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Solutions for Reducing Torque, Drag, Casing Wearand More
Since 1989, the WWT International group of
companies has been providing services to
operators around the world - helping them overcome
many of the challenging conditions encountered during
drilling and completion operations, including torque,
drag, casing and riser wear, heat checking and drillpipe
buckling. The unique combination of our engineering
services, proven WWT Non-Rotating Protectors™
(NRPs) and long-standing experience enables us to
provide fully supported solutions that improve drilling
performance and completion efficiency by minimizing
energy loss caused by wellbore friction, thereby
optimizing energy delivery to the bit.
NRPS™
NRPS
NRPS
™
Applicable Conditions
WWT NRPs create a standoff, effectively isolating the drillstring while preventing damage to the critical contact areas of the casing.
WWT Non-Rotating Protectors (NRPs)
effectively prevent drillstring contact with
the wellbore and riser. You may benefit
from using WWT NRPs if you are faced with
one or more of the following challenges:
• Deep Directional Wells
• Extended-Reach Wells
• Horizontal Wells
• Unplanned Doglegs
• Deepwater Riser Operations
• Pad Drilling
• Deepwater Sub-Salt Wells
• Re-Entries and Sidetracks
• Shallow Kickoffs
• Production Riser Applications
• Slow, Difficult Drilling
• Deep, S-Shaped Wells
• Underpowered Top Drives
• Offset Well Heads
• Casing Patches
• Adverse Ocean Currents
Alloy Steel Bolts
Flutes Improve Flow
Upper Thrust Collar
Low-Friction Slider Pads
Low-Friction End Pads
Drillpipe
NRPS
NRPS™WWT NRPs create a standoff, effectively isolating the drillstring while
preventing damage to the critical contact areas of the casing.
Viability
In most cases, WWT Non-Rotating
Protectors will measurably improve your
operations. We take great care to ensure
that WWT NRPs will deliver maximum
results by offering a range of engineering
services, including:
• Well analysis to identify critical areas
of the wellbore where contact can hinder
performance and casing integrity
• Protector placement recommendations
to achieve the benefit level required for
each project
• Ongoing technical support (24/7),
both onsite and off, to ensure optimal
performance and client satisfaction.
Alloy Steel BoltsStandoff
Tool Joint
Casing
Lower Thrust Collar
Upper Thrust Collar
Protector Sleeve
Low-Friction End Pads
NRPS
Lateral Force:
Example of critical contact force areas in a well with deviation.
SS-5003/stand
SS-500 6/stand
DO NOT RUN PROTECTORS INTO OPEN HOLE
SS-5003/stand
SS-500 6/stand
SS-5000
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
15,000
0 1,000 2,000 3,000 4,000 5,000 6,000
CONTACT FORCE (lbf/31 ft.)
MEA
SURE
D DE
PTH
(ft.)
Zone
AZo
ne B
SS-5006/stand
SS-5003/stand
PROBLEM:Lateral force betweencasing and drillpipecan cause:• Casing wear• Riser wear• High torque• Excessive drag• Buckling• Tool joint heat checking• Drillpipe stress• Surface equipment stress
3,000 lbs.6,000 lbs.
Lateral Force:
3,000 lbs.
3,000 lbs.
3,000 to 6,000 lbs.Up to 3,000 lbs.0 lbs.
5” PremiumWWT Non-Rotating
Protectors
SOLUTION:
Start of Run End of Run
NRPS™
Before we begin any job, WWT International performs a comprehensive and
complimentary well analysis to recognize adverse wellbore conditions and
determine if WWT NRPs will be a viable solution. Client-provided information
and analysis results are maintained in a confidential manner. Our engineers
model the anticipated contact forces to make a placement recommendation
based on the areas of the wellbore where critical contact forces are shown
to exist and show predicted torque and drag with and without Protectors
for benefit comparison. Typically, our placement recommendation allows
the full objectives of our clients to be achieved by identifying and providing
protection for only the most problematic areas in the well. In addition to well
analyses, our engineering department can provide other analytical services,
including ECD, casing wear modeling, FEA, and drillpipe stress calculations.
Well Analysis - Placement Recommendation
Measureable BenefitsDepending on the application, and when used per our
recommendations, WWT Non-Rotating Protectors can
provide significant results. WWT NRPs are proven to:
• Prevent casing wear • Reduce torque and drag • Increase ROP • Minimize buckling• Extend drilling
operations in adverse ocean currents
• Reduce stick slip• Prevent riser and
production riser wear• Decrease vibration
• Preserve casing integrity for future sidetracks
• Minimize heat checking
• Increase weight to bit• Protect drillpipe• Reduce surface
equipment and drillstring stress and fatigue
Deviation,curvatureor dogleg
severity
CONTACTFORCE
CONTACTFORCE
CONTACTFORCE
STRINGWEIGHT
TENSIONIN PIPE
ß
ß
ß ß
ß
™
Proven Solution for Casing Wear
The results shown depict a study conducted comparing a 5-1/2” bare tool joint and a 5-1/2” WWT Super Slider Protector™ (SS) assembly rotating against 9-5/8” casing at 160 rpm for 2 hours with 1,000-lb. contact force in water-based drilling fluid.
The above graph represents the ditch magnet metal-collection weight over 27 12-hour intervals (13.5 days). After WWT Non-Rotating Protectors were installed, the amount of metal recovered was drastically reduced, eliminating the operator’s casing wear concerns.
ITEM BARE TOOL JOINT
WWT SUPER SLIDER™
Rotating FF 0.30 0.03
% Reduction 0% 90%
Casing Wear Depth 0.029 0.000
% Reduction 0% 100%
InstalledNRPs Metal Collection Weight Recorded at 12-Hour Intervals
Met
al W
eigh
t (gr
ams)
Collection Intervals (12 hours)
800
700
600
500
400
300
200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
NRPS
NRP-ProtectedTool Joint
UnprotectedTool Joint
NRPSWWT Non-Rotating Protectors
prevent casing wear by creating a
standoff between the tool joint and
the casing.The rotating tool joint can
severely wear the casing, resulting
in damage, expensive repairs, tie-
backs and downtime. Installing
a WWT Non-Rotating Protector
directly above the tool joint prevents
tool joint contact. Installing WWT
NRPs on each joint of pipe in the
high contact areas of the wellbore
provides optimal casing protection
for every hole section where
applied. If contact forces exceed
the side-load rating for an individual
assembly, another can be installed
to share the load, thereby allowing
any measure of contact force to be
accommodated. Placement flexibility,
along with no added connections,
keeps operations simple and safe. In
addition, there is no need to remove
and store WWT Protectors each
time you pull out of hole. Simply
manipulate the protected drillpipe to
maintain continued placement in the
critical zones of the well.
NRPSThe operator had drilled numerous wells using various mud additives, including beads and lubricants. When comparing this offset data with the use of WWT NRPs in a well in the same field with the same profile, the predicted torque using WWT NRPs showed improvement, whereas the actual torque reduction, which averaged 32%, was even more significant.
The operator was drilling a 4,800 m (15,700 ft.) S-shaped well and was concerned with torque as the trend showed that rig capabilities would be exceeded at TD. WWT NRPs were installed in the shallow, high contact areas of the well when they reached 4,269 m (14,006 ft.). As they drilled deeper and WWT NRPs moved into the high friction areas, the torque was reduced approximately 35%.
3,800
3,900
4,000
4,100
4,200
4,300
4,400
4,500
4,600
4,700
4,800
15,000 17,000 19,000 21,000 23,000 25,000 27,000 29,000
Torque 12-1/4” Section
Dept
h (m
)
16,000
15,000
14,000
17,000
18,000
19,000
20,000
21,000
22,000
23,000
24,000 0 5,000 10,000 15,000 20,000 25,000
Torque (ft.-lbs.)
Mea
sure
d De
pth
(ft.)
Torque While Drilllng 8-1/2” Section
Predicted Drilling Torque— No Protectors
Actual Drilling Torque— Protectors Installed
Average Torque Reduction: 32%
Drilling TorqueFrom Offset Wells
TorqueTrend:
No WWTProtectors,
0.24 0H,0.26 0H
WWT Protectors Installedat 4,269 m
1.8 million revs. on WWT Protectors at TD
NRPS™ Drillpipe rotation
Proven Solution for TorqueWWT Non-Rotating Protectors reduce rotational friction between the drillstring and the casing by creating a standoff between the two surfaces. The unique, patented inner sleeve geometry allows fluid to flow into the interior of the sleeve. Rotation of the drillpipe draws fluid across the sleeve flats, creating a fluid bearing
within the sleeve, reducing rotating friction by 50 to 90% even at low rpms and in almost any drilling or completion fluid. The result is that surface torque is significantly reduced allowing more torque to be distributed to the bit improving drilling performance and the rate of penetration (ROP).
Mud from the annulus flows into the fluid channelson the inside of the sleeve. This fluid is drawn between the rotating drillpipe and the stationary sleeve.
The fluid forced betweenthe rotating pipe and the sleeve
creates a “fluid cushion” between the two elements, dramatically reducing friction.
Mud flow in annulus
NRPS™Proven Solution for Drag
Sliding friction (drag) was recorded as the amount of hook load an operator experienced when coming out of the well from 23,000 ft. Installed WWT Super Slider Protectors (SS) were pulled back up through the contact forces in the build section and the overall sliding friction factor dropped to 0.14. When the WWT Protectors were in the vertical section where contact forces were not present, the overall sliding friction factor rose to 0.18. The effective sliding friction factor reduction was 0.04 (22%).
16,500
17,500
18,500
19,500
20,000
21,000
22,000
23,000
250 300 350 400 450
Friction Factor = 0.10
Friction Factor = 0.20MEA
SURE
D DE
PTH
(ft.)
HOOK LOAD (K lbs.)
WWT Super Sliders out of the hole
WWT Super Sliders
coming outof hole
Overall FFrising
to 0.18
WWT Super Sliders rising to position
Overall FFdroppingto 0.14
Sliding frictionincreases again
as WWT Protectors come out of
the well.
Sliding frictiondrops as WWT
Protectors comeinto build section.
NRPSWWT Super Slider Protectors™ (Model SS and Model
SS3) feature low-friction sleeves to reduce sliding friction
between the drillstring and the casing. The sleeve slides
easily along the casing while the drillpipe rotates in its ID,
isolated from contact with casing. As a result, slack-off
weight is increased and pick-up weight is decreased at
the surface.
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 110000 12000 13000 14000 15000 16000 17000
600
500
400
300
200
100
0
MEASURED DEPTH
HOOK
LOAD
(lbs
)
The operator had trouble running an 11-3/4” liner due to limited hook load, which caused lock-up. WWT Protectors were installed on the 6-5/8” drillpipe mid-joint to reduce sliding friction and buckling. The operator successfully ran an 11-3/4” liner and an 11-3/4”expandable liner to TD without problems.
250 300 350 400 450
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000
MEASURED DEPTH (ft.)
600
500
400
300
200
100
0
HOOK
LOA
D (lb
s.)
Hook Load, Current Well withWWT Non-Rotating Protectors
11-3/4” Liner Run to14,000 ft. No Problems.
Hook Load, Current Well withWWT Non-Rotating Protectors
11-3/4” Expandable LinerRun to 15,600 ft.
No Problems.
Hook Load Previous Well W/OWWT Non-Rotating Protectors
11-3/4” Liner Run,Lock-up at 15,300 ft.
Hook load 11-3/4” Liner Run (Previous Well)Hook load 11-3/4” Liner Run (Current Well)Hook load 11-3/4” Expandable Liner Run (Current Well)
Reduced Column Length
WWT Protectors can be used to increase buckling thresholds by 50-100%
NRPS™
WWT Non-Rotating Protectors are proven to reduce drillstring buckling
by reducing the effective column length of the drillpipe while at the same
time reducing sliding friction. Finite element analysis and field experience
have shown that reducing the unsupported length by placing a WWT
Protector in the middle of the drillpipe can reduce or prevent buckling
effects such as increased torque, drag, vibration and drillstring lockup,
resulting in better weight transfer and improved drilling performance.
Proven Solution for Buckling
Effective Column Length
➤
➤ Standoff between ball jointand drillpipe tool joint
Ball Joint Angle
➛
➛
➤ ➤
➤ ➤
➤ ➤
➤ ➤
➤
➤
Ocean
Current
R I S
E R
D E
F L E C
T I O N
Flex Joint Angle
➤
Maximum riser flex joint angle
NRPS
Proven Solution for Riser and LMRP Wear
Drilling operations were shut down to prevent wear to the LMRP components when the riser deflection angle exceeded 0.5 degrees. WWT NRPs were installed to protect the lower section of the riser and LMRP, which increased the safe operating angle to 2.5 degrees, extending operations by 15 days.
WWT Non-Rotating Protectors are
ideal for riser and BOP/wellhead
protection in deepwater operations.
WWT Protectors are proven to
extend the operating window in
adverse ocean currents. Operators
have been able to continue drilling
operations when they would have
been otherwise shut down waiting
for currents to subside. The WWT
Protector provides adequate standoff
between the drillstring and the riser,
flex joint, wellhead and blowout
preventer, thereby preventing
wear and damage. WWT NRPs are
also an effective defense against
production riser wear, allowing
protected operations through single
barrier risers. WWT SC (Strippable)
assemblies provide additional
holding power and have successfully
stripped through a typical subsea
annular BOP configuration during
testing.Previous limit at 0.5˚
Current limit at 2.5˚+
Max
imum
flex
join
t ang
le, d
egre
es
5/AUG 12/AUG 19/AUG 26/AUG 2/SEP 9/SEP
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
WWT NRPsSaved
Operator15
Days
HurricaneEvacuation
Innovative Products for Drilling, Completion and Intervention Profitability
WWT International ™
We have a solution that will work for you.
Call us today for a free well analysis
or visit our web site for more
information.
www.wwtinternational.com
© 2015 WWT North America Holdings, Inc. All rights reserved.™ is a trademark of WWT North America Holdings, Inc. ™ WWT Non-Rotating Protectors (NRPs) and WWT Super Slider (SS3) Non-Rotating Protector are trademarks of WWT North America Inc. Produced in the U.S.A. 2/2015
™
Houston, Texas, USA
Al-Khobar, Saudi Arabia
Dubai, UAE
Rio De Janeiro, Brasil
Quito, Ecuador
Aberdeen, Scotland
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