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Automatic optimisation of oilfield scale inhibitor squeeze treatments


Oilfield scale deposition is a serious challenge facing the oil and gas industry. Among the available techniques to prevent formation of scale deposition, squeeze treatment is one of the most efficient and common techniques. Squeeze treatments consists of the injection of chemical scale inhibitor followed by an overflush stage. The chemical will prevent scale deposition if the concentration of inhibitor in the produced brine is above a certain concentration level, known as the Minimum Inhibitor Concentration (MIC).

The main purpose of this paper is to present squeeze treatments designs for a field case with a specified target lifetime. The methodology presented in this paper includes an optimisation algorithm suitable for this complex real life problem. The algorithm, which is described, presents a number of optimum designs, from amongst which the Pareto optimal front is calculated to identify the most efficient design for the particular conditions of the well under risk of scale deposition.