Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

›› 2011, Vol. 19 ›› Issue (1): 26-32.

Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

罗小明, 何利民, 马华伟

Department of Storage&Transportation Engineering, China University of Petroleum, Qingdao 266555, China

收稿日期:2010-04-07 修回日期:2010-12-12 出版日期:2011-02-28 发布日期:2011-02-28
通讯作者: LUO Xiaoming, E-mail: luo-xiaoming@163.com
基金资助:
Supported by the National High Technology Research and Development Program of China(2006AA09Z302)

Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

LUO Xiaoming, HE Limin, MA Huawei

Department of Storage&Transportation Engineering, China University of Petroleum, Qingdao 266555, China

Received:2010-04-07 Revised:2010-12-12 Online:2011-02-28 Published:2011-02-28
Supported by:
Supported by the National High Technology Research and Development Program of China(2006AA09Z302)

摘要/Abstract

摘要： During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure fluctuation of severe slugging were studied in an experimental simulation system with inner diameter of 0.051 m.It is found that severe slugging can be divided into three severe slugging regimes:regime I at low gas and liquid flow rates with large pressure fluctuation,intermittent flow of liquid and gas in the riser,and apparent cutoff of liquid phase,regime Ⅱ at high gas flow rate with non-periodic fluctuation and discontinuous liquid outflow and no gas cutoff,regime ⅡI at high liquid flow rate with degenerative pressure fluctuation in form of relatively stable bubbly or plug flow.The results indicate that severe slugging still occurs when the declination angle of pipeline is 0,and there are mainly two kinds of regimes:regime I and regime Ⅱ.As the angle increases,the formation ranges of regime I and regime ⅡI increase slightly while that of regime Ⅱ is not affected.With the increase of gas superficial velocity and liquid superficial velocity,the pressure fluctuation at the bottom of riser increases initially and then decreases.The maximum value of pressure fluctuation occurs at the transition boundary of regimes I and Ⅱ.

关键词: multiphase flow, severe slugging, pipeline-riser system, flow regime, pressure fluctuation

Abstract: During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure fluctuation of severe slugging were studied in an experimental simulation system with inner diameter of 0.051 m.It is found that severe slugging can be divided into three severe slugging regimes:regime I at low gas and liquid flow rates with large pressure fluctuation,intermittent flow of liquid and gas in the riser,and apparent cutoff of liquid phase,regime Ⅱ at high gas flow rate with non-periodic fluctuation and discontinuous liquid outflow and no gas cutoff,regime ⅡI at high liquid flow rate with degenerative pressure fluctuation in form of relatively stable bubbly or plug flow.The results indicate that severe slugging still occurs when the declination angle of pipeline is 0,and there are mainly two kinds of regimes:regime I and regime Ⅱ.As the angle increases,the formation ranges of regime I and regime ⅡI increase slightly while that of regime Ⅱ is not affected.With the increase of gas superficial velocity and liquid superficial velocity,the pressure fluctuation at the bottom of riser increases initially and then decreases.The maximum value of pressure fluctuation occurs at the transition boundary of regimes I and Ⅱ.

Key words: multiphase flow, severe slugging, pipeline-riser system, flow regime, pressure fluctuation

罗小明, 何利民, 马华伟. Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System[J]. , 2011, 19(1): 26-32.

LUO Xiaoming, HE Limin, MA Huawei. Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System[J]. , 2011, 19(1): 26-32.

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Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

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