Study on Dilute Performance of Follow⁃Up Dynamic Mixer

doi:10.3969/j.issn.1006-396X.2021.04.011

Abstract

Abstract:

Because of the ineffective dilution process of heavy oil of the primary mixers, the face type spiral blade was selected as the mixing element and the dynamic impeller was added as well, in order to enhance the shear capacity and rotation frequency of the blade. The two parameters of blade pitch and power impeller that effect the mixing effect of the dynamic mixer were numerically simulated and analyzed using the CFD simulation software. Taking the volume distribution of thin oil in the tube as the evaluation standard, the influence of geometric structure of the mixing element to performances of the mixer during the mixing process was studied. The results show that if the blade pitch is too small, it will hinder the flow of fluid in the tube causing the decrease of mixing rate, and if it is too large, it will cause the fluid forward channeling. Much fewer power impellers will reduce the frequency of component rotation, but much more ones will hinder the forward flow of fluid. Finally, the mixing performance of the novel optimized follow?up dynamic mixer was compared with the original mixer. The volume distribution of the thin oil in the new follow?up dynamic mixer is more uniform, which can greatly enhance the mixing effect of thick oil, and is also beneficial to the exploitation of heavy oil resources.

Key words: Heavy oil mixed with dilute, Dynamic mixer, Numerical simulation, Spiral blade

摘要：

针对稠油掺稀过程中原混合器混合效果不佳的问题，选择满面式螺旋叶片作为混合元件，增加动力叶轮，以增强叶片对流体的剪切能力和转动频率。基于CFD仿真软件，对影响动态混合器混合效果的叶片螺距和动力叶轮两参数进行数值模拟分析，并以管内稀油体积分布情况作为评价标准，研究混合过程中混合元件几何结构的变化对混合器性能的影响规律。结果表明，叶片螺距过小将阻碍流体在管内流动，导致混合速率降低，过大则会产生流体前窜现象；动力叶轮过少则会降低元件转动频率，过多则会阻碍流体向前流动。最后将优化后的新型随动式动态混合器与原混合器混合性能进行对比，新型随动式动态混合器内稀油体积分布更为均匀，能够更好地增强稠油掺稀混合效果，有利于稠油资源的开采。

关键词: 稠油掺稀, 动态混合器, 数值模拟, 螺旋叶片

CLC Number:

TE35

Yuexin Li, Chunli Zhao, Yuzhu Zhang, Yue He, Shuangchun Yang. Study on Dilute Performance of Follow⁃Up Dynamic Mixer[J]. Journal of Petrochemical Universities, 2021, 34(4): 66-71.

李悦欣, 赵春立, 张玉柱, 何跃, 杨双春. 随动式动态混合器掺稀混合性能研究[J]. 石油化工高等学校学报, 2021, 34(4): 66-71.

Figures/Tables 13

Fig.1 Schematic diagram of dilution under pump

Table1 Parameters of heavy oil and thin oil

油品	动力黏度/（mPa·s）	密度/（kg $⋅$ m^-3）	流速/（m $⋅$ s^-1）
稠油	4 700	970	0.45
稀油	20	820	0.45

Table1 Parameters of heavy oil and thin oil

油品	动力黏度/（mPa·s）	密度/（kg $⋅$ m^-3）	流速/（m $⋅$ s^-1）
稠油	4 700	970	0.45
稀油	20	820	0.45

Fig.2 Original hybrid element structure

Fig.3 Original dynamic mixer structure

Fig.4 Volume fraction distribution of thin oil at Z=420 mm section of original dynamic mixer

Fig.5 Volume fraction distribution of dilute oil in the mixing process

Fig.6 New hybrid element structurer

Fig.7 New structure of dynamic mixer

Table 2 Structure dimension table of new dynamic mixer

结构参数	数值
混合器长度L/mm	460
混合器内径D/mm	50
稠油入口直径d/mm	34.34
螺旋叶片直径a/mm	40
中心轴直径b/mm	8
螺旋叶片总长l/mm	200
螺旋叶片螺距p/mm	30、40、50、60
动力叶轮叶片倾角β/（°）	30
动力叶轮叶片数量n/个	4、5、6、7

Fig.8 Volume fraction distribution of thin oil in pipe with different pitch

Fig.9 Volume fraction distribution of thin oil in pipe with different number of blades

Fig.10 Comparison of volume fraction distribution of thin oil in pipe

Fig.11 Thin oil volume fraction distribution curve at Z=420 mm section

References 16

1	顾琳婕，黄启玉，马桂霞，等.掺稀质量对油井产出液降黏效果的影响［J］.辽宁石油化工大学学报，2011，31（1）：1⁃4.
	Gu L J，Huang Q Y，Ma G X，et al.Effects of light oil on rheology behavior of produced mixture［J］.Journal of Liaoning Shihua University，2011，31（1）：1⁃4.
2	王大威，靖波，梁守成，等.掺稀降黏技术研究及其在渤海Q油田应用评价［J］.现代化工，2019，39（11）：175⁃179.
	Wang D W，Jing B，Liang S C，et al.Study and application evaluation of blending lean oil technology in Bohai Q oilfield［J］.Modern Chemical Industry，2019，39（11）：175⁃179.
3	任向海，朱莲花，张园，等.分流式掺稀混配器的研制及性能试验［J］.石油钻探技术，2018，46（6）：95⁃99.
	Ren X H，Zhu L H，Zhang Y，et al.Development and performance testing of a shunting dilute mixer［J］.Petroleum Drilling Techniques，2018，46（6）：95⁃99.
4	禹言芳，孟辉波，龚斌，等.推进式搅拌混合器内湍流特性研究［J］.石油化工高等学校学报，2008，21（3）：79⁃82.
	Yu Y F，Meng H B，Gong B，et al.Investigation of the turbulent flow characteristic in a stirred mixer with propeller［J］.Journal of Petrochemical Universities，2008，21（3）：79⁃82.
5	张园，彭振华，高定祥，等.芯管式稠油掺稀混合器设计及其掺混性能研究［J］.工程设计学报，2018，25（5）：510⁃517.
	Zhang Y，Peng Z H，Gao D X，et al.Design and mixing performance research of core tube heavy oil mixing and diluting mixer［J］.Chinese Journal of Engineering Design，2018，25（5）：510⁃517.
6	黄凤磊，刘淼，李志鹏，等.共混用动态混合器的研究与应用进展［J］.化工进展，2017，36（10）：3549⁃3557.
	Huang F L，Liu M，Li Z P，et al.Research and application progress of dynamic mixer for polymer blending［J］.Chemical Industry and Engineering Progress，2017，36（10）：3549⁃3557.
7	王宗勇，由智丹，丁桂彬，等.叶片宽度比对同心双螺旋静态混合器混合性能的影响［J］.北京化工大学学报（自然科学版），2020，47（1）：53⁃60.
	Wang Z Y，You Z D，Ding G B，et al.Effect of twisted elements aspects ratio on the mixing performance of a concentric double helix static mixer［J］.Journal of Beijing University of Chemical Technology（Natural Science），2020，47（1）：53⁃60.
8	龚斌，包忠平，张春梅，等.混合元件数对SK型静态混合器流场特性的影响［J］.化工学报，2009，60（8）：1974⁃1980.
	Gong B，Bao Z P，Zhang C M，et al.Effect of number of mixing elements on flow field in Kenics static mixer［J］.Journal of Chemical Industry and Engineering，2009，60（8）：1974⁃1980.
9	张吕鸿，董佳鑫，周雪松，等.新型三次采油用静态混合器组合的性能研究［J］.天津大学学报（自然科学与工程技术版），2015，48（10）：894⁃900.
	Zhang L H，Dong J X，Zhou X S，et al.Performance of a novel static mixer combination for tertiary recovery process［J］. Journal of Tianjin University（Science and Technology），2015，48（10）：894⁃900.
10	王峰，阎华，关昌峰，等.转子间隔排布的随动式动态混合器的模拟研究［J］.机械设计与制造，2014（4）：185⁃187.
	Wang F，Yan H，Guan C F，et al.Numerical simulation of the servo dynamic mixer in which the rotors arranged with intervals［J］.Machinery Design & Manufacture，2014（4）：185⁃187.
11	刘娇. 动态混合器混合性能的理论及实验研究［D］.北京：北京化工大学，2016.
12	靳永红. 塔河油田十二区电泵井掺稀工艺关键技术研究［D］.成都：西南石油大学，2016.
13	甘振维，林涛.稠油叶轮自动旋转高效降粘器：中国，200920140210.5［P］.2010.
14	李琴，彭云，黄志强，等.稠油掺稀井下动态混合器数值模拟研究［J］.石油机械，2014，42（4）：72⁃76.
	Li Q，Peng Y，Huang Z Q，et al.Numerical simulation of the downhole dynamic mixer for heavy oil thin mixing［J］.China Petroleum Machinery，2014，42（4）：72⁃76.
15	Thankur R K，Vial C，Nigam K D P，et al.Static mixers in the process industries：A review［J］.Chemical Engineering Research & Design，2003，81（7）：787⁃826.
16	蒋金云，孔令熙，李健，等.凹槽型高效动态混合器分流数混合效果评价［J］.塑料，2014，43（3）：100⁃102.
	Jiang J Y，Kong L X，Li J，et al.Assessment of groove type dynamic mixer with high efficiency by number of striations［J］.Plastics，2014，43（3）：100⁃102.

[1]	Peng Jia, Jiaqing Chen, Xiaolei Cai, Lingzhen Kong, Chunsheng Wang, Chao Shang, Ming Zhang, Yi Shi. Study on Oil⁃Water Separation Characteristics of Hydrocyclone Based on CFD⁃PBM Numerical Simulation [J]. Journal of Petrochemical Universities, 2021, 34(4): 58-65.
[2]	Yang Wenwu. Research of Well Pattern Adjustment by Streamline Variation on Main Productive Layers in Post⁃Polymer Flooding Block B [J]. Journal of Petrochemical Universities, 2021, 34(2): 54-59.
[3]	Zhang Jicheng， Yan Zhiming， Fan Jiale， Bao Zhikui. Calibration of Grid Upscaling Effect by Segmental Translation Phase Permeability Curve Method [J]. Journal of Petrochemical Universities, 2021, 34(1): 50-57.
[4]	Zhang Jing， Pang Yanping， Li Zhimin， Wang Zhihua. Effect of Dissolved⁃Air Flotation on Flow Field Characteristics of Produced Water in Settlement Separation Process [J]. Journal of Petrochemical Universities, 2021, 34(1): 72-79.
[5]	Tian Yangyang， Zhang Chunying， Niu Zhenyu， He Limin. Numerical Simulation of Oil Droplet Dispersion Characteristics in High Water⁃Bearing Swirling Turbulent Flow Field [J]. Journal of Petrochemical Universities, 2020, 33(6): 56-63.
[6]	Wang Bo， Chen Yiming， Du Shengnan， Wang Weiqiang. Numerical Simulation of Infinitely Large Plate Thermal Diffusion Based on CFD Method [J]. Journal of Petrochemical Universities, 2020, 33(6): 79-84.
[7]	Wu Chuanchang， Fan Fei， Zhou Qingqing， Kong Fansheng， Shen Ling， Guan Feng. Numerical Simulation of the Fluidization Characteristics in Fluidized Bed with Rotating Sieve Tray [J]. Journal of Petrochemical Universities, 2020, 33(6): 85-90.
[8]	Du Mingjun, Yang Zining, Teng Yu, Ma Kedi, Jiao Yadong, Xu Yi. Experimental and Numerical Simulation of Down Hole Insulated Tubing [J]. Journal of Petrochemical Universities, 2020, 33(4): 75-79.
[9]	Su Zhan, Li Wei, Huang Hongliang, Wang Xudong, Zheng Zhidong. Research on Three⁃Dimensional Percolation Model of Reservoir Rock [J]. Journal of Petrochemical Universities, 2020, 33(3): 60-66.
[10]	Liu Renwei, Yang Tianyu, Wan Yufei, Jiang Shuhong, Huang Zhe. Numerical Simulation on Dispersion of Thermal Recovery Blowout Gas on Offshore Platform [J]. Journal of Petrochemical Universities, 2020, 33(3): 74-79.
[11]	Wu Xiao, Wang Zhaoting, Shi Yao. Simulation of Flow Characteristics of Gas⁃Liquid Slug Flow in Horizontal Pipe [J]. Journal of Petrochemical Universities, 2020, 33(3): 80-85.
[12]	Luo Hanqiu1， Jiang Tingting2. Formulation of Weak⁃Alkaline ASP Flooding System Suitable for the Three Types of Oil Layers [J]. Journal of Petrochemical Universities, 2020, 33(2): 37-41.
[13]	. Change of Development Characteristics during Drilling and Shut⁃in Process：Taking B3 East Block as an Example [J]. Journal of Petrochemical Universities, 2020, 33(1): 23-29.
[14]	Fan Haijiao，Yang Erlong. Optimization of Production and Injection Rate of Water Flooding and Chemical Flooding in Second Tertiary Development Mode [J]. Journal of Petrochemical Universities, 2019, 32(5): 90-95.
[15]	Liu Yinsong，Yao Shangkong，Yang Erlong. Reasonable Formation Pressure in the West Part of Central Block in Saertu of Daqing Oilfield [J]. Journal of Petrochemical Universities, 2019, 32(3): 82-86.