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Research Papers

Performance and Control of Liquid-Liquid Cylindrical Cyclone Separators

[+] Author and Article Information
Rajkumar S. Mathiravedu

 Schlumberger Technology Corporation, 7 Benoi Crescent, Singapore 138678, Singaporermathiravedu@singapore.oilfield.slb.com

Shoubo Wang, Ovadia Shoham

Department of Petroleum Engineering, and Department of Mechanical Engineering, University of Tulsa, Tulsa, OK 74104

Ram S. Mohan

Department of Petroleum Engineering, and Department of Mechanical Engineering, University of Tulsa, Tulsa, OK 74104ram-mohan@utulsa.edu

Jack D. Marrelli

 Chevron Energy Technology Company, Houston, TX 77002

GLCC© -Gas-Liquid Cylindrical Cyclone-Copyright, The University of Tulsa, 1994.

LLCC© -Liquid-Liquid Cylindrical Cyclone-Copyright, The University of Tulsa, 1998.

J. Energy Resour. Technol 132(1), 011001 (Mar 26, 2010) (9 pages) doi:10.1115/1.4001132 History: Received March 27, 2005; Revised January 26, 2010; Published March 26, 2010; Online March 26, 2010

The feasibility of using liquid-liquid cylindrical cyclone (LLCC© ) as a free-water knockout device for bulk separation of oil-water mixtures in the field strongly depends on the implementation of control systems due to its compactness, less residence time, and possible inlet flow variations. In this investigation, the LLCC control dynamics have been studied extensively both theoretically and experimentally. A linear model has been developed for the first time for LLCC separators equipped with underflow watercut control, which enables simulation of the system dynamic behavior. A unique “direct” control strategy is developed and implemented, capable of obtaining clear water in the underflow line and maintaining maximum underflow rate. Dedicated control system simulations are conducted using MATLAB/SIMULINK ® software to simulate the real system dynamic behavior. Detailed experimental investigations are conducted to evaluate the system sensitivity and dynamic behavior of the proposed control strategy. The results demonstrate that the proposed control system is capable of controlling the underflow watercut around its set point by obtaining maximum free-water knockout for a wide range of flow conditions, namely, inlet water concentration of 40% to 95% and inlet mixture velocity of 0.2 m/s to 1.5 m/s.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the LLCC compact separator

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Figure 2

Schematic of the LLCC control system

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Figure 3

Block diagram of the LLCC control system

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Figure 4

Linear model of the LLCC control system

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Figure 5

Root locus for a PI compensated system

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Figure 6

Unit step response for a PI compensated system

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Figure 8

Control system transient response for LLCC watercut control—step input

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Figure 9

Control system transient response for LLCC watercut control—gain sensitivity

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Figure 10

Control system transient response for LLCC watercut control—different step sizes

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Figure 11

LLCC test section

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Figure 12

Effect of inlet water concentration (constant Vm(in)=0.6 m/s)

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Figure 13

Effect of optimum split ratio on liquid-liquid separation in LLCC—Vm=0.6 m/s

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Figure 14

Optimal split ratio phenomenon

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Figure 15

Time response for underflow watercut control (inlet water flow disturbance)

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Figure 16

Time response for underflow watercut control (inlet oil flow disturbance)

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