Hydrogen-induced-cracking resistant and sulphide-stress-cracking resistant steel alloy

a technology of sulphide stress and steel alloy, which is applied in the field of sulphide stress and sulphide stress steel alloy, can solve the problems of tensile load, deterioration of casing, and sourness of older wells over their production lifetim

Inactive Publication Date: 2003-06-26
OHARA RANDY D +4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many new wells contain significant fractions of H.sub.2S while older wells become increasingly sour over their production lifetime.
However, the casing is unable to expand due to the physical constraints placed on the casing by the environment.
At the conclusion of the stimulation cycle, the well cools and the resultant thermal contraction of the material results in a tensile load.
This cycling will be repeated several times through the life of t

Method used

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  • Hydrogen-induced-cracking resistant and sulphide-stress-cracking resistant steel alloy
  • Hydrogen-induced-cracking resistant and sulphide-stress-cracking resistant steel alloy
  • Hydrogen-induced-cracking resistant and sulphide-stress-cracking resistant steel alloy

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Embodiment Construction

[0022] Conventional steel-making techniques known in the industry including clean scrap melting practices may be used to make an alloy falling within the scope of the invention once the chemistry is known. The product of clean scrap melting frequently contains low concentration of benign alloying elements, trace amounts of miscellaneous elements, some of which may have deleterious effects, and minor alloying elements.

[0023] It was well known prior to the present invention that other benign alloying elements might be added to alloys of the present general type without interfering with the metallurgical objectives of the present invention. Examples of such benign alloying elements are nickel, copper, aluminum and silicon. By controlling the concentration of these alloying elements, one can realize a benefit in the alloy. Accordingly, these may be referred to as minor alloying elements or benign alloying elements depending upon he concentration. For example, copper may be found in conc...

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Abstract

A steel alloy, for use in casing for oil and gas wells in low pH environments. The steel alloy has a carbon range by weight of 0.15% to 0.35%, a manganese range by weight of 0.60% to 1.10%, a molybdenum range by weight of 0.15% to 0.65%, a calcium range by weight of 0.0045% and a sulfur range by weight of less than 0.002%. The steel alloy also has, by weight, a chromium range of less than 0.50%, and an aluminum range of 0.010% to 0.080%.

Description

[0001] The present application is a continuation application of U.S. application Ser. No. 09 / 036,545, which is a continuation application of application Ser. No. 09 / 036,545 filed on Mar. 6, 1998. The '545 application is a continuation-in-part application of U.S. application Ser. No. 08 / 813,374 filed on Mar. 7, 1997. The present application incorporates by reference the entire contents of all of these parent applications.[0002] This invention relates in general to a steel alloy and more particularly to a steel alloy that resists hydrogen-induced cracking and sulfide stress cracking. This alloy is particularly suitable for use in casing for use with sour oil and gas wells. The invention also comprises casing made from such alloy.BACKGROUND TO THE INVENTION[0003] In a number of different industries including the oil and gas industry, there is a need for steel alloys that can resist severe mechanical stresses, hydrogen-induced cracking (HIC), and sulfide stress cracking (SSC).[0004] Oil...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/02C22C38/12
CPCC22C38/002C22C38/12C22C38/02
Inventor O'HARA, RANDY D.KRUGER, RICHARD B.KOSTIC, M. MILOSASANTE, JAMES C.COLLINS, LAURIE E.
Owner OHARA RANDY D
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