دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the penetration of overlying layers by a rising column of salt or other easily deformed mineral caused by differences in density.

n: the process or processes of deformation of the earths crust that produce oceans, continents, mountains, folds, and faults.

n: an earthy deposit made up of the siliceous cell walls of onecelled marine algae called diatoms. It is used as an admixture for cement to produce a lowdensity slurry.

silica particles from Diatom beds. Used as a filtering media and as an additive to cement.

n: a collar or coupling of tool steel, threaded internally, that can be used to retrieve pipe from the well on fishing jobs;the female counterpart of a taper tap. The die collar is made up on the drill pipe and lowered into the hole until it contacts the lost pipe. If the lost pipe is stuck so that it cannot rotate, rotation of the die collar on top of the pipe cuts threads on the outside of the pipe, providing a firm attachment. The pipe is then retrieved from the hole. It is not often used because it is difficult to re- lease it from the fish should it become necessary. Compare taper tap.

n: See box tap.

n: Sticking that occurs when a portion of the drill string (usually the drill collars) becomes embedded in the filter cake resulting in a nonuniform distribution of pressure around the circumference of the pipe. The conditions essential for sticking require

a curve recorded as a simultaneous SP measurements from two electrodes, each serving as a reference potential for the other.

n: a condition in which the drill stem becomes stuck against the wall of the wellbore because part of the drill stem (usually the drill collars) has become embedded in the filter cake. Necessary conditions for differential-pressure sticking, or wall sticking, are a permeable formation and a pressure differential across a nearly impermeable filter cake and drill stem. Also called wall sticking. See differential pressure, filter cake.

n: One of the mechanisms causing stuck pipe by having excessive mud weight.

a common method of pipe sticking where the overbalance pressure in the wellbore pushes the tubing against the side of the wellbore in a permeable formation.

n: In drill fluid, in order to keep electric neutrality the clay colloids which carry negative charge must attract the same number of cations.As a result,an electric layer forms in the interface between Solid and liquid. Some cations

n: 1. a European term for the depth of liquid in a storage tank. 2. formation dip. See formation dip. iMage. ullage.

n: the angle at which the bed of formation slopes away from the horizon

the angle that the structural surface or bedding plane or fault surface makes with the horizontal. Measured perpendicular to the strike and in the vertical plane.