Oil and gas terminology · MLC-0103

Oil and gas terms: M (266)

• MThe cementation exponent in Archie's equation, which describes the relationship between formation...
• MaAn abbreviation for mega-annum, representing one million years. This unit is used in geology to express vast...
• Machine learning (ml)A subset of artificial intelligence in which algorithms are trained on data to find patterns, make...
• Machine learning operations (ml ops)A set of practices for managing the complete lifecycle of a machine learning model, combining principles from...
• MaficDescribing an igneous rock, magma, or mineral that is rich in magnesium and iron, giving it a...
• MagmaMolten rock material generated within the Earth's crust or upper mantle, containing dissolved gases and...
• Magnesium testA chemical titration procedure performed on drilling fluid filtrate to determine the concentration of...
• Magnetic constantA fundamental physical constant, the permeability of free space, symbol mu zero, which links magnetic flux...
• Magnetic fieldA region around a magnetic material or a moving electric charge where a magnetic force is exerted on other...
• Magnetic mudA drilling fluid that carries enough magnetic material, such as magnetite, iron-rich weighting agents or...
• Magnetic particle inspection (MPI)A non-destructive testing method used to detect surface and near-surface discontinuities in ferromagnetic...
• Magnetic permeabilityA measure of a material's ability to support the formation of a magnetic field within itself. It describes...
• Magnetic resonanceA logging technique that measures the nuclear magnetic resonance (NMR) properties of fluids within reservoir...
• Magnetic reversal sequenceA chronological record of changes in the Earth's magnetic field polarity, preserved in rocks as they form...
• Magnetic toolfaceThe angle of a directional tool's toolface, measured clockwise from magnetic north in a plane cut across the...
• Magnetic total fieldThe scalar magnitude of the Earth's magnetic field vector at a given point. This measurement includes...
• Magnetic-flux leakageA non-destructive testing technique used in production logging to detect defects in ferromagnetic materials...
• MagneticsA geophysical exploration method that measures variations in the Earth's magnetic field to infer subsurface...
• MagnetometerAn instrument that measures the strength, and for some types the direction, of a magnetic field. Proton...
• Magnetotelluric methodA passive electromagnetic geophysical technique that measures naturally occurring variations in the Earth's...
• Main magnetic fieldThe dominant part of the Earth's magnetic field, generated by convection currents in the liquid outer core...
• Make a connectionTo add a new stand of drill pipe or casing to the drill string during drilling operations. This involves...
• Make holeTo deepen a wellbore by drilling new rock at the bottom of the hole. This process involves rotating the drill...
• Make upTo connect and tighten threaded tubular components, such as drill pipe, drill collars, or casing sections, to...
• Makeup catheadA spool-shaped device mounted on the drawworks shaft, used to tighten threaded connections on the rig floor...
• Makeup gasAdditional gas introduced into a system or process to maintain a desired pressure, volume, or composition...
• Makeup tongsLarge, wrench-like tools used on the rig floor to grip and rotate drill pipe, casing, or other tubulars to...
• Make-up waterWater added to a drilling fluid system to compensate for losses due to evaporation, filtration, or removal of...
• Managed pressure drillingAn adaptive drilling process that precisely controls the annular pressure profile of the whole wellbore...
• MandrelA cylindrical component that forms part of a downhole tool or completion assembly. It provides structural...
• ManifoldA piping system that combines or distributes fluid flow from multiple lines into a single line, or vice...
• MantleThe thick layer of solid rock between the Earth's crust and outer core, comprising approximately 84% of the...
• MapA graphical representation of subsurface geological features, such as structural contours, isopachs, or...
• Marginal wellA well that produces so little oil or gas that revenue barely covers its operating cost, which makes it very...
• MarineRelating to the ocean or sea, describing environments of deposition, sedimentary rocks, or fossils...
• Marine drilling riserA large-diameter pipe that connects the subsea blowout preventer (BOP) stack on the seabed to the drilling...
• Marine flooding surfaceA surface that separates older, underlying strata from younger, overlying strata, representing an abrupt...
• Marker bedA thin, distinctive rock layer that is recognizable over a wide area and therefore serves for correlation...
• Marker jointA section of tubing or casing that is distinctively marked or measured to indicate a specific depth or...
• Marketing agreementA contract between two or more parties, such as an operator and non-operating working interest owners, that...
• MarlA sedimentary rock composed of a mixture of clay and calcium carbonate, typically containing 35% to 65%...
• MarshA type of wetland characterized by herbaceous vegetation, such as grasses, reeds, and sedges, that is...
• Marsh funnelA simple, cone-shaped device used to measure the relative viscosity of drilling fluid by timing how long it...
• Marsh funnel viscosityA measure of the relative viscosity of a drilling fluid, determined by the time it takes for one quart (946...
• Mass balanceAn accounting of all materials entering and leaving the circulating drilling fluid system, based on the...
• MassifA large, rigid block of crustal rock that has moved as a single unit, bounded by faults or flexures. It...
• MastA structural component of a drilling rig that supports the crown block, traveling block, and drill string. It...
• Mast unitA self-erecting, portable derrick structure used on workover rigs and smaller drilling rigs to support the...
• Master valveA large, high-pressure valve located on the Christmas tree that controls all flow from the well. It is the...
• Material balanceAn engineering principle that applies the conservation of mass to a reservoir system, equating the initial...
• Material balance equationA conservation relation used in mud engineering that equates the total mass, or volume, of a blended fluid to...
• Material Safety Data SheetA document providing detailed information about the potential hazards of a chemical product, including its...
• MatrixThe fine-grained material that fills the spaces between larger grains or clasts in a sedimentary rock, or the...
• Matrix acidizingA well stimulation technique that involves injecting acid into the reservoir rock at pressures below the...
• Matrix stimulationA well treatment designed to improve the flow of hydrocarbons from the reservoir into the wellbore by...
• MaturationThe natural process by which organic matter within source rocks is transformed into hydrocarbons (oil and...
• Maximum flooding surfaceA surface within a sedimentary sequence that represents the point of greatest marine transgression and the...
• Maximum recorded temperatureThe highest temperature measured by a downhole logging tool during its descent or ascent in a wellbore. This...
• Maximum treating pressureThe highest pressure that can be applied to a wellbore during a stimulation or treatment operation without...
• Maximum working pressure (MWP)The highest internal pressure that a piece of equipment, such as a vessel, pipe, or valve, is designed to...
• Maxwell's equationsA set of four partial differential equations that describe the behavior of electric and magnetic fields and...
• MBT testA laboratory procedure, also known as the methylene blue test, that determines the cation exchange capacity...
• MDMeasured depth, the total length of the wellbore from the surface reference point along its actual path to...
• MeanThe arithmetic average of a set of numerical data, calculated by summing all values and dividing by the count...
• Measure pointThe specific physical location on a logging tool where a sensor makes its measurement. Each sensor on a tool...
• Measured depthThe total length of the wellbore from the surface reference point along its actual path to any given point...
• Measurement after drillingThe process of acquiring formation evaluation data using logging tools conveyed into the wellbore after the...
• Measurement errorThe difference between a measured value from a logging tool and the true physical property of the formation...
• Measurement rangeThe span of values that a logging tool or sensor can accurately measure, from its minimum to its maximum...
• Measurements-while-drillingA system of downhole sensors and telemetry that provides real-time data on wellbore trajectory and drilling...
• Measuring tankA calibrated vessel used to determine the volume of produced liquids, such as oil or water, over a specific...
• Mechanical diversionThe use of solid, physical objects to block off perforations or existing fractures to divert stimulation...
• Mechanical jarA downhole tool designed to deliver an impact force to free stuck objects or to activate other tools in the...
• Mechanical skinDamage to the formation around the wellbore caused by drilling, completion, or perforating operations, which...
• Mechanical specific energyThe amount of mechanical work required to excavate a unit volume of rock during drilling. It is calculated...
• Mechanical stickingA condition where the drill string becomes immobilized in the wellbore due to physical obstruction rather...
• MedianThe central value in a sorted list of numerical data, which divides the set into an upper and a lower half of...
• MediumThe fluid phase, either liquid or gas, that carries suspended solids or dissolved components within a...
• Medium inductionA measurement of formation conductivity or resistivity using an induction logging tool with a specific depth...
• Membrane potentialAn electrical potential difference that develops across a shale membrane when two solutions of different...
• Memory gaugeA downhole electronic instrument that records pressure and temperature data over time and stores it in...
• MeniscusThe curved surface of a liquid in a container, formed by the interplay of surface tension and the adhesion or...
• Mercury displacement methodA laboratory technique used to determine the bulk volume of a core sample by measuring the volume of mercury...
• MetagenesisThe last stage of thermal evolution of organic matter in source rocks, following catagenesis, reached at...
• Metal gainAn increase in the apparent amount of metal in a casing or tubing joint shown by an electromagnetic or...
• Metal lossA reduction in the wall thickness of a tubular, such as casing or tubing, typically caused by corrosion or...
• Metal-to-metal sealA sealing mechanism that relies on the direct contact and elastic or plastic deformation of two precisely...
• MetamorphicDescribing rocks that have undergone a transformation in their mineralogy, texture, or chemical composition...
• MetamorphismThe process by which rocks are transformed by heat, pressure, and chemically active fluids, resulting in...
• MeterAn instrument that measures and records the volume or flow rate of fluids, such as oil, gas, or water...
• Meter calibrationThe process of adjusting a flow meter to provide accurate measurements against a known standard. This...
• Meter capacityThe maximum and minimum flow rates that a particular meter can accurately measure without damage or loss of...
• Meter differenceThe discrepancy between the volume of fluid measured by a primary meter and a secondary or check meter, or...
• Meter factorA dimensionless multiplier applied to a meter's raw reading to correct for inaccuracies and provide a true...
• Meter slippageThe phenomenon in positive displacement meters where a small amount of fluid bypasses the measuring elements...
• MethaneThe simplest hydrocarbon, a colorless and odorless gas with the chemical formula CH4, and the primary...
• Methane hydrateA solid, ice-like compound formed when methane gas is trapped within a cage of water molecules under specific...
• Methyl orangeA pH indicator dye used in analytical chemistry, particularly for titrations involving acids and bases. It...
• Methyl orange alkalinityA measure of the total alkalinity in a drilling fluid, determined by titration with a strong acid to the...
• Methylene blue dyeA cationic dye used in the methylene blue capacity (MBC) test to determine the cation exchange capacity of...
• Methylene blue testA standard laboratory procedure that measures the cation exchange capacity (CEC) of active clays and drilled...
• Methylglucoside drilling fluidA type of water-based drilling fluid that incorporates methylglucoside as a shale inhibitor and fluid loss...
• MfThe methyl orange alkalinity of a mud filtrate, found by titrating a filtrate sample with 0.02 N sulfuric...
• MicaA group of sheet silicate minerals characterized by their perfect basal cleavage, allowing them to split into...
• Micellar-polymer floodingA chemical enhanced oil recovery method that involves injecting a slug of a micellar solution, followed by a...
• MicelleA spherical or cylindrical aggregate of surfactant molecules dispersed in a liquid, where the hydrophilic...
• MicriteA microcrystalline calcite mud that forms the matrix or cement in many limestones, consisting of carbonate...
• MicroannulusA small, often microscopic, gap that forms between the cement sheath and the casing or formation wall in a...
• Microbial enhanced oil recoveryAn enhanced oil recovery technique that involves introducing microorganisms or their metabolic products into...
• Microcylindrical logA specialized well log that measures the electrical resistivity of the flushed zone, the invaded portion of a...
• MicroemulsionA thermodynamically stable, optically isotropic dispersion of two immiscible liquids, such as oil and water...
• MicrolaterologA focused microresistivity log designed to measure the resistivity of the flushed zone, which is the portion...
• MicrologA shallow-investigating resistivity log that uses a pad pressed against the borehole wall to measure the...
• MicropaleontologyThe study of microscopic fossils, such as foraminifera, ostracods, and pollen, which are too small to be...
• MicroporosityThe fraction of a rock's volume composed of extremely small, sub-resolution pores, such as those found within...
• MicroresistivityThe measurement of electrical resistivity in the immediate vicinity of the borehole wall, typically within...
• Microseismic monitoringA technique used to detect and locate small seismic events, or microseisms, that occur within a reservoir...
• Microspherical logA type of microresistivity log that uses a spherically focused current to measure the resistivity of the...
• Middle-time transient dataPressure and flow rate data collected during a well test after wellbore storage effects have ended but before...
• Midoceanic ridgeAn underwater mountain range formed by plate tectonics at a divergent boundary, where new oceanic crust is...
• MidpointThe point on the surface or in the subsurface located halfway between a seismic source and a receiver. In...
• MidrangeA statistical measure representing the average of the maximum and minimum values in a dataset. It provides a...
• MigrateTo move hydrocarbons, either oil or gas, from their source rock to a reservoir rock. Primary migration...
• MigrationThe movement of hydrocarbons (oil and natural gas) from their source rock to a reservoir rock. Primary...
• Milankovitch cyclesLong-term cyclical variations in the Earth's orbital parameters, including eccentricity, axial tilt...
• Milk emulsion mudA type of oil-in-water emulsion drilling fluid where a small amount of oil is dispersed in a continuous water...
• MillA downhole tool with a hardened, abrasive cutting face used for grinding or cutting metal, cement, or rock in...
• Mill outTo remove an obstruction or a section of downhole equipment by grinding it into small pieces using a...
• Mill shoeA heavy-duty, abrasive bottom-hole assembly component used to grind up junk, cement, or other obstructions in...
• Milligrams per kilogramA unit of concentration representing the mass of a substance in milligrams per kilogram of the total mixture...
• Milligrams per literA unit of mass concentration equal to one milligram of solute per litre of solution. For dilute aqueous...
• MillingThe process of grinding or cutting away material in the wellbore using a downhole mill. This operation is...
• Million standard cubic feetA unit of volume used to quantify natural gas, representing one million cubic feet of gas at standard...
• Mils per year penetrationA measure of the corrosion rate of a material, indicating the depth of material loss in thousandths of an...
• MineralA naturally occurring, inorganic solid substance with a definite chemical composition and an ordered internal...
• Mineral interestThe ownership of the oil, gas, and other minerals beneath a tract of land, including the right to explore...
• MineralogyThe scientific study of minerals, including their chemical composition, crystal structure, physical...
• Minerals Management ServiceThe former United States Department of the Interior agency that leased offshore tracts, collected royalties...
• MinifracA small-scale hydraulic fracturing treatment performed before the main stimulation to gather data on...
• Minimum miscibility concentrationThe lowest concentration of an injected solvent in a reservoir fluid that achieves miscibility at a given...
• Minimum miscibility enrichmentThe lowest concentration of an enriching component, such as hydrocarbons or carbon dioxide, in an injected...
• Minimum miscibility pressureThe lowest pressure at which an injected gas becomes miscible with the reservoir oil, forming a single phase...
• Minimum restrictionThe smallest internal diameter or cross-sectional area within a wellbore completion that limits the passage...
• Minimum-time pathThe trajectory that a seismic wave follows between a source and a receiver, such that its travel time is the...
• Minute markA signal recorded on a well log, usually as a tick or deflection in a dedicated track, to indicate the...
• Mis tieThe difference in measured values, such as two-way travel time or depth, at the intersection point of two or...
• MiscibleDescribing two or more fluids that can mix in all proportions to form a single, homogeneous phase. In...
• Miscible displacementAn enhanced oil recovery process where an injected fluid, such as carbon dioxide or a hydrocarbon gas...
• MissileA high-pressure manifold unit on a hydraulic fracturing spread that collects the discharge lines of several...
• MistA dispersion of fine liquid droplets suspended in a gas phase, often encountered in gas processing and...
• Mist drillingA drilling technique that uses a mixture of air or gas and a small amount of water or foaming agent as the...
• Mist extractorA device installed within a separator or gas processing unit to remove fine liquid droplets from a gas...
• Mist flowA two-phase flow regime in a wellbore where a small amount of liquid is dispersed as fine droplets within a...
• Mixed depositsAccumulations within a reservoir or wellbore that consist of a combination of different solid or semi-solid...
• Mixed-metal hydroxideA class of synthetic layered double hydroxides, typically magnesium and aluminium hydroxide formed by...
• Mixed-metal silicateA synthetic mixed-metal silicate viscosifier added to bentonite water muds to raise yield and build a strong...
• MMCAn abbreviation for minimum miscibility concentration, the lowest concentration of a solvent in a gas that...
• MMEAn abbreviation for Minimum Miscibility Enrichment, representing the lowest concentration of an enriching...
• MMHAn abbreviation for mixed-metal hydroxide, a synthetic layered compound, typically magnesium aluminium...
• MMSThe abbreviation for the Minerals Management Service, the United States Department of the Interior agency...
• MMscfAn abbreviation for million standard cubic feet, a common unit for expressing large volumes of natural gas...
• Mobile offshore drilling unitA vessel or platform capable of engaging in drilling operations for exploration or production of oil and gas...
• MobilityThe ratio of a fluid's effective permeability to its viscosity, representing the ease with which that fluid...
• Mobility bufferA volume of fluid, usually a polymer solution, injected into a reservoir following a slug of chemical agent...
• Mobility controlThe process of adjusting the relative mobilities of injected and reservoir fluids to improve sweep efficiency...
• Mobility ratioThe ratio of the mobility of the displacing fluid to the mobility of the displaced fluid in a reservoir. A...
• ModelA simplified numerical or conceptual representation of the Earth's subsurface, designed to explain...
• Model driftThe degradation of a machine learning model's performance over time due to changes in the underlying data...
• Model managementThe governance and lifecycle administration of analytical and machine learning models, covering their...
• ModelingThe process of creating a simplified representation of a complex geological system or reservoir to understand...
• Modified isochronal testA well test procedure used to determine the flow capacity and reservoir characteristics of a gas well. It...
• MODUA mobile offshore drilling unit, which is a specialized vessel or platform used for drilling wells in marine...
• Modulus of compressionA measure of a material's resistance to uniform compression, also known as the bulk modulus. It quantifies...
• Modulus of elasticityA measure of a material's stiffness or its resistance to elastic deformation under stress, also known as...
• Modulus of rigidityA measure of a material's resistance to being deformed by shearing forces, quantifying its stiffness when...
• MohoThe Mohorovičić discontinuity, which is the boundary separating the Earth's crust from the underlying mantle...
• Mohorovicic discontinuityThe boundary separating the Earth's crust from the underlying mantle, characterized by a distinct increase in...
• Moldic porosityPore space within a rock formed by the dissolution of soluble grains or fossils, leaving behind an empty...
• MomentA measure of the tendency of a force to cause rotation about a point or axis, calculated as the product of...
• MonkeyboardA platform located high in the derrick or mast where the derrickman works during tripping operations. From...
• MonomerA small molecule that can chemically bond with other identical or different monomers to form a larger polymer...
• MonopoleA type of acoustic logging transducer that emits and receives compressional waves, which travel through the...
• Monte Carlo risk analysisA quantitative risk assessment technique that uses random sampling to simulate the outcomes of a project or...
• Monte Carlo samplingA computational technique that uses repeated random sampling to obtain numerical results, often for problems...
• Monte Carlo simulationA computational technique that uses random numbers to model the behavior of a system or process, especially...
• MontmorilloniteA common clay mineral belonging to the smectite group, known for its expansive properties when hydrated. It...
• MonumentA permanent, precisely surveyed marker installed at a fixed location within a seismic survey area, used as a...
• Moon poolAn opening in the hull or deck of an offshore drilling vessel or platform, extending through to the water...
• Morning tourA shift of a drilling crew, called a tour and pronounced tower, that begins in the morning hours. On a rig...
• Mosquito billA small-diameter tube fitted at the bottom of a sucker rod pump inside the gas anchor, connected to the pump...
• MotormanThe rig crew member responsible for the maintenance and operation of the engines and other mechanical...
• MouseholeA shallow, cased hole in the rig floor, typically located near the rotary table, used to temporarily store a...
• Moveable hydrocarbonsThe portion of hydrocarbons within a reservoir rock that can be produced and flow to the wellbore under...
• Moved hydrocarbonsHydrocarbons that have been displaced from their original position within the formation, typically by the...
• MoveoutThe difference in arrival time of a seismic reflection event recorded at different offsets (distances) from...
• Moving-source methodA profiling technique in which the energy source and the receivers move together as a unit, keeping a fixed...
• MPDManaged Pressure Drilling, a technique used to precisely control the annular pressure profile throughout the...
• MpyAn abbreviation for "mils per year," a unit used to express corrosion rates in materials, where one mil...
• MRSAn abbreviation for Magnetic Resonance Sounding, a geophysical technique used to detect and quantify...
• Mscf/dAn abbreviation for thousand standard cubic feet per day, a unit used to express the daily production rate of...
• MSDSA Material Safety Data Sheet, a document providing detailed information about a hazardous substance...
• MSEA measure of the mechanical work done to excavate a unit volume of rock, calculated in real time to assess...
• MTMagnetotellurics, a passive electromagnetic geophysical method that measures naturally occurring variations...
• MudA drilling fluid, a circulating mixture of liquids and solids used during drilling operations to cool and...
• Mud acidA mixture of hydrochloric acid and hydrofluoric acid used to dissolve clays and other silicate minerals that...
• Mud additiveAny chemical or material added to a drilling fluid to enhance its properties or achieve specific performance...
• Mud anchorA joint or several joints of tubing with a closed lower end, hung below the intake of a sucker rod pump to...
• Mud balanceA device used to measure the density or weight of drilling fluid. It operates on the principle of a beam...
• Mud cellA component of a filter press or rheometer designed to hold a sample of drilling fluid for testing its...
• Mud cleanerA solids control device that combines hydrocyclones and a vibrating screen to remove fine solids from...
• Mud densityThe mass per unit volume of a drilling fluid, also known as mud weight. It is the primary property used to...
• Mud engineerA specialist responsible for managing the properties of the drilling fluid, or mud, at a wellsite. This...
• Mud filtrateThe liquid component of a drilling fluid that passes through a filter medium, such as the formation wall...
• Mud hopperA cone-shaped device used to mix dry drilling fluid additives, such as bentonite or barite, into the...
• Mud inThe drilling fluid that is pumped from the mud pits down the drill string and into the wellbore. This fluid...
• Mud motorA downhole positive displacement motor that converts the hydraulic energy of drilling fluid into mechanical...
• Mud outThe drilling fluid that returns to the surface from the annulus between the drill string and the wellbore...
• Mud ovenA temperature-controlled heating device used in a drilling fluids laboratory to simulate downhole conditions...
• Mud pitA large, open tank or series of tanks used to store, mix, and treat drilling fluid on a drilling rig. These...
• Mud programA detailed plan specifying the properties and composition of the drilling fluid to be used for each section...
• Mud pulse telemetryA method of transmitting downhole data to the surface by generating pressure pulses in the drilling fluid...
• Mud reportA daily summary of drilling fluid properties, prepared by the mud engineer at the wellsite. It documents key...
• Mud retortA laboratory distillation apparatus that heats a measured mud sample of 10, 20 or 50 mL in a lidded steel cup...
• Mud return lineA large-diameter pipe that carries drilling fluid from the bell nipple, located below the rig floor, to the...
• Mud scaleA specialized balance used to measure the density or weight of drilling fluid. It consists of a cup for the...
• Mud stillA laboratory device used to separate and quantify the liquid components (oil and water) from a drilling fluid...
• Mud tracerA chemical or radioactive substance added to drilling fluid to track its movement or identify its source...
• Mud upTo prepare and mix drilling fluid to the required specifications for a particular section of a well. This...
• Mud weightThe density of the drilling fluid, measured in pounds per gallon (ppg), specific gravity, or grams per cubic...
• Mud-aging cellA laboratory device used to simulate downhole temperature and pressure conditions for testing the stability...
• MudcakeA layer of drilling fluid solids that deposits on the wellbore wall as filtrate invades permeable formations...
• Mudding offThe process where drilling fluid solids, particularly fine particles, plug or seal off permeable zones in the...
• Mudding upTo convert the fluid in the active circulating system to a conventional drilling mud, usually from clear...
• Mud-in sampleA representative sample of drilling fluid collected from the suction pit before it is pumped down the...
• Mud-out sampleA sample of drilling fluid collected from the flowline as it returns from the wellbore. This sample reflects...
• MudrockA fine-grained sedimentary rock composed primarily of clay and silt-sized particles, forming the most...
• Multi-agent system (mas)A computational system composed of multiple autonomous, interacting entities called agents, each capable of...
• Multicapacitance flowmeterA production logging tool that uses multiple capacitance sensors arranged around the wellbore to measure the...
• Multicomponent seismic dataSeismic data recorded by receivers capable of detecting ground motion in multiple directions, typically three...
• Multifinger caliperA logging tool equipped with multiple articulated arms or 'fingers' that extend to contact the inner wall of...
• MultilateralDescribing a wellbore that branches into two or more laterals from a main wellbore, allowing access to...
• Multimodal modelsArtificial intelligence models designed to process and integrate information from multiple data types or...
• Multipass methodA production logging technique where measurements are taken at multiple logging speeds or in both upward and...
• MultiphaseDescribing the simultaneous flow of two or more distinct fluid phases, such as oil, water, and natural gas...
• Multiphase flowThe simultaneous flow of two or more fluid phases, such as oil, gas, and water, within the reservoir or...
• Multiphase fluidA mixture of two or more distinct fluid phases, such as oil, gas, and water, that coexist within a reservoir...
• Multiphase holdup logA production log that measures the individual volumetric fractions of oil, water, and gas flowing...
• Multiphase meterA device that measures the individual flow rates of oil, gas, and water simultaneously from a well stream...
• Multiphase pumpA specialized pump capable of simultaneously handling a mixture of oil, gas, and water from a wellhead or...
• Multiple completionA well completion design that allows for the simultaneous production of hydrocarbons from two or more...
• Multiple reflectionA seismic wave that has undergone more than one reflection before arriving at a receiver. These waves can...
• Multiple regressionA statistical technique used to model the relationship between a dependent variable and two or more...
• Multiple salinityA core measurement in which a shaly sample is saturated in turn with brines of several salinities and its...
• Multiple service contractAn upstream petroleum agreement in which a host government, usually through its national oil company, hires...
• Multiple-contact miscibilityA condition where an injected fluid and reservoir oil become miscible after a series of mass transfer...
• Multiple-isotope logA radioactive tracer survey in which two or more isotopes with different gamma-ray energies are injected...
• Multiple-isotope spectroscopyA method of analysing the gamma-ray energy spectrum recorded by a downhole detector to separate the...
• Multiple-rate testsWell tests that involve flowing a well at several different stabilized production rates, with pressure...
• Multishot surveyA method for determining a wellbore's trajectory by taking a series of photographic or electronic...
• Multiwell padA single, prepared surface location from which multiple directional or horizontal wells are drilled to access...
• MuteTo zero out portions of a seismic record that are dominated by noise or unwanted coherent events, preventing...
• Mutual solventA chemical additive used in well treatments that is soluble in both oil and water, and often in acid. It...
• MWDA system that transmits downhole drilling parameters and formation evaluation data to the surface in real...
• MyAn abbreviation for million years, used to denote a point in geologic time or a duration. It is a standard...
• MYBPAn abbreviation for Million Years Before Present, used to specify a point in geologic time. This unit...
• Mysid shrimpSmall, shrimp-like crustaceans used in toxicity testing of drilling fluids and their components. These...

266 of 4,469 terms in Oil and gas terminology (MLC-0103). Request the full dataset.