Case Study – Foothills Region, Canada
2008 CASING DRILLINGTM Plastering Success
• 9-5/8” casing x 12-1/4” EZCase drilled from 850 M to 1,250 M
• CD effectively reduced lost circulation while drilling
• NPT reduction > 50%
Measured depth, meters
860
960
1060
1160
1260
0
2
4
6
8
10
Days from Drill-out of Previous Casing
12
2008 Results from Canadian Foothills:
Circulation Improved while Drilling Ahead
Measured depth, meters
100%
Partial Loss
Stop drilling
Drilling
50%
0%
Artic Permafrost Application
Mackenzie Delta –Canada
Conventional Drilling Issues
• Keeping Permafrost frozen is critical to
wellbore stability.
• Hydrates and borehole erosion.
• Mud cooling is required.
• Conventional drilling requires high flow
rates for hole cleaning.
• Lots of problems with high flow rate
coolers.
• Difficult to keep hole stabile while tripping
to run casing.
• Small pumps dictated by ice road limits.
SPE paper 111806
Artic Permafrost Application
Mackenzie Delta –Canada
Casing Drilling Solution
• Drilling with casing:
• eliminated need to trip.
• allowed good cleaning at low flow rates.
• minimized pressure losses (heating).
• implemented with small pumps
• BHA: 17-1/2 EZCase bit, stab, float collar, joint of
casing, float collar, stab, 4 jts casing, stab, csg
• Mud cooling.
• KCl polymer mud (8-10% KCl depresses
freezing)
• Spiral heat exchanger, ammonia
refrigerant, glycol heat exchanger fluid
• Spiral exchanger minimized plugging
but gave adequate contact surface and
time.
Conclusions/Observations
• Minimized flat time.
• No borehole stability issues.
• Cooling system & CD prevented
permafrost from degrading.
• Extended casing setting depth
well below base of permafrost.
•Kept ROP below 15m/hr to
minimize need to stop drilling
and circulate for hydraulic lift.
• Walnut hull sweeps used to
control balling.
• EZCase drilled out with TCI bit.
CASING DRILLING® Project Summary
Pan American ENERGY, Argentina
 PAE received approval from government to extend
its Cerro Dragon concession (4000 Km2) to 2017.
They will drill approximately 300 wells /year.
 At least 10% of these well will benefit from CwD,
due to problems associated to Water Injection/
depletion problems (High Losses).
 CwD project initiated as Enhanced Productivity
Project (rather than Drilling)
 A typical well is cased with 9 5/8” @ 300m & 5 ½” @ 2,400m.
 Tesco® Project: Evaluate a 5 well Project with 5½” BRT®
OBJECTIVE: To be able to drill the production hole with minimum NPT
associated to losses, trips, allowing a positive impact on the productivity
of the well
Pan American ENERGY Project Summary
Hrs/100 Mts
20
18
15
C Dragon
12
# Hrs /100 Mts
13
11.3
C Grande
15
15
CD well # 4
CD well # 5
10
5
0
Conv WellC.Dragon
CD well # 1
CD well #2
CD well # 3
Conv. CD1 CD2 CD3






19
Conv WellC.Grande
Conv. CD4 CD5
Successfully drilled both areas: Averaged 14 days/well.
Reduce NPT related to loss circulation and highly damaged reservoirs.
Reduced production hole from 13 to 11 days.
Good quality wells: Better CBL’s and one well did not require fracturing.
C Grande previously considered not accessible.
Value: Less Completion Costs & possibly better productivity .
CURRENT CUSTOMER STATUS: PAE Evaluating production results. PAE requesting
fiscal leverage from government related to technology deployment, in order to start
back in Jan 09
SUCCESS IN THE ARABIAN GULF
What:
Where:
2nd OFFSHORE DIRECTIONAL CASING DRILLING™ from a
SIDETRACK
QATAR – MIDDLE EAST
Challenge:
• Lost 2 BHA’s drilling conventionally
thru the unstable shale formation.
Objective:
• Drill a directional section through unstable
shale formation with 9 5/8” casing.
Results:
• Used CDS™ to make up and run 9 5/8”
casing, then drilled with the casing
• CASING DRILLING™ successfully drilled the
12 ¼” hole section into the reservoir
Job Details:
• Casing Size: 9-5/8 - 47Lbs/ft, L80, BTC c/w
MLT™ Rings
• CASING DRILLING™ footage drilled 1,416 ft
• Job Date: September, 2008
SUCCESS IN THE ARABIAN GULF
RSS CD-BHA
Operations:
• BHA: PDC Bit/Rotary Steerable/MWD/RR/UR/Motor/DLA
• No issues tripping / drilling casing thru openhole sidetrack
10' Pick-Up Joint
• Used 1 BHA to drill the entire hole section at 38 ft/hr
9 5/8" DLA - 3
550 #
9 5/8" Profile Nipple
(CPN)
• Successfully set / retrieved BHA using drill pipe (Level 3)
2.72 '
4 1/2 XH Pin Down
4 1/2 XH Box Up
• Built from 65° to 86.4°, turning the azimuth from 272° to a 292°
40.17 '
Internal Tandem
Stabilizer
9 5/8" Shoe Joint
900 #
4 1/2 XH Pin Down
• Unstable shale, pack-off csg near TD in the top of the reservoir
4 1/2 XH Box up
Crossover
TESCO
4 1/2 IF Pin Down
CRIMP ON
4 1/2 IF Box up
300 #
STABILISER
• BHA, tripped thru casing to surface, leaving shale behind casing
Mud Motor
3000 #
Directional
Reaming
Shoe
5 1/2" FH Box Down
4 1/2 REG Pin Up
Crossover
5.92 '
300 #
4 1/2 REG Box Down
4 1/2 REG Pin Up
Highlights:
Underreamer
860 #
4 1/2 REG Box Down
4 1/2 REG Pin Up
• No QHSE incident occurred during the Job
• No rig modifications were required
Crossover
325 #
4 1/2 IF Pin Down
4 1/2 IF Box Up
Redback Roller
Reamer
700 #
4 1/2 IF Pin Down
4 1/2 IF Box Up
Stickout
80.70 '
Crossover
325 #
5 1/2" FH Pin Down
5 1/2" FH Box Up
• Tesco’s CDE™ torque modeling proved reliable
Filter Sub
400 #
4 1/2 IF Pin Down
4 1/2 IF Box Up
Slimpulse MWD
• No loss circulation, Torque and Drag trended well
3100 #
4 1/2 IF Pin Down
4 1/2 IF Box Up
• Achieved desired directional trajectory
Xceed675 RSS
3000 #
• Provided cased wellbore into reservoir.
74.78 '
4 1/2 Reg Box Down
4 1/2 Reg Pin Up
8 1/2" PDC Bit
100 #