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Underreamers
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Underreamers are purposed to reamer borehole shaft areas in soft and medium rock formation at every depths. Blades of the underreamer expand to the operating position under pressure drop in a reamer body. Underreamers are supplied with interchangeable blades, easy demountable in drilling conditions. At a client's request we are ready to supply an instrument with other sizes, different from the data given in the table.
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Standard size |
OD of the
body, mm |
Diameter of
centralizers, mm |
OD acc. to
extended
blades, mm |
Length,
mm |
Coupling thread* |
GQST 28487-90 |
API 7 |
| RR–95/142 |
92 |
94 |
142 |
1360 |
Ç-66 |
23/8 Reg |
| RR–105/132 |
105 |
132 |
132 |
1530 |
3-86 |
NC-31 |
| RR–118/146 |
114 |
118 |
146 |
1545 |
Ç-86 |
NC-31 |
| RR–118/152 |
114 |
118 |
152 |
1545 |
Ç-86 |
NC-31 |
| RR–115/226 |
115 |
116,5 |
226 |
1590 |
3-86 |
NC-31 |
| RR–120/226 |
120 |
122 |
226 |
1590 |
Ç-86 |
NC-31 |
| RR–132/168 |
132 |
136 |
168 |
1465 |
Ç-88 |
31/2 Reg |
| RR–132/226 |
132 |
136 |
226 |
1590 |
3-102 |
NC-38 |
| RR–138/175 |
138 |
148 |
175 |
1685 |
3-102 |
NC-38 |
| RR–138/190,5 |
138 |
160 |
190,5 |
1640 |
Ç-102 |
NC-38 |
| RR–138/226 |
138 |
142 |
226 |
1640 |
Ç-102 |
NC-38 |
| RR–138/240 |
138 |
142 |
240 |
1640 |
3-102 |
NC-38 |
| RR–138/280 |
138 |
142 |
280 |
1640 |
Ç-102 |
NC-38 |
| RR–185/240 |
185 |
212 |
240 |
1585 |
Ç-147 |
51/2 FH |
| RR–185/245 |
185 |
212 |
245 |
1585 |
Ç-147 |
51/2 FH |
| RR–185/310 |
185 |
212 |
310 |
1585 |
Ç-147 |
51/2 FH |
| RR–185/380 |
185 |
212 |
380 |
1620 |
Ç-147 |
51/2 FH |
*It is possible to produce a coupling thread of other sizes at a client's request.
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