Experiment on drag reduction of heavy oil in horizontal pipeline by water annular conveying

doi:10.11949/j.issn.0438-1157.20181285

Abstract

Abstract:

With the increase of oil exploitation, the transportation of heavy oil with higher viscosity has received more and more attention. Based on the self-designed two-phase flow water annular transport heavy oil experimental system, the water annular transport heavy oil experiment was simulated and carried out. The flow pattern of the water annular generator under different gaps is captured, and the drag reduction effect of heavy oil transportation by water annular under different experimental conditions was analyzed. The experimental and simulated results show that the pressure drop in pipeline transportation can be greatly reduced by water annular conveying, and the water annular generator has the best drag reduction effect when the gap size is 0.9—1.4 mm. The pressure drop per unit pipeline will increase with flow rate, and high flow rate will reduce the drag reduction effect of water annular transportation.

Key words: petroleum, viscosity, two-phase flow, water annular, pressure drop, drag reduction, experiment

摘要：

随着石油开采的增加，黏度较大的稠油输送受到越来越多的关注。基于自主设计的两相流水环输送稠油实验系统，模拟并开展了水环输送稠油实验。拍摄了水环发生器在不同间隙尺寸下的流动流型，分析了不同实验条件下的水环输送稠油减阻效果。结果表明：水环输送可以大大降低管道输送过程中压降；结合实验和模拟，水环发生器间隙尺寸在0.9～1.4 mm时，水环的减阻效果最好；流速增加会增大单位管道上的压降，降低水环输送的减阻效果。

关键词: 石油, 黏度, 两相流, 水环, 压降, 减阻, 实验

CLC Number:

TE 832

Junqiang WU, Wenming JIANG, Shilin DU, Yang LIU. Experiment on drag reduction of heavy oil in horizontal pipeline by water annular conveying[J]. CIESC Journal, 2019, 70(5): 1734-1741.

吴君强, 蒋文明, 杜仕林, 刘杨. 水平管路水环输送稠油减阻模拟实验[J]. 化工学报, 2019, 70(5): 1734-1741.

Figures/Tables 13

Fig.1 Experimental system of heavy oil transportation by water annular

Fig.2 Structure of water annular generator

Table 1 Experimental instruments and materials

Instrument	Model
water pump	WCB75
oil pump	YBHW3-80M1-2
pressure gauge	LD-Y190
high speed camera	HX-7
lubricating oil	L-HM68
dyeing agent	oil soluble dyes

Fig.3 Schematic diagram and shooting map of water annular

Fig.4 Pipeline pressure distribution of single-phase water, single-phase oil and water annular

Fig.5 Pressure drop diagram of water ring generator under different gap size

Fig.6 Schematic diagram of instability of water annular

Fig.7 Flow pattern of water annular captured by high speed camera

Fig.8 Distribution of oil volume fraction in pipeline under different gaps

Fig.9 Distribution of cross-section of heavy oil volume fraction pipelines under different gaps

Fig.10 Axial pressure distribution at different gap conditions

Table 2 Experimental data on pressure drop for core- annular flow under different gaps

Oil velocity/ (m/s)	Water velocity/(m/s)	Gap size/mm	Pressure drop/(Pa/m)
0.8	0.8	0.9	800
0.8	0.8	1.4	1000
0.8	0.8	1.9	1200
1.0	1.0	0.9	901
1.0	1.0	1.4	1122
1.0	1.0	1.9	1357
1.2	1.2	0.9	1024
1.2	1.2	1.4	1249
1.2	1.2	1.9	1489
1.4	1.4	0.9	1142
1.4	1.4	1.4	1389
1.4	1.4	1.9	1596
1.6	1.6	0.9	1357
1.6	1.6	1.4	1539
1.6	1.6	1.9	1799

Fig.11 Pressure drop diagram at different flow velocity

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