倒锥注气强化井下油水分离水力旋流器性能研究

doi:10.11949/0438-1157.20221516

化工学报 ›› 2023, Vol. 74 ›› Issue (3): 1134-1144.DOI: 10.11949/0438-1157.20221516

倒锥注气强化井下油水分离水力旋流器性能研究

李新亚¹^,²(), 邢雷¹^,², 蒋明虎¹^,²(), 赵立新¹^,²

^1.东北石油大学机械科学与工程学院，黑龙江大庆 163318
^2.黑龙江省石油石化多相介质处理及污染防治重点实验室，黑龙江大庆 163318

收稿日期:2022-11-22 修回日期:2022-12-26 出版日期:2023-03-05 发布日期:2023-04-19
通讯作者: 蒋明虎
作者简介:李新亚（1996—），男，博士研究生， 18435368494@163.com
基金资助:
国家自然科学基金区域创新发展联合基金重点支持项目(U21A20104);黑龙江省自然科学基金项目(LH2022E017);黑龙江省自然科学基金（重点）项目(ZD2020E001);大庆市指导性科技计划项目(ZD-2021-38);提高油气采收率教育部重点实验室开放课题项目(NEPU-EOR-2021-004)

Research on performance of downhole oil-water separation hydrocyclone enhanced by inverted cone gas injection

Xinya LI¹^,²(), Lei XING¹^,², Minghu JIANG¹^,²(), Lixin ZHAO¹^,²

^1.School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
^2.Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, Daqing 163318, Heilongjiang, China

Received:2022-11-22 Revised:2022-12-26 Online:2023-03-05 Published:2023-04-19
Contact: Minghu JIANG

摘要/Abstract

摘要：

为了进一步提高井下油水分离水力旋流器的分离性能，提出一种倒锥注气式井下油水分离水力旋流器结构，开展倒锥注气对油水分离性能影响研究。利用数值模拟和实验研究相结合的方法，对不同注气量、含油浓度、分流比、入口流量等操作参数下的流场分布特性和油水分离效率进行分析。结果表明，随着注气量的增加，分离效率呈现先升高后降低的趋势，当注气量为2.034 m³/d时，分离效率达到最大值98.52%；当水力旋流器的入口含油浓度为0.75%、分流比为40%、入口流量为5.4 m³/h时，可获得水力旋流器的最佳分离效率为99.51%，较注气前提高了1.11%。针对注气后的井下油水分离水力旋流器开展室内分离性能实验研究，数值模拟和实验结果呈现相同的变化趋势，验证了倒锥注气强化分离性能的可行性及数值模拟结果的准确性。

关键词: 水力旋流器, 分离强化, 流场分析, 数值模拟, 分离性能, 多相流

Abstract:

In order to further improve the separation performance of downhole oil-water separation hydrocyclone, a structure of downhole oil-water separation hydrocyclone with inverted cone gas injection was proposed, and the influence of inverted cone gas injection on oil-water separation performance was studied. The distribution characteristics of flow field and oil-water separation efficiency of hydrocyclone under different gas injection rates, oil volume fractions, split ratios and inlet flow rates are analyzed via numerical simulation and experimental method. The results show that with the increase of gas injection rate, the separation efficiency increases at first and then decreases. When the gas injection rate is 2.034 m³/d, the separation efficiency reaches the maximum value 98.52%. When the inlet oil volume fraction of the hydrocyclone is 0.75%, the split ratio is 40%, and the inlet flow rate is 5.4 m³/h, the optimal separation efficiency of the hydrocyclone is 99.51%, which is 1.11% higher than that without gas injection. The separation performance experiments of downhole oil-water separation hydrocyclone are carried out. The numerical simulation results are in good agreement with the experimental results. The feasibility of improving separation performance of hydrocyclone by inverted cone gas injection and the accuracy of numerical simulation results are verified.

Key words: hydrocyclone, separation enhancement, flow field analysis, numerical simulation, separation performance, multiphase flow

中图分类号:

TQ 051.8

李新亚, 邢雷, 蒋明虎, 赵立新. 倒锥注气强化井下油水分离水力旋流器性能研究[J]. 化工学报, 2023, 74(3): 1134-1144.

Xinya LI, Lei XING, Minghu JIANG, Lixin ZHAO. Research on performance of downhole oil-water separation hydrocyclone enhanced by inverted cone gas injection[J]. CIESC Journal, 2023, 74(3): 1134-1144.

图/表 17

图1 井下油水分离水力旋流器结构示意图

Fig.1 Structure diagram of downhole oil-water separation hydrocyclone

表1 井下油水分离水力旋流器结构参数

Table 1 Structural parameters of downhole oil-water separation hydrocyclone

主要结构	参数尺寸/mm
旋流器总长L	461
入口腔长度L₁	50
螺旋流道长度L₂	57
柱段旋流腔长度L₃	65
倒锥锥段长度L₄	150
底流管长度L₅	50
溢流口直径d	8
柱段旋流腔直径D	50
柱段倒锥直径D₁	15
底流管直径D₂	25

图2 井下油水分离水力旋流器工作原理

Fig.2 Working principle diagram of downhole oil-water separation hydrocyclone

图3 网格无关性验证

Fig.3 Grid independence validation

图4 井下油水分离水力旋流器流体域网格划分

Fig.4 Meshing model of downhole oil-water separation hydrocyclone

图5 实验工艺流程1—储水罐;2—储油罐;3—变频控制器;4—泵;5—开关阀;6—流量计;7—静态混合器;8—空气压缩机;9—压力表;10—水力旋流器;11—溢流采样烧杯;12—底流采样烧杯;13—入流采样烧杯;14—比色皿;15—红外分光测油仪;16—高速摄像机;17—高速摄像控制器

Fig.5 Experimental technological process

图6 不同注气量下数值模拟油核分布形态

Fig.6 Numerical simulation distribution of oil core at different injection rates

图7 截面S不同注气量下轴向速度变化

Fig.7 Distribution of axial velocity in cross-section S at different gas injection rates

图8 不同注气量下数值模拟分离性能对比

Fig.8 Numerical simulation of separation performance changes at different gas injection rates

图9 不同注气量下模拟和实验油核分布状态对比

Fig.9 Comparison of simulated and experimental distribution of oil cores at different gas injection rates

图10 不同注气量下的模拟与实验分离性能对比

Fig.10 Comparison of simulated and experimental separation performance at different gas injection rates

图11 不同含油浓度下流场内轴向截面油相体积分布云图

Fig.11 Oil phase volume distribution in the axial section of the flow field at different oil volume fractions

图12 不同含油浓度下模拟和实验的分离性能对比

Fig.12 Comparison of simulated and experimental separation performance at different oil volume fractions

图13 不同分流比下模拟和实验分离性能对比

Fig.13 Comparison of simulated and experimental separation performance at different split ratios

图14 不同分流比下切向截面油相体积分布云图

Fig.14 Contours of hydrocyclone oil volume fraction distribution in tangential-sections at different split ratios

图15 不同入口流量下分离性能对比

Fig.15 Comparison of separation performance at different inlet flow rates

图16 不同入口流量下切向速度变化

Fig.16 Distribution of tangential velocity at different inlet flow rates

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倒锥注气强化井下油水分离水力旋流器性能研究

Research on performance of downhole oil-water separation hydrocyclone enhanced by inverted cone gas injection

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