Title:
【発明の名称】水素脆化条件下で使用される剪断ラム
Document Type and Number:
Japanese Patent JPS5832274
Kind Code:
B2
Abstract:
Shear rams shearing drill pipe passing through with blowout preventers encountering hydrogen sulfide are disclosed. The ram bodies are formed of an alloy having an upper hardness level of about Rc22 and the shearing blade and drill string engaging surfaces of the rams are hardfaced with a layer of nickel-based alloys, cobalt-based alloys, and tungsten-based alloys hard enough to shear the drill pipe. The layer of alloy is thin enough to avoid peeling off in use and warping the ram bodies when being welded to them. A number of embodiments and examples of the invention is disclosed.
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Inventors:
TOOMASU ETSUKUSU TEII GYUUEN
Application Number:
JP10020877A
Publication Date:
July 12, 1983
Filing Date:
August 23, 1977
Export Citation:
Assignee:
RUCKER CO
International Classes:
E21B29/08; E21B33/06; (IPC1-7): E21B33/06
Attorney, Agent or Firm:
Matsuhiro Masahiro