Full Wave Sonic Waveforms Measurement Principle
- 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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