This is an academic lecture for Diploma in Engineering 7th Semester Mining and Mine Survey Technology. The Course related to this presentation is Drilling bit design.

1. WELCOME TO THE STUDENTS
7th Semester (Mining)
Bogura Polytechnic Institute, Bogura.
Md. Majedur Rahman
B. Sc (Hon’s), M. Sc in Geology & Mining, RU
Instructor (Tech)
Mining and Mine Survey Technology
Bogura Polytechnic Institute, BOGURA.
Presented By
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2. Petroleum Well Design & Completion
Course Code No. 69372
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3. Chapter-05
Understand the drilling bit design
5.1 Define drilling bit.
5.2 Describe different types of well drilling bit.
5.3 Define bit hydraulics.
5.4 Selection and evaluation of well drill bit.
5.5 State bit selection processes.
5.6 Describe bit features and its elements.
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4. Drill bits are cutting tools used to remove material to create holes,
almost always of circular cross-section. Drill bits come in many sizes
and shapes and can create different kinds of holes in many different
materials.
A drill bit is what actually cuts into the rock when drilling an oil or
gas well. Capping off the drill string is the drill bit, and encompassing
the drilling process is drilling fluid, which helps to provide buoyancy to
the drill string, lubricate the drilling process and remove cuttings from
the wellbore.
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5.1 Define drilling bit.

5. 5.2 Describe different types of well drilling bit.
The drill bit is an important component in the drill string. The bit drills the rock in
many mechanisms. The drilling bit is selected according to the formation to be
drilled. The bit performance is related to several operating parameters like: weight
on bit, revolution per minute, mud properties and hydraulic efficiency.
Bit are mainly three types; such as
1. Drag Bit
2. Roller Cutter Bit
3. Diamond Bit
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On the other hands many types of bit are present
• Typical tri-cone rock bit
• Tri-cone rock bit (medium worn-out)
• PDC bit for well drilling
• Multiple Tri-cone (carbide) insert Bits
• Tri-cone (carbide) insert Bit
• Tri-cone rock Bit
• Damaged Drill Bit, broken carbide inserts

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7. Bit hydraulics is related to the effects of nozzle sizes, number of
nozzles, the jet velocity of drilling fluid passing through the bit nozzle,
and the pressure loss across the bit. Optimized hydraulics reduces the
overall drilling cost.
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5.3 Define bit hydraulics.

8. 5.4 Selection and evaluation of well drill bit.
Even though our goal is to make the best preparation at the well planning stage, in
industrial practice, the final bit selection is conducted in the field. The drilling engineer
should be able to select properly, operate and evaluate the drill bit. It is not an easy
task, considering diversification of drilled rocks and wide range of available tools. There
is no particular rule that ensure adequate bit choice. However, using several practical
methods the right bit can be chosen with a fair degree of certainty. Ultimately, the
personal experience is invaluable as well as an opportunity to compare the offset data
in the area.
Its depends on the some factors
• Through assessment and comparison of offset data
• Bit run cost
• Specific energy
• ROP models
• Perfect – Cleaning Model
• Imperfect – Cleaning Model
• Drill-off test
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9. 5.5 Describe bit features and its elements.
The bit file describes the type of bit and its parameters. Similar to the
previous types, also this file has been created for sections Sesam 12 ¼”
and Sesam 8 ½”. As in the lithology file, it has been necessary to make
an assumptions. Since the Hughes Christensen Kymera hybrid bit is a
new solution, it has not been implemented in DROPS software. As a
result of consultation, the most accurate approximation is the choice of
Tricone bit with IADC code 537.
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10. The simulator includes the following bit features:
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Bit Type – (N/A)
IADC Code – (N/A)
Bit Diameter – (Inch)
TVD In – (Meter)
TVD Out – (Meter)
MD In – (Meter)
MD Out – (Meter)
Wear In - (N/A)
Wear Out - (N/A)
Cost – (US Dollars) Cost
DHM – (US Dollars/ Day)
Manufacturer - (N/A)
Bit Description - (N/A)
Nozzle1..Nozzle8 – (1/32 Inch)
Primary Number of Cutters - (N/A)
Backup Number of Cutters - (N/A)
Primary Cutter Size - (Inch)
Backup Cutter Size - (Inch)
Primary Backrake – (Degree)
Backup Backrake - (Degree)
Primary Siderake - (Degree)
Backup Siderake - (Degree)
Number of Blades - (N/A)
Junk Slot Area – (Inch2 )
Thickness – (1/64 Inch)
Exposure - (Inch)
Distance - (Inch)

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13. Any Questions
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14. THANKS TO ALL
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