Tube material for sour wells of intermediate depths

• US 4,358,511 A
• Filed: 10/31/1980
• Issued: 11/09/1982
• Est. Priority Date: 10/31/1980
• Status: Expired due to Term

• Current Assignee: Inco Alloys International, Inc. (Berkshire Hathaway Incorporated)
• Original Assignee: Huntington Alloys Corporation (Berkshire Hathaway Incorporated)
• Inventors: Smith, Darrell F. Jr., Clatworthy, Edward F.
• Primary Examiner(s): Lewis, Michael L.
• Application Number:
  US06/202,742
• Time in Patent Office: 739 Days
• Field of Search: 75/122, 75/134 F, 75/134 C, 148/31, 148/32, 138/177, 428/595
• US Class Current: 428/595
• CPC Class Codes: C22C 19/055 with the maximum Cr content being at least 20% but less than 30%
• CPC Class Codes: E21B 17/00 Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
• CPC Class Codes: Y10T 428/12292 Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]
• CPC Class Codes: Y10T 428/12354 Nonplanar, uniform-thickness material having symmetrical channel shape or reverse fold [e.g., making acute angle, etc.]

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.

Claims

1. 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.

2. A new article of manufacture in accordance with claim 1, wherein said alloy is age hardened to 130,000 psi and has an elongation of about 20%.

3. 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.

4. An alloy in accordance with claim 3 wherein the titanium content is about 1.5% to about 25%.

5. An alloy in accordance with claim 4 wherein the columbium content is about 1.5% to about 3%.