Chapter IV the rotary system

EXERCISE 1 Read and translate the text, using the words after the text.

The rotary system includes all of the equipment used to achieve bit rotation. The main parts of the rotary system are the swivel, the kelly, the rotary drive, the rotary table, the drill pipe and drill collars.

The swivel supports the weight of the drill string and permits rotation. The bail of the swivel is attached to the hook of the transmitting block, and the goose­ neck of the swivel provides a downward-pointing connection for the rotary hose. Swivels are rated according to their load capacities.

The kelly is the first section of pipe below the swivel. The outside cross-section of the kelly is square or hexagonal to permit it to be gripped easily for turning. Torque is transmitted to the kelly through kelly bushings, which fit in­side the master bushing of the rotary table. The kelly must be kept as straight as possible. Rotation of a crooked kelly causes a whipping motion that results in unnecessary wear on the crown block and other equipment.

The opening in the rotary table that accepts the kelly bushings must be large enough for passage of the largest bit to be run in the hole. A lock on the rotary prevents the table from turning when pipe is unscrewed without the use of tongs.

The words to be memorized:

1. rotary/top drive – привод ротора

2. rotary table – стол ротора

3. drill collar - УБТ (утяжеленная бурильная труба)

4. bail of the swivel – серьга, штроп вертлюга

5. hook - крюк

6. goose neck – горловина вертлюга

7. torque - кручение, крутящий момент

8. to transmit - передавать

9. kelly bushing – вкладыш под ведущую трубу

10. master bushing – основной вкладыш

11. to fit - входить, вставлять

12. to unscrew - отвинчивать

13. tongs–клещи

EXERCISE 2 Answer the following questions.

1. What are the main parts of the rotary system?

2. What is the bail of the swivel attached to?

3. What is the function of the swivel?

4. What is the first section of pipe below the swivel?

5. How is the torque transmitted to the Kelly?

6. What does rotation of a crooked Kelly cause?

7. What does a goose neck provide?

8. Where are the Kelly bushings situated?

9. Why should the Kelly be kept as straight as possible?

10. What does a lock on the rotary prevent the table from?

EXERCISE 3 Find the proper Russian equivalents to the following English terms.

1. hook	1. вертлюг
2. tongs	2. серьга
3. swivel	3. горловина вертлюга
4. bail	4. ведущая труба
5. drill collar	5. кручение
6. goose neck	6. основной вкладыш
7. rotary drive	7. крюк
8. master bushing	8. УБТ
9. Kelly	9. клещи
10. torque	10. привод ротора

EXERCISE 4 Memorize the following word combinations, give their Russian equivalents.

Rotary system, bit rotation, load capacities, rotary table, crooked Kelly, whipping motion, Kelly bushing, unscrew with tongs.

EXERCISE 5 Complete the sentences.

1. The rotary system includes…

2. …to the hook of the travelling block.

3. The goose neck provides…

4. Kelly bushings fit…

5. Rotary drilling rigs are used…

6. Rotation of a crooked Kelly…

7. A lock on the rotary prevents the table…

8. The opening in the rotary table must be large enough…

9. Kelly must be kept…

10. The Kelly is…

EXERCISE 6 Describe the rotary system using the following plan and discuss in dialogs with your group mates this theme.

Plan:

1. The main parts of the rotary system.

2. The swivel and the bail of the swivel.

3. The Kelly.

4. A lock on the rotary.

EXERCISE 7 Prepare a presentation about the rotary system.