PE371 Well Logging: Caliper Log Basics
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Questions and Answers

What is the primary purpose of a gamma ray log?

  • Quality control of log readings (correct)
  • Identify reservoir zones
  • Identify mud cake (permeable zone)
  • Compute volume of borehole

    • In the context of the text, what does a hole being 'on gauge' mean?

  • Circular hole shape (correct)
  • Round hole shape
  • Washed out hole shape
  • Oval hole shape

    • Why can the gamma ray log be badly affected in intervals that suffer from caving?

  • Higher gamma rays emitted by caving
  • Decreased drilling mud between formation and detector
  • Loss of signal due to caving
  • Increased drilling mud between formation and detector (correct)

    • What does a caliper log show when the hole size is lower than the bit size?

    <p>Presence of mud cake</p> Signup and view all the answers

    Why is a four arm caliper log preferred over a single caliper for interpreting borehole shape?

    <p>Provides better definition of the hole shape</p> Signup and view all the answers

    What is the significance of the hole size being lower than the bit size in a caliper log?

    <p>It indicates the presence of a mud cake and a permeable zone</p> Signup and view all the answers

    What is the role of the caliper arm in a caliper log?

    <p>It measures the hole diameter and pushes the density sensor on the borehole wall</p> Signup and view all the answers

    What is the implication when the actual hole size is higher than the bit size in a caliper log?

    <p>It indicates the presence of a caving or washout</p> Signup and view all the answers

    What is the significance of a permeable zone in petroleum engineering?

    <p>It is the first job of a petroleum engineer to identify permeable zones as only permeable rocks can be reservoirs</p> Signup and view all the answers

    What is the role of the caliper log in quality control of other logs?

    <p>It helps in identifying if the hole size is larger at a particular depth, which can make the log readings unreliable</p> Signup and view all the answers

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