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fundamentals of oil & gas engineering.doc
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9. Look through the texts and give your definitions of the following words:

  • Overworking the bit

  • Shock load

  • Round trip

  • Horsepower

  • Rig

10. Agree or disagree with the following statements:

  1. An increase in either bit weight or rotary speed will increase the rate of penetration.

  2. Bit weight and rotary speed are usu­ally applied in direct proportion to each other.

  3. Most soft, shaly formations don’t respond to varia­tions in rotary speed.

  4. In hard formations, heavy weights (5,000-10,000 psi bit diameter) are required for the bit's crushing-chipping action.

  5. Additional drill collars are heavy and hard to handle in the derrick and at the rotary, they require extra handling time on round trips but they are cost effective.

  6. Long-tooth bits require less horsepower than do short-tooth bits for the same formations.

  7. If centrifugal forces are severely unbalanced, hole friction will increase and the bit may wear unevenly.

  8. The level of energy (weight and rpm) imposed on insert bits is generally higher that that required on steel-tooth bits to avoid insert chippage and breakage.

  9. With smooth running, proper hydraulics, and optimum weight, diamond bit drilling rates usually increase in inverse proportion to rotary speed.

11. Complete the following sentences:

  1. The mechanical factors of bit weight and rotary speed must be ...

  2. And since least-cost drilling is the objective ...

  3. The shearing action of soft-formation bits ...

  4. The capability of the rig must be considered in ...

  5. Increased weight and rpm increase rotary torque which means that ...

  6. The combined factors of high rotary speed, rotary torque, and extreme weight on bit can create ...

  7. Improvements in insert grades and shapes have allowed for ...

  8. The value of diamond bits and the nature of their cutting action require ...

12. Scan the text and think of the possible questions you can ask about weight on bit and rotary speed. Write them down and then ask your groupmates to answer.

13. Summarize the information from the text and tell about special consideration taken into account to enhance drilling situation.

Rate of Penetration Control

1. Before reading the text, study the vocabulary:

drilling rate recorders

записывающая аппаратура для измерения скорости проходки

kelly

ведущая бурильная труба

sufficient

достаточный

drill-off test

пробное бурение; исследование режима бурения в скважине

drill stem

бурильная колонна

to slack off

ослаблять

crown block

кронблок

increment

приращение; прирост; увеличение

2. Pay attention to the abbreviation used in the text:

lb (pound) - фунт (453,6 г)

3. Write down the transcription of the following words and practise their pronunciation:

  • measure

  • automatic devices

  • rough

  • technique

  • circulation

  • variables

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