Table T1. LWD/MWD bottom-hole assembly (BHA) components for 12¼ inch bit and 20 inch underreamer.
| BHA component | Length of tool (m) | Total length of the top of tool from the bit (m) |
|---|---|---|
| 12-1/4 inch PDC bit | 0.290 | 0.290 |
| GVR-8 w/2 × 12-1/8 inch stabilizer | 3.882 | 4.172 |
| ARC-8 | 5.644 | 9.816 |
| TeleScope 825 | 8.435 | 18.251 |
| 12-1/8 inch ILS (stabilizer) | 0.830 | 19.081 |
| sonicVISION 825 | 7.299 | 26.380 |
| 12-1/8 inch stabilizer | 2.375 | 28.755 |
| 8-1/2 inch drill collar | 9.223 | 37.978 |
| CST 10-5/8 inch × 16-1/2 inch | 1.310 | 39.288 |
| Cutter part of CST | 0.340 | 38.318 |
| Anderreamer 16-3/8 inch × 20 inch | 7.500 | 46.788 |
| Cutter part of Anderreamer | 4.500 | 43.788 |
| Float sub | 1.085 | 47.873 |
| 9-1/2 inch drill collar | 9.308 | 57.181 |
| 9-1/2 inch drill collar | 9.246 | 66.427 |
| 17 inch stabilizer | 1.706 | 68.133 |
| 9-1/2 inch drill collar | 9.310 | 77.443 |
| Crossover | 1.000 | 78.443 |
| 8-1/2 inch drill collar | 9.310 | 87.753 |
| 8-1/2 inch drill collar | 8.930 | 96.683 |
| 8-1/2 inch drill collar | 9.310 | 105.993 |
| 7-3/4 inch drilling jar | 10.635 | 116.628 |
| 8-1/2 inch drill collar | 9.220 | 125.848 |
| 8-1/2 inch drill collar | 9.310 | 135.158 |
| 8-1/2 inch drill collar | 9.305 | 144.463 |
| Crossover | 0.508 | 144.971 |
| 5.68 inch heavy weight drill pipe | 9.050 | 154.021 |
| 5.68 inch heavy weight drill pipe | 9.042 | 163.063 |
| 5.68 inch heavy weight drill pipe | 9.042 | 172.105 |
| 5.68 inch heavy weight drill pipe | 9.043 | 181.148 |
| 5.68 inch heavy weight drill pipe | 9.043 | 190.191 |
| 5.68 inch heavy weight drill pipe | 9.050 | 199.241 |
| 5.68 inch heavy weight drill pipe | 9.050 | 208.291 |
| 5.68 inch heavy weight drill pipe | 9.050 | 217.341 |
| 5.68 inch heavy weight drill pipe | 9.042 | 226.383 |
| 5.68 inch heavy weight drill pipe | 9.050 | 235.433 |
| 5.68 inch heavy weight drill pipe | 8.963 | 244.396 |
| 5.68 inch heavy weight drill pipe | 9.050 | 253.446 |
| Crossover | 1.002 | 254.448 |
PDC = polycrystalline diamond compact. GVR = geoVISION resistivity tool. ILS = instrument landing system. CST = concentric string tool.
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