A drilling tool consisting of a short stroke slip joint that allows a more constant WOB when drilling from a floating rig.

n: a sucker rod pumping unit. not commonly used. that employs cable wound around a spool. one end going into the hole. the other with a suspended counterweight. This type of unit can achieve 40- to SO-foot ( 12- to 24- metre) stroke lengths. reducing dynamic loads, rod reversals. gas locking. and power usage and can be applied to deep pump applications

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 amount of space between the travelling and standing val~ in a sucker rod pump when the pump is at the bottom of its stroke.

n: the pounds-persquare- inch (kilopascal) increase in pressure at the end of the compression stroke in an engine, about 500 pounds per square inch (3,500 kilopascals) in a diesel engine.

a diesel engine;an engine in which the air and fuel are ignited by the heat produced on the compression stroke.

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.

n: a weight applied to compensate for existing weight or force. On pumping units in oil production, counterweights are used to offset the weight of the column of sucker rods and fluid on the upstroke of the pump, and the weight of the rods on the downstroke.

n: the number of strokes a piston makes from one intake stroke to another intake stroke. Diesel engines may have either two strokes or four strokes per cycle.

n: part of a diaphragm meter that regulates the length of the diaphragm stroke;used to adjust the volumetric displacement.