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CASE HISTORY
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Talon PDC Bit with Dual-chamfer Cutter Technology and
AutoTrak V Automated RSS Saved 5.7 Days of Rig Time
Location: Kazakhstan
8800
Depth In 8,858 , MD Planned
Results
Actual
nnDrilled
1,946 ft (593 m),
4% farther than plan required
9300
Depth, ft
nnDrilled
an average ROP of
32.8 ft/hr (10 m/hr), 250% faster
than impregnated bits, and
37% faster than the offset average
8½-­‐in Sec8on Run1: Talon Bit 8½-­‐in T508X 9800
nnSaved
5.7 days of drilling time
and an estimated USD 240,000
nnAttained
vertical trajectory
according to plan
10300
10800
nnGenerated
larger cuttings for
lithology evaluation
5.7 Days Rig Time Saved Depth Out 10,803 , MD Days
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
Challenges
nnImprove
Challenged by an application that consisted
of anhydrite and hard interbedded carbonate
formations with extended chert inclusions, an
operator in Kazakhstan sought a bit solution
that would not only provide durability, but
also maintain higher speeds than that seen
with diamond impregnated bits.
The unconfined compressive strength (UCS)
of the formation typically ranged from 10,000
to 20,000 pounds per square inch (PSI), but
would spike up to 35,000 PSI when chert was
encountered. Typically, PDC bit cutters would
experience excessive damage when drilling
the chert, so Baker Hughes recommended
its heavy-set, eight-bladed 8½-in. Talon™
high-efficiency PDC bit fortified with
dual-chamfer cutter technology to tackle
the varying formations.
Talon 8½-in. PDC bits with dual-chamfer cutter
technology, with their stable design, durable
profile, and efficient cutting structure, provided
the strength and speed to outpace competitor
impreg bits, hybrid bits, and PDC bits with
conical diamond cutters in this difficult chert
formation. The Baker Hughes AutoTrak™ V
automated rotary steerable drilling system
(RSS) ensured the bottomhole assembly would
stay on trajectory and drill a vertical hole.
The goal for the first run of the section was
to drill 1,870 ft (570 m) until chert content
reached 10% with a target rate of penetration
(ROP) of 26 ft/hr (8 m/hr). The beginning
section of 295 ft (90 m) consisted of hard
plastic anhydrite. Following that was a
656 ft (200 m) section through interbedded
and hard carbonate formations with chert
levels of up to 60%. Total distance drilled
ROP and drilling efficiency
in formation of hard anhydrites
along with interbedded hard
carbonates that included up to
60% concentration of chert
Baker Hughes solution
nnHeavy-set Talon
PDC bit with
dual-chamfer cutters, specifically
designed by Baker Hughes’ DART
Application Review Team
nnThe
Baker Hughes AutoTrak™ V
automated rotary steerable
drilling system
CASE HISTORY
reached 1,946 ft (593 m), a 4% improvement
over the plan. The rate of penetration (ROP)
drilled was 32.8 ft/hr (10 m/hr), a 250%
increase over previous impregnated drill bit
runs, and an increase anywhere from 110% to
200% over competitor PDC type drill bits.
The Talon PDC bit also provided the added
benefits of creating larger cuttings than
previous impreg bit runs for better lithology
identification. The bit also required less
weight on bit, reducing torque and mitigating
bottomhole assembly damage.
Together, the Talon PDC bit with dual-chamfer
cutters and the AutoTrak V automated RSS
saved the client 5.7 days of rig time that
equated to an estimated USD 240,000.
8000
0
10
ROP, ft/hr
20
30
40
Talon with
Dual Chamfer
Cutters
MD, ft
9000
10000
11000
Baker Hughes Talon PDC bit
Competitor PDC bit
Competitor hybrid bit
Impreg bits
12000
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© 2015 Baker Hughes Incorporated. All rights reserved. 42395 02/2015