Transcript DCB performance of C125. F Legay-V-M

VALLOUREC MANNESMANN OIL & GAS DIVISION
DCB performances of C125 material
in various environments
API Resource Group on Sour Service Products
WI 2318a – Sour Service DCB Testing
Westminster, Colorado
June 12, 2012
Frédéric LEGAY
Cédric LINNE
Vallourec & Mannesmann Tubes
OCTG Division
1
Introduction
● Material:
 C125 material
 Yield Strength: [125ksi – 135ksi]
 Hardness: < 34HRC
 NACE A suitable for Mild Sour conditions (3% H2S, pH 3.5, 85% SMYS)
 Various sizes
 Casing with OD [7’’ – 14’’]
 + associated CS
● Environments:
 Full NACE environment: 100% H2S / sol. A / pH 2.7
 Fit For Purpose environments:
 5% NaCl – 0.4% CH3COONa
 pH (HCl adjustment): 3.5
 H2S level: 3% / 7% / 10%
Vallourec & Mannesmann Tubes
OCTG Division
2
Tests conditions
● Testing protocole:
 According testing matrix shown below
 Specimens = Chevron design
 No fatigue pre-cracking
 Temperature = 75 ± 3°F (24 ± 1.7°C)
 Duration = 14 days
Vallourec & Mannesmann Tubes
OCTG Division
3
DCB results
● Tested specimens
● KISSC (ksi.√in):
More data in full NACE environment
Higher scattering in ffp environments
Few invalid due to non propagation (most = pinning / non plannar)
Lot of dry cracks (mostly in ffp but also in full NACE)
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OCTG Division
4
DCB results – 3% H2S
d = 28 / 0,71
4
2
1
>4
6
4
-4
0
42
38
-4
6
34
-3
2
-3
8
30
26
-2
4
22
-2
0
-2
18
14
-1
6
0
<1
2
Number
3
KISSC (ksi.in1/2)
Vallourec & Mannesmann Tubes
OCTG Division
5
DCB results – 7% H2S
d = 28 / 0,71
12
10
6
4
2
>4
6
4
42
-4
0
38
-4
6
34
-3
2
-3
8
30
-2
4
26
-2
0
22
-2
18
14
-1
6
0
<1
2
Number
8
KISSC (ksi.in1/2)
Vallourec & Mannesmann Tubes
OCTG Division
6
DCB results – 10% H2S
d = 28 / 0,71
d = 20 / 0,51
6
5
3
2
1
>4
6
4
-4
0
42
38
-4
6
-3
2
34
-3
8
30
-2
4
26
22
-2
0
-2
18
14
-1
6
0
<1
2
Number
4
KISSC (ksi.in1/2)
Vallourec & Mannesmann Tubes
OCTG Division
7
DCB results – 100% H2S
d = 28 / 0,71
d = 20 / 0,51
d = 15 / 0,38
40
35
Number
30
25
20
15
10
5
>4
6
4
42
-4
0
-4
6
38
34
-3
2
-3
8
30
-2
4
26
-2
0
22
-2
6
18
-1
14
<1
2
0
KISSC (ksi.in1/2)
More used environment
Klim measured
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OCTG Division
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KISSC vs KIapplied
● Material:
 Single references
17A
13B
17A - Klim = 20,6 MPa.√m (18,7 ksi.√in)
13B - Klim = 20,0 MPa.√m (18,2 ksi.√in)
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OCTG Division
9
Conclusions
● All results in line with compliance analysis
● Fit For Purpose environments lead to scattered values
 Need to use same environment than for NACE A ?
● No need of precracking using Chevron design
● Lot of dry cracks observed (all environments)
● In Full NACE environment:
 “low” KISSC ~ 18-25 ksi.√in when using standard Q125 arm displacement
 Klim ~ 19 ksi.√in
● More data needed to determine Klim in other conditions
Vallourec & Mannesmann Tubes
OCTG Division
10
Thanks
Vallourec & Mannesmann Tubes
OCTG Division
11
Annex
● Dry cracks in ffp conditions:
 Taken into account in crack
length to be in line with
compliance analysis
Vallourec & Mannesmann Tubes
OCTG Division
● Standard crack in full NA in full
NACE conditions
12
Annex
● Material:
 KISSC vs KIapplied with all data tested under 100% H2S
Klim ~ 21,1 MPa.√m (19,2 ksi.√in)
Vallourec & Mannesmann Tubes
OCTG Division
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