دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pI: 1. on a bit used on a rotary rig, the elements on the end (and sometimes the sides) of the bit that scrapes, gouges, or otherwise removes the formation to make hole. 2. the parts of a reamer that actually contact the wall of the hole and open it to full gauge. A three-point reamer has three cutters;a six-point reamer has six cutters. Cutters are available for different formations.

n: The cogging of cone of cone bit.

n: any of a variety of drilling bits that have no moving parts. As they are rotated on bottom, elements of the bit make hole by being pressed into the formation and being dragged across it. See fishtail bit.

n: A drilling bit that has no cones or bearings but consists of a single unit with a cutting structure and circulation passageways. The fishtail bit was an early example of a drag bit, but is no longer in common use. Diamond bits are also drag bits.

n: trade name for a down- hole motor driven by drilling fluid that imparts rotary motion to a drilling bit connected to the tool. thus eliminating the need to turn the entire drill stem to make hole. Used in straight and directional drilling.

v: to create holes through the casing with a shaped charge of high explosives instead of a gun that fires projectiles. The loaded charges are lowered into the hole to the desired depth. Once detonated, the charges emit short, penetrating jets of high- velocity gases that make holes in the casing and cement for some distance into the formation. Formation fluids then flow into the wellbore through these perforations. See bullet perforato1;gun-perforate.

v: to deepen the hole made by the bit, i.e., to drill ahead.

v: to drill ahead.

drill.

v: see make hole.

n: The process that bit crush rock at bottom hole then deepen the hole.