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凝析气田长输管道输送介质大多为气液混输,冬季沿程温降过大,极易导致管道内生成天然气水合物,为了防止天然气水合物生成对长输管道的堵塞,降低管道过流面积。有必要弄清楚水合物形成的条件和原因,以便提出有针对性的解决措施。凝析气大多为多相流输送,以饱和烃组分为主,在输送过程中由于沿线温度、压力的变化极易引起凝析和反凝析现象,在气液混输中,气相含烃量很高,冬季气温低时促进了水合物的生成。通过对水合物形成原因、塔里木某凝析气田气相组分和运行工况的综合研究,找出最大的影响因素,结合实际,提出最有效的解决方案。通过HYSYS模拟计算,找到了防止水合物生成的最佳方法。采取降压生产,油气分输的措施,并在生产中实践成功。所以,防止天然气水合物的生成十分重要。 相似文献
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《当代化工》2020,(4)
天然气凝析液管道采用气液混输技术进行输送,地形起伏可能造成管线内流型复杂和流动不稳定,导致管线低洼处容易产生积液,影响集输效率。采用多相流模拟软件LedaFlow建立某凝析气田集输管道水力模型,模拟分析地形起伏对管线压力和持液率分布的影响,探究削弱地形起伏对压力波动影响的集输条件,模拟分析输气量、管径以及管道出口压力对起伏管道水力特性的影响。研究表明:地形起伏增大了压力和持液率的波动,使流动不稳定。高输量、小管径和低压集输能够削弱地形起伏的影响。高压集输压降小,低压集输压降大,存在最优运行压力使生产成本最低。该研究为气液混输管路输送参数的选取提出了合理化建议,对复杂地貌条件下天然气凝析液集输管道的设计和运行管理具有意义。 相似文献
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周靖 《中国石油和化工标准与质量》2013,(19):171-172,253
本文针对普光气田一期工程投产初期的实际运行情况,通过模拟含饱和水及一定量的凝析水等三种工况时的水力计算,并进行对比分析,得出管道压降过大现象属于非正常工况,管道内应该存有积液等杂质。 相似文献
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为了掌握原油管道投产运行规律,探讨了埋地热油管道投产过程中管内介质温度以及管外土壤温度场的变化规律,并分析土壤导热系数、输量对管内介质和管外土壤温度场的影响,并对不同预热方式进行浅析比选。结果表明:土壤导热系数和管道输量是埋地热油管道投产过程的主要影响因素;闷管预热的能量利用率最高,正向预热效果最好。 相似文献
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天然气凝析液输管道输送过程中会产生少量积液,但对管道压降却影响巨大,本文介绍了目前的低液量管道的界面模型并根据现有实验这些模型的应用情况进行了总结。 相似文献
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本文在分析了榆林气田天然气凝析液混输管线原设计的基础上,结合这条气液混输管线的现场运行状况,对天然气凝析液两相混输管路的工艺设计方法,进行了分析研究。通过横向对比榆林天然气凝析液管线的具体设计数据,纵向对比管线设计数据与现场运行数据的差异,并采用当前较为先进的OLGA工艺设计计算软件对之进行核算,结合以往的工艺设计经验,对目前所采用的天然气凝析液混输管道工艺设计方法提出一些可供参考的新建议和想法。 相似文献
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《Fuel》2007,86(10-11):1409-1416
This paper describes synthesis and evaluation of polymeric additives for improving the flow properties of gas condensate. The additives were prepared by the free-radical initiated polymerization of methacryl esters with styrene and acrylic or methacrylic acid. Polymerization was performed by initiator azo-bis isobutyronitrile in toluene or xylene at 80 °C. The influence of additives structure, composition and molar weight, as well as gas condensate properties on its flow properties was studied. Gas condensate samples from the fields of Kalinovac, Stari Gradac and Molve located in the northern Croatia were used for evaluation of the prepared additives. It was found that the additives efficiency was considerably influenced by their properties and by condensate n-paraffin content and distribution. 相似文献
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煤层气田的特点是煤层气组分较纯,气田单井产量低,井网分布密集且井口数量众多,井口压力较低。由于煤层气田集输管网压力较低,需建设大量管道,投资费用高。研究煤层气集输管道计算影响因素及其规律对管道参数设计和优化、降低管道总体投资具有重要意义。采用多相流模拟软件OLGA建立了煤层气集输管道水力计算模型,模拟分析了管道流量、管径、含水率、进站压力对管道压降参数的影响,得出管径是集输设计的主要影响参数。敏感性分析结果显示煤层气集输管道设计参数的关键影响因素为管径和流量,且管径的影响最大。研究对于煤层气田的集输管道的计算和设计具有指导意义。 相似文献
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截止2013年底,我国天然气主干管道总里程超过了6万km,未来我国天然气管道的管径、压力、钢级将进一步提升。高压天然气需经过调压才能进入中压管道,但传统调压方式仅仅是进行节流,造成了压力能的浪费。探讨利用高压管网与中压管网之间的压差进行液化调峰,这里应用ASPEN HYSYS软件对流程进行了模拟,分析了分流器分流比、中压管网压力变化、气源压力变化、气源温度变化和气源流量变化对流程液化率的影响,并得出相应的结论。 相似文献
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Pipeline transportation of heavy oils as oil-in-water emulsions has been proposed as an alternative to blending the crude oil with natural gas condensate or other diluent. An 18 m long, 0.02 m I.D. closed loop was constructed to investigate the behaviour of an emulsified Cold Lake crude oil under pipeline flow. Pressure drop was measured as a function of flow rate for freshly produced emulsions to establish correlations of friction factor versus Reynolds number. Stability was observed for long term pipeline flow. The time at which the emulsion breakdown occurred was found to be a function of oil concentration and shear rate. The breakdown of the emulsion was clearly indicated by a simultaneous change in the system variables of pressure drop, temperature and power required to turn the pump at constant speed. 相似文献
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Wavy pipes were installed in the pipeline for mitigating severe slugging in pipeline/riser systems. Experimental results have revealed that: with a wavy pipe applied, the operating region of severe slugging is reduced; the severity of severe slugging and oscillation flow is mitigated; the wavy pipe performs better with its outlet located upstream of the riser base. The wavy pipe is essentially reducing the slug length. For severe slugging the wavy pipe works by accelerating the movement of the gas in the pipeline to the riser base; for the oscillation flow it works by mixing the gas/liquid two phases. 相似文献
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介绍了液环真空泵系统的结构及工作原理,分析了其应用现状,对使用中出现液环真空泵气液分离器溢流不畅问题造成真空系统压力周期性波动的原因进行了分析,并提出相应的解决方案,如降低泵入口可凝气体含量,改造溢流管线,解决溢流管线气堵现象。 相似文献