دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a record of the measurement of porosity, done by comparing depth to the time it takes for a sonic impulse to travel through a given length of formation. The rate of travel of the sound wave through a rock depends on the composition of the formation and the fluids it contains. Because the type of formation can be ascertained by other logs, and because sonic transit time varies with relative amounts of rock and fluid, porosity can usually be determined in this way.

n: A display of traveltime of acoustic waves versus depth in a well. The term is commonly used as a synonym for a sonic log. Some acoustic logs display velocity.

n: compression of air or gas that exists when no heat is transferred between the air or gas and surrounding bodies (such as the cylinders and pistons in a compressor). It is characterised by an increase in temperature during compression and a decrease in temperature during expansion.

n: the expansion of a gas, vapour, or liquid stream from a higher pressure to a lower pressure with no change in enthalpy of the stream.

annular fluid expansion.

n: serves as clearinghouse for nationally coordinated voluntary standards for fields ranging from information technology to building construction. Address: 11 W. 42nd Street, 13th floor;New York, NY 10036;(212) 642-4900.

abbr: American National Standards Institute.

American National Standards Institute.

n: the surface that separates each successive layer of a stratified rock from the preceding layer. It is here that minor changes in sediments or depositional conditions can be observed.

surface separating layers in a sandstone. Usually bedding planes mark the transition of the particle transport event. An accumulation of minerals or other materials laid down at the time of rock deposition or generated by reworking, that may create signif

cycling coiled tubing from a yielded position, through a transition region, and back again. Running coiled tubing from the reel into a well and back to the reel involves six bends or three cycles.

n: 1. (slang) an oilfield worker who moves from one centre of activity to another;a floater or transient.2. a device used to tighten chains on a load of pipe or other equipment on a truck to make it secure.