Method for manufacturing high steel grade sulfur resistant drill pipe by laser cladding

A technology of laser cladding and steel grade, which is applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of sensitive drill pipe material strength, drill pipe strength that cannot meet the actual drilling needs, and brittle fracture, etc., to achieve Improve the H2S stress corrosion cracking resistance, ensure the overall performance requirements, and increase the cost
CN101722403AActive Publication Date: 2010-06-09BC P INC CHINA NAT PETROLEUM CORP +1
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2010-06-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a method for manufacturing a high steel grade sulfur-resistant drill pipe by laser cladding. In the method, in the condition of inert gas insulating air, nickel-base alloy anti-corrosion material is clad on the inner and outer pipe walls of an S135 steel grade drill pipe with conventional properties by laser, a nickel-base alloy anti-corrosion layer is clad on the non-thread area of a joint, threads are processed on the thread conical surface of the joint after a nickel-base alloy anti-corrosion layer is clad on the thread conical surface of the joint, and the end part of a pipe body is oppositely connected with the joint through friction welding; the output power of the laser is 3.5-4.5kW; laser beam spot size is not more than Phi 3mm; defocusing amount is 25-35mm; laser beam scanning line speed is 6.5-7.5mm / s; the inclined angle between the laser beam and the long axis direction of the pipe body is 40-50 degree; and the delivery rate of cladding wire material is 15-20g / s. The drilling pipe reaches the property of the S135 steel grade drilling pipe by the APE Spec standard. The cladding layer can effectively prevent a base body from contacting natural gas to improve the H2S-resistant stress corrosion cracking performance.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for preparing a high steel grade sulfur-resistant drill pipe by laser cladding for drilling a drill string component in a highly acidic hydrogen sulfide-containing gas field with laser surface treatment. Background technique

[0002] Drill pipe is an essential tool in oil drilling engineering. The technical issue that needs to be considered for conventional drill pipes is to meet the general drilling conditions, mainly mechanical properties. Western gas fields such as the Sichuan-Chongqing gas field are the main areas in the development of domestic oil and gas resources, but the gas fields in this area have a rather high H 2 S content, in addition to the uniform corrosion that can be detected and monitored, also has some failure forms such as stress corrosion cracking that originate from internal damage of the material, which is at great risk. Therefore, sulfur-resistant drill pipe must be used to ensure the safety o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More