My FS2 DEE
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Transcript of My FS2 DEE
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7in. Liner Cementation JobANZ-7, Durga-2
Godwin Chidiebere NwaforFS, 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 OverviewPrevious Casing- MD: 1982m, OD: 9 5/8in, Weight: 47lb/ftCasing/Liner- MD: 2618m, OD: 7in, Weight: 29lb/ftTotal MD- 2620mHole Size- 8.805inLanding Collar- 2584mAnnular 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 ComponentG 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/galYield 1.17 ft3/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 DesignLaminar 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 & EnvironmentQuality, 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 ExecutionSlurry Volumes:Vol 1 (100m above Liner Hanger) = 16.04 bblVol 2 (TOL – Previous Casing) = 8.32 bblVol 3 (OH + Excess) = 69.4 bblVol 4 (Shoe Track) = 4.14 bblTotal Slurry Volume = 97.90 bblDisplacement: 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 bblVol 3 (HWDP) = 5.68 bblTotal Displacement = 189.34 bbl
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Additive Calculations
MUDPUSH AdditivesCode Concentration VolumeFresh 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 AdditivesCode Concentration VolumeFresh 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 IIDead Volume = 40 bbl
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Hazard Analysis and Risk Control (HARC)
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Thickening TimeFlush Line: 5bbl/5bpm = 1minTest Line @ 2500psi 5minPump MUDPUSH II: 40bbl/6bpm = 6.7 minPump ISOBLOK Slurry: 98bbl/6bpm = 16.3 minDrop Wiper Dart: 10 minDisplacement (SOBM) 85bbl/6bpm = 14.2 minDisplacement (MUDPUSH II) 10bbl/6bpm = 1.7 minDisplacement (SOBM) 7.7bbl/2bpm = 3.85 minDisplacement (SOBM) 77.2bbl/6bpm = 12.9 minDisplacement (SOBM) 10 bbl/2bpm = 5 minTotal Time = 76.7 min
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Thickening TimeTotal 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 Procedure1. Once casing is on bottom, circulate a minimum of one hole
volume to condition mud.2. Stop circulation and set Liner Hanger3. Re-establish circulation, staging up, and circulate unitl ready to
start the cement job4. Hold Pre-Job Safety Meeting5. Stop circulation6. Pressure Test lines to 250 / 5500 psi with cement unit7. Bleed-off pressure and line up valves to pump down hole8. Break circulation with rig pump9. Schlumberger to Pump 40 bbl MUDPUSH II Spacer @ 6bpm
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Cementing Job Execution Procedure10. Shut down and line up cement unit11. Schlumberger to pump 98 bbl 15.8ppg Liner Slurry at 6 bpm12. Drop Drillpipe Wiper Dart13. Displace as follows:a. Schlumberger to pump 85.0 bbl Mud at 6.0 bpmb. Schlumberger to pump 10.0 bbl MUDPUSH II at 6.0 bpmc. 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 @ 6bpme. 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 floatsare holding and WOC.
Co-Man: Ketah Shah/RajuCo-Man: Ketah Shah/RajuDate: 25Date: 25thth June 2012 June 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 J ob Report
Well A NI E ZE 7
Field O ML 143
Engineer Godwin Nwafor
Country NI GE RI A
Client SEEP CO
SI R No.
J ob Type P res sure after 7 in Liner J ob
J ob Date 28- J une- 2 012
Time06 / 28 / 20 1 2 12 : 3 6 :0 1
06 / 28 / 20 1 2 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
Started Acquisition
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!!!