30 Questions
What is drilling?
A cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section in solid material
What is the primary purpose of drilling in mining?
To create holes for blasting explosives
What is percussive drilling?
A drilling technique in which a drill bit is repeatedly raised and lowered, impacting soil and rock
What is the term for drilling smaller diameter holes?
Drilling
How many methods of drilling are mentioned?
4
What is the primary purpose of the Sandvik DT820 jumbo?
Face drilling and cross-cutting
What is the purpose of drilling in solution mining?
To create boreholes for use in solution mining
What is the typical diameter range of drill rods used in surface drilling?
50 to 150 mm
What is the power source of newer percussive drills for surface mining applications?
Hydraulic drills with diesel power
What is the typical range of drilling rates for surface percussive drills?
2 to 80 m/h
What is the typical weight loading on the bits in surface drilling?
1 to 4 t
What is the typical range of hole sizes for percussive drilling in surface blasting?
89 to 150 mm
What is the maximum depth of the Sandvik DR416i blasthole drill across all recommended pipe diameters?
42.4 m
What is the diameter range of blastholes that tricone bits are commonly used for?
150-444 mm
What is the main advantage of PDC drag bits over tricone bits?
They allow for longer intervals between bit changes
What is the primary consideration for selecting the proper bit for rotary drilling?
Rock type and operational requirements
What is the name of the company that introduced tricone bits in the early 1900s?
Hughes Tool Company
What is the primary type of drilling that the Sandvik DR416i is intended for?
Rotary drilling
What is the purpose of the interfaces in multiboom jumbo drills?
To compare the current drilling rates with stored data for drilling in similar rock types
What is the role of the rotary bits in directional drilling?
To receive the thrust force and torque reaction from the drill string
What is the advantage of using coil tubing in oil/gas well drilling?
It eliminates the need for breaking and assembling the drill steels
What is the minimum radius of bend possible with directional drilling?
6-10 m
What is the purpose of the automated surveying and guidance system in multiboom jumbo drills?
To coordinate with the drill to achieve the desired blasthole patterns
What is the role of the bent sub in directional drilling?
To effect direction changes
What is the primary purpose of cable bolts in drilling operations?
To provide ground support
What type of bit front face is more suitable for creating a straighter hole?
Flat or concave
What is the advantage of using larger-diameter drill strings in drilling operations?
It reduces the deviation from the proper location
What is the limitation of using a noncoring drill in drilling operations?
The drill string cannot be the same diameter as the bit
What is the purpose of the retrac bits with long bit skirts?
To improve drilling accuracy and reduce hole deviation
What is the feature of the Sandvik DT820 jumbo that allows for fast and accurate tunneling and cavern excavation?
Its two-boom electrohydraulic design
Learn about the different drilling techniques, including percussion, rotary, churn, and diamond drilling. Understand the process and applications of each method.
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