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The reservoirs in southwest China are characterized by ultra-deep (9026 m), high pressure (155 MPa), high temperature (216 ℃), and strong corrosion environments (maximum sulfur content exceeds 200 g/m3), posing significant challenges to economic completion technologies. Tungsten alloy coating technology for tubing has been studied as an economical completion method. This article evaluates the sulfide stress corrosion cracking (SSC) resistance of tungsten alloy coated tubing according to the NACE TM0177-2016 standard. It utilizes a high-temperature and high-pressure corrosion testing device to conduct corrosion evaluation experiments on five typical gas reservoirs in southwest oil and gas fields. Additionally, a cost comparison analysis is conducted for different anticorrosion schemes in conventional gas and shale gas wells, aiming to analyze the economic adaptability of tungsten alloy tubing in deep shale gas wells and conventional sulfur-bearing gas wells. The results of the SSC resistance test on tungsten alloy coated tubing show that no fracture occurred within 720 h. After observing the working section under 10 × magnification, no cracks were found. The corrosion resistance evaluation of tungsten alloy coated tubing in five typical gas reservoirs in southwest oil and gas fields indicates an average corrosion rate ranging from 0.0012 to 0.0227 mm/a, satisfying the mild corrosion category specified in NACE RP 0775, demonstrating excellent corrosion resistance. In terms of cost investment, tungsten alloy coated tubing can save more than 70% of the tubing cost compared to nickel-based alloy tubing in conventional gas wells. In shale gas wells, the comprehensive cost of the three anti corrosion processes (tungsten alloy coating, internal coating, and biocide injection) is roughly equivalent over a six-year period. The applicability analysis of tungsten alloy coated tubing shows good technical and economic benefits, while also verifying the feasibility of tungsten alloy coated tubing in sulfur-bearing gas wells, providing a new method for economical completion in southwest China.

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Applicability Analysis of Tungsten Alloy Coated Tubing in Southwest China

  • 会议论文

  • 发表日期：

    2025年

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  • Da-jiang Zhu,
  • Nai-yan Zhang,
  • Yu-fei Li,
  • Geng Tang,
  • Lin-feng Lu,
  • Hao Gong

摘要

The reservoirs in southwest China are characterized by ultra-deep (9026 m), high pressure (155 MPa), high temperature (216 ℃), and strong corrosion environments (maximum sulfur content exceeds 200 g/m3), posing significant challenges to economic completion technologies. Tungsten alloy coating technology for tubing has been studied as an economical completion method. This article evaluates the sulfide stress corrosion cracking (SSC) resistance of tungsten alloy coated tubing according to the NACE TM0177-2016 standard. It utilizes a high-temperature and high-pressure corrosion testing device to conduct corrosion evaluation experiments on five typical gas reservoirs in southwest oil and gas fields. Additionally, a cost comparison analysis is conducted for different anticorrosion schemes in conventional gas and shale gas wells, aiming to analyze the economic adaptability of tungsten alloy tubing in deep shale gas wells and conventional sulfur-bearing gas wells. The results of the SSC resistance test on tungsten alloy coated tubing show that no fracture occurred within 720 h. After observing the working section under 10 × magnification, no cracks were found. The corrosion resistance evaluation of tungsten alloy coated tubing in five typical gas reservoirs in southwest oil and gas fields indicates an average corrosion rate ranging from 0.0012 to 0.0227 mm/a, satisfying the mild corrosion category specified in NACE RP 0775, demonstrating excellent corrosion resistance. In terms of cost investment, tungsten alloy coated tubing can save more than 70% of the tubing cost compared to nickel-based alloy tubing in conventional gas wells. In shale gas wells, the comprehensive cost of the three anti corrosion processes (tungsten alloy coating, internal coating, and biocide injection) is roughly equivalent over a six-year period. The applicability analysis of tungsten alloy coated tubing shows good technical and economic benefits, while also verifying the feasibility of tungsten alloy coated tubing in sulfur-bearing gas wells, providing a new method for economical completion in southwest China.