This document provides a design proposal for cementing operations on the VINITA 1B - 23 well. It includes designs for cementing the 10 3/4" surface casing at 4,950 feet and the 7" production liner at 9,214 feet. For each operation, it outlines job objectives, well data, risk analysis, recommended procedures, pumping schedules, and simulation results from cementing software. The simulations model fluid properties, pressure profiles, temperature effects, centralizer placement, cement coverage, and pumping requirements. The goal is to achieve zonal isolation and provide competent barriers for further well construction.

1. VINITA 1B – 23 WELL
SURFACE CASING & LINER CEMENTING
DESIGN PROPOSAL
Christopher Phillips, Godwin Nwafor, Adam Vondal, Bilal
Khelfaoui

2. SchlumbergerPrivate
2
GENERAL OVERVIEW
2. Job Execution
3. Job Evaluation
1 Job Design

3. SchlumbergerPrivate
3
OUTLINE
I. 10 ¾‘” SURFACE CASING DESIGN:
 Job objectives
 Well / Job Data
 Risk analysis
 Job procedure
 CemCADE* & WELLCLEAN II simulations
 General recommendations
II. 7” LINER DESIGN:
 Job objectives
 Well / Job Data
 Risk analysis
 Job procedure
 CemCADE* & WELLCLEAN II simulations
 Logistics

4. SchlumbergerPrivate
4
10 ¾‘” SURFACE CASING DESIGN
Job Objectives
To bring top of cement up to surface
To provide a competent shoe-track to be able drilling the next section
Wait until surface samples harden to resume drilling

5. SchlumbergerPrivate
5
Well Data & Schematics
20.000 in Csg
106.50 lbm/ft
42 ft
Top of Tail
4450 ft
10.750 in Csg
45.50 lbm/ft
4950 ft
Float Collar
4870 ft
Tail
62.18 bbl
Lead
490.43 bbl
Disp. Fluid1
468.34 bbl
i- Handbook* - *a mark of Schlumberger
Created on 9/2/2013 10:23:49 PM

6. SchlumbergerPrivate
6
RISK ANALYSIS
Key risks Contingencies
- Cement setting inside the casing due to
poor slurry design and/or testing.
- Correct selection of temperature is critical. Computer temperature
simulations must be run to assess the temperatures during
placement and while the cement develops compressive strength.
- Incorrect displacement volume, resulting
in un-desired cement left in pipe.
- Accurate displacement volumes are critical; cement pumps are
preferred, however, accuracy can be achieved using rig pumps with
known efficiencies.
- Cement does not achieve sufficient
strength at the shoe-track
- Allow a sufficient WOC, tagging the TOC prior final C.S. is achieved
is not recommended.
- Losses prior to the cementing job during
mud circulation
- CemNET* is recommended at concentration of 2 lb/bbl in order to
minimize losses while cementing.
- Severely washed out holes compromise
mud removal and therefore cement-to-
formation bonding / channeling
- The low annular velocities occurred in such cases will impact
drastically the isolation results and logging evaluation, viscous gelled
mud’s can cause substantial channeling; pipe rotation and effective
mud circulation prior to pumping cement will help to mobilize mud.
- Gas presence while drilling
- In the event of gas-cut, it is strongly advised to remove completely
any gas presence in the well prior to the cementing job; not doing
this will allow gas to percolate through the slurry up to surface (gas-
leak).
- It is strongly advised to use gas control additives in the slurry design
in order to avoid gas channeling; not doing this will compromise
isolation results.

7. SchlumbergerPrivate
7
JOB PROCEDURE/RECOMMENDATIONS: (KSQR)
After finishing RIH casing, start mud circulation to cool the temperature down to the
BHCT. Check mud returns, abnormal circulating pressure, losses, etc.
- At the same time prepare spacer:
46 bbls of spacer @ 10.80 ppg
 Prepare the Mix fluid for the slurry
 Stop mud circulation
Pumping sequence:
 Pumping time 03:01 hr:min
 If plug doesn’t bump,
pump ½ volume of the shoe-track
 Bleed off pressure, check returns
 End of job
Pumping Schedule
Name Flow Rate
(bpm)
Volume (bbl) Stage Time (Min)
Spacer 6.0 40.0 6.7
Drop Bottom Plug 0.0 0.0 10.0
LiteCRETE Slurry 6.0 490.5 81.7
UniFLAC Slurry 6.0 62.2 10.4
Drop Top Plug 0.0 10 10.0
Spacer 6.0 6.0 1.0
WBM 8.0 442.2 55.3
WBM 2.0 20 6.7

8. SchlumbergerPrivate
8
JOB PROCEDURE/RECOMMENDATIONS: (KSQR)
Time Check
Fluids placement time
(hr:min)
KSQR policy
(min)
Minimum T.T.
Hr:Min
LiteCRETE UniFLAC
03:01 120 05:01 03:25
SQ contingency measures (KSQR 1.2):
When mixing any slurry every effort should be made to mix 80%
to 95% of the total slurry volume between the density fraction
tolerances (+/- 0.15 ppg):
Maximum shutdown time: 20 min
Lead (ppg) Tail (ppg)
Lower Limit 11.53 15.71
Upper Limit 11.83 16.01

9. SchlumbergerPrivate
9
CemCADE & WELLCLEAN II Simulations
Fluid Sequence
LiteCRETE
Additives
Concenetration
Class G
Cement
31.7% BVOB
D124 58.3% BVOB
D178 10% BVOB
D206 0.024 gal/sk
D168 0.3 gal/sk
D080A 0.14 gal/sk
UNIFLAC Concentration
D206 0.023gal/sk
D153 0.1% BWOC
D168 0.338 gal/sk
D080A 0.056 gal/sk
D081 0.011 gal/sk
Fluid Sequence
Name
Volume
(bbl)
Ann.
Len
(ft)
Top
(ft)
Density
(lb/gal)
MUDPUSH II 40 10.80
LiteCRETE
Lead Slurry
490.50 4450 0.0 11.68
UNIFLAC Slurry 62.2 500 4450 15.86
MUDPUSH II 6.0 4807.6 10.80
Mud 462.4.0 0.0 9.80

10. SchlumbergerPrivate
10
CemCADE & WELLCLEAN II Simulations
1. Fluid Sequence & Static Well Security0200040006000
ft
Well
8 10 12 14
lb/gal
Static Well Security
Hydrostatic
Frac
Pore

11. SchlumbergerPrivate
11
Pumping Schedule
Name
Flow Rate
(bbl/min)
Volume
(bbl)
Stage Time
(min)
Cum.Vol
(bbl).
Inj.
Temp.
(degF)
Comments
Spacer 6.0 40.0 6.7 40.0 80
Pause 0.0 0.0 10.0 0.0 80 Drop Bottom
LiteCRETE 6.0 490.5 81.7 490.5 80
UniFLAC Slurry 6.0 62.2 10.4 62.2 80
Pause 0.0 0.0 10.0 0.0 80 Drop Top Plug
Spacer 6.0 6.0 1.0 6.0 80
WBM 8.0 442.4 55.3 442.4 80
WBM 3.0 20.0 6.7 462.4 80
Total 03:01 hr:mn 1061.0 bbl
CemCADE & WELLCLEAN II Simulations
2. Pumping Schedule

12. SchlumbergerPrivate
12
CemCADE & WELLCLEAN II Simulations
HHP Requirement :
Dynamic Well Security
0 1 2 3 4
(x 1000) psi
Dynamic Well Security
Hydrostatic
Min. Hydrostatic
Max. Dynamic
Min. Dynamic
Frac
Pore
The HHP required for
the job is 227.4 hhp
2. Pumping Schedule

13. SchlumbergerPrivate
13
Flowrate Comparison (U-Tubing Effect)
CemCADE & WELLCLEAN II Simulations
0 20 40 60 80 100 120 140 160 180 200
Time (min)
9876543210
FlowRate(bbl/min)
Acquired Q Out
Acquired Q In
Q Out
Q In
Fluids at 4950 ft
2. Pumping Schedule

14. SchlumbergerPrivate
14
CemCADE & WELLCLEAN II Simulations
Well Head Pressure
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
Pumped Volume (bbl) (x 1000)
1.21.11.00.90.80.70.60.50.40.30.20.10
Surf.Press.(psi)(x1000)
Back Pressure
Acquired Pressure
Calc. CemHP
Calc. Pump Press.
2. Pumping Schedule

15. SchlumbergerPrivate
15
CemCADE & WELLCLEAN II Simulations
Effective Circulating Density (ECD)
0 20 40 60 80 100 120 140 160 180 200
Time (min)
3.53.43.33.23.13.02.92.82.72.62.52.42.3
Ann.Pressure(psi)(x1000)
Frac
Pore
Hydrostatic
Dynamic
Depth = 4948 ft
2. Pumping Schedule

16. SchlumbergerPrivate
16
CemCADE & WELLCLEAN II Simulations
3. Centralizer Placement
Centralizer Placement
Bottom MD
(ft)
Nbr. Cent. /
Joint
Cent. Name Code Min. STO
(%)
@ Depth
(ft)
2390.0 11 1/5 CT_31011001438S604C 100.0 2370.0
3030.0 8 1/2 CT_31011001438S604C 76.0 2810.0
4950.0 32 2/3 CT_31011001438S604C 76.0 4910.0
Number of Centralizers = 51

17. SchlumbergerPrivate
17
CemCADE & WELLCLEAN II Simulations
0 50 100 150 200
(x 1000) lb
Running Forces
Hookload Up
Hookload Dow n
Weight
Drag Force
3. Centralizer Placement0200040006000
ft
75.0 100.0
%
Pipe Standoff
Betw een Cent.
At Cent.

18. SchlumbergerPrivate
18
CemCADE & WELLCLEAN II Simulations
4. WELLCLEAN II Simulator
75.0 100.0
%
Cement Coverage
Std Betw . Cent.
Cement Coverage
0 25 50 75 100
%
Uncontaminated Slurry
Mud Contamination
Uncontaminated SlurryUncontaminated Cement Slurry
and Cement Coverage
WELLCLEAN II SIMULATOR

19. SchlumbergerPrivate
19
CemCADE & WELLCLEAN II Simulations
5. Temperature Simulator
0 25 50 75 100 125 150 175 200
Time (min)
140130120110100908070
ParticleHistory(degF)
00.51.01.52.02.53.03.54.04.55.0
Depth(ft)(x1000)
Last Sack Temp.
First Sack Temp.
API BHCT
Part. Temp. Hist.
Particle Injection Time = 0 min

20. SchlumbergerPrivate
20
Job Objectives
To bring the top of cement up to 4800.10 ft
Minimum WOC before tag TOC (Liner) as per UCA Chart
To provide a competent isolation around the liner overlap
To isolate the pay zone from 8074 to 9214 ft
7” PRODUCTION LINER DESIGN

21. SchlumbergerPrivate
21
Well Data & Schematics
10.750 in Csg
45.50 lbm/ft
4950 ft
9.875 in
10% Excess
9214 ft
5.000 in DP
19.50 lbm/ft
4700 ft
7.000 in Csg
26.00 lbm/ft
9214 ft Landing Collar
9134 ft
Spacer 1
29.99 bbl
Spacer 2
60.99 bbl
Disp. Fluid1
232.12 bbl
Tail
231.38 bbl
i- Handbook* - *a mark of Schlumberger
Created on 7/15/2010 8:09:22 AM

22. SchlumbergerPrivate
22
RISK ANALYSIS
Key risks Contingencies
- Cement setting inside the casing due to poor slurry
design and/or testing.
- Correct selection of temperature is critical. For deep-wells, computer
temperature simulations must be run to assess the temperatures
during placement and while the cement develops compressive
strength.
- Incorrect displacement volume, resulting in un-
desired cement left in pipe.
- Accurate displacement volumes are critical; cement pumps are
preferred, however, accuracy can be achieved using rig pumps with
known efficiencies.
- Cement does not achieve sufficient strength at the
shoe-track
- Allow a sufficient WOC, tagging the TOC prior final C.S. is achieved
is not recommended.
- Losses prior to the cementing job during mud
circulation
- CemNET* is recommended at concentration of 1.4 lb/bbl in order to
minimize losses while cementing.
- Severely washed out holes compromise mud removal
and therefore cement-to-formation bonding /
channeling
- The low annular velocities occurred in such cases will impact
drastically the isolation results and logging evaluation, viscous gelled
mud’s can cause substantial channeling; pipe rotation and effective
mud circulation prior to pumping cement will help to mobilize mud.
- Gas presence while drilling
- In the event of gas-cut, it is strongly advised to remove completely
any gas presence in the well prior to the cementing job; not doing this
will allow gas to percolate through the slurry up to surface (gas-leak).
- It is strongly advised to use gas control additives in the slurry design
in order to avoid gas channeling; not doing this will compromise
isolation results.

23. SchlumbergerPrivate
23
JOB PROCEDURE/RECOMMENDATIONS: (KSQR)
After finishing RIH liner, Flush lines & Pressure test to 5000 psi for 10 minutes
Start mud circulation @ 8.0 bbl/min for about 180.0 minto cool the temperature down
to the BHCT. Check mud returns, abnormal circulating pressure, losses, cavings, etc.
At the same time prepare pre-flush (as per lab report):
 30 bbl of CW8 @ 8.34 lb/gal
 61 bbl of MUDPUSH II @ 10.85 lb/gal (Check rheology of spacer)
Start batch mixing 231.4 bbl (pumpable) of LiteCRETE HP Slurry @ 12.5 lb/gal.
Stop mud circulation
Pumping sequence: Pumping Schedule
Name Flow Rate
(bbl/min)
Volume
(bbl)
Stage Time
(min)
CW 5.0 30.0 6.0
Spacer 5.0 40.0 8.0
LiteCRETE 5.0 231.4 46.3
Pause 0.0 0.0 10.0
Spacer 6.0 6.0 1.0
Mud 6.0 159.6 26.6
Spacer 6.0 15.0 2.5
Mud 6.0 62.5 10.4
Mud 2.0 10 5.0

24. SchlumbergerPrivate
24
Pumping time 01:55 min
If liner wiper plug doesn’t bump, pump ½ volume of the shoe-track
(agree this with Co. Man prior to the job)
Bleed off pressure, check returns
POOH up to 4600 ft (150 ft above Top of Liner), start mud circulation
- Job supervisor to witness mud circulation, cement returns, physical
check of the running tool, etc.
End of job
WOC as per UCA chart before attempting to tag TOC
JOB PROCEDURE/RECOMMENDATIONS: (KSQR)

25. SchlumbergerPrivate
25
JOB PROCEDURE/RECOMMENDATIONS: (KSQR)
Time Check
Fluids placement
time
(hr:min)
Minimum POOH
time (min)
KSQR policy
(min)
Mud Circulation
time (min)
Minimum
T.T.
Hr:Min
01:55 0:30 120 120 06:25
SQ contingency measures (KSQR 1.2):
When mixing any slurry every effort should be made to mix 80%
to 95% of the total slurry volume between the density fraction
tolerances (+/- 0.15 ppg):
Lower Limit: 12.35 ppg
Upper Limit: 12.65 ppg
Maximum shutdown time: 20 min

26. SchlumbergerPrivate
26
CemCADE & WELLCLEAN II Simulations
Fluid Sequence
Pumping Schedule
Name Flow Rate
(bbl/min)
Volume
(bbl)
Stage Time
(min)
Cum.Vol
(bbl).
Inj. Temp.
(degF)
Comments
CW 5.0 30.0 6.0 30.0 80
Spacer Slurry 5.0 40.0 8.0 40.0 80
7'' LC 5.0 231.4 46.3 231.4 80
Pause 0.0 0.0 10.0 0.0 80 36-Drop Dart
Spacer Slurry 6.0 6.0 1.0 6.0 80
Mud 6.0 159.6 26.6 159.6 80
Spacer Slurry 6.0 15.0 2.5 15.0 80
Mud 6.0 62.5 10.4 62.5 80
Mud 2.0 10.0 5.0 72.5 80
Code BVOB
G 30.7%
D181 50%
D209 6.3%
D178 13%
Additives
Code Conc. Function
D206 0.024 gal/sk Antifoam
D153 0.200 %BWOB Antisettling
D168 0.168 gal/sk Fluid loss
D600G 0.671 gal/sk GASBLOK
D080A 0.048 gal/sk SALTBOND II
D197 0.060 gal/sk Retarder

27. SchlumbergerPrivate
27
1. Fluid Sequence & Static Well Security
CemCADE & WELLCLEAN II Simulations
Well
7.5 10.0 12.5 15.0
lb/gal
Static Well Security
Hydrostatic
Frac
Pore

28. SchlumbergerPrivate
28
CemCADE & WELLCLEAN II Simulations
HHP Requirement :
The HHP required for
the job is 184 hhp
2. Pumping Schedule
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
(x 1000) psi
Dynamic Well Security
Hydrostatic
Min. Hydrostatic
Max. Dynamic
Min. Dynamic
Frac
Pore

29. SchlumbergerPrivate
29
Flowrate Comparison (U-Tubing Effect)
CemCADE & WELLCLEAN II Simulations
2. Pumping Schedule
0 25 50 75 100 125
Time (min)
76543210
FlowRate(bbl/min)
Acquired Q Out
Acquired Q In
Q Out
Q In
Fluids at 9214 ft

30. SchlumbergerPrivate
30
CemCADE & WELLCLEAN II Simulations
Well Head Pressure2. Pumping Schedule
0 25 50 75 100 125
Time (min)
1.41.21.00.80.60.40.20
Surf.Press.(psi)(x1000)
Back Pressure
Acquired Pressure
Calc. CemHP
Calc. Pump Press.

31. SchlumbergerPrivate
31
CemCADE & WELLCLEAN II Simulations
Effective Circulating Density (ECD)
2. Pumping Schedule
0 25 50 75 100 125
Time (min)
6.26.05.85.65.45.25.04.84.64.44.24.03.8
Ann.Pressure(psi)(x1000)
Frac
Pore
Hydrostatic
Dynamic
Depth = 9214 ft

32. SchlumbergerPrivate
32
CemCADE & WELLCLEAN II Simulations
3. Centralizer Placement
Centralizer Placement
Bottom MD
(ft)
Nbr. Cent. /
Joint
Cent. Name Code Min. STO
(%)
@ Depth
(ft)
4934.0 0 0/0 0.0 4966.6
6974.0 34 2/3 CT_3107130963S604C 65.8 6934.0
8974.0 40 4/5 CT_3107130963S604C 70.3 6991.5
9214.0 12 2/1 CT_3107130963S604C 83.2 9214.0
Number of Centralizers = 86

33. SchlumbergerPrivate
33
CemCADE & WELLCLEAN II Simulations
3. Centralizer Placement

34. SchlumbergerPrivate
34
CemCADE & WELLCLEAN II Simulations
4. WELLCLEAN II Simulator
Uncontaminated Cement Slurry
and Cement Coverage
WELLCLEAN II SIMULATOR
0 25 50 75 100
%
Cement Coverage
Std Betw . Cent.
Cement Coverage
0 25 50 75 100
%
Uncontaminated Slurry
Mud Contamination
Uncontaminated Slurry

35. SchlumbergerPrivate
35
CemCADE & WELLCLEAN II Simulations
5. Temperature Simulator
0 25 50 75 100 125
Time (min)
20017515012510075
ParticleHistory(degF)
00.51.01.52.02.53.03.54.04.55.0
Depth(ft)(x1000)
Last Sack Temp.
First Sack Temp.
API BHCT
Part. Temp. Hist.
Particle Injection Time = 0 min

36. SchlumbergerPrivate
36
GENERAL RECOMMENDATIONS
 Amount of Cement and additives to be calculated based on the final cementing
program
 Double check calculations the with CM before the job
 Perform risk assessment and discuss the contingency plans with the CM
 Any deviation to the design program MUST be notified to the EIC for risk assessment
 Pressurized mud balance must be used to check slurry density besides the electronic
densitometer
 Minimum 2 gallon of mix water sample for the tail slurry to be collected and stored
properly
 Slurry samples to be taken in different stages while pumping
CemCAT recording system is a Must Do,
All messages should be set at the start and at the end of each stage, no deviations are
allowed
Reset volume prior to start pumping a new fluid
CemCAT chart should be handed over to Co.Man as soon as it is possible

37. SchlumbergerPrivate
37
QHSE recommendations:
•Make sure that everybody knows the operating procedure.
•Define the working area (barriers, limits).
•All personal involved in operation should be wearing minimum PPE:
safety boots, helmet, safety glasses, ear plugs, Nomex coveralls.
•In case CemNET* is added to the slurry, extra PPE is required: dust
mask and robber gloves.
•Define contingency plans.
•Identify muster points.
•Mention to everybody the emergency response plan.
•Designate a driver and vehicle in case of an emergency
GENERAL RECOMMENDATIONS

38. SchlumbergerPrivate
38
EQUIPMENT
Air Compressor (2)
10-3/4” Cement Head
Water Tank

39. SchlumbergerPrivate
3939
Equipment Layout for 10 3/4’’ Casing
LC
LCG
LC
CPF
Lead
MF
240
bbl
RMX
Spacer(50BBL)
Tail
MF
40
bbl
Downhole

40. SchlumbergerPrivate
4040
Equipment Layout for 7’’ Liner
LCLC
=
CPF
Frec
h
water
RMX
LC HT 12.5 ppg
(240BBL) MUDPUSH II
(65BBL)
Downhole

41. SchlumbergerPrivate
41
To be provided by the Client:
10-3/4” Top & Bottom Plugs
51 Rigid Centralizer (Surface Casing Job)
86 Rigid Centralizers (Liner Job)
Dart
EQUIPMENT/PERSONNEL
Schlumberger Crew:
Supervisor (1)
Operator (2)
Helper (2)

42. SchlumbergerPrivate
42
SAFE OPERATION MANAGEMENT TOOLS
 Key Service Quality Requirement (KSQR )
 i-District: A custom resource management system for use in district operations
 JRI: Service Quality Job Risk Index identifies individual Service Quality risk
and the overall risk of the job. It must be completed prior to job starts.
 Hazard Analysis & Risk Control (HARC): A process used in Schlumberger for
Quality and HSE risk management, designed to analyze risk(s) prior to
performing activities and to define risk control measures in order to reduce the
risk.
 QUEST Management of Change (MOC)/Exemption: SLB QHSE Standard 10
 Material Safety Data Sheet (MSDS)
 Permit – To – Work
 Emergency Spill Kit/Contigency Plans

43. SchlumbergerPrivate
43
QHSE CONSIDERATION
 Quality, Health, Safety and Environment (QHSE), is the four (4)
business and operational attributes controlled by the Schlumberger
Management System
 Applicable WS QHSE Standards:
 WS Std 001 – Service Delivery
 WS Std 003 – Maintenance
 WS Std 005 – Wellsite Operation
 WS Std 018 – Chemical Product Management
 WS Std 023 – Testing & Inspection of Treating Equipment
 WS Std 30 – Mixing & Pumping of Combustible & Flammable Fluid

44. SchlumbergerPrivate
44
QUESTIONS & COMMENTS!!!