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RESEARCH PAPERS

Use of Multiphase Meters in Process Control for Oil Field Well Testing: Performance Enhancement Through GVF Control

[+] Author and Article Information
Jack D. Marrelli

 Chevron Texaco Energy Technology Company, 2811 Hayes Road, Houston, TX 77082Marrejd@ChevronTexaco.com

Ram S. Mohan

Petroleum Engineering Department and Mechanical Engineering Department,  The University of Tulsa, 600 S. College Avenue, Tulsa, OK 74104

Shoubo Wang

Petroleum Engineering Department and Mechanical Engineering Department,  The University of Tulsa, 600 S. College Avenue, Tulsa, OK 74104

Luis Gomez

Petroleum Engineering Department and Mechanical Engineering Department,  The University of Tulsa, 600 S. College Avenue, Tulsa, OK 74104

Ovadia Shoham

Petroleum Engineering Department and Mechanical Engineering Department,  The University of Tulsa, 600 S. College Avenue, Tulsa, OK 74104

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

J. Energy Resour. Technol 127(4), 293-301 (Mar 04, 2005) (9 pages) doi:10.1115/1.1924467 History: Received February 11, 2005; Revised March 04, 2005

First oil production from a deep-water oil field is to be achieved by the installation of an initial development system (IDS). Well testing is required for field development and reservoir management. The well testing system requires high-accuracy oil and water rates to provide the data needed for decision analysis in ongoing drilling programs. The well testing system must also be integrated with other platform operations, such as well cleanup after drilling. We introduce here, the concept of a multiphase meter in series with conventional separation technology for improved process control. This feedback control loop configuration is simulated in MATLAB and shown to extend the capabilities of both technologies. The principle of gas volume fraction control in two-phase separator liquid lines is shown to be supplementary to conventional level control systems for performance enhancement of oil field well testing. Concepts demonstrated here can also be easily applied as retrofits to existing separation facilities, which show accuracy or upset problems.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Multiphase metering system with GVF and liquid level control

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Figure 2

Multiphase meter possible primary measurements (γ ray absorption, differential pressure, pressure, temperature, dielectric, capacitance, conductance, and inductance)

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Figure 3

Block diagram of GVF and liquid level control

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Figure 4

Multiphase well-test system, basic structure

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Figure 5

Oil rate performance of multiphase Meter X=function of gas liquid fraction, oil water fraction, and viscosity

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Figure 6

Oil rate performance of multiphase meter M=function of gas liquid fraction, oil water fraction, and viscosity

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Figure 7

Oil rate performance of multiphase meter V=function of gas liquid fraction, and oil water fraction

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Figure 8

MATLAB simulator of GVF and liquid level control (GVF is considered to be a function of liquid level and qlout)

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Figure 9

Effects of GVF control on slug levels in large separator GVF=f (level, Qlout), 108″×35′ horizontal vessel 4× increase in vessel size, 250% increase in slug size

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