دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a number that approximates the number of protons plus the number of neutrons in an atom;it expresses the relative weights of atoms.

n: The device that can control the bit weight automatically during drilling.

n: a mechanism used to regulate the amount of weight 00 the bit without the presence of personnel. Automatic drillers free the driller from the sometimes tedious task of manipulating the drawworks brake to maintain correct weight on the bit. Also called an automatic drilling control unit.

n: Mechanism to automatically control the weight on the bit.

n: The equipment controlling the bit weight automatically during drilling.

n: See automatic feed.

the amount of unused pull capacity of a rig after picking up the entire string weight.

Static condition of the length of tubing in the well, where buoyed tube weight (well fluid sensitive) equals the well pressure acting against the cross-sectional area of the tube. The balance point does not include any frictional forces exerted by frictio

n: see Buys-Ballots law. barite n: barium sulphate, BaSO4;a mineral frequently used to increase the weight or density of drilling mud. Its relative density is 4.2 (i.e., it is 4.2 times denser than water). See barium sulphate, mud.