Purpose: cutting of casing string area at full diameter at any interval of the borehole. Blades of mills expand to the operating position under pressure drop in a section mill body. Distinctive feature: signalling system indicating full opening of blades, a back valve to prevent the stopping-up of the tool with bit cuttings. Mills are supplied with interchangeable blades, easily replaceable in drilling conditions. The blades are reinforced with high-quality compound alloy. At a client's request ready to supply an instrument with another sizes, different from the data, given in the table.
Standard Size
Diameter of a casing cut out, mm
Outside diameter of a body, mm
Centrallzer's diameter, mm
Outside diameter of extensible blades, mm
Coupling thread
GOST 28487-90
API 7
FKR-114
114
92
94; 96,4
142/55/8
З-66
23/8Reg
FKR-140
140
108
115,5; 118,2
164/61/2
З-86
NC-31
FKR-146
146
114
124; 125
170/63/4
З-86
NC-31
FKR-168
168
138
141; 144
215/81/2
З-88
31/2Reg
FKR-178
178
148
156; 157
223/9
З-102
NC-38
FKR-194
194
154
164
223/9
З-102
NC-38
FKR-219
219
185
187; 192
270/105/8
З-147
51/2FH
FKR-245
245
185
212,8; 216,5
289/113/8
З-147
51/2FH
*It is possible to produce a coupling thread of other sizes at a client's request.
