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CN-122007810-A - Runner surfacing process and wellhead device

CN122007810ACN 122007810 ACN122007810 ACN 122007810ACN-122007810-A

Abstract

The application provides a runner surfacing process and a wellhead device, wherein the runner surfacing process comprises the steps of detecting an inner wall parameter of a runner, setting a parameter threshold according to the ratio of the length to the aperture of the runner, processing the inner wall parameter and the parameter threshold, processing the inner wall of the runner when the inner wall parameter is larger than the parameter threshold, simultaneously processing one end of the runner to form a reaming to enable the runner to be in a stepped hole structure, assembling, inserting a metal rod into the processed runner, surfacing, forming a molten pool on a reaming melting welding rod, covering the inner wall surface of the reaming with the molten pool, welding the metal rod with the inner wall surface of the runner through the surfacing layer, detecting the flaw of the surfacing layer, and processing the hole structure on the metal rod. The runner surfacing process and the wellhead device provided by the application can solve the problems of complex process and high operation difficulty in the corrosion prevention process of the runner in the prior art.

Inventors

  • ZHANG LICHENG
  • WANG XIAOCHEN
  • WANG ZETAO
  • ZHANG GUICHANG
  • XUE QINGHUA
  • SHEN HONGDA
  • LI XINYU
  • XIAO ANLEI

Assignees

  • 德州联合石油科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. A runner surfacing process, comprising: detecting, namely acquiring the inner wall parameters of the flow channel (10), and setting a parameter threshold according to the ratio of the length and the aperture of the flow channel (10); Processing, namely comparing the parameter of the inner wall with the parameter threshold, and processing the inner wall of the flow channel (10) when the parameter of the inner wall is larger than the parameter threshold, and simultaneously processing one end of the flow channel (10) to form a reaming (120) so as to form the flow channel (10) into a step hole-shaped structure; Assembling, namely inserting a metal rod (20) into the processed runner (10); A weld pool is formed by melting welding rods on the reaming (120), the weld pool covers the weld overlay (30) on the inner wall surface of the reaming (120), and the metal rod (20) is welded with the inner wall surface of the runner (10) through the weld overlay (30); Flaw detection is performed on the build-up layer (30), and a hole structure (210) is machined on the metal rod (20).
  2. 2. The runner overlay welding process according to claim 1, wherein the obtaining of the parameters of the inner wall of the runner (10) comprises: scanning the inner wall of the flow channel (10) by using a three-coordinate measuring machine to obtain the shape tolerance of the inner wall of the flow channel (10), wherein the shape tolerance comprises roundness and straightness; and detecting the inner wall of the flow channel (10) by using a roughness detector to obtain the roughness of the inner wall of the flow channel (10).
  3. 3. The process of claim 1, wherein the process comprises, The ratio of the length of the flow channel (10) and the aperture of the flow channel (10) is inversely proportional to the parameter threshold.
  4. 4. A runner overlay welding process according to claim 3, wherein said setting a parameter threshold according to the ratio of the length and the aperture of the runner (10) comprises: Setting a threshold value of roughness of the inner wall of the flow channel (10) to be less than or equal to 0.6 mu m; The shape tolerance of the inner wall of the runner (10) comprises roundness and straightness, the threshold value of the roundness is not more than +/-0.01 mm, and the threshold value of the straightness is not more than +/-0.05 mm.
  5. 5. The process of claim 1, wherein the process comprises, The flow channel (10) is provided with a body hole (110) and a reaming (120) which are axially communicated, the pore diameter of the reaming (120) is larger than that of the body hole (110), the body hole (110) is coaxial with the reaming (120), and/or The bore diameter of the counterbore (120) is greater than the diameter of the metal rod (20).
  6. 6. The runner overlay welding process as recited in claim 1, wherein machining a counterbore (120) at one end of the runner (10) comprises: machining the reaming (120) by adopting a milling process on one end of the flow channel (10) with the axis of the flow channel (10) as a reference; finishing the inner wall surface of the reaming (120) by adopting a ball end mill; and carrying out surface treatment on the inner wall surface of the reaming (120) by using a polishing machine so that the roughness of the inner wall surface of the reaming (120) is smaller than a roughness threshold.
  7. 7. The hardfacing process of claim 1, further comprising retesting after the machining step, the retesting comprising: carrying out retest on parameters of the inner wall of the runner (10) after polishing the inner wall of the runner (10) for the first time; returning to the processing step to process the inner wall of the flow channel (10) when the inner wall parameter is greater than the parameter threshold; and when the parameter of the inner wall is smaller than the parameter threshold, detecting the flaw of the runner (10), and executing assembly of the metal rod (20) after confirming that the flaw is correct.
  8. 8. The flow channel surfacing process according to any one of claims 1 to 7, wherein the assembling comprises: Cleaning the surface of the metal rod (20); The inner wall surface of the runner (10) is cleaned, and the metal rod (20) with the cleaned surface is inserted into the runner (10) with the cleaned inner wall surface.
  9. 9. The runner weld overlay process according to any one of claims 1 to 7, wherein said melting the electrode at said counterbore (120) to form a puddle comprises: Preparing a welding rod and a welding gun, wherein the diameter of the welding rod is 1.2mm; and in the welding process, the welding rod is melted by controlling the angle of a welding gun to be 15-25 degrees and the welding heat input to be 10-15kJ/cm by adopting an argon arc welding process, and the melted welding rod forms a molten pool and permeates from one end of an axial opening of the reaming (120) to the end face of the other end of the reaming (120) to form the surfacing layer (30).
  10. 10. A wellhead characterized in that it has a runner (10) using the runner surfacing process according to any one of claims 1 to 9.

Description

Runner surfacing process and wellhead device Technical Field The invention relates to the technical field of petroleum, in particular to a runner surfacing process and a wellhead device. Background In the field of industrial production, particularly petroleum equipment manufacturing, in order to enhance the corrosion resistance of wellhead devices, particularly in the industrial manufacturing of small-aperture long-runner complex structures, a manner of forming a surface corrosion-resistant layer on the inner wall surface of a runner is widely adopted in the industry to enhance the corrosion resistance of the wellhead devices. However, this surface treatment technique faces a number of technical and operational challenges when applied to small bore long flow channels. In particular, the length and pore size of the flow channels present a significant challenge to the application of the corrosion protection layer. In an elongated space, it becomes extremely difficult to achieve accurate and uniform application of the corrosion protection layer. Limitations in the depth and aperture of the flow channels make it difficult to achieve optimal operation of conventional spray equipment, resulting in uneven thickness of the corrosion protection layer, where some areas may be too thick and others too thin. Such non-uniformity not only reduces the effectiveness of the corrosion protection layer, but may also cause cracking or spalling of the coating due to localized excessive thickness, thereby affecting the overall flow path function and lifetime. In addition, the complex structure of the flow channels increases the difficulty of the operation process, and the operator needs to carefully operate to avoid excessive coating build-up or flow channel blockage. The operation process is very complex, requires operators to have high skill and experience, can cause the defect of the anticorrosive coating on the inner wall of the runner by a little carelessness, even causes equipment failure or damage, increases production cost and delay risk, and also forms potential threat to operation safety. From the above, the corrosion prevention process of the runner in the prior art has the problems of complex process and high operation difficulty. Disclosure of Invention The invention mainly aims to provide a runner surfacing process and a wellhead device, so as to solve the problems of complex process and high operation difficulty in the corrosion prevention process of a runner in the prior art. In order to achieve the above object, according to one aspect of the present invention, there is provided a runner overlay process including: detecting, namely acquiring the parameters of the inner wall of the flow channel, and setting a parameter threshold according to the ratio of the length to the aperture of the flow channel; Processing, namely comparing the parameter of the inner wall with a parameter threshold value, and processing the inner wall of the flow channel when the parameter of the inner wall is larger than the parameter threshold value; Assembling, namely inserting a metal rod into the processed runner; Build-up welding, forming a molten pool on the reaming melting welding rod, wherein the molten pool covers the build-up welding layer on the inner wall surface of the reaming, and the metal rod is welded with the inner wall surface of the runner through the build-up welding layer; and performing flaw detection on the build-up welding layer, and processing a hole structure on the metal rod. Further, acquiring the parameters of the inner wall of the flow channel includes: scanning the inner wall of the flow channel by using a three-coordinate measuring machine to obtain the shape tolerance of the inner wall of the flow channel, wherein the shape tolerance comprises roundness and straightness; and detecting the inner wall of the flow channel by using a roughness detector to obtain the roughness of the inner wall of the flow channel. Further, the ratio of the length of the flow channel and the aperture of the flow channel is set inversely proportional to the parameter threshold. Further, setting the parameter threshold according to the ratio of the length and the aperture of the flow channel includes: setting the threshold value of the roughness of the inner wall of the runner to meet Ra less than or equal to 0.6 mu m; The shape tolerance of the inner wall of the flow channel includes roundness and straightness, setting the threshold value of roundness less than or equal to +/-0.01 mm and setting the threshold value of straightness less than or equal to +/-0.05 mm. Further, the runner is provided with a body hole and a reaming hole which are axially communicated, the pore diameter of the reaming hole is larger than that of the body hole, the body hole and the reaming hole are coaxial, and/or the pore diameter of the reaming hole is larger than that of the metal rod. Further, machining the counterbore at the one end of the flow pa