STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

526 Drilling and Well Completions
1
16
1. Drive to pump
2. Master clutch
3. Generator
4. Air compressor
5. Washdown pump
6. Sand reel drive
7. Drum high air clutch
8. Auxiliary brake
11
9. Rotary drive air clutch countershaft
10. Driller’s console
11. Drum low air clutch
12. High gear
13. Reverse gear
14. Intermediate gear
15. Low gear
16. Power flow selector*
*Note: This item is shown as a manually operated clutch.
This, of course, on an actual rig would be air actuated.
Figure 4-9. Power train on a drawworks with accessories.
drawworks. The driller operates the compound and the drawworks (and other
rig functions) from a driller’s console (see Figure 4-11).
With the compound, the driller can obtain as many as 12 gears working
through the drawworks transmission.
In Figure 4-11, the driller’s console is at the left of the drawworks. Also, the
hoisting drum and sand reel can be seen. The driller’s brake control is between
the driller’s console and the drawworks to control the brake systems of the
hoisting drum.
Hoisting Drum. The hoisting drum (usually grooved) is probably the most
important component on the drawworks. It is through the drum that power is
transmitted to lift the drill string with the drilling line (wire rope) wound on
the drum. From the standpoint of power requirements for hoisting, the ideal