دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a warning device triggered by the presence of abnormal conditions in a machine or system. For example, a lowwater alarm automatically signals when the water level in a vessel falls below its preset minimum. Offshore, alarms are used to warn personnel of dangerous or unusual conditions, such as fires and escaping gases.

system 11: a type of tap sampling system found on liquid storage tanks. The permanently installed taps on the out- side of the tank are attached to pipes and a floating boom inside the tank that rises and falls with the liquid level.

n: a device made up in the drill stem above the mill to collect bits of junk ground away during a milling operation. During milling, drilling mud under high pressure forces bits of junk up the narrow space between the boot sub and hole wall. When the junk reaches the wider annulus above the boot sub and pressure drops slightly, the junk falls into the boot sub. A boot sub also can be run above the bit during routine drilling to collect small pieces of junk that may damage the bit or interfere with its operation. Also called a junk sub or junk boot.

a device run in the drill string just above the mill to catch cuttings.

n pi: particles that fall off (are sloughed from) the wall of the wellbore. Compare cuttings.

n: The block dropping into the wellbore due to fluctuation of borehole face.

loose formation materials that falls into the wellbore.

n: a metal device that is placed in the inner core barrel before coring. When all of the core has been removed from the core barrel, the core marker falls out to indicate that the barrel is empty. Also called a rabbit.

when the revenue from the produced fluids falls below the cost of operations set by the company.

n: a device used to connect long lines of pipe to allow the pipe joints to expand or contract as the temperature rises or falls.

n: the nipple tubular tools connected between the cementing pipe and left-handed ring joint and used to decrease the stress
ocurrs when breakout the cycling joint and be convenient for pulling out the cenment pipe


a device in a length of pipe that allows some pipe length expansion or contraction.

n: a perforating gun that consists of a hollow, cylindrical carrier into which are placed shaped charges. On detonation, debris created by the exploded charges falls into the carrier and is retrieved when the gun is pulled out of the hole;however, the gun cannot be re-used. See gun-perforate.

n pi: see parts of line.

n: a tank covering that rests on the surface of a hydrocarbon liquid in the tank and rises and falls with the liquid level. A floating roof eliminates vapour space above the liquid in the tank and conserves light fractions of the liquid.