Week 2 Halliburton Ttp
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This quiz will deal with a few different components in the study of sound, with specific reference to wave velocity, acoustic porosity, transmitters, Delta-T, P-wave, voltage, vertical resolution and electrode devices. See how much you know about it!
- 1.What type of wave travels fastest through a formation?
- A.
Shear
- B.
Mud
- C.
Surface
- D.
Compressional
- 2.Acoustic porosity services are NOTcapable of recording acoustic waves in
- A.
Air-drilled holes
- B.
Oil-based mud
- C.
Freshwater-based mud
- D.
Saltwater-based mud
- 3.Which of the following is not considered a body wave?
- A.
Shear wave
- B.
Compressional wave
- C.
Stoneley wave
- 4.What does Delta-T represent?
- A.
The time required for sound to travel from the transmitter to a receiver.
- B.
The time required for sound to travel through a one foot interval of formation.
- C.
The distance traveled by a direct wave from the transmitter through the formation and detected at the receiver.
- 5.Which of the following is not a practical advantage of increasing offset between transmitter and receiver?
- A.
Potential for deeper depth of investigation beyond the altered zone
- B.
Enables accurate data acquisition in large diameter boreholes
- C.
Enables faster logging speeds
- 6.What effect do slots cut into the tool housing have on tool mode waves?
- A.
Increased velocity
- B.
Decreased travel times
- C.
Increased travel times
- D.
Decreased velocity
- 7.Compressional detla-T (Δtc) _____________ as formation porosity increases.
- A.
Remains constant
- B.
Decreases
- C.
Increases
- 8.Select all of the following that are considered body waves..
- A.
Mud Waves
- B.
Compressional Waves
- C.
Stoneley Waves
- D.
Leaky Mode
- E.
Shear Waves
- 9.Compressional detla-T (Δtc) is proportional to the reciprocal of P-wave velocity.
- A.
True
- B.
False
- 10.Depth-derived borehole compensation used by the Long Spaced Sonic compensates for both tools tilt and washouts.
- A.
True
- B.
False
- 11.Compressional wave velocity is a function of the elastic properties and bulk density of the medium through which it travels.
- A.
True
- B.
False
- 12.The BCDT compensates for the effects of tool tilt and washouts.
- A.
True
- B.
False
- 13.The distance between transmitter and receiver is known as:
- A.
Offset
- B.
Spacing
- C.
Arrival
- 14.Acoustic porosity provides a measure of the effective porosity of the formation.
- A.
True
- B.
False
- 15.A cycle skip is when P-wave first arrivals at two receivers are selected on different cycles of the waveform.
- A.
True
- B.
False
- 16.Which of the following is the DFL's depth of investigation?.
- A.
24 inches
- B.
17 inches
- C.
12 inches
- D.
10 inches
- 17.Select all the potential applications of the DFL measurement when combined with the HRID measurement.
- A.
Measure formation porosity
- B.
Qualitative estimation of permeability
- C.
Measure resistivity of the drilling fluid
- D.
Determination of flushed zone water saturation
- E.
Estimation of diameter of invasion
- 18.The physical law which states that resistivity is directly proportional to voltage and inversely proportional to current is:
- A.
Ampere’s law
- B.
Ohm’s law
- C.
Faraday’s law
- D.
Mitchell’s law
- 19.On the DFL, bucking current (BC) is:
- A.
Emitted from the Ao electrode and returns to the upper and lower A1 electrodes.
- B.
Emitted from the Ao electrode and returns to the current return electrode.
- C.
Emitted from the current return electrode and returns to the Ao electrode.
- D.
Emitted from the upper and lower A1 electrodes and returns to the Ao electrode.
- 20.On the DFL, measure current (MC) is:
- A.
Emitted from the A0 electrode and returns to the upper and lower A1 electrodes.
- B.
Emitted from the current return electrode and returns to the A0 electrode.
- C.
Emitted from the A0 electrode and returns to the current return electrode.
- D.
Emitted from the upper and lower A1 electrodes and returns to the A0 electrode.
- 21.Measure voltage (VE) and bucking voltage (VB) are measured between:
- A.
The Ao electrode and the current return electrode
- B.
Monitor electrodes positioned along the HRID sonde assembly
- C.
The Ao electrode and the upper and lower A1 electrodes
- D.
Receiver coils within the HRID sonde assembly
- 22.What is the vertical resolution of the DFL?
- A.
< 17 inches
- B.
< 10 inches
- C.
< 12 inches
- D.
< 5 inches
- 23.An electrode device such as the DFL operates by:
- A.
Injecting a voltage into the formation and measuring a current between two electrodes.
- B.
Inducing a current into the formation and measuring a voltage between two receiver coils.
- C.
Injecting a current into the formation and measuring a voltage drop between two electrodes.
- D.
Inducing a voltage into the formation and measuring a current between two receiver coils.
- 24.A primary objective of logging the Digitally Focused Laterolog (DFL) is to determine:
- A.
Formation water resistivity (Rw)
- B.
True resistivity of the uninvaded formation (Rt)
- C.
Mud filtrate resistivity (Rmf)
- D.
Flushed zone resistivity (Rxo)
- 25.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 determine a value for true resitivity of a formation.
- C.
The DSNT is often used as a quantitative estimate of permeability.
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