引用本文:孙海礁,郭玉洁,张志宏,陈长风,王涛. 天然气外输管道黑粉分布规律及清除措施[J]. 石油与天然气化工, 2018, 47(6): 98-103.
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天然气外输管道黑粉分布规律及清除措施
孙海礁1,郭玉洁1,张志宏1,陈长风2,王涛2
1.中石化西北油田分公司石油工程技术研究院;2.中国石油大学(北京)理学院
摘要:
黑粉在天然气外输管道中积聚,会造成仪表阀门堵塞、输送介质污染、管输量下降等一系列问题,因此,有必要开展管道中黑粉组成和分布情况研究。结合外输管线的清管作业情况,分析了管道不同部位的黑粉组成、分布和形态。同时,对管输天然气历年气质情况进行了分析,确定了黑粉组成及其在管线中的分布规律,分析了黑粉形成原因。结果表明:黑粉偏向在距气源较近、地势低洼处的管道中聚集;其主要组成为FeCO3,还含有一定量的Fe3S4、FeS、S、SiO2、Fe2O3等,其中FeCO3、Fe3S4、FeS主要由天然气生产设备或管道发生CO2和H2S腐蚀所形成,而S、SiO2、Fe2O3则由上游气源携入或来自管线施工残留物。根据黑粉的组成和其在管道中的分布特点,提出了黑粉防治措施建议:从源头上杜绝设备和管道的腐蚀;对老旧天然气外输管线应定期组织清管,清管时选用合适的清管工艺。
关键词:  天然气  外输管道  黑粉  腐蚀  防治  清管
DOI:10.3969/j.issn.1007-3426.2018.06.019
分类号:
基金项目:
Distribution and remove measures of black powder in natural gas pipeline
Sun Haijiao1, Guo Yujie1, Zhang Zhihong1, Chen Changfeng2, Wang Tao2
1. Northwest Oil Field Branch Company Petroleum Engineering Technology Research Institute, Urumqi, Xinjiang, China;2. College of Science of China University of Petroleum, Beijing, China
Abstract:
The accumulation of black powder in transportation pipeline would induce a series of problems, such as blockage of the instrument and valves, pollution of the conveying gas and loss of pipe transporting volume. Therefore, it is necessary to study the composition and distribution of black powder in transportation pipeline. Based on the operation of pigging, the composition, distribution and form of the black powder at different locations in natural gas transportation pipelines were investigated. Correspondently, gas quality of the pipelines in recent years were analyzed as well, leading to the understanding on the composition, distribution, and the possible causes of the black powder in the pipelines. The results showed that black powder prefers to accumulate at the low-lying places closing to gas source. The black power is mainly composed of FeCO3, and mounts of Fe3S4, S, SiO2 and Fe2O3. Among which, FeCO3, Fe3S4, and FeS were mainly formed by CO2 and H2S corrosion of pipeline steel, while S, SiO2, Fe2O3 were carried by the upstream gas flow or from the construction residues. The prevention and control measures of black powder were proposed according to the composition and distribution features of black powder in transportation pipeline, including preventing the corrosion of equipment and pipes from the source, cleaning the old natural gas pipeline regularly, and selecting suitable procedures for pigging operation.
Key words:  natural gas  transportation pipeline  black powder  corrosion  prevention and control  pigging