American Oil and Gas Reporter - April 2022 - 69

SpecialReport: Drilling Assemblies
Learning from every run is key, concurs
Chad Feddema, TDI's chief technology
officer. " In the past, companies often obtained
data to troubleshoot problematic or
particularly challenging wells, " he recalls.
" That is valuable, but if we also study
why a particular well went right, we can
move faster in the right direction. "
TDI partnered with Sanvean®
Technologies
to develop sensors small enough
to be embedded anywhere in the drill
string, including the mud motor and drill
bit. " The sensors' main use is to understand
high-frequency dynamics so we can determine
why dysfunction occurs and
change drilling inputs to reduce it, " outlines
Steve Jones, Sanvean's president and CEO.
" Historically, shock and vibration has
been measured from the measurementwhile-drilling
tool. These measurements
are useful for seeing how much shock
and vibration goes through the MWD
tool, but do not give an accurate picture
for the whole bottom-hole assembly.
" Placing embedded sensors in the drill
bit and above the motor's power section
provides a completely different perspective, "
Jones contrasts. " With high-frequency
data, we can optimize input parameters,
bit selection and motor design
to drill wells faster, more consistently
and with fewer trips. "
Improving U-Joints
The sensors above the mud motor
have clarified the link between stick slip
and u-joint failure, says Sheldon Ritchie,
TDI's chief operating officer. " When the
bit stalls, today's high-power motors often
rotate backwards, which is extremely
hard on the drive components. In fact,
the cyclical fatigue associated with reverse
rotation is the most common cause of ujoint
failure. "
When motors rotate backwards-an
event called backlash-the universal joint
can disengage from the driving faces
only to re-engage at a high angular velocity,
which subjects drive surfaces to
severe shock loads. These repeated shocks
can cause premature wear or catastrophic
failure, Ritchie warns.
In response, the company has developed
an articulated universal joint with a second
set of drive keys to mitigate backlash.
" These high-torque keys reduce backlash
in the driveline u-joint at all angles of operation, "
Ritchie says. " This is a major
improvement over traditional designs,
which limit backlash when they are straight
but lose effectiveness once they are angled
as little as two or three degrees. "
Had TDI relied solely on MWD sensors,
it never would have realized the
extent of backlash motors were enduring,
Woloshyn reflects. " Sensor placement is
important, " he says. " During multi-axis
drilling dysfunctions, the bit temperature
can be 100 degrees F hotter than the top
end of the motor. A typical MWD sensor
will read lower temperatures, so we should
not rely on it to determine whether other
BHA components have the right temperature
ratings. "
Compound Angle Motor
According to Woloshyn, the embedded
sensors also have helped TDI invent a
compound angle motor that is able to
drill the vertical, curve and lateral with
one configuration. " We designed the
motor to deliver performance approaching
rotary steerable systems at a lower cost
and with much greater reliability down
hole, " he outlines.
Feddema says the motor achieves that
goal by using both an internal and external
bend. " When the motor is sliding, the
compound angle comes into play and the
motor acts like it has a high-bend, which
lets us build aggressive curves, " he explains.
" Once the motor is rotating, it
acts like a low-bend motor because of
the low-degree external bend. This lets
us rotate much faster than a true highbend
motor without added concerns of
fatigue or stress. "
In many applications, the motor has
enabled operators to drill the vertical,
curve and lateral sections in one run,
Feddema reports. He adds that it excels
in high-temperature applications that can
challenge rotary steerable systems, including
Haynesville Shale wells.
Deepening Dull Analysis
For drill bit providers, learning swiftly
is the key to gaining market share, says
Dustin Lyles, vice president of technology
for Taurex™ Drill Bits. " Other drilling
system components are advancing at a
rapid pace. If bit companies want to fully
leverage the torque from modern mud
motors, or the hydraulic energy today's
mud pumps deliver, they must rapidly
and continuously advance designs to accommodate
changes in the drilling system
or lithology, " he says.
" We need to look at every bit that
comes back from a run and ask what it
can tell us about how to do better next
time, " Lyles clarifies. " If we had to analyze
every bit manually, we could only look at
roughly 2%-3% with any depth. So instead,
Taurex developed and patented its automated
metrology laboratory (AML) that
employs a robotic 3-D scanner to quantify
diamond loss on every cutter in each bit. "
When drill bits experience stick-slip, mud motors may rotate backwards. Because such
reverse rotation generates cyclical fatigue that can lead to premature or catastrophic failures,
Turbo Drill Industries Inc. has developed a transmission with a patented secondary
set of drive keys for mitigating backlash. The company says this transmission has been
proven to increase motor reliability and run life.
APRIL 2022 69

American Oil and Gas Reporter - April 2022

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2022

Contents
American Oil and Gas Reporter - April 2022 - Intro
American Oil and Gas Reporter - April 2022 - Cover1
American Oil and Gas Reporter - April 2022 - Cover2
American Oil and Gas Reporter - April 2022 - Contents
American Oil and Gas Reporter - April 2022 - 4
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American Oil and Gas Reporter - April 2022 - Cover3
American Oil and Gas Reporter - April 2022 - Cover4
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