Full Wave Sonic Waveforms Measurement Principle

25 Questions | Total Attempts: 46

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Full Wave Sonic Waveforms Measurement Principle

Questions and Answers
  • 1. 
    The Full Wave Sonic Tool is NOT capable of recording acoustic waves in _______.
    • A. 

      Freshwater-based mud

    • B. 

      Oil-based mud

    • C. 

      Air-drilled holes

    • D. 

      Cased hole

  • 2. 
    The Full Wave Sonic uses a monopole transmitter to convert electrical energy to mechanical energy.
    • A. 

      True

    • B. 

      False

  • 3. 
    Which of the following is an example of a direct wave?
    • A. 

      Mud Wave

    • B. 

      Stoneley Wave

    • C. 

      Compressional Wave

    • D. 

      Shear Wave

    • E. 

      Tool Mode

  • 4. 
    Transmitter to receiver distance is known as.
    • A. 

      Arrival

    • B. 

      Delta T

    • C. 

      Offset

    • D. 

      Spacing

  • 5. 
    How many waveforms are recorded for each FWS transmitter pulse?
    • A. 

      2

    • B. 

      4

    • C. 

      8

    • D. 

      16

  • 6. 
    Which type of wave is the first to arrive at the receiver?
    • A. 

      Compressional

    • B. 

      Shear

    • C. 

      Stoneley

    • D. 

      Mud

  • 7. 
    What effect do slots cut into the tool housing have on tool mode waves?
    • A. 

      Decreased Travel Times

    • B. 

      Increased Travel Times

    • C. 

      Increased Velocity

    • D. 

      Decreased Velocity

  • 8. 
    Which of the following is NOT a characteristic of mud waves?
    • A. 

      Long travel times

    • B. 

      Low amplitude at a receiver

    • C. 

      Short travel times

    • D. 

      Velocity is dependent on borehole fluid

  • 9. 
    Select all of the following that are considered body waves.
    • A. 

      Shear Waves

    • B. 

      Leaky Mode

    • C. 

      Stoneley Waves

    • D. 

      Compressional Waves

    • E. 

      Mud Waves

  • 10. 
    Compressional wave velocity is a function of the elastic properties and bulk density of the medium through which it travels.
    • A. 

      True

    • B. 

      False

  • 11. 
    Shear wave energy causes particle deformation that is ________ to the direction of energy propagation.
    • A. 

      Perpendicular

    • B. 

      Parallel

  • 12. 
    The minimum travel time from the transmitter to a receiver represents a...
    • A. 

      Critically refracted wave

    • B. 

      Reflected Wave

    • C. 

      Totally refracted wave

  • 13. 
    For a body wave to be critically refracted, the velocity of acoustic energy through the formation must be _______ than the velocity of the fluid pressure wave through the borehole.
    • A. 

      Faster

    • B. 

      Slower

  • 14. 
    In formations where shear velocity is slower than the velocity of the fluid pressure wave through the borehole, the FWS monopole transmitter will generate critically refracted shear waves.
    • A. 

      True

    • B. 

      False

  • 15. 
    Select all of the following that are considered surface waves.
    • A. 

      Shear Waves

    • B. 

      Stoneley Waves

    • C. 

      Compressional Waves

    • D. 

      Leaky Mode

    • E. 

      Normal Mode

  • 16. 
    Leaky mode and normal mode waves are used to determine formation properties.
    • A. 

      True

    • B. 

      False

  • 17. 
    __________ waves are surface waves created by the flexing of the interface between the borehole fluid and formation fluid.
    • A. 

      Leaky Mode

    • B. 

      Compound

    • C. 

      Shear

    • D. 

      Stoneley

  • 18. 
    Stoneley wave velocities are not important for the purpose of formation evaluation.
    • A. 

      True

    • B. 

      False

  • 19. 
    Which of the following does Full Wave Sonic (FWS) measure?
    • A. 

      Porosity determination

    • B. 

      Lithology determination

    • C. 

      Identification of gas-bearing formations

    • D. 

      Provides depth correlation for seismic sections

    • E. 

      Qualitative indicator of permeability

    • F. 

      Formation resistivity

  • 20. 
    A particularly beneficial application of compressional and shear wave velocities is the estimation of rock elastic properties such as Poisson’s ratio, Young’s modulus, shear modulus, and bulk compressibility.
    • A. 

      True

    • B. 

      False

  • 21. 
    The FWS can be used to detect the presence of natural fractures.
    • A. 

      True

    • B. 

      False

  • 22. 
    Which of the following conditions can the FWS be used?
    • A. 

      Saltwater based mud

    • B. 

      Freshwater based mud

    • C. 

      Oil based mud

    • D. 

      Cased hole

    • E. 

      Air filled holes

  • 23. 
    The four receivers employed by the FWS are positioned at distances of __ , __ , __ and __ feet from the transmitter.
    • A. 

      9

    • B. 

      10

    • C. 

      11

    • D. 

      12

    • E. 

      13

    • F. 

      14

    • G. 

      15

  • 24. 
    Direct waves travel directly from the transmitter to the receiver.
    • A. 

      True

    • B. 

      False

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