Optimal selection of utility plants in oil and gas offshore platforms

摘要

The utility plants in oil and gas platforms should be designed to meet the electrical demand during the lifetime at minimum cost. A great deal of effort has been devoted to determining the optimal load share of each reciprocating engine/gas turbine operating in parallel that minimizes the overall fuel consumption. However, the selection of the models and the number of units in the system are normally left out of the problem formulation. This paper introduces a procedure to make the optimal selection of utility plants in floating, production, storage and offloading platforms. It is analyzed a case study by using the following two alternative approaches: (i) a mono-objective optimization of a single cost-based function and (ii) a multi-objective optimization of capital cost and fuel consumption. Under the first approach, the fuel consumption is translated into monetary terms. On the other hand, the multi-objective approach produces a set of nondominated solutions that enables a subsequent engineering analysis. A major takeaway from the case study is that all the solutions obtained are better than the standard solution of three aeroderivative gas turbines model GE LM2500+RD (G4) (with a capital cost of 40.05 Millions of USD and a fuel consumption of 9.999×104documentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$9.999 times 10^4$$end{document} TJ at the optimal setting during the lifetime of the system). The results confirm the necessity of a systematic selection procedure.