- Annular velocity
Annular Velocity [http://www.glossary.oilfield.slb.com/Display.cfm?Term=annular%20velocity] is the speed of a fluid's movement in a column called an annulus. [http://en.wikipedia.org/wiki/Annulus_(mathematics)] It is normally measured in feet per minute (fpm). Annular velocity is often abbreviated as AV, though this is not exclusively so, as AV also refers to
Apparent viscositywhich is calculated from rheometerreadings from tests that the Mud engineerperforms.
For this article, annular velocity is described, as used in
drilling fluidapplications in the Oil exploration industry. There may be other applications in other fields of study such as fluid mechanics(The study of the movement of fluid) or fluid dynamics(The study of the flow of fluid).
The Annular Velocity can be calculated using one of the following "formulæ".
*AV = Annular Velocity
*PObpm = Pump Output in bpm (barrels per minute) 1 barrel = 42 gallons
*POgpm = Pump Output in gpm (gallons per minute) 1 gallon = 0.0238095238 barrels
*ID2 = Inside Diameter of the or casing, squared
*OD2 = Outside Diameter of the drill pipe or tubing, squared
*1029.4 = A conversion factor constant used to calculate the volume between the outside of a tube within the inside of another tube, using barrels.
*24.5 = A conversion factor constant used to calculate the volume between the outside of a tube within the inside of another tube, using gallons.
*Pump Output = Refers to the measurement of the quantity of a fluid (to put that fluid in motion).
The Annular Velocity is one of two major variables in the process of cleaningsolids (
drill cuttings) from the . By maintaining the annular velocity at certain rates (speeds) in conjunction with the rheological properties of the drilling fluid, the wellbore is kept clean of the drill cuttingsto prevent them from settling back down to the bottom and causing drilling problems.
The other major variable is the
rheologyof the drilling fluid. Rheologyis sometimes thought of as viscosityto the uninitiated, though improperly. Viscosity(sometimes thought of as it's thickness) is a very basic measurement of the fluids resistance to change in movement or flow. The viscosityof a fluid can be measured with a Marsh Funnel. Rheologyis the study of viscosityand requires more precise and complicated procedures and equipment for it's determination. For drilling fluid applications a rheometeris used.
*Oil field acronyms
List of oilfield service companies
List of oil fields
Natural gas field
Wikimedia Foundation. 2010.
Look at other dictionaries:
Velocity (disambiguation) — Velocity can mean: * Velocity in physics * Speed * Velocity (biochemistry), a subject of Michaelis Menten kinetics in biochemistry. * Velocity (novel), by US author Dean Koontz * Velocity (newspaper), a weekly alternative newspaper in Louisville … Wikipedia
Drilling fluid — This article is about fluids used when drilling a well. For fluids used with drill bits during metal working, see cutting fluid. Driller pouring a foaming agent down the rod string on a drilling rig In geotechnical engineering, drilling fluid is… … Wikipedia
Drilling mud — In geotechnical engineering, drilling mud, also known as spud mud (when beginning the drilling process), is a drilling fluid used to drill boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling… … Wikipedia
List of oil field acronyms — Contents 1 # 2 A 3 B 4 C … Wikipedia
скорость восходящего потока бурового раствора в затрубном пространстве — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN annular return velocityupward annular velocity of drilling mud … Справочник технического переводчика
AV — may mean: * Av, a month in the Hebrew calendar * Av is a common abbreviation for aperture priority on a camera mode dial.aV may mean: *attovolt, an SI unit of electromotive forceav may mean: *Avar language; ISO 639 1 code for this languageAV may… … Wikipedia
скорость в кольцевом затрубном пространстве — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN annular velocity … Справочник технического переводчика
скорость потока в кольцевом зазоре — — [А.С.Гольдберг. Англо русский энергетический словарь. 2006 г.] Тематики энергетика в целом EN annular velocityAV … Справочник технического переводчика
Combustor — Flame stabilized by cyclone. A combustor is a component or area of a gas turbine, ramjet, or scramjet engine where combustion takes place. It is also known as a burner, combustion chamber or flame holder. In a gas turbine engine, the combustor or … Wikipedia
Venturi scrubber — A venturi scrubber is designed to effectively use the energy from the inlet gas stream to atomize the liquid being used to scrub the gas stream. This type of technology is a part of the group of air pollution controls collectively referred to as… … Wikipedia