Dual Spaced Neutron Measurement Principle

38 Questions | Total Attempts: 93

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Dual Spaced Neutron Measurement Principle

Questions and Answers
  • 1. 
    Select all of the potential applications of logging the DSNT tool.
    • A. 

      Measure formation porosity

    • B. 

      Measure formation permeability

    • C. 

      Identification of gas bearing zones

    • D. 

      Determine formation lithology

    • E. 

      Determine formation resistivity

  • 2. 
    Select the true statements regarding calibrating neutron tools at Halliburton.
    • A. 

      All tools are calibrated at the API test pit in Houston

    • B. 

      A snow block is used to verify neutron tools at the well site

    • C. 

      A horizontal water tank is used to calibrate neutron tools at the well site

    • D. 

      The standard tool is calibrated at the API test pit in Houston

  • 3. 
    Which of the following is a true statement?
    • A. 

      The DSNT is used to help estimate the volume of shale in a formation when combined with density porosity or sonic porosity

    • B. 

      The DSNT is used to help determine a value for true resistivity of a formation

    • C. 

      The DSNT is often used as a qualitative estimate of permeability.

    • D. 

      Yeeee

  • 4. 
    In which of the following condition is the DSNT not able to provide accurate measurements?
    • A. 

      Air-drilled holes

    • B. 

      Oil-based muds

    • C. 

      Saltwater based mud

    • D. 

      Freshwater-based mud

  • 5. 
    Which of the following is the most efficient element at slowing neutrons?
    • A. 

      Oxygen

    • B. 

      Hydrogen

    • C. 

      Helium

    • D. 

      Kryptonite

  • 6. 
    The radioactive source used by the DSNT consists of which of the following elements.
    • A. 

      Helium and uranium

    • B. 

      Potassium and thorium

    • C. 

      Americium and beryllium

    • D. 

      Protium and tritium

  • 7. 
    Which level can the DSNT detect neutrons?
    • A. 

      10 MeV - 1 MeV

    • B. 

      1 MeV - 10 eV

    • C. 

      10 eV - .1 eV

    • D. 

      Less than .1 eV

  • 8. 
    In an elastic collision the deflected neutron will have a ________ energy level than before the collision.
    • A. 

      Higher

    • B. 

      Lower

    • C. 

      Same

  • 9. 
    Neutrons lose more energy in which type of collision?
    • A. 

      Static

    • B. 

      Direct

    • C. 

      Glancing

    • D. 

      T-Bone

  • 10. 
    Hydrogen causes an energy loss of about ________ in each direct collision with a neutron. 
    • A. 

      10%

    • B. 

      35%

    • C. 

      40%

    • D. 

      50%

  • 11. 
    About how many direct collisions with hydrogen are required to slow a fast neutron to a thermal level?
    • A. 

      10

    • B. 

      18

    • C. 

      46

    • D. 

      105

  • 12. 
    What type of gas is present in a thermal neutron detector? 
    • A. 

      Helium

    • B. 

      Hydrogen

    • C. 

      Argon

    • D. 

      Neon

    • E. 

      Krypton

  • 13. 
    Which of the following statements is true?
    • A. 

      Hydrogen concentration does not influence count rate

    • B. 

      High concentration of hydrogen results in lower count rates

    • C. 

      Low concentration of hydrogen results in lower count rates

    • D. 

      Taylor can throw an orange 1000 feet.

  • 14. 
    What is the name of the part identified by the arrow?
    • A. 

      Collection Anode

    • B. 

      Scintillation Crystal

    • C. 

      Cathode

  • 15. 
    Count rate for the DSNT thermal neutron detector is defined as.
    • A. 

      Number of epithermal neutrons multiplied by 100

    • B. 

      Number of thermal neutrons multiplied by 100

    • C. 

      Number epithermal neutrons detected in one second

    • D. 

      Number of thermal neutrons detected in one second

  • 16. 
    What effect does substituting chlorine and sodium for hydrogen have on the thermal neutron count rate?
    • A. 

      Increases the count rate

    • B. 

      Decreases the count rate

    • C. 

      Does not change the count rate

  • 17. 
    Which of the following statements is true?
    • A. 

      The larger the hole size, the lower the count rate detected

    • B. 

      The larger the hole size, the higher the count rate detected

    • C. 

      Large hole size has no effect on the count rate detected

    • D. 

      Size does matter according to women

  • 18. 
    Stand-off is defined as
    • A. 

      The distance between the tool and the borehole wall

    • B. 

      The centralization of the detector in the borehole

    • C. 

      Any physical separation between a detector and formation

    • D. 

      Someone who doesn't want to talk to anyone

  • 19. 
    Stand-off can be completely eliminated with the use of a decentralizer.
    • A. 

      True

    • B. 

      False

  • 20. 
    Which of the following zero porosity formations has the highest SS/LS ratio?
    • A. 

      Sandstone

    • B. 

      Dolomite

    • C. 

      Limestone

  • 21. 
    The DSNT compensates for the borehole by taking a ratio of the..
    • A. 

      Short spaced detector count rate to the long spaced detector count rate

    • B. 

      Long spaced detector count rate to the short spaced detector count rate

  • 22. 
    As porosity of the formation increases the SS/LS ratio
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Remains the same

  • 23. 
    Which of the following is true?
    • A. 

      Quartz sandstone is characterized by a higher SS/LS ratio than limestone

    • B. 

      The SS/LS ratio increases with increased porosity

    • C. 

      The SS/LS ratio decreases with increased porosity

    • D. 

      Dolomite is characterized by a lower SS/LS ratio than limestone

  • 24. 
    Which statement is true?
    • A. 

      The SS/LS is inversely proportional to formation porosity

    • B. 

      Formation lithology must be known to determine accurate formation porosity.

    • C. 

      Different formation lithologies do not affect the formation porosity.

  • 25. 
    The addition of shale into a given formation would ________ the hydrogen concentration.
    • A. 

      Increase

    • B. 

      Decrease

    • C. 

      Not Change

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