دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the motion a bit makes when it does not rotate around its centre but instead drills with a spiral motion. It usually occurs to a bit drilling in a soft or medium soft formation when the driller does not apply enough weight or does not rotate the bit fast enough. A whirling bit drills an overgauge hole (a hole larger than the diameter of the bit) and causes the bit to wear abnormally.

n: a bit that does not have a uniformly round cross section;instead, the bit has a protuberance that projects from one side. An eccentric bit drills a hole slightly overgauge to compensate for certain formations, such as shale or salt, that deform and enlarge after being drilled. Eccentric bits can also ream undergauge holes.

n: the pterate bit with big and small flushing port and arranged eccentricly

n: hole which is caused by oversize bit.



a wellbore drilled with a full gauge bit (maintained initial diameter).

n: a wellbore drilled with a full-gauge bit. Also called a true-to-gauge hole.

n: A wellbore that is essentially the same diameter as the bit that was used to drill it. It is common to find well-consolidated sandstones and carbonate rocks that remain gauge after being drilled. For clays, it is common for the hole to slowly enlarge with

a drilled hole with no washouts;the same diameter as the bit.

n: the well that its diameter of hole is similar to the diameter of the using bit.

n: a hole that is not in gauge: that is, it is smaller or larger than the diameter of the bit used to drill it.

n: a hole whose diameter is larger than the diameter of the bit used to drill it. An overgauge hole can occur when a bit is not properly stabilised or does not have enough weight put on it.

n: the well its diameter exceeds the diameter of bit.

n: see overgauge hole.

n: a hole that is the same size as the bit that was used to drill it. It is frequently referred to as a full-gauge hole.