Oil and Gas Terms Beginning with “M” — Page 8

A multifinger caliper (MFC) is a wireline logging tool that measures the internal diameter of a wellbore, tubing string, or casing at multiple azimuthal positions simultaneously by deploying an array of independent… Read more →

What Is a Multilateral Well? A multilateral well is a well configuration in which multiple lateral wellbore branches radiate from a single main wellbore, all tied back to the same wellhead and surface production… Read more →

The multipass method (also called the multipass filter test or ISO multipass filtration test) is a standardized laboratory test procedure for evaluating the filtration efficiency and contaminant capacity of hydraulic… Read more →

Referring to a fluid with several different immiscible fluids (oil, water or gas). Read more →

What Is Multiphase Flow in Oil and Gas? Multiphase flow is the simultaneous flow of two or more fluid phases — oil, water, and gas — through a pipe, wellbore, or porous medium. In oil and gas production, multiphase flow… Read more →

A multiphase fluid in petroleum engineering is a flowing mixture of two or more distinct fluid phases (gas, liquid oil, liquid water, and in some cases solid particles such as sand, wax crystals, or hydrate… Read more →

What Is Multiphase Fluid Flow? Multiphase fluid flow (also called two-phase or three-phase flow) is the simultaneous movement of two or more distinct fluid phases through the same conduit, whether a wellbore, pipeline,… Read more →

A multiphase holdup log is a downhole production-logging record of the volumetric fraction occupied by each fluid phase (oil, water, gas) at every depth in a producing or injecting wellbore, expressed as a dimensionless… Read more →

What Is a Multiphase Meter? A multiphase meter is a wellhead or subsea flow measurement instrument that simultaneously measures the individual flow rates of oil, water, and gas in a production stream without physically… Read more →

A multiphase pump is a mechanical device designed to simultaneously compress and transport mixed streams of gas, liquid crude oil, produced water, and suspended solids without upstream phase separation, using pump… Read more →

What Is a Multiple Completion? Multiple completion (also called a dual completion, multizone completion, or stacked completion) is a well design in which two or more separate reservoir intervals are produced… Read more →

A multiple reflection in seismic exploration is an unwanted reflected wave that has undergone more than one reflection in the subsurface before being recorded at the surface receiver — the seismic energy bounces between… Read more →

Multiple regression is a statistical method that models the linear relationship between a dependent variable (the outcome to be predicted or explained) and two or more independent variables (predictors or explanatory… Read more →

Multiple salinity is a special core analysis (SCAL) technique used to determine the electrical properties of a shaly core sample by sequentially flushing the sample with brines of different known salinities and… Read more →

A multiple service contract is a form of upstream petroleum agreement in which a host country, usually acting through its national oil company, engages an outside operator to supply a defined bundle of services and to… Read more →

Multiple-contact miscibility (MCM) is a condition achieved in enhanced oil recovery (EOR) gas injection processes where the injected gas (typically CO2, enriched natural gas, or hydrocarbon solvent) and the reservoir… Read more →

A multiple isotope log is a nuclear production logging technique in which two or more distinct radioactive tracer isotopes with different gamma ray emission energies are co-injected simultaneously or sequentially into… Read more →

The technique used to produce a multiple-isotope log. Read more →

What Are Multiple-Rate Tests? Multiple-rate tests (also called multi-rate deliverability tests or back-pressure tests) are a family of gas well evaluation procedures in which a well is produced at several different… Read more →

A multishot survey is a directional measurement technique that records the inclination and azimuth of a wellbore at many depths during a single run, producing a continuous picture of the path the hole has taken from… Read more →

In seismic data processing, to mute is to set the amplitude of selected portions of seismic traces to zero so that they contribute nothing to the final stacked image. The purpose is to remove energy that would degrade… Read more →

A mutual solvent is a chemical additive used in oilfield stimulation, workover, and completion operations that is miscible with (fully dissolves in) both water and oil — allowing it to function as a coupling agent that… Read more →

The common name for the small shrimp species Mysidopsis bahia, which is used as the test organism in a US EPA bioassay test protocol. Read more →