دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a device used to reround slightly collapsed tubulars.

n: 1. a portion of cement placed at some point in the well bore to seal it. 2.a wiper plug. See cementing, wi per plug.

n: (1) a portion of cement placed at some point in the wellbore to seal off the well;(2) a device used during a primary cement job to separate the cement slurry from contaminating fluids in the casing. A wiper plug is pumped ahead of the slurry and a shut-o

a plug of cement set by various methods that plugs the tubulars or the open hole.

n: the buckling of tubing in a large-diameter pipe or casing.

compressional deformation of tubulars to the point where the tubing resembles a corkscrew. The condition may be temporary if the metal is not yielded past the elastic recovery point. Tubulars that are corkscrewed may be pumped through but will stick most

well construction tubulars run in like conventional casing but mechanically enlarged downhole before the cement is set.

wellbore tubulars run in like conventional completions but mechanically enlarged downhole once in place. Can include combinations of sand screens, blank pipe and annular isolation seals used in lieu of gravel packs.

a snubbing job in which the well is workover without killing the well with fluid. Usually accomplished by multiple barriers that seal on the tubulars.

n: a metal that has the property of attracting ferrous and certain other metals to it.

n: to connect tools or tubulars by assembling the threaded connections incorporated at either end of every tool and tubular. The threaded tool joints must be correctly identified and then torqued to the correct value to ensure a secure tool string and connec

n: The point on a string of tubulars at which there are neither tension nor compression forces present. Below the neutral point, there will be compression forces that build toward the bottom of the wellbore. Above the neutral point, tensile forces build to a

the theoretical point in pipe length that accounts for the effects of buoyancy.

n: a cylindrical or spherical device that is affixed to the end of a wireline just above the hook to keep the line straight and to provide weight. v: to soak metal pieces in a chemical solution to remove dirt and scale from the metals surface.

a chemical treatment of the tubulars to remove pipe dope, mill scale and mud or cement residue.

n: a phenomenon in which a decrease in the diameter of the borehole occurs because a plastic substance, such as salt, is being drilled. Since the temperature of the salt is higher than normal for a given depth (high temperature causes the salt to expand) and since mud weight is usually decreased when drilling such formations to maintain high penetration rates (thus decreasing the hydrostatic pressure exerted on the salt),the section of borehole in the salt zone can expand and possibly stick the drill stem. Also called salt squeeze.

n: Permanent mechanical or physical alteration that does not include rupture. Plastic deformation of rocks typically occurs at high temperatures and pressures, conditions under which rocks become relatively viscous.

a stress level, beyond the elastic limit, that produces yielding in tubulars.