雅克拉-大涝坝凝析气田井下油管腐蚀分析

摘要

Yakela-Dalaoba gas condensate field locates in Xinjiang Tarim Basin. The reservoir property belongs to high depth （5000--6000 m）, high pressure （56--58 MPa）, high temperature （146--150℃） and complex corrosion environment （high CO2, high Cl-, low pH , low H2S ）. After the field was put into operation for 5 years, due to the occurrence of corrosion of underground pipes 15,500 meters tubing were scrapped. After analyzing the Yakela- Dalaoba corrosive environment and the failure in hole tubing, the gas well downhole tubing corrosion protection measures and recommendations are proposed.%雅克拉-大涝坝凝析气田投产5年时间内，因腐蚀报废油管15500m。通过对气井腐蚀环境、井下油管腐蚀状况和失效状况进行分析，根据结论提出采用有利于腐蚀防护的先进完井工艺，采用升级管材和特殊扣型的扣内涂层管，探索改性金属油管的使用和采用阴极保护等腐蚀防护措施和建议。