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My FS2 DEE

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My FS2 DEE

  1. 1. 7in. Liner Cementation Job ANZ-7, Durga-2 Godwin Chidiebere Nwafor FS, WIT – PNI
  2. 2. SchlumbergerPrivate 2 Outline  Background  Design  Execution  Evaluation  Conclusion
  3. 3. SchlumbergerPrivate 3 Background Operator: SEEPCO Well: Anieze 7 Country: Nigeria Field: OML 143 Location: Durga – 2
  4. 4. SchlumbergerPrivate 4 General Overview Job Execution Job Evaluation Job Design
  5. 5. SchlumbergerPrivate 5 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
  6. 6. SchlumbergerPrivate 6 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
  7. 7. SchlumbergerPrivate 7 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.
  8. 8. SchlumbergerPrivate 8 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
  9. 9. SchlumbergerPrivate 9 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
  10. 10. SchlumbergerPrivate 10 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
  11. 11. SchlumbergerPrivate 11 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
  12. 12. SchlumbergerPrivate 12 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
  13. 13. SchlumbergerPrivate 13 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
  14. 14. SchlumbergerPrivate 14 Hazard Analysis and Risk Control (HARC)
  15. 15. SchlumbergerPrivate 15 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
  16. 16. SchlumbergerPrivate 16 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
  17. 17. SchlumbergerPrivate 17 Pre-Job Briefing Meeting
  18. 18. SchlumbergerPrivate 18 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.
  19. 19. SchlumbergerPrivate 19 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
  20. 20. SchlumbergerPrivate 20 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
  21. 21. SchlumbergerPrivate 21 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
  22. 22. SchlumbergerPrivate 22 Cementing Job Execution Report
  23. 23. SchlumbergerPrivate 23 Evaluation  Evaluation from the Client: Excellent Job Done by Schlumberger Cementing Crew at Durga-2 (Anieze-7)
  24. 24. SchlumbergerPrivate 24 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
  25. 25. SchlumbergerPrivate 25 Evaluation
  26. 26. SchlumbergerPrivate 26 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.
  27. 27. SchlumbergerPrivate 27 Thanks!!!

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