The Tapered Mill Type XZ is used to recover bore size. It is mainly used to mill collapsed casing or eliminate restrictions, and can clear mineral crystals and some other hard debris stranding on the well wall.
Specifications
| NOMINAL O.D. MM(IN) | CONNECTION |
SUITABLE HOLE DIAMETER MM(IN) |
| 89(3-1/2) | NC26、3-3/8REG | 95.2～101.6 (3-3/4～4) |
| 97(3-13/16) | 107.9～114.3(4-1/4～4.5) | |
| 110(4-5/16) | NC31、2-7/8REG、3-1/2REG | 117.5～127.0(4-5/8～5) |
| 121(4-3/4) | 130～139.7(5-1/8～5-1/2) | |
| 130(5-1/8) | 142.9～152.4(5-5/8～6) | |
| 140(5-1/2) | NC38、3-1/2REG、4-1/2REG | 155.6～165.1(6-1/8～6-1/2) |
| 156(6-1/8) | 168～187.3(6-9/16～7-3/8) | |
| 178(7) | 190.5～209.5(7-1/2～8-1/4) | |
| 200(7-7/8) | NC50、4-1/2REG | 212.7～241.3(8-3/8～9-1/2) |
| 232(9-1/8) | 244.5～269.9(9-5/8～10-5/8) | |
| 257(10-1/8) | 6-5/8REG | 273～295.3(10-3/4～11-5/8) |
| 279(11) | 298.5～317.5(11-3/4～12-1/2) | |
| 295(11-5/8) | 320.6～346.1(12-5/8～13-5/8) | |
| 330(13) | 349.3～406.4(13-3/4～16) | |
| 381(15) | 406.4～444.5(16～17-1/2) | |
| 406(15) | 7-5/8REG | 431.8～508(17～20) |
| 432(17) | 457.2～533.4(18～21) | |
| 534(21) | 558.8～660(22～26) | |
| 686(27) | 711.2～863.6(28～34) |
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