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US4400349A
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Alloy for making high strength deep well casing and tubing having improved resistance to stress-corrosion cracking
Assignee: Nippon Steel Corp
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Filing: 1982-06-17
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Granted: 1983-08-23
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Expires: 2002-06-17
Abstract
Abstract An alloy useful for manufacturing high strength oil-well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H 2 S--CO 2 --Cl - environment, which comprises the following alloy composition: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: 3-20% P: ≦ 0.030% S: ≦ 0.005% N: 0-0.30% sol. Al ≦ 0.5% Ni: 20-60% Cr: 15-35% Mo: 0-12% W: 0-24% Cr(%) + 10 Mo(%) + 5 W(%) ≧ 50% 1/2 Mn(%) + Ni(%) ≧ 25% 1.5% ≦ Mo(%) + 1/2 W(%) ≦ 12% Cu: 0-2.0% Co: 0-2.0% Rare Earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ti: 0-0.5% Ca: 0-0.10% Fe and incidental impurities: balance. ______________________________________
Inventors
- 👤 Takeo Kudo
- 👤 Yasutaka Okada
- 👤 Taishi Moroishi
- 👤 Akio Ikeda
- 👤 Hiroo Ohtani
- 👤 Kunihiko Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:18
CPC Classifications
E; E21; E21B; E21B17/00; C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/053; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
114 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 150° C. or less under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦ 0.1% Si: ≦ 1.0%
Mn: 3-20% P: ≦ 0.030%
S: ≦ 0.005%
N: 0-0.30%
sol. Al ≦ 0.5%
Ni: 25-60%
Cr: 22.5-35% Mo: 0-4% (excl.)
W: 0-8% (excl.)
Cr(%) + 10 Mo(%) + 5 W(%) ≧ 50%
1/2 Mn(%) + Ni(%) ≧ 35%
1.5% ≦ Mo(%) + 1/2 W(%) < 4%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 2
Dependent Claim
114 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 150° C. or less under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦ 0.1% Si: ≦ 1.0%
Mn: 3-20% P: ≦ 0.030%
S: ≦ 0.005%
N: 0-0.30%
sol. Al ≦ 0.5%
Ni: 25-60%
Cr: 22.5-35% Mo: 0-4% (excl.)
W: 0-8% (excl.)
Cr(%) + 10 Mo(%) + 5 W(%) ≧ 50%
1/2 Mn(%) + Ni(%) ≧ 35%
1.5% ≦ Mo(%) + 1/2 W(%) < 4%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 3
Dependent Claim
26 words
An alloy as defined in claim 1, in which the carbon content is not more than 0.05% and the manganese content is from 3% to 15%.
Claim 4
Dependent Claim
26 words
An alloy as defined in claim 1, in which the nickel content is from 35% to 60% and the chromium content is from 24% to 35%.
Claim 5
Dependent Claim
17 words
An alloy as defined in claim 1, in which the sulfur content is not more than 0.0007%.
Claim 6
Dependent Claim
17 words
An alloy as defined in claim 1, in which the phosphorous content is not more than 0.003%.
Claim 7
Dependent Claim
20 words
An alloy as defined in any one of claims 1-5, in which the nitrogen content is from 0.05% to 0.25%.
Claim 8
Dependent Claim
112 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 200° C. or less under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦0.1% Si: ≦1.0%
Mn: 3-20% P: ≦0.030%
S: ≦0.005%
N: 0-0.30%
sol.Al ≦ 0.5%
Ni: 20-60%
Cr: 22.5-30% Mo: 0-8% (excl.)
W: 0-16% (excl.)
Cr (%) + 10Mo (%) + 5W (%) ≧ 70%
1/2Mn (%) + Ni (%) ≧ 25%
4% ≦ Mo (%) + 1/2W (%) < 8%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 9
Dependent Claim
112 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 200° C. or less under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦0.1% Si: ≦1.0%
Mn: 3-20% P: ≦0.030%
S: ≦0.005%
N: 0-0.30%
sol.Al ≦ 0.5%
Ni: 20-60%
Cr: 22.5-30% Mo: 0-8% (excl.)
W: 0-16% (excl.)
Cr (%) + 10Mo (%) + 5W (%) ≧ 70%
1/2Mn (%) + Ni (%) ≧ 25%
4% ≦ Mo (%) + 1/2W (%) < 8%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 10
Dependent Claim
26 words
An alloy as defined in claim 7, in which the carbon content is not more than 0.05% and the manganese content is from 3% to 15%.
Claim 11
Dependent Claim
26 words
An alloy as defined in claim 7, in which the nickel content is from 35% to 60% and the chromium content is from 24% to 30%.
Claim 12
Dependent Claim
17 words
An alloy as defined in claim 7, in which the sulfur content is not more than 0.0007%.
Claim 13
Dependent Claim
17 words
An alloy as defined in claim 7, in which the phosphorous content is not more than 0.003%.
Claim 14
Dependent Claim
20 words
An alloy as defined in any one of claims 7-11, in which the nitrogen content is from 0.05% to 0.25%.
Claim 15
Dependent Claim
110 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 200° C. or more under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦0.1% Si: ≦1.0%
Mn: 3-20% P: ≦0.030%
S: ≦0.005%
N: 0-0.30%
sol.Al ≦0.5% Ni: 20-60%
Cr: 15-30% Mo: 0-12%
W: 0-24%
Cr (%) + 10Mo (%) + 5 W (%) ≧ 110%
1/2Mn (%) + Ni (%) ≧ 30%
8% ≦ Mo (%) + 1/2W (%) ≦ 12%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 16
Dependent Claim
110 words
An alloy for making high strength deep well casing and tubing having improved resistance to stress corrosion cracking at temperatures of 200° C. or more under H 2 S-CO 2 -Cl - conditions, the alloy composition consisting essentially of: ______________________________________
C: ≦0.1% Si: ≦1.0%
Mn: 3-20% P: ≦0.030%
S: ≦0.005%
N: 0-0.30%
sol.Al ≦0.5% Ni: 20-60%
Cr: 15-30% Mo: 0-12%
W: 0-24%
Cr (%) + 10Mo (%) + 5 W (%) ≧ 110%
1/2Mn (%) + Ni (%) ≧ 30%
8% ≦ Mo (%) + 1/2W (%) ≦ 12%
Cu: 0-2.0% Co: 0-2.0%
Rare Earths: 0-0.10%
Y: 0-0.20%
Mg: 0-0.10% Ti: 0-0.5%
Ca: 0-0.10%
Fe and incidental impurities: balance.
______________________________________
Claim 17
Dependent Claim
26 words
An alloy as defined in claim 13, in which the carbon content is not more than 0.05% and the manganese content is from 3% to 15%.
Claim 18
Dependent Claim
17 words
An alloy as defined in claim 13, in which the nickel content is from 40% to 60%.
Claim 19
Dependent Claim
17 words
An alloy as defined in claim 13, in which the sulfur content is not more than 0.0007%.
Claim 20
Dependent Claim
17 words
An alloy as defined in claim 13, in which the phosphorous content is not more than 0.003%.
Claim 21
Dependent Claim
20 words
An alloy as defined in any one of claims 13-17, in which the nitrogen content is from 0.05% to 0.25%.
Claim 22
Dependent Claim
12 words
Deep well casing or tubing made of the alloy of claim 1.
Claim 23
Dependent Claim
12 words
Deep well casing or tubing made of the alloy of claim 7.
Claim 24
Dependent Claim
12 words
Deep well casing or tubing made of the alloy of claim 13.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |