دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

explosive wrapped with elastomer in the shape of a cord. Used to link and detonate charges in perforating guns.

n: (slang) a person who prospects for oil, especially by using seismology. Also called doodlebugger. v: (slang) to explore for oil, especially by using seismic techniques in which explosive charges are detonated in shot holes to create shock waves (name taken from the resemblance of these explosions to the puffs of loose dirt thrown up by the doodlebug, or ant lion, when digging its funnel-shaped hole).

seismograph.

v: to create holes in casing and cement set through a productive formation. A common method of completing a well is to set casing through the oil-bearing formation and cement it. A perforating gun is then lowered into the hole and fired to detonate high-powered jets or shoot steel projectiles (bullets) through the casing and cement and into the pay zone. The formation fluids flow out of the reservoir through the perforations and into the wellbore. See jetperforate, perforating gun.

n: a procedure for severing pipe stuck in a well by detonating special Shaped- charge explosives similar to those used in jet perforating. The explosive is lowered into the pipe to the desired depth and detonated. The fon:e of the explosion makes radiating horizontal cuts around the pipe, and die severed portion of the pipe is retrieved.

n: a special method using the explosion of dynamite to cut the frozen pipe.

v: to create holes through the casing with a shaped charge of high explosives instead of a gun that fires projectiles. The loaded charges are lowered into the hole to the desired depth. Once detonated, the charges emit short, penetrating jets of high- velocity gases that make holes in the casing and cement for some distance into the formation. Formation fluids then flow into the wellbore through these perforations. See bullet perforato1;gun-perforate.

n: an explosive charge detonated in the borehole to break up large pieces of junk in order to facilitate the junks removal from the hole.

v: to pierce the casing wall and cement of a wellbore to provide holes through which formation fluids may enter or to provide holes in the casing so that materials may be introduced into the annulus between the casing and the wall of the borehole. Perforating is accomplished by lowering into the well a perforating gun, or perforator, which fires electrically detonated bullets or shaped charges. See bullet perforator;jet-perforate, perforating gun.

n: to pierce the casing wall and cement,allowing formation fluids to enter the wellbore and flow to surface. This is a critical stage in the completion of a well. Perforating may also be carried out during workover operations.

n: the devices used to set permanent tools in a producing well;the assembly is lowered into the well on wireline. When the desired setting depth is reached, an explosive is detonated to set the tool.

n: 1. a charge of high explosive, usually nitroglycerine, detonated in a well to shatter the formation and expedite the recovery of oil. Shooting has been almost completely replaced by formation fracturing and acid treatments. 2. a point at which a photograph is made in a single-shot survey. See directional survey.