深水混输管道停输再启动水合物生成风险

发布时间：2018-02-11 04:12

本文关键词： 深水混输管道停输再启动温度压力天然气水合物风险分析　出处：《油气储运》2017年11期 　论文类型：期刊论文

【摘要】：深水长距离混输管道停输再启动容易产生水合物堵塞问题。基于安哥拉某深水区块开发模式,借助PIPEPHASE与OLGA多相流软件,分析混输管道停输再启动天然气水合物生成风险。结果表明:停输2 h后,管内开始出现水合物生成区域;停输再启动前期,海底管道水合物生成区域在井口附近逐渐消失,在海平面附近的立管段则迅速增大;随启动时间的延长,水合物生成区域由两边向中间逐渐缩小,启动6 h后在水深约700 m的立管段消失。基于混输管道温度压力敏感性的定量描述,提出水合物生成风险定性分析方法,分析发现随海管长度、内径及气油比增大,水合物生成风险增大;随含水率增大,水合物生成风险减小。计算结果能够较好地指导多相混输管道选型、路由及混掺比例设计。
[Abstract]:The problem of hydrate blockage is easy to be caused by stopping and restarting deep water long distance mixed pipeline. Based on the development model of a deep water block in Angola, the software of PIPEPHASE and OLGA multiphase flow is used to solve the problem. The paper analyzes the risk of gas hydrate formation by stopping and restarting gas hydrate in mixed pipeline. The results show that the gas hydrate formation area begins to appear in the pipeline after 2 hours of shutdown and restarting, and the gas hydrate formation area of submarine pipeline disappears gradually near the well head in the early stage of shutdown and restarting. The vertical section near sea level increases rapidly, and with the increase of start-up time, the hydrate formation area decreases gradually from both sides to the middle. Based on the quantitative description of temperature and pressure sensitivity of mixed pipeline, a qualitative analysis method of hydrate formation risk is proposed. It is found that the riskiness of hydrate formation increases with the length, inner diameter and gas-oil ratio of the pipeline. The gas hydrate formation risk increases and the hydrate formation risk decreases with the increase of water content. The calculated results can better guide the selection of multiphase pipeline routing and mixing proportion design.
【作者单位】：中国石油大学(华东)石油工程学院;中国石化青岛安全工程研究院;中国石化石油勘探开发研究院;
【基金】：国家自然科学基金资助项目“深水钻井水合物储层-井筒耦合传热传质特性研究”,51374232 教育部“长江学者和创新团队发展计划”项目“海洋油气井钻完井理论与工程”,IRT_14R58
【分类号】：TE832

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