دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the transition zone between the continental slope and the oceanic abyss.

n: drill pipe that is manufactured with walls that are thicker than those in standard drill pipe. Special extnilength tool joints are attached to the heavier-walled tube. lYPically, 5-inch heavy wall ,.drill pipe weighs50 pounds per foot (75 kilograms per metre);5-inch conventional drill pipe weighs 19.5 pounds per foot (29 kilograms per metre). Also attached to the tube is a centre wear pad that protects the outside diameter of the pipe from abrasion. Heavy wall pipe is often used in the drill stem just above the drill coilars, in the transition zone between the stiffer collars and the more limber drill string, and in place of some drill collars to apply weight on the drill bit in smalliameter and horizontal holes. Sometimes erroneously called heavyweight drill pipe. Compare heavy- weight drill pipe.

n: an area within a permeable rock adjacent to a wellbore into which a filtrate (usually water) from the drilling mud has passed, with consequent partial or total displacement of the fluids originally present in the zone.

n: The volume close to the borehole wall in which some or all of the moveable fluids have been displaced by mud filtrate. It consists of the flushed zone and the transition zone or annulus. In simple models, the invaded zone and the flushed zone are consider

the part of the rock next to the wellbore into which wellbore fluid has leaked.

n: the pressure at which a gas injected into a reservoir vaporises hydrocarbons from crude oil to form a miscible transition zone between the gas and the crude oil. This liquid transition zone moves reservoir oil toward production wells. Miscibility pressure depends on the characteristics of the gas and the temperature and gravity of the reservoir crude oil. For carbon dioxide, hydrocarbon vaporisation begins at pressures between 1,000 pounds per square inch and 2,000 pounds per square inch at temperatures below 200�F with oils above 30. API. Several hundred additional points per square inch are required to reach the optimum miscibility pressure, at which sufficient hydrocarbons are vaporised to produce a profitable amount of oil.

n: the layer transition zone that changes from the normal pressur to abnormal pressure

n: 1. the area in which underground pressures begin to change from normal to abnormally high as a well is being deepened. 2. the areas in the drill stem near the point where drill pipe is made up on drill collars.

n: The transition formation from the normal formation pressure to abnomal formation pressure.

a zone where the flow type or saturation changes due to gas breakout, gas expansion, shear or turbulence.