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

doi:10.11949/0438-1157.20221516

Abstract

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

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

CLC Number:

TQ 051.8

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.

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.

Figures/Tables 17

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

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

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

Fig.3 Grid independence validation

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

Fig.5 Experimental technological process

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

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

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

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

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

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

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

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

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

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

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

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