American Oil and Gas Reporter - April 2015 - 140

SpecialReport: Performance Drilling
at which to drill. We recommend drilling
at these differential pressure ranges to
maximize the motor's torque output to
the bit. In addition, a new driller's road
map was created, based on all the lessons
learned from the analysis.
It also is important to implement lessons learned during this analysis to improve drilling efficiency on wells in the
same area or others with similar applications. It is evident from looking at the
depth versus time curve in Figure 12 that
for the first three wells drilled in this
analysis, spud to total depth time was re-

duced between each well.

Key Lessons Learned
Key lessons from this project can be
used to improve drilling performance in
similar applications in other areas.
First, the damage to the cutting structure
and subsequent bit trips for penetration
rate when transitioning from the shale to
the dolomite was caused by the lateral
RMS vibrations that occurred at a high
intensity over an extended period. To
offset this vibration, additional wall contact
from the near-bit stabilizer's gauge reduced

FIGURE 10
Well C2 RMS Lateral Vibration
10
9
8
7

Zone 1

Mov Avg DDDR 1
Mov Avg DDDR 2
Mov Avg DDDR 3

RMS (g)

6

Run
3

Run 2

Run 1

5
4
3
2
1
0
2,500

3,000

3,500

4,000

4,500

5,000

5,500

6,000

6,500
MD (ft)

7,000

7,500

8,000

8,500

9,000

9,500

10,000

10,500

FIGURE 11
Well C2 Delta RPM Torsional Vibration
100%
90%
80%

D RPM

70%

Zone 2

Mov Avg DDDR 1
Mov Avg DDDR 2
Mov Avg DDDR 3

Run
3

Run 2

Run 1

60%
50%
40%
30%
20%
10%
0%
2,500

3,000

3,500

4,000

4,500

5,000

5,500

6,000

6,500
MD (ft)

7,000

7,500

8,000

8,500

9,000

FIGURE 12

MD (ft)

Depth versus Day Curves for Wells Analyzed

Well A
Well B1
Well B2
Well B3
Well B4

Time (days)

140 THE AMERICAN OIL & GAS REPORTER

9,500

10,000

10,500

the bits' degrees of lateral freedom, minimizing chordal drop and extending run
life.
However, the additional wall contact
while drilling the salt with the RNB stabilizer
increased torsional vibrations at the bit,
but not to a level that significantly damaged
the cutting structure or drill string. For this
application, we recommend running a nearbit stabilizer to increase bit durability when
transitioning from shale to dolomite, and
while drilling limestone.
Next, we correlated running larger
drill collars with an improved drilling
performance. The added mass per linear
foot increased the rotational kinetic energy
of the BHA. This added energy ensured
a more constant rotational velocity and
minimized stick slip.
Third, 5-inch HWDP should be used
only as a transition from the drill collars
to drill pipe. At 65 rpm, 5-inch HWDP
provides only 7 percent of the rotational
kinetic energy and 23 percent of the resistance to compressional bending of a
7-inch drill collar.
Four, we achieved the best performance
when the neutral point stayed within the
drill collars. Shifting the neutral point
into the more limber 5-inch HWDP initiated additional side forces and reactive
torque as it flexed into the borehole wall.
This significantly diminished weight transfer and rpm from surface to the bit, resulting in increased torsional vibrations
and poor drilling performance.
Finally, using driller's road maps improves the transfer of good operating
practices from one well to another, and
provides a starting point to optimize performance on a new well.
Furthermore, a number of countermeasures are being explored to manage
or reduce the root cause of the lateral
and torsional vibration leading to cutting-structure damage, a premature bit
trip, and a two-run interval:
* Drill bit design to address lateral
vibration;
* Drilling tools used to reduce lateral
and/or torsional vibration without increasing the risk in other areas of the
drilling operation; and
* A fully automated, wired drill pipe
project with real-time downhole weight
on bit, RPM, torque, and vibrations streamed
to surface from a tool within close proximity
to the bit (This would be the next significant
step change for the drilling process after
what was learned from the memory mode
data in this analysis).
r



American Oil and Gas Reporter - April 2015

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Contents
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American Oil and Gas Reporter - April 2015 - Cover2
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