دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a circular ring used to determine whether a bit is of the correct outside diameter. Bit gauges are often used to determine whether the bit has been worn down to a diameter smaller than specifications allow;such a bit is described as undergauge.

n: 1. a condition wherein the hole diameter narrows with depth owing to wear on the bit gauge caused by drilling abrasive formations. 2. a wellbore whose diameter is larger near the surface than near the bottom.

n: wells top hole diameter larger than lower hole, because bits diameter be grinded in drilling process.