Well B14 / Operator X

Mediterranean Sea / Operator XWell B14

Schlumberger Well Integrity Team

Mohamed El-SadekAhmed El-GamalMoustafa Rakha

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Well B14 / Operator X

Agenda

B14 Project Introduction

Client Objectives

Challenges

Work Flow

Conclusion& Recommendations

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Well B14 / Operator X

Introduction

- Location: Mediterranean Sea, Egypt

- Well Name : B14

- Operator: X

- Well B14 was drilled with several drilling problems

A14 B14Well A 14 Well B14

Gas Cap at 3702 ft. The well plan was based on Well A14

Reservoir X P = 1300 psia

Reservoir Y P = 2500 psia

Water level at 5000 ft.

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Well B14 / Operator X

Intermediate Casing 9 5/8’’

Total mud losses reported No open hole logs Liner was run with no

centralizers Cemented with 11.5 ppg

lead and 15.8 ppg tail

- Well Sktech

X

Y

B14 Well Schematic

2800 ft.

3702 ft.

1700 ft.

Gas Cap

5000 ft. Water

Liner Casing 7’’

Introduction

Drilled with 16 ppg OBM containing barite

Cemented with 15.8 ppg Existing Fractures

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Well B14 / Operator X

A. Cement evaluation for to the entire zone of interest to ensure:

1. Zonal isolation between reservoirs Y and X

2. Hydraulic isolation from water zone and gas cap

Client Objectives

B. Completion system design to support production using choke size

44/64 with flowing pressure 800 to 900 psi and sand production.

C. Plug and abandonment plan

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Well B14 / Operator X

Fractures in intermediate section

Absence OH logs

Liner ran without centralizers

No Cement Execution Report

Challenges

- Well Sktech

X

Y

Well Schematic

2800 ft.

5000 ft.

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Well B14 / Operator X

Work Flow

Data gathering Planning Execution

Results &

recommendations

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Well B14 / Operator X

TT= 15µs/cm

Zcement=

Zcement = 2.33 Mrayl

Planning phase

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Well B14 / Operator X

2.3

USIT limitation

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Well B14 / Operator X

Isolation Scanner

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Well B14 / Operator X

Liquid

Light weight cement

SLG Map

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Well B14 / Operator X

Identifying barite and solid accumulations

Differentiate between light weight cement & liquid

Assess hydraulic isolation

Third interface echoes “TIEs”

Other Applications

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Well B14 / Operator X

Log header

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Well B14 / Operator X

Execution phase

Gas cap

Water level

Perf X

Perf Y

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Well B14 / Operator X

Gas cap- PerfX

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Well B14 / Operator X

SLG Map

No Perforation at X

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Well B14 / Operator X

X-Perf Y- Water zone

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Well B14 / Operator X

SLG Map

Perforate at zone Y

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Well B14 / Operator X

Completion program

• Single completion • Quantum PerfPac• Chock size

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Well B14 / Operator X

Plug& Abandonment

What if the well is dry?

- Well Sktech

X

Y

Well Schematic

1700 ft.

2800 ft. Depth selection criteria:

1. Good centricity 2. Free pipe

B14 Well Schematic

Where to cut and retrieve?

Cut across the dual casing

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Well B14 / Operator X

Example of a bad point to cut the 9 5/8’’ casing

At depth 156 ft. - Cement presence- Contact points

Plug& Abandonment

Depth Selection

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Well B14 / Operator X

At interval 910 ft. to 960 ft.- Solid presence

Plug& Abandonment

Depth Selection

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Well B14 / Operator X

At interval 410 ft. to 435 - No solid presence- Good centralization

Plug& Abandonment

Depth Selection

Looks good !

Recommended Depths: 415 ft. / 420 / 425 ft. / 430 ft.

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Well B14 / Operator X

1. No hydraulic isolation between gas cap and perforation X

2. Good hydraulic isolation between formation Y and both water zone and

formation X

3. Single completion and Quantum Perf Pac System

4. Recommended depths for P&A operastion are 415 ft. / 420 /

425 ft. / 430 ft.

Conclusion

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Well B14 / Operator X

1. Consulting our Geomechanics team to investigate wellbore

stability issues.

2. Acquiring OH logs, and Imaging tools for fracture analysis and

correct cement calculations.

3. Centralizers are recommended in deviated wells for a good

cement job.

Recommendations

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Well B14 / Operator X

Thank youAny questions?

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