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fundamentals of oil & gas engineering.doc
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10. Complete the following sentences:

    1. In the course of drilling a well, the composition of the mud can be changed in order to ...

    2. Lower hydrostatic pressure allows formation rock chips ...

    3. When a chip hold-down effect is created mechanical energy on the bit must be increased to ...

    4. Stuck pipe and pressure surges caused by ...

    5. Heavy-­weight mud is necessary in cer­tain drilling situations when without sufficient hydrostatic pressure ...

    6. Low-solids fluid (water, where feasible) will enable faster penetration rates than ...

    7. Fine solids in the mud contribute to ...

    8. A high-viscosity sweep, operation when a quantity of high-viscosity mud is circulated through the system, is a good way to ...

    9. The pressure of the mud column may force ...

    10. Oil in the mud ...

11. Answer the questions:

  1. What functions does drilling fluid perform?

  2. What mud properties have the greatest effect on penetration rate?

  3. Why does lightweight mud permit fast drilling?

  4. What happens when mud density is too high?

  5. How can you prove that the use of low-weight muds when possible is a definite cost saver?

  6. What are the best ways to prevent blowouts?

  7. What drilling situations is low-solids mud used in?

  8. What detrimental effect on rate of penetration can small particles of weighting material in the mud have?

  9. How can solids content be kept low?

  10. What can increases in mud’s viscosity cause?

  11. What ways is water loss beneficial in?

  12. What problems can excessive fluid loss create?

12. Work in groups. Choose one of the characteristics that affect the rate of penetration and write down true/false statements. When everyone is ready, exchange your statements and ask your groupmates to express their points of view. Ask them to prove why they agree or disagree with your statement.

13. Speak about mud characteristics and the way they affect the penetration rate.

Air Drilling

1. Before reading the text, study the vocabulary:

high-speed photographs

высокоскоростная съемка

liter­ally

буквально

to explode

взрываться

rig time

время бурения (для расчета коммерческой скорости)

protective casing

колонна-направление; техническая обсадная колонна

to justify

оправдать

foaming agent

пенообразователь

power output

производимая мощность

standpipe

водонапорная труба

rotating head

уплотнитель ведущей штанги

annulus

затрубное пространство

blowout preventer (BOP)

противовыбросовое оборудование

flow line

выкидная линия (для разбуренной породы при бурении с очисткой забоя воздухом или для отвода газообразного бурового агента)

fire-extinguishing equipment

противопожарное оборудование

discharge valve

нагнетательный клапан

reciprocating compressor

поршневой компрессор

stiff

плотный

silicon tetrafluoride

тетрахлорид кремния

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