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ARPO

ENI S.p.A. Agip Division

ORGANISING DEPARTMENT

TYPE OF ACTIVITY'

ISSUING DEPT.

DOC. TYPE

REFER TO SECTION N.

PAGE.

1

OF

230

STAP TITLE

P

1

M

6100

DRILLING DESIGN MANUAL

DISTRIBUTION LIST Eni - Agip Division Italian Districts Eni - Agip Division Affiliated Companies Eni - Agip Division Headquarter Drilling & Completion Units STAP Archive Eni- Agip Division Headquarter Subsurface Geology Units Eni - Agip Division Headquarter Reservoir Units Eni - Agip Division Headquarter Coordination Units for Italian Activities Eni - Agip Division Headquarter Coordination Units for Foreign Activities

NOTE: The present document is available in Eni Agip Intranet (http://wwwarpo.in.agip.it) and a CD-Rom version can also be distributed (requests willbe addressed to STAP Dept. in Eni - Agip Division Headquarter) Date of issue: „ ƒ ‚ • € Issued by P. Magarini E. Monaci 28/06/99 REVISIONS PREP'D C. Lanzetta 28/06/99 CHK'D A. Galletta 28/06/99 APPR'D 28/06/99

The present document is CONFIDENTIAL and it is property of AGIP It shall not be shown to third parties nor shall it be used for reasons different from those owing to which it was given ARPO

ENI S.p.A. Agip Division

IDENTIFICATION CODE

PAGE

2 OF 230

REVISION STAP-P-1-M-6100 0

INDEX
1. INTRODUCTION
1.1. 1.2. 1.3. PURPOSE AND OBJECTIVES IMPLEMENTATION UPDATING, AMENDMENT, CONTROL& DEROGATION

9
9 9 9

2.

PRESSURE EVALUATION
2.1. 2.2. FORECAST ON PRESSURE AND TEMPERATURE GRADIENTS OVERPRESSURE EVALUATION 2.2.1. Methods Before Drilling 2.2.2. MethodsWhile Drilling 2.2.3. Real Time Indicators 2.2.4. Indicators Depending on Lag Time 2.2.5. Methods After Drilling TEMPERATURE PREDICTION 2.3.1. Temperature Gradients 2.3.2. Temperature Logging

10
10 11 12 12 13 14 16 19 20 20

2.3.

3.

SELECTION OF CASING SEATS
3.1. 3.2. 3.3. 3.4. 3.5. CONDUCTOR CASING SURFACE CASING INTERMEDIATE CASING DRILLING LINER PRODUCTION CASING

21
24 24 24 2525

4.

CASING DESIGN
4.1. 4.2. 4.3. INTRODUCTION PROFILES AND DRILLING SCENARIOS 4.2.1. Casing Profiles CASING SPECIFICATION AND CLASSIFICATION 4.3.1. Casing Specification 4.3.2. Classification Of API Casing MECHANICAL PROPERTIES OF STEEL 4.4.1. General 4.4.2. Stress-Strain Diagram NON-API CASING CONNECTIONS 4.6.1. API Connections APPROACH TO CASING DESIGN 4.7.1. Wellbore Forces 4.7.2.Design Factor (DF) 4.7.3. Design Factors

26
26 27 27 28 28 29 29 29 29 31 32 32 33 33 34 35

4.4.

4.5. 4.6. 4.7.

ARPO

ENI S.p.A. Agip Division

IDENTIFICATION CODE

PAGE

3 OF 230

REVISION STAP-P-1-M-6100 0
35 36 36 39 42 43 43 45 46 47 47 47 49 50 52 52 53 55 56 57 58 59 60 60 60 61 63 63 64 68 68 69 69 69 70 70 71

4.7.4. 4.8.

Application of Design Factors

DESIGNCRITERIA 4.8.1. Burst 4.8.2. Collapse 4.8.3. Tension BIAXIAL STRESS 4.9.1. Effects On Collapse Resistance 4.9.2. Company Design Procedure 4.9.3. Example Collapse Calculation

4.9.

4.10. BENDING 4.10.1. General 4.10.2. Determination Of Bending Effect 4.10.3. Company Design Procedure 4.10.4. Example Bending Calculation 4.11. CASING WEAR 4.11.1. General 4.11.2. Volumetric Wear Rate 4.11.3. WearFactors 4.11.4. Wear Allowance In Casing Design 4.11.5. Company Design Procedure 4.12. SALT SECTIONS 4.12.1. Company Design Procedure 4.13. CORROSION 4.13.1. Exploration And Appraisal Wells 4.13.2. Development Wells 4.13.3. Contributing Factors To Corrosion 4.13.4. Casing For Sour Service 4.13.5. Ordering Specifications 4.13.6. Company Design Procedure 4.14. TEMPERATURE EFFECTS 4.14.1. LowTemperature Service 4.15. LOAD CONDITIONS 4.15.1. Safe Allowable Pull 4.15.2. Cementing Considerations 4.15.3. Pressure Testing 4.15.4. Company Guidelines 4.15.5. Hang-Off Load (LH)

5.

MUD CONSIDERATIONS
5.1. 5.2. GENERAL DRILLING FLUID PROPERTIES 5.2.1. Cuttings Lifting 5.2.2. Subsurface Well Control 5.2.3. Lubrication 5.2.4. Bottom-Hole Cleaning 5.2.5. Formation Evaluation 5.2.6. Formation...
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