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4. Give the adequate Russian variants for the following word combinations:

To make a correct appraisal of the rock concerned; the form and distribution of the grains; to determine how heavy the tool wear will be; the hardness of rock’s constituent mine­rals; to cause heavy wear on the drill bits; to enhance drilling capability and endurance; bit replacement costs; rocks with essentially the same mi­neral content; to be quite different as regards drillability; to fail under the applied stress of the drilling mechanism; pressure from the overburden; inclined and layered formations; to cause drilling tools to get stuck; the reaction of a formation material as it comes in contact with drilling mud; water-base muds.

5. Find the English equivalents for the following words and word combinations:

Прогнозировать результаты бурения; определять скорость проходки; износ долота; буримость породы; увеличить производительность бурения; сократить время спускоподъемных операций; вызывать большой/незначительный износ оборудования; большое содержание минерала; сопротивляться геофизическим нагрузкам; нагрузка на долото; перепад давления; способствовать быстрому бурению; покрывающий слой; пористость; проницаемая горная порода; искривление скважины; застревать; очистка забоя; образовывать сальник на долоте.

6. Match the words with their definitions and give their Russian equivalents:

  1. aquifer

    1. the most frequently occurring fine-grained sedimentary rock composed of consolidated silt and clay or mud.

  1. formation fluid

    1. a loosely arranged, apparently unstratified section of rock.

  1. shale

    1. the difference between two fluid pressures; e.g. the difference between the pressure in a reservoir and in a wellbore drilled in the reservoir.

  1. unconsolidated formation

    1. fluid (such as gas, oil, or water) that exists in a subsurface rock formation.

  1. differential pressure

    1. a layer of rock or sand under the ground that contains water and allows water to pass through it.

7. Look through the texts and give your definitions of the following words:

  1. drillability

  2. overburden

  3. decay

  4. to solidify

  5. fossil fuels

8. Complete the following sentences:

  1. We must make a correct appraisal of the rock in order to ...

  2. Rock properties, such as hardness, abrasiveness, compressive strength and density, determine ...

  3. The drillability of a rock depends on ...

  4. The effects of rock hardness and abrasiveness on rate of penetration require ...

  5. Such features as cone offset and hard-facing should be chosen to ...

  6. A rock's compressive strength is its ability to ...

  7. Porosity usually means ...

  8. Among the macroscopic properties are ...

  9. The reaction of a formation material as it comes in contact with drilling mud can ...

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