دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a substance, such as tetraethyl lead or other compounds, added to the fuel of an internal-combustion engine to prevent detonation of the fuel. Antiknock compounds effectively raise the octane rating of a fuel so that it burns properly in the combustion chamber of an engine. See octane rating, tetraethyl lead.

n: the measurement of how well an automotive gasoline resists detonation or pinging in a spark-ignition engine.

n: a gas phase above a liquid phase in a vessel. It is placed there to protect the liquid from contamination, to reduce the hazard of detonation, or to pressure the liquid. The gas has a source outside of the vessel.

burning, decomposition or low order detonation of explosive.

n: 1. an explosion. 2. the knock or ping produced when fuel of too-low octane rating is used in the engine. Compare preignition.

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: when explosives are used to fracture a formation. At the moment of detonation, the explosion furnishes a source of high-pressure gas to force fluid into the formation. The rubble prevents fracture healing, making the use of proppants unnecessary. Compare hydraulic fracturing.

one of several techniques used to break the rock in the near well area. It was an early stimulation method. Fractures formed in this method are short. Although still used, its best application is in perf breakdown and overcoming some near well damage.

a perforating gun that surrounds the charges and contains much of the shock of the detonation.

n: a perforating gun consisting of a hollow, cylindrical metal tube into which are loaded shaped charges or bullets. On detonation, debris caused by the exploding charges falls into the carrier to be retrieved with the reusable gun.

n: a kind of Shaped - perforating guns

detonation cord for explosives. PrimacordTM is a trademarked name for detonation cord. Normally used in a perforating gun.