| 摘要: |
| 针对含蜡原油管道蜡沉积会引起回接管道的流动安全问题,研究深水含蜡原油管道蜡沉积规律以及控制措施。使用OLGA软件,对中国南海某深水油田2根233 mm水下回接不保温含蜡原油管道中蜡沉积速度、蜡沉积在管壁的厚度以及清管周期等进行模拟分析,综合考虑蜡沉积厚度和蜡沉积引起的压力增加确定清管周期。结果表明:在投产后前2年,清管周期约35 d,从第3年开始,随着含水量大幅增加,清管周期约60 d;单根233 mm管道最大输液量为7000 m3/d,输液量高于7000 m3/d时需要采用双管输送, FPSO平台上清管所需的最大输液量为4200 m3/d(175 m3/h),发球所需的最大外输泵压力为6000 kPa。 |
| 关键词: 深水油田 含蜡原油 回接管道 蜡沉积 清管周期 OLGA软件 |
| DOI：10.3969/j.issn.1673-5005.2019.03.019 |
| 分类号::TE 646 |
| 文献标识码:A |
| 基金项目:国家科技重大专项(2016ZX05028) |
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| Wax deposition prediction and pigging simulation in waxy crude oil tieback deepwater pipelines |
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YE Bing1, YU Xichong2, PENG Wei3, WU Yaling4
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(1.CNOOC Group, Beijing 100010, China;2.CNOOC Research Institute, Beijing 100028, China;3.CNPC Southwest Oil ＆ Gas Field Company, Luzhou 646001,China;4.China Huanqiu Contracting ＆ Engineering Company Limited, Beijing 100102, China)
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| Abstract: |
| Wax deposition in waxy crude oil pipelines can cause the flow safety problems of the tieback pipes, therefore it is necessary to make a full study on the deposition and control laws for these pipes. In this study, based on certain waxy crude oil tieback flowlines for South China Sea deepwater oil development, the OLGA software is used to simulate transient flow characteristics in waxy crude oil tieback pipelines, such as wax precipitation rate, thickness of the wax layer deposited on the wall, pigging frequency and so on. The results show that, the pigging period is 35 days during the first 2 year after put into production. The pigging periods is 60 days from the third year with the increase of water content. The maximum liquid flow rate for a 233 mm pipeline is 7 000 m3/d. It is suggested that one single pipeline is used to transport while the flow rate is lower than 7 000 m3/d, and two pipelines are used while the flow rate is more than 7 000 m3/d. The maximum pump pressure at FPSO is kept at 6 000 kPa, and the required maximum liquid flow rate at FPSO is 4 200 m3/d(175 m3/h). |
| Key words: deepwater oilfield waxy crude oil tieback pipeline wax deposition pigging period OLGA software |
