This document summarizes a 7-inch liner cementation job. It provides background on the operator, well, and location. The design called for cementing from 2618m MD to 100m above the liner hanger at 1883m. Slurry designs and additive calculations are shown to achieve zonal isolation. Execution procedures were outlined, including pre-job meetings and contingencies. Pressure monitoring during pumping showed the job proceeded as planned with no issues. The conclusions were that centralizers, conditioning the well, and using a Schlumberger pump unit helped achieve good results.

1. 7in. Liner Cementation Job
ANZ-7, Durga-2
Godwin Chidiebere Nwafor
FS, WIT – PNI

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Outline
 Background
 Design
 Execution
 Evaluation
 Conclusion

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Background
Operator: SEEPCO
Well: Anieze 7
Country: Nigeria
Field: OML 143
Location: Durga – 2

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General Overview
Job Execution
Job Evaluation
Job Design

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Design Overview
Previous Casing- MD: 1982m, OD: 9 5/8in, Weight: 47lb/ft
Casing/Liner- MD: 2618m, OD: 7in, Weight: 29lb/ft
Total MD- 2620m
Hole Size- 8.805in
Landing Collar- 2584m
Annular Excess- 20%
Liner Hanger-1883m
Top of liner planned 99m above previous casing shoe.Top of liner planned 99m above previous casing shoe.
100m of cement is planned above Liner Hanger100m of cement is planned above Liner Hanger

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Design Objectives
 Have good cement across liner lap and at Shoe.
 Achieve zonal isolation of the reservoirs
 Perform job with no downtime, spillage or incident

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Slurry Design
 The slurry design will make use of D600G (GasblockTM
), this
additive permit a very good bonding between casing and
cement and cement and formation.
 The slurry will cover several permeable zones, therefore
Fluid Loss additives (D168) will be used.
 The slurry is to be mixed at 15.8 ppg, which will cover the
whole length of liner up to 100 ft above the liner hanger.

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Slurry Design
Code Concentration Component
G Cement
Fresh Water 3.462 gal/sk Base Fluid
D153 0.300% BWOC Antisettling
D206 0.100 gal/sk Antifoam
D600G 1.200 gal/sk GASBLOK
D168 0.300 gal/sk Fluid Loss
D145A 0.130 gal/sk Dispersant
D081 0.006 gal/sk Retarder
Slurry Density 15.80 Ib/gal
Yield 1.17 ft
3
/sk
Mix Fluid 5.211 gal/sk
BHST 208 degF
BHCT 171 degF
ISOBLOK Tail Slurry; Volume = 97.6 bbl

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Slurry Design
Laminar Spacer (MUDPUSH II); Volume = 50 bbl
Code Concentration Component
Fresh Water 0.742 bbl/bbl of spacer Base Fluid
D020 1.500 bbl/bbl of spacer Extender
D182 4.000 bbl/bbl of spacer Turbulent Spacer
D047 0.100 bbl/bbl of spacer Antifoam
D031 228.37 bbl/bbl of spacer Weighting Agent
F105 2.000 gal/bbl of spacer Multifunction solvent
U066 2.000 gal/bbl of spacer Mutual Solvent
Density 12.50 Ib/gal
Type MUDPUSH II

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Key Service Quality Requirements (KSQR)
Key Service Quality Requirements
• Schlumberger and Client approved job program, which
includes:
(i) Job Design and Procedure
(ii) a CemCADE Program
• Perform thickening time and rheology tests, free fluid and
fluid loss tests
• Two independent persons to verify volumes and additives
calculations

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Quality, Health, Safety & Environment
Quality, Health, Safety & Environment
• Crew is current on relevant QHSE standards as per SLB
QHSE S005
• Equipment is prepared & current on STEM as per WS QHSE
Std 3.
• Necessary equipment is available to perform the job as
designed and comply with relevant SLB QHSE and WS
QHSE standards, including WS QHSE Std 23.
• All other standards relating to the type of job to be performed

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Job Execution
Slurry Volumes:
Vol 1 (100m above Liner Hanger) = 16.04 bbl
Vol 2 (TOL – Previous Casing) = 8.32 bbl
Vol 3 (OH + Excess) = 69.4 bbl
Vol 4 (Shoe Track) = 4.14 bbl
Total Slurry Volume = 97.90 bbl
Displacement: Maximum Over-displacement:
Vol 1 (Liner) = 85.3 bbl = ½ x 4.14 = 2.07 bbl= ½ x 4.14 = 2.07 bbl
Vol 2 (DP) = 98.36 bbl
Vol 3 (HWDP) = 5.68 bbl
Total Displacement = 189.34 bbl

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Additive Calculations
MUDPUSH Additives
Code Concentration Volume
Fresh
Water
0.742 bbl/bbl of spacer 66.78 bbl
D020 1.500 Ib/bbl of spacer 135 Ib
D182 4.000 Ib/bbl of spacer 360 Ib
D047 0.100 gal/bbl of spacer 9 gal
D031 228.37 Ib/bbl of spacer 9.32Mton
F105 2.000 gal/bbl of spacer 180 gal
U066 2.000 gal/bbl of spacer 180 gal
Slurry Additives
Code Concentration Volume
Fresh
Water
3.462 gal/sk 39.57 bbl
D153 0.3000% BWOC 135.36 Ib
D206 0.100 gal/sk 48 gal
D600G 1.200 gal/sk 576 gal
D168 0.300 gal/sk 144 gal
D145A 0.130 gal/sk 62.4 gal
D081 0.006 gal/sk 2.88 gal
Based on 100 bbl of Slurry Based on 90 bbl of MUDPUSH II
Dead Volume = 40 bbl

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Hazard Analysis and Risk Control (HARC)

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Thickening Time
Flush Line: 5bbl/5bpm = 1min
Test Line @ 2500psi 5min
Pump MUDPUSH II: 40bbl/6bpm = 6.7 min
Pump ISOBLOK Slurry: 98bbl/6bpm = 16.3 min
Drop Wiper Dart: 10 min
Displacement (SOBM) 85bbl/6bpm = 14.2 min
Displacement (MUDPUSH II) 10bbl/6bpm = 1.7 min
Displacement (SOBM) 7.7bbl/2bpm = 3.85 min
Displacement (SOBM) 77.2bbl/6bpm = 12.9 min
Displacement (SOBM) 10 bbl/2bpm = 5 min
Total Time = 76.7 min

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Thickening Time
Total Time = 76.7 min
Thickening Time (TT) = 76.7 + 120 = 196.7 min
= 76.7 x 1.5 = 115.05 min
Hence, TT = 196.7 min = 3 hr 17 mins3 hr 17 mins

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Pre-Job Briefing Meeting

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Contingency Plans
 Bumping of the top dart is not observed
Check displacement tank. If it corresponds to the theoretical
volume, a maximum of 50% of the shoe track volume may be
pumped again.
 Failure in the Float Equipment (Collar, Shoe or both of
them)
Pump again the backflow. Wait for few minutes. Check for
backflow. If it continues, the returned fluid must be pumped
again. Later on, proceed to POOH with the Drill Pipe
immediately at controlled speed.

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Cementing Job Execution Procedure
1. Once casing is on bottom, circulate a minimum of one hole
volume to condition mud.
2. Stop circulation and set Liner Hanger
3. Re-establish circulation, staging up, and circulate unitl ready
to start the cement job
4. Hold Pre-Job Safety Meeting
5. Stop circulation
6. Pressure Test lines to 250 / 5500 psi with cement unit
7. Bleed-off pressure and line up valves to pump down hole
8. Break circulation with rig pump
9. Schlumberger to Pump 40 bbl MUDPUSH II Spacer @ 6bpm

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Cementing Job Execution Procedure
10. Shut down and line up cement unit
11. Schlumberger to pump 98 bbl 15.8ppg Liner Slurry at 6 bpm
12. Drop Drillpipe Wiper Dart
13. Displace as follows:
a. Schlumberger to pump 85.0 bbl Mud at 6.0 bpm
b. Schlumberger to pump 10.0 bbl MUDPUSH II at 6.0 bpm
c. Schlumberger to pump 7.7 bbl Mud at 2.0bpm (note pressure
increase when liner wiper plug is released)
d. Schlumberger to pump 77.2bbl Mud @ 6bpm
e. Schlumberger to pump 10.0bbl Mud @ 2bpm to bump plug

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Cementing Job Execution Procedure
 If liner wiper plug release is noted by a pressure increase,
zero the volume counter and displace the Liner volume.
 If the plug does not bump after pumping the calculated
displacement volume, do not over-displace more than 50%
of shoe track volume to avoid getting a wet shoe. Stop
pumping, bleed off the drill pipe pressure and confirm floats
are holding and WOC.
Co-Man: Ketah Shah/RajuCo-Man: Ketah Shah/Raju
Date: 25Date: 25thth
June 2012June 2012

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Cementing Job Execution Report

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Evaluation
 Evaluation from the Client: Excellent Job Done by
Schlumberger Cementing Crew at Durga-2 (Anieze-7)

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Evaluation
06/28/2012 14:04:30
Cementing Job Report
Well A N IE ZE 7
Field O M L 1 43
Engineer Godwin N wafor
Country N I GE RI A
Client SE EP C O
SIR No.
Job Type P res s ure after 7 in L iner Job
Job Date 2 8 - June- 2 0 12
Time
06/ 28/ 20 12 12 :3 6:0 1
06/ 28/ 20 12 13 :3 8:2 9
hh:mm:ss
12:36:01
12:41:00
12:46:00
12:51:00
12:56:00
13:01:00
13:06:00
13:11:00
13:16:00
13:21:00
13:26:00
13:31:00
13:38:2913:38:29
Pressure
PSI
0.00 1000 2000 3000 4000 5000
Rate
B/M
0.00 2.0 4.0 6.0 8.0 10.0
Density
LB/G
5.0 10.0 15.0 20.0 25.0
Messages
Flushing of line (Vol = 3.3bbl)
Started Pressure Testing
Bleed-off; Return = 6.5bbl
Stopped Acquisition

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Evaluation

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Conclusions & Recommendations
 There were no operational problems with the cement job.
 In jobs like this, a liner, it is important to have a good control
with pumping pressures and displacement volumes, for this
reason is advisable to use a Schlumberger Pump Unit when
is possible.
 Always, the centralizers helps to achieve a good Stand Off,
this implicate to have a good mud removal, hence it is
strongly recommendable to follow the centralization program.
 It is very important to conditioning the well before the
cementing job. This procedure includes to circulate the well
at least one hole volume at high rates, this is more than 6
BPM.

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Thanks!!!