Schlum

berger-Private

Maximize Efficiency of Coiled Tubing-Conveyed Perforation with Advanced Gun

Deployment System and Real-Time Correlation in High-H2S/High-Pressure Wells

Schlumberger Rostislav Panferov, Timur Gafiyatullin

OUTLINE • Introduction

• Project challenges

• Appraisal

• Technology implementation

• Developed project approach

• Case study

• Conclusion

2

Schlumberger

Rostislav Panferov, Timur Gafiyatullin

INTRODUCTION

• Oilfield located in Kazakhstan, Caspian basin • Estimated Recoverable reserves 13 Bbls oil • Worlds biggest oil discovery since 1968 • Project scope:

‐ CT conveyed well perforation ‐ Gun Deployment system ‐ Commissioning – 14+3 wells ‐ Handle possible H2S on surface

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

PROJECT CHALLENGES

• Reservoir Conditions - Hostile reservoir conditions: HP and Ultra High H2S 15-20%

- NO fluid influx, H2S release or Well Flow allowed

- BHP – above 10000 psi, WHP – 7500 psi

• Environment - Ambient Temperature vary −40 °C to +50 °C

- Ultra shallow water, ice blocked in winter season,

- 150 km remote from onshore, sensitive eco-system

• Unique Technology Requirements - 15K 5.125” H2S rated Surface equipment

- Customized H2S rated perforation system

- Emergency redundant downhole disconnection system

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

APPRAISAL

• Comprehensive risk analysis - High H2S concentration

- Well Integrity, double barrier requirement

- Chrome completion

- Well depth and tortuosity

- Well fluid influx and no-flow policy

• Technology challenges - Gun conveyance method analysis

- Tool string selection and survivability after detonation

- Precise real time depth control

- Potential H2S handling at surface

- Corrosion prevention and mitigation plan

- Fishing contingencies

- PCE configuration for perforation

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

TECHNOLOGY IMPLEMENTATION

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Schlumberger

Rostislav Panferov, Timur Gafiyatuliin

• Gun deployment system

- New design H2S rated 5-1/8” 15000 psi deployment stack - H2S rated set of aligning connectors, swivels, adaptors for guns

• Perforation Tool string - Redundant disconnect system: electrical and mechanical - Shock resistant H2S-rated CT logging head - H2S-rated Shock absorbers - Rounded scallop HP guns, orienting featured

• Electric line enabled CT system - Electric line injected in CT - GR/CCL real time readings - Tension/Compression readings optional - Electrical disconnect device - Electrical detonator initiation

TECHNOLOGY IMPLEMENTATION - CONTINUE

• Advanced gun deployment system - Remotely connects / disconnect perforation connectors - Hold gun string weight - Able to work under pressure - 3 components connector: lock sleeve / slick joint / stinger - Sealed ballistic transfer - Set of aux components: retrieval / deployment ballistic / flow

through

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

DEVELOPED PROJECT APPROACH

• PCE configuration design - Tailored for conveyance guns in double and trebles

- Designed for 3 different rig and 2 rigless interventions

- Fully compatible for all fishing scenarios

- All contingency safety precautions included

- New approach to “in scale” PCE space out design

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

16

.61

25

.75

Bottom of R/T

(lowest beam)

0.4

4

Crossover

Ground level

2.4

7

2.7

6

Top of R/T

0.3

7

3.0

2

UMV- hydraulic

1.9

9

Xmass tree system 4

LMV- manual 2.3

6

5.5

4 6.7

6 8.0

1

10

.00

26

.43

17

.65

32.6

8

13

.86

1.1

4

Crossover

0.3

3

39

.89

BOP Deck Top

4.4

2

10

.49

3.1

1

0.4

8

6.7

3

1.1

2

Cutter valve

Crossover

0.3

8

Injection Sub

0.3

9

5.5

0

Injector Head

with goose neck 120"

1.7

1 Dual side door stripper

0.9

8

5-1/8" Dual Combi BOP

(Pipe/Slip+Shear/Seal)

0.8

08

.32

0.5

1

BOP Deck Bottom

3.9

2

0.5

0

9.4

3

0.8

6

6.3

43.5" HSD gun, 20 ft

0.5

7

2.8" CIRP stinger

0.7

5

2.8" CIRP connector

4.6

1

0.7

5

2.8" CIRP connector

0.5

7

2.8" CIRP stinger

2.8" CIRP connector

6.3

43.5" HSD gun, 20 ft

4.6

14

.31

3.5" HSD gun, 4 m

6.3

43.5" HSD gun, 20 ft

0.8

6

2.8" CIRP connector

0.7

0

1.5

4

5-1/8" QUAD BOP

(Blind-Shear-Slip-Pipe

rams)

5-1/8" Gate valve

0.8

9

5-1/8" Quick test sub0.9

3

5-1/8" Flow cross w/ 2-1/

16" gate valves

0.6

4

3.0

4

5-1/8" 10 ft Riser

3.0

4

5-1/8" 10 ft Riser

5-1/8" Gate valve0.8

9

5-1/8" Pressure Point flange w/

Pressure Transducer

0.2

0

0.8

9

5-1/8" Gate valve

1.2

5

CIRP deployment stack

3.0

4

5-1/8" 10 ft Riser

1.8

2

5-1/8" 6 ft Riser

3.0

4

5-1/8" 10 ft Riser

1.2

2 5-1/8" 4 ft Riser

1.8

2

5-1/8" 6 ft Riser

2.4

4 5-1/8" 8 ft Riser

TECHNICAL APPROACH - CONTINUE

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

CT software and hardware design

Perforation software and hardware design

Multi-service hardware design

CT force analysisCT logging head

equipment selection

WL cable and logging/perforation equipment selection

Gun OD, phasing, shot density,

charges

Gun loading diagram design

Dynamic underbalance effect

and shock load

Working envelope vs shock load

Shock absorbers and weak points set

up

Perforation fast gauge set up

CT, WL and perforation post-run data analysis

CT Force analysis correction for upcoming runs

Perforation fast gauge data analysis

and shock simulation

Tool string condition after

POOH

Shock model

CoilCADE model

WL ToolPlanner

CoilCAT monitoring

CT logging head

WL logging tools

Firing head and perforation tool

string

CASE STUDY

• Well generic description – Oil producer

– Carbonate formation

– Chrome completion

– Long deviated section

– BHP above 11000 psi

• Perforation objectives – Dead well deployment of gun (17-20) string with CT

– Convey to perforation interval (squeeze mode)

– GR/CCL correlation

– Overbalance perforation with DUB effect

– POOH with maintained pressure

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

CASE STUDY - CONTINUE

• Acquisition job data analysis – Weight stability

– Applied pressure during RIH/POOH

– Speed limitations vs completion jewelry

– Tool string gained weight after perforation

– Cumulative metal fatigue and abrasion of CT

• CT post-run force analysis – Compared predicted and actual weigh

readings

– Adjustment of friction coefficients

– Friction reducers / well fluid / CT pressure values

– Upcoming runs simulations adjustment

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

CASE STUDY - CONTINUE

• Shock Analysis Correlation – Recover recorded pressure data

– Compare Pressure during DUB

– Adjust pressure and shock load simulation

– Adjustment of upcoming runs

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

• Detonation Indication Verification – Pressure monitoring at surface and downhole

– CT weight indicator readings

– WL signal after detonator initiation

– Physical impact and CT movement at surface

CONCLUSION

• Seamless integration of e-line-enabled CT perforation method with the advanced gun deployment system

• Perforation in controlled way with well integrity and influx management under anticipated operational parameters

• Reliability of electrical and mechanical disconnect combination in one tool string

• Service quality through developed design and execution systematic approach

• Proven solution for high H2S / high pressure environment

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Schlumberger

Rostislav Panferov, Timur Gafiyatullin

Thank you!

Questions?

Schlumberger

Rostislav Panferov, Timur Gafiyatullin