Study on the Transient Flow Law of Shutdown and Restart of Oil and Gas Mixed Pipelines with Multiple Fluctuations and Large Height Differences

doi:10.3969/j.issn.1672-6952.2022.02.009

Journal of Liaoning Petrochemical University ›› 2022, Vol. 42 ›› Issue (2): 55-60.DOI: 10.3969/j.issn.1672-6952.2022.02.009

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Study on the Transient Flow Law of Shutdown and Restart of Oil and Gas Mixed Pipelines with Multiple Fluctuations and Large Height Differences

Jianing Li¹(), Shengnan Du¹(), Kaifeng Fan¹, Kai Chao², Xuesong Huang², Wei Li³, Weiqiang Wang¹

^1.College of Petroleum Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China
^2.Petroleum Engineering Technology Institute，Zhongyuan Oilfield Company SINOPEC，Puyang Henan 457000，China
^3.Inner Mongolia Oil Production Plant，Zhongyuan Oilfield Company SINOPEC，Bayannur Inner Mongolia 015000，China

Received:2021-03-29 Revised:2021-04-23 Published:2022-04-25 Online:2022-05-21
Contact: Shengnan Du

多起伏大高差油气混输管道停输和再启动瞬态流动规律研究

李嘉宁¹(), 杜胜男¹(), 范开峰¹, 晁凯², 黄雪松², 李伟³, 王卫强¹

^1.辽宁石油化工大学石油天然气工程学院，辽宁抚顺 113001
^2.中国石化中原油田分公司石油工程技术研究院，河南濮阳 457000
^3.中国石化中原油田分公司内蒙采油厂，内蒙古巴彦淖尔 015000

通讯作者: 杜胜男
作者简介:李嘉宁（1995⁃），男，硕士研究生，从事油气长距离管输技术研究；E⁃mail：ljn19951218@163.com。
基金资助:
辽宁省教育厅项目(L20190008)

Abstract

Abstract:

The geometric model of a certain oil and gas mixed transportation pipeline was established with OLGA software, and the transient flow law during the pipeline shutdown and restart process was studied. First, the distribution characteristics of temperature, pressure and liquid holdup along the pipeline during steady state operation were analyzed, and the location of the minimum temperature and the location of the maximum pressure along the pipeline were determined. The influence of environmental temperature and shutdown time on operating parameters were analyzed. The safe shutdown time when the minimum temperature temperature is higher than its freezing point was determined. In the actual operation process, the shutdown time should not exceed the safe shutdown time, otherwise problems such as pipeline condensation and excessive starting pressure will easily occur, which threaten the safety of the pipeline.

Key words: Oil and gas mixed transportation pipeline, Shutdown and restart, Liquid holdup rate, Temperature drop, Numerical simulation

摘要：

采用OLGA软件建立了某油气混输管道几何模型，研究了管道停输和再启动过程中的瞬态流动规律。首先，分析了管道稳态运行时沿线温度、压力和持液率的分布特点，确定了沿线温度最小值所处位置及压力最大值所处位置，分析了环境温度和停输时间对运行参数的影响，确定了可保证温度最低点处原油温度高于其凝点的安全停输时间。在实际运行过程中，停输时间不应超过安全停输时间，否则容易出现管道凝管、启动压力过大等问题，威胁管道的安全运行。

关键词: 油气混输管道, 停输再启动, 持液率, 温降, 数值模拟

CLC Number:

TE83

Jianing Li, Shengnan Du, Kaifeng Fan, Kai Chao, Xuesong Huang, Wei Li, Weiqiang Wang. Study on the Transient Flow Law of Shutdown and Restart of Oil and Gas Mixed Pipelines with Multiple Fluctuations and Large Height Differences[J]. Journal of Liaoning Petrochemical University, 2022, 42(2): 55-60.

李嘉宁, 杜胜男, 范开峰, 晁凯, 黄雪松, 李伟, 王卫强. 多起伏大高差油气混输管道停输和再启动瞬态流动规律研究[J]. 辽宁石油化工大学学报, 2022, 42(2): 55-60.

Figures/Tables 9

References 16

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组分	摩尔分数/%	摩尔质量/ （g·mol^－1）	密度/ （g·cm^－³）
CO₂	2.088	28.013 5
N₂	1.987	44.009 8
C1	56.672	16.042 9
C2	11.903	30.069 8
C3	5.212	44.096 8
iC4	1.025	58.123 7
nC4	1.721	58.123 7
iC5	0.921	72.150 6
nC5	1.029	72.150 6
C6	1.738	86.178 0	0.664 0
C7	1.779	96.000 0	0.738 0
C8	2.003	107.000 0	0.765 0
C9	1.649	121.000 0	0.781 0
C10	1.097	134.000 0	0.792 0
C11+	9.175	181.300 0	0.832 0

组分	摩尔分数/%	摩尔质量/ （g·mol^－1）	密度/ （g·cm^－³）
CO₂	2.088	28.013 5
N₂	1.987	44.009 8
C1	56.672	16.042 9
C2	11.903	30.069 8
C3	5.212	44.096 8
iC4	1.025	58.123 7
nC4	1.721	58.123 7
iC5	0.921	72.150 6
nC5	1.029	72.150 6
C6	1.738	86.178 0	0.664 0
C7	1.779	96.000 0	0.738 0
C8	2.003	107.000 0	0.765 0
C9	1.649	121.000 0	0.781 0
C10	1.097	134.000 0	0.792 0
C11+	9.175	181.300 0	0.832 0

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Study on the Transient Flow Law of Shutdown and Restart of Oil and Gas Mixed Pipelines with Multiple Fluctuations and Large Height Differences

多起伏大高差油气混输管道停输和再启动瞬态流动规律研究

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References 16

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