摘要
以延长气田延气2井区BZ 1-BZ 4集气管线为例,采用多相流工艺计算标准化软件OLGA提供的腐蚀模块,重点分析BZ 1-BZ 4集气管线当前输送条件、气质、水质条件下,集气管线高腐蚀风险值的大小、出现的位置以及形成原因,并对不同腐蚀位置的风险值,依大小进行排序,评价湿气管线运行的完整性。BZ 1-BZ 4集气管线高腐蚀风险点大多出现在起伏管线的上坡段,且在上坡段中部较长时间维持高风险值;BZ 1-BZ 4集气管线高腐蚀风险点出现的位置均与高持液率、段塞流动状态、高壁面剪切力等气液两相流动参数出现的频率、位置相吻合,即在管线操作参数确定的条件下,管内气液流动状态严重影响管线高腐蚀风险点位置和风险大小。管线内腐蚀直接评价方法可以实现延气2井区管线内腐蚀直接检测,进而替代湿气管道智能清管内检测技术。
BZ 1-BZ 4 gas gathering line in No.2 Yanqi well area of Yanchang gas field is set as an example and corrosion module provided by OLGA software is used to analyze the risk level, occurrence position and formation reasons of high corrosion under current transportation conditions, gas & water quality. And risk values of different corrosion locations are ranked according to the size of the pipeline, and the integrity of the operation of the gas pipeline is evaluated. The high corrosion risk points of the BZ 1-BZ 4 gas gathering line are mostly at the upslope section of the fluctuating lines, maintaining high risk value in the middle of the upslope section for a long time. The positions of the high corrosion risk points of the BZ 1-BZ 4 gas gathering line consist with the frequency and the position of the gas-liquid two-phase flow parameters, such as high liquid holdup, slug flow state and high wall shear stress. That is to say, when pipeline operating parameters are given, the position and the risk level of the pipeline high corrosion risk point are seriously affected by the gas liquid flow state. The direct evaluation method of corrosion in pipeline can be used to directly detect the corrosion of the pipeline in No.2 Yanqi well area, which can replace the detection technology of intelligent cleaning in wet gas pipeline.
出处
《天然气与石油》
2017年第1期100-105,共6页
Natural Gas and Oil
关键词
内腐蚀
直接评价
OLGA
间接检测
腐蚀风险
Internal corrosion
Direct assessment
OLGA
Indirect detection
Corrosion risk
