دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a report that lists each bit used during a drilling operation, giving the type, the footage it drilled. the formation it penetrated, its condition, and so on.

a record of bit run, depth, rate of penetration, etc., in a wellbore.

n: the threaded portion of the top of the bit that is screwed into the drill collar. Also called the pin.

the applied downhole axial force component from the string weight.

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.

the motion that a bit makes when it does not rotate about its center. This may manifest itself in out of round holes and severe bit damage. Generally a poor drilling performance.

n: a compound of asphalt and filler that is used to coat metals exposed to corrosion or weathering.