دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (under HAZWOPER) a response to an uncontrolled release of a hazardous substance that requires action by employees or other responders from outside the immediate release area. In other words, it is an emergency response if the release poses a potential safety or health hazard, and the release cannot be controlled by employees in the immediate area or by maintenance personnel.

n: refer tobreakdown voltage

n: a collective term for a variety of petroleum-based derivatives such as asphalts, coal tars, grease and wax, mastics, and asphalt mastics that are used to coat pipe.

n: the point marking the end of one stage of a process. In filtrate analysis, the endpoint is the point at which a particular result is achieved through titration.

n: a multi-bladed propeller usually installed behind an engines radiator, which moves air over an engine. It helps cool the engine and equalizes the temperature of the air as it flows over the engine, thus preventing hot spots. Engine power usually operates the fan, although some fans have auxiliary electric motors that power them when the engine is stopped.

n: the heat content of fuel. A thermodynamic property, it is the sum of the internal energy of a body and the product of its pressure multiplied by its volume.

n: a neutron having an energy level of 0.02 to 100 electron volts.

n pi: in crane operations, multiple-leg slings of wire rope and fittings that equally distribute the load among the slings.

n: the condition in which the speed of reactant inverting into resultant and the speed of the resultant inverting into reactant come to equality

n: (ECD) the increase in bottomhole pressure expressed as an increase in pressure that occurs only when mud is being circulated. Because of friction in the annulus as the mud is pumped, bottomhole pressure is slightly, but significantly, higher than when the mud is not being pumped. ECD is calculated by dividing the annular pressure loss by 0.052, dividing that by true vertical depth, and adding the result to the mud weight Also called circulating density, mudweight equivalent

n: The effective drilling-fluid weight at any point in the annulus of the well bore during fluid circulation.ECD includes drilling-fluid density, cuttings in the annulus, and annular pressure loss.

the effective fluid density that the formation sees when the friction pressure on the fluids returning to surface is added to the fluid density.