Spectral Density Logging Tool Measurement Principle Electrical Engineering

33 Questions

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Electrical Engineering Quizzes & Trivia

Questions and Answers
  • 1. 
    Select all of the following applications of the SDLT.
    • A. 

      Determine the volume of shale

    • B. 

      Measure formation permeability

    • C. 

      Identification of gas bearing formations

    • D. 

      Estimation of formation true resistivity

    • E. 

      Estimation of hydrocarbon density

    • F. 

      Determine formation porosity

    • G. 

      Determine lithology

  • 2. 
    Select all of the following that apply to scintillation detectors.
    • A. 

      Crystal is composed of sodium chloride NaCl

    • B. 

      Scintillation crystal coupled to a photo multiplier tube

    • C. 

      Gamma rays interact with the scintillation crystal

    • D. 

      Electrons pass through high voltage fields to produce several secondary electrons

    • E. 

      Electrons are ejected from the photo multiplier tube

  • 3. 
    Lithology can be determined from
    • A. 

      Photoelectric factor

    • B. 

      Tortuosity factor

    • C. 

      Cementation exponent

    • D. 

      Saturation exponent

  • 4. 
    The SDLT cannot acquire accurate data in
    • A. 

      Cased Hole

    • B. 

      Freshwater-based mud

    • C. 

      Saltwater-based mud

    • D. 

      Air-drilled holes

  • 5. 
    The SDLT employs a 1.5 Curie chemical source of ________ to emit a continuous stream of gamma rays
    • A. 

      Cesium-137

    • B. 

      Americium/Beryllium

    • C. 

      Cobalt 60

    • D. 

      Thorium

  • 6. 
    Which of the following statements is true?
    • A. 

      Energy loss in gamma rays can be related to physical characteristics of the formation

    • B. 

      Gamma rays interacting with electrons in formation gain energy

  • 7. 
    Gamma rays may be absorbed by an electron when their energy level reaches 
    • A. 

      100 keV

    • B. 

      1000 keV

    • C. 

      10,000 keV

  • 8. 
    The binding energy of inner shell electrons is greater than outer shell electrons and increases proportionally to the atomic number of the nucleus.
    • A. 

      True

    • B. 

      False

  • 9. 
    The energy loss experienced by a gamma ray in a collision with an outer shell electron is dependent on the rock's molecular composition.
    • A. 

      True

    • B. 

      False

  • 10. 
    What happens when a low energy (<100 keV) gamma ray interacts with the inner shell electron?
    • A. 

      The electron absorbs the gamma ray and is ejected from its shell

    • B. 

      The electron is displaced to an outer shell

    • C. 

      The electron remains in an unchanged state

  • 11. 
    Which of the following best describes Compton scattering?
    • A. 

      Higher energy (>100 keV) gamma rays collide with an outer shell electron and transfers some of its energy to that electron.

    • B. 

      Higher energy (>100 keV) gamma rays collide with an inner shell electron causing the electron to move to an outer shell

    • C. 

      Low energy (

    • D. 

      Low energy (

  • 12. 
    Energy levels of greater than ________ are used to obtain a formation's bulk density.
    • A. 

      100 keV

    • B. 

      1 MeV

    • C. 

      1000 keV

    • D. 

      10,000 keV

  • 13. 
    When a low energy gamma ray collides with the inner shell electron and transfers its entire energy to that electron, which of the following occurs?
    • A. 

      Photoelectric absorbsion

    • B. 

      Compton scattering

    • C. 

      Scintillation

  • 14. 
    How many detectors does the SDLT employ?
    • A. 

      2

    • B. 

      1

    • C. 

      3

    • D. 

      4

  • 15. 
    Bulk density and photoelectric factor measurements are processed using windows W1 through W4.
    • A. 

      True

    • B. 

      False

  • 16. 
    Which of the following curves represents corrections applied to bulk density for lithology?
    • A. 

      CORM curve

    • B. 

      CORP curve

    • C. 

      RHOB curve

  • 17. 
    Which of the following curves represents corrections applied to bulk density caused by stand-off?
    • A. 

      CORM curve

    • B. 

      CORP curve

    • C. 

      RHOB curve

  • 18. 
    What correction is applied to the bulk density measurement for a washout?
    • A. 

      Positive

    • B. 

      Negative

    • C. 

      No change

  • 19. 
    What correction is applied to the bulk density measurement for barite mudcake?
    • A. 

      Positive

    • B. 

      Negative

    • C. 

      No Change

  • 20. 
    Stand-off refers to
    • A. 

      Any physical separation between a detector and formation

    • B. 

      Distance between source and short-spaced detector

    • C. 

      Physical distance between the short-spaced and long-spaced detector

    • D. 

      Distance traveled by gamma rays from the source to the point at which it is absorbed

  • 21. 
    The SDLT can acquire accurate data in
    • A. 

      Cased Hole

    • B. 

      Freshwater-based mud

    • C. 

      Saltwater-based mud

    • D. 

      Air-drilled holes

  • 22. 
    The Spectral Density Logging Tool (SDLT) is designed to measure the electron density and gamma ray absorption properties of a formation.
    • A. 

      True

    • B. 

      False

  • 23. 
    Gamma rays emitted from the cesium-137 source have an initial energy of _____ KeV.
    • A. 

      662

    • B. 

      62

    • C. 

      6,662

  • 24. 
    At higher energy levels (>100 KeV), gamma rays interact with ____ shell electrons of atoms.
    • A. 

      Outer

    • B. 

      Inner

  • 25. 
    At lower energy levels (<100 KeV), gamma rays interact with ____ shell electrons of atoms.
    • A. 

      Outer

    • B. 

      Inner

  • 26. 
    Interactions with outer shell electrons are ___________.
    • A. 

      Lithology-independent

    • B. 

      Lithology-dependent

    • C. 

      Porosity-independent

    • D. 

      Porosity-dependent

  • 27. 
    Interactions with inner shell electrons are ___________.
    • A. 

      Lithology-independent

    • B. 

      Lithology-dependent

    • C. 

      Porosity-independent

    • D. 

      Porosity-dependent

  • 28. 
    The SDLT employs ___ scintillation detectors to measure the amount and energy level of scattered gamma rays.
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 29. 
    Measured gamma rays are sorted according to their energy levels into ____ different ranges or windows.
    • A. 

      4

    • B. 

      2

    • C. 

      6

    • D. 

      8

  • 30. 
    Which windows are used to compensate for shifts in the energy spectra that are caused by temperature variations downhole?
    • A. 

      W1-W4

    • B. 

      W2-W5

    • C. 

      W4-W8

    • D. 

      W5-W8

  • 31. 
    Once electron density (ρe) is derived from the count rates, it must be corrected for borehole diameter and mud weight.
    • A. 

      True

    • B. 

      False

  • 32. 
    Which of the following are gamma ray absorbers?
    • A. 

      Iron

    • B. 

      Barite

    • C. 

      Bentonite

    • D. 

      Hydrogen