When sand seams appear during air rotary drilling in an unconsolidated deposit,
what safety measures need to be taken? The ANSWER 1. A decrease in air
pressure
2. Utilizing Polymers or Foam
3. Keep an eye on cuttings
4. Advancement of Casing
5. Slow Rate of Drilling
How are samples taken from unconsolidated formations using air rotary
drilling? ANSWER Continuous Cutting Sampling:
Split-spoon Drilling Fluid/Polymer Sampling
With air rotation, the rates of penetration and hole cleaning will change. What
elements influence penetration and cleaning? The ANSWER Volume and Air
Pressure
Establishment Type
Condition and Bit type
Injection of Drilling Fluid
Cutting Size and Volume Drill Pipe Dimensions and Depth
Why is geological information crucial for appropriate grouting and
unconsolidated formations? The ANSWER The Formation's Permeability
The Formation's Stability
Pressure of Formation
Composition of Groundwater Flow Formation
When would you fill a well with gravel? The ANSWER To improve water
flow by stabilizing the borehole and to keep sand or other fine debris out of the
well when the formation is unconsolidated
Which forms work best with a soft tri-cone bit? ANSWER : Shale, sand, or
clay.
what safety measures need to be taken? The ANSWER 1. A decrease in air
pressure
2. Utilizing Polymers or Foam
3. Keep an eye on cuttings
4. Advancement of Casing
5. Slow Rate of Drilling
How are samples taken from unconsolidated formations using air rotary
drilling? ANSWER Continuous Cutting Sampling:
Split-spoon Drilling Fluid/Polymer Sampling
With air rotation, the rates of penetration and hole cleaning will change. What
elements influence penetration and cleaning? The ANSWER Volume and Air
Pressure
Establishment Type
Condition and Bit type
Injection of Drilling Fluid
Cutting Size and Volume Drill Pipe Dimensions and Depth
Why is geological information crucial for appropriate grouting and
unconsolidated formations? The ANSWER The Formation's Permeability
The Formation's Stability
Pressure of Formation
Composition of Groundwater Flow Formation
When would you fill a well with gravel? The ANSWER To improve water
flow by stabilizing the borehole and to keep sand or other fine debris out of the
well when the formation is unconsolidated
Which forms work best with a soft tri-cone bit? ANSWER : Shale, sand, or
clay.
