Oil and gas terminology · MLC-0103

Oil and gas terms: N (86)

• NThe saturation exponent in Archie's equation, which relates formation resistivity to water saturation. It...
• NACEAn acronym for the National Association of Corrosion Engineers, now known as the Association for Materials...
• Naphthene-base crude oilA type of crude oil characterized by a high proportion of naphthenes (cycloparaffins) and a relatively low...
• Naphthenic hydrocarbonA type of cyclic saturated hydrocarbon, also known as cycloalkane, found in crude oil and used as a base oil...
• Narrow-azimuth seismic dataSeismic data acquired with a limited range of source-to-receiver azimuths, resulting in a restricted...
• Native clayClay minerals naturally present in the formation being drilled, which can become incorporated into the...
• Native-solids mudA drilling fluid where the primary solid content consists of drilled formation cuttings rather than...
• Native-state coreA core sample that has been preserved as closely as possible to its original reservoir conditions, including...
• Natural completionA well completion method where the reservoir has sufficient pressure and permeability to produce hydrocarbons...
• Natural fractureA pre-existing break or discontinuity in a rock formation that formed due to tectonic stresses or other...
• Natural frequencyThe frequency at which a system oscillates when disturbed from its equilibrium position and then allowed to...
• Natural gamma ray spectroscopyA well logging technique that measures the energy spectrum of natural gamma rays emitted by radioactive...
• Natural gasA naturally occurring hydrocarbon gas mixture consisting primarily of methane, often found in association...
• Natural gas liquidsA mixture of hydrocarbons, heavier than natural gas and lighter than crude oil, that are recovered from a...
• Natural gasolineA mixture of heavier hydrocarbons, primarily pentanes and heavier, that are recovered from natural gas during...
• Natural remanent magnetismThe permanent magnetization acquired by rocks and sediments from the Earth's magnetic field at the time of...
• Naturally flowing wellA well that produces hydrocarbons to the surface without the aid of artificial lift mechanisms, driven solely...
• Naturally occurring radioactive materials (NORM)Radioactive elements, such as radium, thorium, and uranium, that are present in the Earth's crust and can be...
• Nautical mileA unit of length used for navigation, precisely defined as 1,852 meters. This unit is derived from the...
• Near-surface correctionA correction applied to seismic data to compensate for travel time distortions caused by the low-velocity...
• Neat cementA basic cement slurry composed solely of Portland cement and water, without any additives. This mixture is...
• Needle valveA type of valve characterized by a small port and a slender, tapered plunger that precisely fits into the...
• NeriticRelating to the shallow marine environment extending from the low-tide line to the edge of the continental...
• NestA configuration of seismic receivers or sources arranged in a compact, often overlapping, pattern to achieve...
• Nested fractal structuresGeometrical patterns within a rock formation that repeat themselves at progressively smaller or larger...
• Net gas productionThe volume of natural gas produced from a well or field that is available for sale or use after accounting...
• Net oil productionThe volume of crude oil produced from a well or field after deducting any oil used for lease operations...
• Net profits interestA share of the net profits from an oil and gas property, after all operating and development costs have been...
• Net revenue interestThe percentage of revenue an owner receives from the sale of oil and gas production, after all royalties...
• Neural networkA computational model inspired by the structure and function of biological neural systems, capable of...
• Neural networks, see Neural network
• Neutral pointThe depth in a drill string or tubing string where the axial load transitions from compression above to...
• NeutralizationA chemical reaction in which an acid and a base react to form a salt and water, adjusting the pH of a...
• NeutralizeTo adjust the pH of a drilling fluid or effluent to a value closer to 7, reducing its acidity or alkalinity...
• Neutralizing solutionA chemical solution used to adjust the pH of a fluid, often to bring it closer to a neutral value of 7. In...
• Neutron activation logA nuclear logging technique that bombards formation elements with high-energy neutrons, causing them to...
• Neutron captureThe process where a neutron is absorbed by an atomic nucleus, leading to the emission of gamma rays. In well...
• Neutron generatorA downhole tool component that produces high-energy neutrons for porosity and mineralogy logging without...
• Neutron interactionsThe processes by which neutrons emitted from a logging tool lose energy or are absorbed as they pass through...
• Neutron logA porosity logging tool that measures the hydrogen index of the formation, which is directly related to its...
• Neutron porosityThe porosity derived from a neutron log, which is a measure of the hydrogen content in the formation. In...
• Newtonian fluidA fluid whose viscosity remains constant regardless of the shear rate applied. The relationship between shear...
• NGLNatural gas liquids, which are hydrocarbons that are gaseous at reservoir conditions but condense into...
• NippleA short piece of pipe with male threads on both ends, used to connect two other fittings with female threads...
• Nipple downTo dismantle and remove the blowout preventer (BOP) stack and other wellhead equipment from the well after...
• Nipple upTo assemble and install pressure control equipment, such as the blowout preventer (BOP) stack, onto the...
• Nitrified fluidA treatment fluid, such as fracturing fluid or acid, that has nitrogen gas dissolved or dispersed within it...
• Nitrogen cushionA volume of high-pressure nitrogen gas placed in the tubing or drill string above a column of liquid during...
• Nitrogen injectionAn enhanced oil recovery method involving the injection of nitrogen gas into a reservoir to displace oil...
• Nitrogen kickoffA well intervention technique that uses injected nitrogen gas to reduce the hydrostatic pressure in the...
• Nitrogen liftAn artificial lift method where nitrogen gas is injected into the production tubing to lighten the fluid...
• Nitrogen liftingA well intervention technique that involves injecting nitrogen gas into the wellbore to reduce the...
• Nitrogen unitA piece of surface equipment that generates and pumps high-pressure gaseous nitrogen for use in well...
• NMOThe change in reflection travel time due to the varying distance between a source and receiver for a flat...
• NMRNuclear magnetic resonance, a logging measurement that detects the magnetic properties of hydrogen nuclei in...
• NODAL analysisA systems analysis method used to evaluate the performance of a complete oil or gas production system from...
• No-go landing nippleA type of landing nipple with an internal shoulder that provides a physical stop to prevent a flow-control...
• NoiseAny unwanted energy recorded during a seismic survey that is not a primary reflection from the subsurface...
• Noise logA passive acoustic measurement that records downhole sounds to identify fluid or gas movement in or around a...
• Nominal filterA filter rated to capture a certain percentage of particles at or above a specified micron size, but not...
• Nonconductive drilling fluidA drilling fluid, such as an oil-based or synthetic-based mud, that does not conduct electricity due to its...
• NonconformityAn unconformity where younger sedimentary rocks directly overlie older, eroded igneous or metamorphic rocks...
• non-Darcy flowFluid movement through a porous medium where the pressure drop is not directly proportional to the flow rate...
• Nondestructive examination (NDE)A group of inspection techniques used to evaluate the integrity, properties, and condition of materials...
• Nondipole fieldThe component of the Earth's magnetic field that cannot be described by a simple dipole (bar magnet) located...
• Nonhydrocarbon contaminantsSubstances found in natural gas or crude oil that are not hydrocarbons and can negatively impact processing...
• Nonideal gasA gas whose behavior deviates significantly from the ideal gas law, particularly at high pressures and low...
• non-Newtonian fluidA fluid whose viscosity changes with the applied shear rate, meaning its flow behavior is not directly...
• Nonparticipating royaltyA royalty interest that does not grant the owner any rights to participate in the execution of oil and gas...
• Nonparticipating royalty interestA fractional share of gross production of oil and gas, free of the costs of exploration, development, and...
• Nonrising stemA valve design where the stem, which connects the handwheel to the valve's closure element, rotates to open...
• NormalA type of resistivity log that measures the potential difference between two electrodes, with a fixed...
• Normal faultA dip-slip fault where the hanging wall moves downward relative to the footwall, caused by tensional forces...
• Normal incidenceThe condition where a seismic wave strikes an interface between two different rock layers perpendicularly...
• Normal modeThe standard operating condition or configuration for a logging tool, where it performs its primary...
• Normal moveoutThe time difference in a seismic reflection arrival between a zero-offset trace and an offset trace, caused...
• Normal pressureThe hydrostatic pressure exerted by a column of formation water from the surface to a given depth. This...
• NormalityA measure of concentration in chemistry, defined as the number of gram equivalent weights of solute per liter...
• Normal-moveout correctionA seismic data processing step that adjusts the arrival times of reflection events on a common midpoint (CMP)...
• NPDESThe National Pollutant Discharge Elimination System, a program under the Clean Water Act that regulates the...
• NRMNatural remanent magnetism, the permanent magnetization acquired by rocks and sediments from the Earth's...
• Nuclear fluid densimeterA downhole instrument that measures the density of fluids in a wellbore using nuclear radiation. It typically...
• Nuclear magnetic resonanceA logging technique that measures the magnetic properties of hydrogen nuclei in reservoir fluids to determine...
• Nuclear magnetic resonance measurementA well logging technique that measures the magnetic properties of hydrogen nuclei (protons) in formation...
• Numerical methodsMathematical techniques that use approximations to solve complex problems that lack analytical solutions...
• Numerical modelA computational representation of a physical system, such as a petroleum reservoir, that uses mathematical...
• Numerical reservoir simulationThe application of computational methods to predict the behavior of fluids within a petroleum reservoir over...

86 of 4,499 terms in Oil and gas terminology (MLC-0103). Request the full dataset.