·失效分析与预防·

苏里格气田湿气输送管道内腐蚀评价方法初探

朱方辉1,2付彩利1,2程碧海1,2刘伟1,2孙雨来1,2

(1.低渗透油气田勘探开发国家工程实验室陕西西安710018；

2.中国石油长庆油田分公司油气工艺研究院陕西西安710018)

摘要：苏里格气田井间串接集输模式下，多数管道为湿气输送，管内积液量变化大且成份复杂。以某Φ406.4 mm×7.1 mm，长31.7 km输气干线为例，通过清管液、固形物分析，实物腐蚀测试及腐蚀软件预测评价了平均内腐蚀程度。借鉴ICDA方法，通过临界倾角计算对比查找出36处易积液段腐蚀风险点以支持开展后续监测评价。结合该两项工作基本掌握此管道内腐蚀状况，且该方法可对苏里格气田此类管道的内腐蚀评价提供一定参考。

关键词：气田；管道；湿气输送；内腐蚀；评价方法

作者简介：第一朱方辉，男，1982年生，工程师，毕业于西北工业大学材料加工工程专业取得硕士学位，现工作于长庆油田公司油气工艺研究院，主要从事油气田防腐及材料评价等方面工作。E-mail：zfh_cq@petrochina.com.cn

文章编号：中图法分类号：U177;TE832

收稿日期：(2015-05-05编辑：屈忆欣)

Study of Internal Corrosion Assessment Approach for Wet-Gas Transmission Pipelines in Sulige GasfieldZHU FangHui1,2FU CaiLi1,2CHENG BiHai1,2LIU Wei1,2SUN Yulai1,2

(1.NationalEngineeringLaboratoryforExplorationandDevelopmentofLowPermeabilityOilandGasFields,Xi’an,Shaanxi710018,China;

2.Oil&GasTechnologyResearchInstitute,ChangqingOilfieldCompany,Xi’an,Shaanxi710018,China)

Abstract：Lots of wet-gas transmission pipelines in Sulige gas-field has a plenty variety of liquid loading quantity with complex composition, because of the gathering pattern is pipe network concatenate. A case study of the oldest wet-gas transmission pipeline which the specification is Φ406.4mm×7.1mm×31.7km.The average corrosion level were evaluated through the pigging products analyzed, coupon corrosion tests and software corrosion prediction; 36 corrosion risk points were located by calculated critical inclination angles based on the experience of the ICDA method, and this conclusion can support follow-up inspection and evaluation. Above-mentioned two study can knew well the internal corrosion status of this pipelines and provide a internal corrosion assessment approach for this type of pipelines in Sulige gas field.

Key word： gas field,pipelines,wet-gas transmission,internal corrosion, assessment approach

0引言

长庆苏里格气田集气支干线均采用多井单管串接，带液计量，集中处理的集输模式。集输管道一直处于“湿气输送”模式，输送压力1.3 MPa～3.5 MPa，管输介质复杂，包含天然气、产出水、凝析油、泡排剂等。对该气田21条集气干线的历年清管作业发现，管内积液量大，且变化不规律。前期管网系统开展了大量外防腐和阴极保护运行评价，但未开展过系统内腐蚀评价研究。……