American Oil and Gas Reporter - September 2015 - 105

SpecialReport: Tubulars Technology
FIGURE 4
Vibration versus Depth Comparision for All Six Wells

Developing on- and off-bottom procedures offered improved control of the
lateral dysfunctions, and resulted in significantly improved drill bit longevity.
The well site experts trained the drillers
in these procedures and monitored the
real-time data to ensure proper implementation.
On the third well, an aggressive bit
was used that produced high reactive
torque from the mud motor (stick-slip).
Well site experts decreased WOB and
increased the flow to minimize vibration.
After a number of stick-slip events, the
bit became worn and had to be pulled
before total depth was reached. Figure 3
defines the stick-slip as effects of the
motor's reactive torque caused by minimum rpm reaching negative 100 and
maximum rpm exceeding 500. Also note
the increase of MSE and high-frequency
strain throughout the log, indicating inefficient drilling and increased bit wear.
A similar style of bit again produced
high levels of stick-slip, and downhole
MSE was high throughout the entire run,
indicating the rig was unable to provide
the required drilling parameters with only
110 rpm to overcome the bit's aggressiveness to properly destroy the rock.
Consequently, the use of this aggressive
style of bit was discontinued, since the
accelerated bit wear had the opposite of
the intended effect.

were exacerbated by pumping sweeps,
which changed the buoyancy of the string.
With the downhole WOB, corrections to
the surface were done quickly to enhance
the drilling system's performance.
Too much WOB could cause the motor
to stall or induce stick-slip, thereby increasing bit wear. On the other hand, too
little WOB obviously would cost the operator additional time, given a slower
rate of penetration, in addition to subjecting

the BHA and bit to whirl events. Torsional
and loading events could cause cutter
loss and ring-outs. ECD measurements
from the dynamics tool showed good
hole cleaning and allowed the number of
sweeps to be reduced safely.
The downhole dynamics tool was expanded to include the 83⁄4-inch vertical
hole section of the last well prior to the
kickoff point for the lateral section.
Changes to the bit design based on feedback from the downhole data enabled
drilling the entire 105⁄8- and 83⁄4-inch hole
sections in single-bit runs.
Over the course of the six-well campaign, real-time interpretation of downhole
dynamics data (along with creating detailed
drilling procedures) continually increased
bit life and controlled damaging events
to allow vertical sections to be drilled
with one bit. Using these combined solutions saved the operator 24 percent of
projected well costs, and provided invaluable learnings for drilling new wells.
The vibration versus depth data in Figure
4 illustrate the progression of the continued
improvement while drilling all six wells.
The best practice identified for putting
the bit on and off bottom included starting
the drill string rpm at 15-20 when off
bottom and then bringing the pumps up

FIGURE 5
Increasing RPM/Decreasing WOB in Response to Rising Inclination
(Pendulum Assembly Returns Well to Vertical)

More Efficient Drilling
Monitoring downhole WOB allowed
much more efficient drilling. There were
numerous errors of zeroing the surface
WOB either too little or too much at a connection or when coming off bottom. These
SEPTEMBER 2015 105



American Oil and Gas Reporter - September 2015

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Contents
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