严重段塞流,OLGA,模拟研究,对比分析,分离器控制,海底混输管线严重段塞流的预测与制约
海底混输管线严重段塞流的预测与制约
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海底混输管线严重段塞流的预测与制约

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  • 严重段塞流,OLGA,模拟研究,对比分析,分离器控制,
    正文开始
    在海洋油气开采系统中,由于存在大量的输量变化、开井关井等操作,立管系统内多相流动常处于严重段塞流工况。严重段塞流会给海上油气集输系统的设计、运行及管理造成巨大的困难。本文使用OLGA软件对下倾管-立管系统进行了严重段塞流模拟,并与课题组已有严重段塞流实验数据进行对比浅析浅析。在水平-下倾-立管实验系统上开展了分离器制约操作与上游多相流动特性内在关联的实验研究。针对模拟结果,主要从严重段塞流流型分类、周期特性及压力特性三方面与实验数据进行了对比浅析浅析研究。模拟结果与实验数据在严重段塞流特性规律方面表现出了良好的一致性。模拟结果发现了与实验研究相近的严重段塞流流型分类。模拟和实验所反映出的严重段塞流周期随折算气液速度变化的规律大致相同。只是,实验中,严重段塞流的周期值随折算气液速度的增大均快速减小;而模拟时,严重段塞流周期值随折算气速的增大而快速减小,随着折算液速的增加却减小缓慢。模拟和实验反映出的严重段塞流压力特性在下倾管-立管系统上有所差异,但在加水平管的下倾管-立管系统上却完全一致。总体上,使用OLGA软件进行立管系统严重段塞流的模拟预测是完全可行的,尤其对于一些特性规律的探寻和研究非常有益。通过对比浅析浅析,选取分离器定压力制约方案进行实验研究。指出单独的分离器液位制约并不会对系统上游多相流动产生明显影响,但有益于分离器的正常运行及压力制约。随着分离器压力的升高,立管中部压力尖端部分明显缩小,压力的最小值逐渐上升,压力的波动幅值逐渐缩小,严重段塞流液气喷发时,立管内气液相间滑移加剧,立管内气液流动型态从一个大的长气柱高速通过立管逐渐演变成若干个长短不一的气弹在立管中缓慢前行。分离器压力制约对策对系统上游严重段塞流的抑制效果与折算气、液速度的相对大小有关;而与折算气液速度值的绝对大小关系不大。

    【Abstract】WwW.zIdiR.coM In the offshore oil and gas exploitation systems, because of so many changes in throughput and well startup-shutdown operations, the flow pattern in the riser system almost belongs to severe slugging. Severe slugging can cause enormous difficulties to the design, operation and management of the offshore oil/gas gathering and transportation system. The severe slugging in inclined pipeline-riser system is simulated numerically with the software OLGA, and the results are compared with the available experimental datas. The inner relation between the separator operation and control and the upstream multiphase flow characteristics is investigated experimentally in the horizontal/inclined pipeline-riser system.The simulation results and experiment datas are compared and analyzed mainly from the severe slugging flow pattern classification, cyclophysis and pressure characteristics. The comparison demonstrates a good consistency. Simulation result shows a similar classification of severe slugging flow pattern with the experiment data. In experiment results, the cycle time of severe slugging flow decreases rapidly with the increasing gas/liquid superficial velocity. However, the simulation result shows that the cycle time decreases rapidly with the increaseing gas superficial velocity, but when the liquid superficial velocity increases, the cycle time decreases slowly. In the inclined pipeline-riser system, comparison result shows difference in the pressure characteristics, but in the horizontal/inclined pipeline-riser it shows a full agreement. Given all that, OLGA is beneficial to the simulation and prediction of severe slugging in the riser system, especially for the research of characteristics.The separator pressure control program is selected for the experimental investigation. It’s indicated that the sepatator liquid level control does not have a significant impact on the upstream multiphase flow, but it’s beneficial for the normal operation and pressure control of the separator. When the separator pressure increases, the peak-part of the mid-riser pressure apparently diminishes, and the minimum pressure gradually increases, and the fluctuation amplitude of pressure gradually decreases. During the slug blowing out, the gas/liquid slipping in the riser intensifies. The long gas plug quickly flows through the riser, then tends to be several different lengths of gas plugs and flow slowly in the riser. The inhibiting effect of pressure control strategy on the upstream severe slugging has something to do with the relative size of the superficial gas/liquid rate, but it’s not releated to the absolute size of superficial gas/liquid rate.

    【关键词】 严重段塞流; OLGA; 模拟研究; 对比浅析浅析; 分离器制约;
    【Key words】 severe slugging; OLGA; simulation investigation; comparative analysis; separator control;
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