Oil and Gas Terms Beginning with “N” — Page 2

A concept for advanced computer calculations developed by Alan Turing to mimic some of the operations of the neurons in a brain. Memory elements (neurons) are conceptually interconnected by multiple paths connected with… Read more →

The point on a string of tubulars at which there are neither tension nor compression forces present. Below the neutral point, there will be compression forces that build toward the bottom of the wellbore. Above the… Read more →

A chemical reaction between an acid and a base to form a salt and water. Neutralization is used in the manufacture of mud products, removal of acidic contaminants from muds and formation of emulsifiers in oil mud.… Read more →

A fluid prepared to counteract the corrosive effect of acids or acidic treatment fluids. Neutralizing solutions generally are used when the components to be protected cannot be adequately flushed or when there is a risk… Read more →

A neutron interaction in which the neutron is absorbed by the target nucleus, producing an isotope in an excited state. The activated isotope de-excites instantly through the emission of characteristic gamma rays.… Read more →

A device for producing high-energy neutrons by using a charged particle accelerator. Neutron generators are used in various pulsed neutron devices and some neutron porosity measurements. In a typical device, deuterium… Read more →

Phenomena involving the transfer of energy from neutrons to nuclei. The reaction rate of neutrons with matter depends on the density of neutrons, their velocity, the nuclear density and the particular interaction cross… Read more →

Normally synonymous with a neutron porosity log. However, the term is sometimes broadened to include an activation log. Read more →

What Is a Neutron Porosity Log? A neutron porosity log bombards the formation with fast neutrons from an AmBe or Cf-252 source and measures the flux of slowed (epithermal) or fully thermalised (thermal) neutrons… Read more →

A record of elemental concentrations derived from the characteristic energy levels of gamma rays emitted by a nucleus that has been activated by neutron bombardment. In the context of productionlogging, the term… Read more →

What Is a Nipple? A nipple, formally called a landing nipple, is a short, heavy-wall steel sub machined into a production tubing string during completion to provide a polished sealbore and a locking profile.… Read more →

The process of disassembling well-control or pressure-control equipment on the wellhead. Depending on the configuration of the wellhead and casing strings, it may be necessary to nipple-down and nipple-up the blowout… Read more →

The process of assembling well-control or pressure-control equipment on the wellhead. Read more →

A multiphase fluid incorporating a liquid base and gaseous nitrogen. Nitrified fluids are frequently used in stimulation treatments to enhance the performance of the treatment fluid and improve the cleanup process… Read more →

A column of high-pressure nitrogen typically applied to a tubing string in preparation for drillstem testing or perforating operations in which the reservoir formation is to be opened to the tubing string. The nitrogen… Read more →

A process whereby nitrogen gas is injected into an oil reservoir to increase the oil recovery factor. Below the minimum miscibility pressure (MMP), this is an immiscible process in which recovery is increased by oil… Read more →

(noun) A well activation technique in which nitrogen gas is injected into the tubing or annulus to lighten the hydrostatic column and reduce bottomhole pressure, enabling reservoir fluids to flow to the surface.… Read more →

The use of nitrogen gas circulated into the production conduit to displace liquids and reduce the hydrostatic pressure created by the fluid column. Nitrogen lifting is a common technique used to initiate production on a… Read more →

The injection of nitrogen into the fluid column within the production conduit to initiate fluid flow from the wellbore and production from the reservoir. Nitrogen lifting through a coiled tubing string is a common… Read more →

A high-pressure pump or compressor unit capable of delivering high-purity nitrogen gas for use in oil or gas wells. Two basic types of unit are commonly available: a nitrogen converter unit that pumps liquid nitrogen at… Read more →

A nipple that incorporates a reduced diameter internal profile that provides a positive indication of seating by preventing the tool or device to be set from passing through the nipple. In many completions, a no-go… Read more →

Anything other than desired signal. Noise includes disturbances in seismic data caused by any unwanted seismic energy, such as shot generation ground roll, surface waves, multiples, effects of weather and human… Read more →

A record of the sound measured at different positions in the borehole. Since fluid turbulence generates sound, high noise amplitudes indicate locations of greater turbulence such as leaks, channels and perforations.… Read more →

A classification of filter used in the cleaning and treatment of brines and solids-free fluids. Nominal filters trap or remove most particles of equal or larger size than the given filter specification. Read more →

Fluid flow that deviates from Darcy's law, which assumes laminar flow in the formation. Non-Darcy flow is typically observed in high-rate gas wells when the flow converging to the wellbore reaches flow velocities… Read more →

A fluid whose viscosity is not constant at all shear rates and does not behave like a Newtonian fluid. Most successful drilling fluids are non-Newtonian. Within that group are several general types and rheological… Read more →

A mud that does not conduct electricity sufficiently well to allow spontaneous potential (SP) logging or resistivity logging. Oil- and synthetic-base muds are nonconductive drilling fluids. Water muds are not in this… Read more →

A geological surface that separates younger overlying sedimentarystrata from eroded igneous or metamorphic rocks and represents a large gap in the geologic record. Read more →

Contaminants such as hydrogen sulfide [H2S], carbon dioxide [CO2], nitrogen [N2], and water, which are commonly associated with oil and gas production. Read more →

A gas described by an equation of state of the form pV = znRT, where z is the gas deviation factor dependent on pressure, temperature and gas composition. Read more →