NGWA page 6 Exam with verified detailed solutions

NGWA page 6 Exam with verified detailed solutions ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




What causes differential sticking? How can you best control against it happening? - correct
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answer✔✔Differential sticking occurs when a drill pipe gets stuck against the walls of the ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




borehole.
maintain proper mud weight, ensure good hole cleaning to prevent cuttings buildup, monitor for ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




pressure changes, and use drilling techniques that minimize contact between the pipe and the
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borehole wall ||\\//||




What are bentonite materials? - correct answer✔✔Bentonite materials are clay minerals rich in
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montmorillonite, known for their absorbency and swelling properties, commonly used in drilling ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




fluids and various industrial applications.
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Gel-strength refers to what property in drilling fluid? - correct answer✔✔the ability of drilling ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




fluid to develop a gel-like consistency when at rest, which helps prevent the settling of solids and
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supports the weight of the drill string during pauses in drilling. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Two holes drilled with mud rotary in the same rock formations have different penetration rates.
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Explain the probable causes. - correct answer✔✔variations in bit type, weight on bit, rotary speed,
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drilling fluid properties, hole cleaning efficiency, and the presence of fractures or other geological
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inconsistencies.


How do you measure high solids in drilling muds? What methods are used to control solids build
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up? - correct answer✔✔measured using centrifuges to assess density and cuttings volume, while
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control methods include regular monitoring, using shale shakers and centrifuges for removal,
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adding fluid loss additives, and maintaining proper circulation rates
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How best can you determine a highly permeable rock formation? - correct answer✔✔Best be
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determined through well tests, such as pumping tests or slug tests, which measure the rate of water ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




flow and drawdown in observation wells.
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