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Résumé :
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Continuous gas lifting is the process of increasing oil well production by injecting compressed natural gas, called “lift gas”, into the production tubing of an oil well [ Presented at the SPE Gas Technology Symposium, Calgary, Alberta, Canada, 1996]. This paper considers the problem of optimizing the distribution of a limited supply of lift gas to wells in an oil field using piecewise linearization techniques. Four modeling approaches, proposed by Nemhauser and Woolsey [ Integer and Combinatorial Optimization; J. Wiley: New York, 1988], Foudas [ Nonlinear and Mixed-Integer Optimization: Fundamentals and Applications; Oxford University Press: New York, 1995], Sherali [ Oper. Res. Lett. 2001, 28, 155.], and Keha et al. [ Oper. Res. Lett. 2004, 32, 44.], are presented and the gas lifting problem is solved using each method. Each of the four frameworks is sufficient to solve the problem to global optimality and the method presented by Keha et al. has the best computational performance. The gas lifting problem is used within the context of larger problems such as well scheduling in oil fields [ Comput. Chem. Eng. 2005, 29, 1523.], and this proposed work can be used to make one of the key parts of the well scheduling problem more efficient.
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