دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a method of improved recovery in which steam is injected into a reservoir through injection wells and driven toward production wells. The steam reduces the viscosity of crude oil, causing it to flow more freely. The heat vaporises lighter hydrocarbons;as they move ahead of the steam, they cool and condense into liquids that dissolve and displace crude oil. The steam provides additional gas drive. This method is used to recover viscous oils. Also called continuous steam injection or steam flooding. Compare cyclic steam injection, thermal recovery.

a tertiary oil recovery method involving injection of steam into the reservoir to reduce the oil viscosity.

n: a rotary drilling rig on which steam engines operate as prime movers. High-pressure steam is furnished by a boiler plant located near the rig. Steam rigs have been replaced almost totally by mechanical or electric rigs.

n: A kind of rotary equipment powered with steam engine.

n: a fog created when cold. dry air moves over a much warmer body of water. Also called sea smoke.

n: a device used in tank strapping for measuring the distance apart along the an;of two points on a tank shell where it is not possible to use a strapping tape directly because of an intervening obstruction. e.g., a protruding fitting.

n: a valve that shuts off or regulates fluid flow. v: to shut in intermittently to allow a build-up of gas pressure in a producing oilwell, which thus effects more efficient recovery.

n: 550 million-barrel (87,450 million-litre) stock- pile of petroleum in 6 storage sites and 4 marine terminals connected by 240 miles (386 kilometres) of pipeline. Maintained by the federal government for use during periods of major supply interruption.

n: a low-level cloud composed of water droplets, which covers the sky in a gray sheet.

n: a portion of an electric current that flows over a path other than the intended path, causing corrosion of structures immersed in the same electrolyte.

the difference in potential between the earth and the well. Measured and minimized before explosive operations may proceed. Also a measure of corrosion potential.

n: an explosive method utilizing Primacord. which is an instantaneous textilecovered fuse with a core of very high explosive. It is used to create an explosive jar inside stuck drill pipe or tubing so that the pipe may be backed off at the joint immediately above where it is stuck.

n: An explosive line which ,when detonated ,imparts concussion to pipe causing it to unscrew or back-off.Also called Prima-Cord.

one to four strands of explosive detonating cord suspended by wireline in a well and exploded to “rattle” the pipe and drop scale and debris from the sides of the pipe. Used frequently in back-off operations (unscrewing a pipe joint downhole).