Research Papers: Petroleum Engineering

Theoretical Analysis and Experimental Study of Dynamic Hydrocyclones

[+] Author and Article Information
Lixin Zhao

Mechanical Science and Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, Chinalx_zhao@yahoo.com.cn

Feng Li

Mechanical Science and Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, China

Zhanzhao Ma, Yanqing Hu

Oil Product No. 2, Daqing Oilfield Company, Ltd., Daqing, Heilongjiang 163414, China

J. Energy Resour. Technol 132(4), 042901 (Dec 17, 2010) (6 pages) doi:10.1115/1.4002997 History: Received August 09, 2007; Revised September 29, 2010; Published December 17, 2010

Characteristics of dynamic hydrocyclones are introduced. The advantages of dynamic hydrocyclones, such as wider applicable flowrate range, smaller cut size, etc., are analyzed compared with normally used static hydrocyclones. By analyzing the inside velocity field distributions, the reason why dynamic hydrocyclones have higher efficiency than static ones is further described. Laboratory experiments and field tests of dynamic hydrocyclones were carried out. Relationships of flowrate, outer shell rotation speed, and split ratio with pressure were studied. Pressure and pressure drop inside hydrocyclones were measured and analyzed. The effect of main operating parameters, such as split ratio and rotation speed, on hydrocyclonic separation performance was also studied. It is shown that the rise of split ratio is beneficial for enhancing the separation efficiency, but the split ratio must be controlled in an appropriate range so as to obtain satisfactory separation results. The increase of rotation speed is helpful for the forming of an oil core inside the dynamic hydrocyclone, but the vibration phenomenon should also be avoided. Field tests, as anticipated, indicated satisfactory results.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Structural sketch of dynamic hydrocyclone

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Figure 2

Tangential velocity distribution of dynamic hydrocyclone

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Figure 3

Contrast of tangential velocity fields between static and dynamic hydrocyclones

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Figure 4

Relationship between underflow pressure drop Δpu (represent with piu) and rotation speed n(Qi=3 m3/h, F=10%)

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Figure 5

Relationship between underflow pressure drop Δpu and rotation speed n(n=1450 r/min, F=10%)

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Figure 6

Relationship between split ratio F and inlet pressure pi(n=1450 r/min, Qi=8 m3/h)

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Figure 7

Flow field photos of the testing dynamic hydrocyclone

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Figure 8

Effect of split ratio F on efficiency E under different rotation speeds

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Figure 9

Separation efficiency curves of hydrocyclone DH-1 prototype

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Figure 10

Effect of outer wall length on separation efficiency

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Figure 11

Technological process sketch of dynamic hydrocyclone’s oilfield tests



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