Design features:
- frame and gear transmission case are an integral unit;
- drawworks lifting shaft is the gear transmission output shaft;
- drawworks braking with the help of the main drive motor;
- two- and single-speed transmission;
- Disc brake made of two discs for holding the drum immobile;
- two brake control systems – operation system and emergency system;
- Drum with “Lebus”-type grooves cut for rope (protective flanges with ring plates made from wear-resistant steel);
- simplicity of the apparatus;
- compactness;
- exclusion in the design of conventional structural components (chain transmission, air clutches, electromagnetic or hydromatic brake, band brake and brake control lever);
- remote control.
Advantages:
- considerably less weight in comparison with chain transmission drawworks;
- “low” and “high” lifting shaft speeds due to the gear transmission:
-“high” speed is for pulling out and running of the drill-string and the empty elevator,
“low” speed is for operations with the casing string and breakdown elimination;
- multifunction drive:
— pulling out and variable running of drilling and casing pipes, raising and lowering of the empty elevator up to the full stop and holding it immobile;
— variable drilling bit feeding at the bit feed controller mode;
- transmission case hermeticity due to seals of a specific design (no cups).
Drawworks with electric drives and one-speed chain
| Parameters/Model | LBU 600 AC-1 | LBU 670 ET-1M | LBU 670 ET-1 | LBU 670 AC-1M | LBU 1500 AC-1 | LBU 1500 AC1-PTC |
| Load capacity, t/lbs (line string-up) | 175/385809 (4х5) | 200/440924 (5х6) | 200/440924 (5х6) | 200/440924 (5х6) | 320/705479(5х6) 400/881849(6х7) |
320/705479(5х6) 400/881849(6х7) |
| Maximum hook lifting speed, ft/s (line string-up) | 4.59 | 4.59 | 4.59 | 4.59 | 4.59 (5х6) 4.1 (6х7) |
4.59 (5х6) 4.1 (6х7) |
| Drill line diameter, in. | 1-1/8 | 1-1/8 | 1-1/8 | 1-1/8 | 1-3/8 | 1-3/8 |
| Rated input power, HP | 816 | 911 | 911 | 911 | 2040 | 2040 |
| Electric drive type | AC | DC | DC | AC | AC | AC |
| No. of electric motors | 1 | 1 | 1 | 1 | 2 | 2 |
| Drum size, in. | ||||||
| diameter | 22.04 | 22.04 | 22.04 | 22.04 | 29.92 | 29.92 |
| length | 48.07 | 41.22 | 48.07 | 41.22 | 57.16 | 57.16 |
| Mechanical brake type | Disc | Disc | Disc | Disc | Disc | Service — Disc, Emergency — Spot-type disk |
| Brake mechanism place of installation |
Hoisting shaft |
Hoisting shaft |
Hoisting shaft |
Hoisting shaft |
Hoisting shaft |
Service — on drive shafts, Emergency — on hoisting shaft |
| No. of brake mechanisms | 1 | 1 | 1 | 1 | 1 | 2 |
| Drawworks dimensions, in. |
||||||
| length | 138.8 | 121.85 | 138.77 | 119.48 | — | 137.4 |
| width | 118.7 | 124.09 | 119.01 | 125.07 | — | 123.4 |
| height | 87.7 | 79.13 | 79.13 | 81.25 | — | 88.43 |
| Drawworks weight, lbs. | 37037.7 | 40344.58 | 39242.27 | 37919.5 | — | 53286 |
| Drawworks module dimesions, in. |
||||||
| length | — | 736.22* | 239.37 | 736.22* | 283.5 | 285.7 |
| width | — | 131.49* | 146.25 | 131.49* | 123.4 | 123.4 |
| height | — | 202.75* | 101.49 | 202.75* | 109.2 | 107.3 |
| Drawworks module weight, lbs. |
— | 122026* | 57100 | 119050* | 71849 | 75751 |
* — on a semi-trailer
Drawworks with electric drives and tow-speed chain
| Parameters/Model | LBU 750 E-SNG | LBU 900 ET-3 | LBU 900 АС-2 | LBU 1200 ET-3 | LBU 1500 ET-3 | LBU 1500 АС-2 |
| Load capacity, t/lbs (line string-up) | 225/496040 (5×6) | 270/595248 (5х6) | 270/595248 (5х6) | 400/881849 (6х7) | 320/705479 (6х7) | 450/992080 (6х7) |
| Maximum hook lifting speed, ft/s (line string-up) | 5.57 | 5.25 | 5.25 | 5.12 | 4.92 | 4.92 |
| Drill line diameter, in. | 1-1/8 | 1-1/4 | 1-1/4 | 1-3/8 | 1-3/8 | 1-1/2 |
| Rated input power, HP | 1020 | 1224 | 1224 | 1630 | 2040 | 2040 |
| Electric drive type | DC | DC | AC | DC | DC | AC |
| No. of electric motors | 1 | 1 | 1 | 1 | 2 | 2 |
| Drum size, in. | ||||||
| diameter | 560 | 640 | 640 | 685 | 760 | 760 |
| length | 1190 | 1243 | 1243 | 1373 | 1452 | 1452 |
| Mechanical brake type | Band | Spot-type disk | Spot-type disk | Spot-type disk | Disk | Spot-type disk |
| Brake mechanism place of installation | Hoisting shaft | Transmission countershaft |
Transmission countershaft |
Transmission countershaft |
Transmission countershaft |
Transmission countershaft |
| No. of brake mechanisms | 1 | 1 | 1 | 1 | 1 | 1 |
| Drawworks dimensions, in. | ||||||
| length | — | 171.9 | 172.2 | 174.4 | 309.1 | 291.9 |
| width | — | 119.1 | 120.1 | 126 | 133.5 | 139.1 |
| height | — | 85.91 | 94.49 | 89.13 | 96.02 | 98.5 |
| Drawworks weight, lbs. | — | 50 839 | 47311 | 58533 | 90257 | 82288 |
| Drawworks module dimesions, in. |
||||||
| length | 324.8 | 333 | 333 | 261.8* | 310.9* | 450.8 |
| width | 136.8 | 136.2 | 128.9 | 136.1* | 215.4* | 151 |
| height | 92.2 | 134.6 | 134.6 | 94.09* | 105.9* | 129.1 |
| Drawworks module weight, lbs. |
76897 | 68961 | 65169 | 66580* | 99080* | 98767 |
* — on semi-trailer
