An Improved Method for Gas Lift Allocation Optimization

[+] Author and Article Information
N. Nishikiori

Arabian Oil Co., Chiyoda-ku, Tokyo 100, Japan

R. A. Redner, D. R. Doty

Department of Mathematics, University of Tulsa, Tulsa, OK 74104-3189

Z. Schmidt

Department of Petroleum Engineering, University of Tulsa, Tulsa, OK 74104-3189

J. Energy Resour. Technol 117(2), 87-92 (Jun 01, 1995) (6 pages) doi:10.1115/1.2835335 History: Received November 25, 1991; Revised October 14, 1994; Online January 22, 2008


A new method for finding the optimum gas injection rates for a group of continuous gas lift wells to maximize the total oil production rate is established. The new method uses a quasi-Newton nonlinear optimization technique which is incorporated with the gradient projection method. The method is capable of accommodating restrictions to the gas injection rates. The only requirement for fast convergence is that a reasonable estimate of the gas injection rates must be supplied as an initial point to the optimization method. A method of estimating the gas injection rates is developed for that purpose. A computer program is developed capable of implementing the new optimization method as well as generating the initial estimate of the gas injection rates. This program is then successfully tested on field data under both unlimited and limited gas supply. The new optimization technique demonstrates superior performance, faster convergence, and greater application.

Copyright © 1995 by The American Society of Mechanical Engineers
Topics: Optimization , Lifts
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