Roller reamers are employed in
boring operations for the oil & gas industry.
The main function of roller reamers cut earth formations to enlarge the
borehole
A borehole is a narrow shaft bored in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes, including the extraction of water ( drilled water well and tube well), other liquids (such as petr ...
to the desirable size during well drilling operation, which may be the original size of the
drill bit
A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In orde ...
in the case where the
drill bit
A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In orde ...
wears to be under-gauged. However, even for new drill bits, roller reamers are employed to cut formations because the bit does not always drill a true bore hole and because of slight lateral shifting which is inherent in the drilling operation, which shifting leaves ledges and other distortions.
Additionally, the second function of a roller reamer is to keep the drill stem in the center of the hole at the specific position of placement of the roller-reamer. In providing such a function, a reamer is often referred to as a stabilizer. Maintaining the drill stem centered has many beneficial effects, its primary one being minimizing unintentional hole-angle
directional drilling.
Sizes
Popular hole sizes for well bores range from 5" to 26" in diameter. Size of circulation passage through the center of the body of the reamer typically range from 1 1/2" to 3 1/4" in diameter. The body size on the necks beyond the area where the rollers are mounted typically range from 4 1/8" to 11" in diameter. This latter size will normally be the same size as the drill collar. Body links normally range from 4' to 8'.
3-point / 6-point
Most roller-reamers have three rollers equally spaced in a single transverse section. Such roller-reamers are referred to as "3-point reamer". When two sets of three rollers spaced apart longitudinally are used, the roller-reamer is called a "6-point reamer". However, large diameter roller-reamers may have more than three rollers in one transverse section.
See also
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Drilling rig
A drilling rig is an integrated system that Drilling, drills wells, such as oil or water wells, or holes for piling and other construction purposes, into the earth's subsurface. Drilling rigs can be massive structures housing equipment used to ...
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Driller (oil)
The Driller is a team leader in charge during the process of well drilling. The term is commonly used in the context of an oil well drilling rig. Driller comes after the Toolpusher in the Rig crew hierarchy. Toolpusher takes the operation orders f ...
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Drill bit
A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In orde ...
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Drilling stabilizer {{Short description, Part of a borehole drill string assembly
A drilling stabilizer is a piece of downhole equipment used in the bottom hole assembly (BHA) of a drill string. It mechanically stabilizes the BHA in the borehole in order to avoid uni ...
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Hole opener
External links
Roller Reamer 3-point / 6-point sheet from Drillstar Industries
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Drilling technology
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