Dual Spaced Neutron Measurement Principle

38 Questions | By Jtodlozil | Updated: Mar 20, 2022 | Attempts: 164

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Dual Spaced Neutron Measurement Principle - Quiz

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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