gnwafor group 1 project

VINITA 1B – 23 WELLSURFACE CASING & LINER CEMENTINGDESIGN PROPOSAL

Christopher Phillips, Godwin Nwafor, Adam Vondal, Bilal Khelfaoui

Schlumberger Private

2

GENERAL OVERVIEW

2. Job Execution

3. Job Evaluation

1 Job Design


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

10 ¾‘” SURFACE CASING DESIGN

Job ObjectivesTo bring top of cement up to surfaceTo provide a competent shoe-track to be able drilling the next sectionWait until surface samples harden to resume drilling


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

RISK ANALYSISKey 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

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

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

CemCADE & WELLCLEAN II SimulationsFluid 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

CemCADE & WELLCLEAN II Simulations1. Fluid Sequence & Static Well Security

020

0040

0060

00

ft

Well

8 10 12 14lb/gal

Static Well Security

HydrostaticFracPore


11

Pumping ScheduleName

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 Simulations2. Pumping Schedule


12

CemCADE & WELLCLEAN II Simulations

HHP Requirement :

Dynamic Well Security0 1 2 3 4

(x 1000) psi

Dynamic Well Security

HydrostaticMin. HydrostaticMax. DynamicMin. DynamicFracPore

The HHP required for the job is 227.4 hhp

2. Pumping Schedule


13

Flowrate Comparison (U-Tubing Effect)


0 20 40 60 80 100 120 140 160 180 200Time (min)

98

76

54

32

10

Flow

Rat

e (b

bl/m

in)

Acquired Q OutAcquired Q InQ OutQ In

Fluids at 4950 ft

2. Pumping Schedule


14

CemCADE & WELLCLEAN II SimulationsWell 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 1.2Pumped Volume (bbl) (x 1000)

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0S

urf.

Pre

ss. (

psi)

(x 1

000)

Back PressureAcquired PressureCalc. CemHPCalc. Pump Press.

2. Pumping Schedule


15

CemCADE & WELLCLEAN II SimulationsEffective Circulating Density (ECD)

0 20 40 60 80 100 120 140 160 180 200Time (min)

3.5

3.4

3.3

3.2

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

Ann

. Pre

ssur

e (p

si)

(x 1

000)

FracPoreHydrostaticDynamic

Depth = 4948 ft

2. Pumping Schedule


16

CemCADE & WELLCLEAN II Simulations3. Centralizer Placement

Centralizer PlacementBottom 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


0 50 100 150 200 (x 1000) lb

Running Forces

Hookload UpHookload Dow nWeightDrag Force

3. Centralizer Placement0

2000

4000

6000

ft 75.0 100.0%

Pipe Standoff

Betw een Cent.At Cent.


18

CemCADE & WELLCLEAN II Simulations4. WELLCLEAN II Simulator

75.0 100.0%

Cement Coverage

Std Betw . Cent.Cement Coverage

0 25 50 75 100%

Uncontaminated Slurry

Mud ContaminationUncontaminated SlurryUncontaminated Cement Slurry

and Cement Coverage

WELLCLEAN II SIMULATOR


19

CemCADE & WELLCLEAN II Simulations5. Temperature Simulator

0 25 50 75 100 125 150 175 200Time (min)

140

130

120

110

100

9080

70P

artic

le H

isto

ry (d

egF)

00.

51.

01.

52.

02.

53.

03.

54.

04.

55.

0D

epth

(ft)

(x 1

000)

Last Sack Temp.First Sack Temp.API BHCTPart. Temp. Hist.

Particle Injection Time = 0 min


20

Job ObjectivesTo bring the top of cement up to 4800.10 ftMinimum WOC before tag TOC (Liner) as per UCA ChartTo provide a competent isolation around the liner overlapTo isolate the pay zone from 8074 to 9214 ft

7” PRODUCTION LINER DESIGN


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

Created on 7/15/2010 8:09:22 AM


22

RISK ANALYSISKey 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

JOB PROCEDURE/RECOMMENDATIONS: (KSQR)After finishing RIH liner, Flush lines & Pressure test to 5000 psi for 10 minutesStart mud circulation @ 8.0 bbl/min for about 180.0 min to 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 circulationPumping sequence:


Flow Rate (bbl/min)

Volume (bbl)

Stage Time (min)

CW 5.0 30.0 6.0Spacer 5.0 40.0 8.0

LiteCRETE 5.0 231.4 46.3Pause 0.0 0.0 10.0

Spacer 6.0 6.0 1.0Mud 6.0 159.6 26.6

Spacer 6.0 15.0 2.5Mud 6.0 62.5 10.4Mud 2.0 10 5.0


24

Pumping time 01:55 minIf 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 returnsPOOH 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 jobWOC as per UCA chart before attempting to tag TOC

JOB PROCEDURE/RECOMMENDATIONS: (KSQR)


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

CemCADE & WELLCLEAN II SimulationsFluid Sequence


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%

AdditivesCode Conc. FunctionD206 0.024 gal/sk AntifoamD153 0.200 %BWOB AntisettlingD168 0.168 gal/sk Fluid lossD600G 0.671 gal/sk GASBLOKD080A 0.048 gal/sk SALTBOND IID197 0.060 gal/sk Retarder


27

1. Fluid Sequence & Static Well SecurityCemCADE & WELLCLEAN II Simulations

Well

7.5 10.0 12.5 15.0lb/gal

Static Well Security

HydrostaticFracPore


28


HHP Requirement :The HHP required for the job is 184 hhp

2. Pumping Schedule0 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

HydrostaticMin. HydrostaticMax. DynamicMin. DynamicFracPore


29

Flowrate Comparison (U-Tubing Effect)

CemCADE & WELLCLEAN II Simulations2. Pumping Schedule

0 25 50 75 100 125Time (min)

76

54

32

10

Flow

Rat

e (b

bl/m

in)

Acquired Q OutAcquired Q InQ OutQ In

Fluids at 9214 ft


30

CemCADE & WELLCLEAN II SimulationsWell Head Pressure2. Pumping Schedule

0 25 50 75 100 125Time (min)

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0S

urf.

Pre

ss. (

psi)

(x 1

000)

Back PressureAcquired PressureCalc. CemHPCalc. Pump Press.


31

CemCADE & WELLCLEAN II SimulationsEffective Circulating Density (ECD)2. Pumping Schedule

0 25 50 75 100 125Time (min)

6.2

6.0

5.8

5.6

5.4

5.2

5.0

4.8

4.6

4.4

4.2

4.0

3.8

Ann

. Pre

ssur

e (p

si)

(x 1

000)

FracPoreHydrostaticDynamic

Depth = 9214 ft


32


Centralizer PlacementBottom 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



34

CemCADE & WELLCLEAN II Simulations4. 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 ContaminationUncontaminated Slurry


35

CemCADE & WELLCLEAN II Simulations5. Temperature Simulator

0 25 50 75 100 125Time (min)

200

175

150

125

100

75P

artic

le H

isto

ry (d

egF)

00.

51.

01.

52.

02.

53.

03.

54.

04.

55.

0D

epth

(ft)

(x 1

000)

Last Sack Temp.First Sack Temp.API BHCTPart. Temp. Hist.

Particle Injection Time = 0 min


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 allowedReset volume prior to start pumping a new fluidCemCAT chart should be handed over to Co.Man as soon as it is possible


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: dustmask 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

EQUIPMENT

Air Compressor (2)10-3/4” Cement HeadWater Tank


3939

Equipment Layout for 10 3/4’’ Casing

LC

LCG

LC

CPF

Lead MF240 bbl

RMX

Spacer(50BBL)

Tail MF40 bbl

Downhole


4040

Equipment Layout for 7’’ Liner

LCLC

=

CPF

Frech water

RMX

LC HT 12.5 ppg (240BBL) MUDPUSH II

(65BBL)

Downhole


41

To be provided by the Client:10-3/4” Top & Bottom Plugs51 Rigid Centralizer (Surface Casing Job)86 Rigid Centralizers (Liner Job)Dart

EQUIPMENT/PERSONNEL

Schlumberger Crew:Supervisor (1)Operator (2)Helper (2)


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

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

QUESTIONS & COMMENTS!!!

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