Alloy for making high strength deep well casing and tubing having improved resistance to stress-corrosion cracking
US4400211A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1982 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jun 1, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alloy useful for manufacturing high strength deep 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.sub.2 S-CO.sub.2 -Cl.sup.- environment, which comprises the following alloy composition: ______________________________________ C: .ltoreq.0.1% Si: .ltoreq.1.0% Mn: .ltoreq.2.0% P: .ltoreq.0.030% S: .ltoreq.0.005% N: 0-0.30% Ni: 30-60% Cr: 15-35% Mo: 0-12% W: 0-24% Cr(%) + 10Mo(%) + 5W(%) .gtoreq. 110% 7.5% .ltoreq. Mo(%) + 1/2W(%) .ltoreq. 12% Cu: 0-2.0% Co: 0-2.0% rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% one or more of Nb, Ti, Ta, Zr and V in the total amount of 0.5-4.0%, if necessary Fe and incidental impurities: balance. ______________________________________
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.