TENARIS UNIVERSITY - INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES FOR ASSURING STRUCTURAL RELIABILITY ON OCTG PRODUCTS

INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES FOR ASSURING STRUCTURAL RELIABILITY ON OCTG PRODUCTS

F. Daguerre, M. Merliahmad, M. Tivelli

Technica Technicall Assistance Assistance - South South East Asia Asia

Introduction Conceptual Vision Well Challenges

Failure – Lack of Structural Failure Struct ural Reli ability ityy Structu ral Reliabil Relia Reliabilit bility

Well Design (Load cases – Environment …)

Exploration Drilling (Associated services)

Casing + Cementing

Completion Production etc

DMF 4th Petroleum Forum

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Introduction Conceptual Vision Well Challenges Well Design

Corrosion& Cracking Resistance

(Load cases – Environment …)

Mult ltia iaxi xial al Lo Load ads s Mu Exploration Drilling (Associated services)

Casing + Cementing

Thermal profile Fluid dynamics Interaction fluids & materials

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Mechanical Properties

Structural Performance

Dimensions

Working Conditions



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Introduction From needs to requirements Well Challenges Well Design (Load cases – Environment …)


•API 5CT/ISO 11960

W


Casing + Cementing

•NACE MR0175 /ISO15156

•API 5C3 / ISO 10400


•API 5C5 / ISO13679 •Proprietary specs.



Dimensions

Working Conditions



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Introduction From needs to requirements Well Challenges Well Design (Load cases – Environment …)



W


Casing + Cementing

•NACE MR0175 /ISO15156

•API 5C3 / ISO 10400


•API 5C5 / ISO13679 •Proprietary specs.



Dimensions

Working Conditions



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Material Performance Material Properties



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•API 5CT/ISO 11960 Ys Range [ksi]

40 45 50 55 60 65

Group I

H40

70

75

80

85

90

95

100 105 110 115 120 125 130 135 140 145 150

Max HRC

J55 - K 55 N80 Type1 & N80Q Group II

22

M65

23

L80

25,4

C90 C95 T95 Group III

P110

Group IV


25,4

Q125

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•API 5CT/ISO 11960 6.2 Heat Treatment 7.1 Chemical Composition 7.10. Hardenability 7.11 Grain size


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Dimensions

Working Conditions


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Material Performance


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Material Performance


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•API 5CT/ISO 11960 Corrosion& 6.2 Heat Treatment Cracking Resistance 7.1 Chemical Composition W o s 7.10. Hardenability r n k o i i n t i g l e e d 7.11 Grain size c a x i n n r p L C

o n e i t e m a C o a e c f d t r g a i t n M r n f o i i o n Product c k e y r s P o Performance W



Dimensions

Working Conditions

7.2 Tensile properties 7.3-7.-6 Charpy V-notch test 7.8 Hardness variation 7.14 Sulfide stress cracking DMF 4th Petroleum Forum

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Material Performance Sulfide Stress Cracking Resistance

•NACE MR0175 /ISO15156-2


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Material Performance Sulfide Stress Cracking Resistance

•NACE MR0175 /ISO15156 Corrosion& Cracking Resistance

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Dimensions

Working Conditions

In

environments containing H2S, hydrogen embrittlement, Sulfide Stress Cracking could suddenly occur DMF 4th Petroleum Forum

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Material Performance Sulfide Stress Cracking Resistance Factors interacting in the performance of steels 1. Chemical composition, method of manufacture, product form, strength, hardness of the material and its local variations, amount of cold work, heat-treatment condition, microstructure, microstructural uniformity, grain size and cleanliness of the material; 2.

H2S Partial pressure in gas or equivalent concentration in water phase.

3. Acidity (in situ pH) of the water phase. 4. Chloride ion concentration in the water phase 5. Presence of sulfur or other oxidants 6. Exposure to non-production fluids 7. Exposure to temperature 8. Total tensile stress: applied stress plus residual stress. 9. Exposure time. DMF 4th Petroleum Forum

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Material Performance Sulfide Stress Cracking Resistance H2S pp > 0,3Kpa (0,05psi)


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•API 5CT/ISO 11960 Risk Concern ?

•Supplementary Requirements

•Product specification Level

Improve Structural Reliability

•Mechanical Properties •Statistical testing •NDT acceptance criteria •Inspection Frequencies

Statistical analysis of impact testing SR16. Impact testing (Charpy V-notch) for pipe H.2.2 Grade N80Q, PSL-3 (6.2.2). Only N80Q shall be furnished for PSL-3. H.4. PSL2 C90, T95, Q125. Chemical composition shall be Type 1. H.5 Yield strength - Q125, PSL-3. The maximum yield strength shall be 140 ksi H.6.1. PSL2. Charpy, minimum 75% shear area. H.7. PSL2 L80 Type 1: Hardenability 90%. PSL3 C90 & T95: 95% H.9 Sulfide stress-cracking - PSL-3. Method A testing with a load of 90% SMYS. SR12.


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Material Performance Structural Performance


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Dimensions

Working Conditions


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•API 5C3 / ISO 10400 Corrosion& Cracking Resistance

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Dimensions

Working Conditions


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•API 5C3 / ISO 10400 Classical

approach, deterministic, smooth body continuous mechanics

Statistical

approach, realizing the variability of product parameters

depending no actual process control capabilities Influence

of imperfections and material fracture toughness in the

product rupture.


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•API 5C3 / ISO 10400 

6 Triaxial yield of pipe body



7 Ductile rupture of the pipe body



8 External pressure resistance



9 Joint strength



Annex B (inf.) Discussion of equations for ductile rupture



Annex D (inf.) Discussion of equations for fracture



Annex F (inf.) Development of probabilistic collapse performance properties



Annex G (inf.) Calculation of design collapse strength from collapse test data



Annex K (inf.) Tables of calculated performance properties in SI units


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•API 5C3 / ISO 10400 

6 Triaxial yield of pipe body Internal Yield

+

Internal Pressure

_ Ys

Ys

Compression

+

Tension

External Yield

_ External Pressure 23 May 2011


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•API 5C3 / ISO 10400 

Annex F (inf.) Development of probabilistic collapse performance properties


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•API 5C3 / ISO 10400   

7 Ductile rupture of the pipe body Annex B (inf.) Discussion of equations for ductile rupture Annex D (inf.) Discussion of equations for fracture

Final

failure must consider the imperfection acceptance levels

Annexes

K and L: Burst for P110 at 12,5 % and at a 5 % NDT inspection level. Supplementary

requirements, like SR2, or PLS 2 /3 in API 5CT – ISO 11960 for a higher structural reliability becomes evident. Rupture

could be ductile or fragile, with different mechanisms and quite different load levels. H2S

will affect the actual toughness and then special formulas are to be considered. Several work is ongoing in this regards. DMF 4th Petroleum Forum

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•API 5C5 / ISO 13679 Corrosion& Cracking Resistance

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Dimensions

Working Conditions


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•API 5C5 / ISO 13679 For API connections, round and buttress, the main characteristics are covered in API TR 5C3 / ISO TR 10400 and tabulated in Annexes K and L. The type of conditions in which they are used and their limitations to “low pressure, no critical services” are widely recognized. API 5C5 / ISO 13679, that establishes minimum design verification testing procedures and acceptance criteria for casing and tubing premium connections


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•API 5C5 / ISO 13679 It categorizes test severity into four test classes. Cal

I, for liquid service, testing at room temperature without external pressure and bending optional. Cal

II adds thermal cycling with a cumulative exposure of 5 h to gas at 135 °C. Cal

III, for gas and liquid service, includes external pressure in the cycling testing. Cal

IV, for most severe application includes bending, and thermal/pressure-tension cycling with cumulative exposure of about 50 h to gas at 180 °C.


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Validation Tests ISO 13679 – Galling Evaluation & Seal capacity under combined loads

E C N A T S I S E R G N I L L A G

Specimen preparation

Specimen 1

Specimen 2

Specimen 3

Thread-seal interference

H-L

L-L

H-H

Thread taper

PSBF

PSBF

NOM-NOM

PFBS

MU (A)

MU (A)

MU (A)

7.2.2

7.2.2

7.2.2

H/L

H/H

H/H

RRG (B) 7.2.4 L/H

Make and

Specimen 4

Specimen 5

Specimen 6

Specimen 7

H-L

L-H

L-H

PSBF

PSBF

PFBS

PFBS

MU (A)

MU (A)

MU (A)

MU (A)

MU (A)

7.2.2

7.2.2

7.2.2

7.2.2

7.2.2

H/H

H/L

H/H

H/L

H/L

RRG (B)

RRG (B)

RRG (B)

7.2.4

7.2.4

7.2.4

L/H

L/H

L/H

L-H H-L 8 SPECIMENS

Specimen 8

break properties

Amount thread compound/torque shown in each block

MBG (B)

MBG (B)

MBG (B)

MBG (B)

7.2.3

7.2.3

7.2.3

7.2.3

L/H

L/H

L/H

L/H

FMU (B)

FMU (B)

FMU (B)

FMU (B)

FMU (B)

FMU (B)

FMU (B)

FMU (B)

7.2.5

7.2.5

7.2.5

7.2.5

7.2.5

7.2.5

7.2.5

7.2.5

H/L

H/H

H/H

H/H

H/L

H/H

H/L

H/L

Bake

Bake

Bake

Bake

Bake

Bake

Bake

Bake

Bake

CAL II, III, IV

7.3.2

7.3.2

7.3.2

7.3.2

7.3.2

7.3.2

7.3.2

7.3.2

T/C pi/po

T/C pi/po

T/C pi/po

T/C pi/po

7.3.3

7.3.3

7.3.3

7.3.3

D E S N I D B A O M L O C

Series A

Series B

T/C pi w B

T/C pi w B

T/C p i w B

T/C pi w B

7.3.4

7.3.4

7.3.4

7.3.4

Thermal Cycle 7.3.5

Thermal Cycle 7.3.5

Thermal Cycle 7.3.5

Thermal Cycle 7.3.5

Structural tests

Failure test

Failure test

Failure test

Failure test

Failure test

Failure test

Failure test

Failure test

CAL

pih+T to F

C+po to F

T to F

po+C to F

T+pi to F

pi+C to F

po to F

pil+T to F

IV & III

7.5.1

7.5.2

7.5.3

7.5.6

7.5.7

7.5.8

Path No.

P1

P2

P3

P6

P7

P8

Series C

th

DMF 4 Petroleum Forum

FAILURE TESTS7.5.5 7.5.4 P4

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•API 5C5 / ISO 13679 20.0 Load Points Collapse Pressure

15.0

95% VMES 100% VMES (Yield)

10.0

i s k [

e r u s-3,000 s e r P

5.0 0.0 -2,000

-1,000

0

1,000

2,000

3,000

-5.0 -10.0 -15.0 -20.0

Test Failure

Axial L o ad [ki p s]


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Conclusions From needs to requirements

International

Standards and Recommended Practice assure the structural reliability. The

application of these documents a sound engineer judgment for each application.


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Some

cases are not considered in these Mechanical documents, and as stated in API 5CT / ISO Properties 11960 introduction:


Dimensions

Working Conditions

“Users of this International Standard should be aware that further or differing requirements may be needed for individual applications”.


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TENARIS UNIVERSITY - INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES FOR ASSURING STRUCTURAL RELIABILITY ON OCTG PRODUCTS

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