Mark Dykstra - Stick Slip Presentation
Mark Dykstra - Stick Slip Presentation
Mark Dykstra - Stick Slip Presentation
Mark Dykstra
Rob Grauwmans
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 1
Overview
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 2
Recap: The Science of Stick-Slip Conclusions
RPM
600
Torsional drillstring behavior includes 400
200
torsional oscillations and stick-slip Very High
0 Bit RPM
(periodic bit stalls)
Stick-slip is detrimental to drill bits kN.m
30
and can be damaging to MWD tools Severe
20 Torque
Cycles
Stick-slip is relatively well understood, 10
0
can be modeled, and can be recognized
Reverse
downhole and on surface kN Rotation
150
Stick-slip can be mitigated manually,
100
automatically, and via downhole subs
50 Low
Removing torsional oscillations WOB
200 250
increases the likelihood of MWD failure
due to lateral vibrations Stick-slip Stick-slip
present NOT present
July 2010 3
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop
Economic Implications
Fewer bit runs Lower spread rate Faster bit runs Fewer trips
Abrasive Wear
High RPM accelerates wear
f v, F , Twf
dH c
dt
Wear rate RPM WOB Temperature Impact Damage
Glowka, D.: “Implications of Thermal Wear Phenomena for PDC Bit Design and Operation,” SPE 14222
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 4
Drilling Efficiency: New Versus Dull
Carthage Marble
New T1 Dull
A
com dde
an p d
l
d d an i
am ce
M Electric Motor pin
Drive Inertia g
Achieved by changing
Pipe Stiffness
the drive controls
Could be software or
electronics
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 6
STRS Response
Initial Success M
Magnitude [rpm/Nm]
1
MEASURED
0.8
No existing installations 0.6
MODEL
0.4
met acceptance criteria 0.2
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Recent Success
-100 MEASURED
Phase [deg]
MODEL
Fit for Purpose Solutions (10 -120
-140
rigs) -160
-180
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Frequency [Hz]
Clear commissioning protocols
RTOC monitoring
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 8
Rejuvenation Since 2009
Pinedale
Hans Deul
Roger Lewis
Changbei Rigs 1 & 2
Libya T202
GSF Monarch
SEDCO 711
Magnolia F34, F06
Libya EDC 56
SDA: SONGA VENUS
GABON RIG 59
BRAZIL STENA
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 9
Results: Noble Hans Deul
STRS turned on
NAM
Jackup, North Sea
Electroproject STRS
12 ¼” section
2450–5550 m
60º inclination
PDC bit
5 ½” DP
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 10
Hans Deul …
Downhole stick-slip measurement: Detailed time zoom:
STRS ON STRS OFF
Step change in
stick-slip severity
Eliminated stick-slip
Improved steerable system
performance
Increased ROP by 10%
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 11
Hans Deul Record Run
12.5
42% ROP improvement since
STRS
MD [1000 * ft]
13.5
14
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 14
Summary
Stick-Slip is Expensive
Increased bit cost due to number of runs, repair/replacement charges
Increased hourly cost due to motor usage
Increased drilling time due to accelerated dulling (low ROP)
Increased trip time due to number of runs
Increased costs associated with downhole tool damage (MWD, LWD)
Mitigation of Stick-Slip using STRS Saves Money
STRS effective when properly implemented and commissioned
Proven ROP increases from 10-70%
Improved steerable system performance (reduced failures)
Reduced bit damage, longer bit runs
Savings from thousands to millions
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 15
Questions?
Copyright of Shell Exploration & Production IADC Stick-Slip Mitigation Workshop July 2010 16