Tube material for sour wells of intermediate depths
AssigneeHuntington Alloys, Inc.
InventorsDarrell F. Smith, Jr., Edward F. Clatworthy
Life of this patent
Estimating the term…
Abstract
Directed to a nickel-chromium-molybdenum alloy containing about 1.3% to about 3% of aluminum plus titanium, which is particularly useful where corrosion resistance, strength and ductility are required, such as in oil well tubing.
Claims5
As a new article of manufacture, an oil well tube having a yield strength at room temperature of at least about 110,000 psi, an elongation of at least 10%, together with resistance to environments containing hydrogen sulfide, chloride and water, as well as gaseous and/or liquid hydrocarbons made of an age hardened alloy consisting essentially of about 38% to 46% nickel, about 19.5% to 23.5% chromium, about 2.5% to about 3.5% molybdenum, about 1.5% to 3% copper, about 1% to about 2.5% titanium, about 0.1% to about 0.6% aluminum, the contents of aluminum and titanium being at least 1.3% and up to 3%, up to about 3.5% columbium, not more than 0.15% carbon and the balance essentially iron.
A wrought alloy consisting essentially of about 38% to about 46% nickel, about 19.5% to about 23.5% chromium, about 2.5% to about 3.5% molybdenum, about 1.5% to about 3% copper, up to about 3.5% columbium, about 1% to about 2.5% titanium, about 0.05% to about 0.6% aluminum, the contents of aluminum and titanium being at least about 1.3%, when columbium content is less than about 1.5%, but not exceeding about 3% not more than about 0.1% carbon and the balance essentially iron.
Dependencies are inferred from the claim text.