[Prediction of output fraction from single layer to commingling oil well by high performance liquid...

For crude oil from the same source, there is no obvious difference in chromatographic fingerprint of total hydrocarbons. But an evident difference in the concentrations of the series compounds of naphthalene and phenanthrene in oils has been found. Based on the fact, a new method for determine production allocation in commingled production, has been proposed. In this method, the series compounds of naphthalene and phenanthrene are selected as geochemistry indicator and are pretreated with aluminum oxide-silica gel column, and their relative concentration is determined by HPLC. Being verified by artificially mixing samples, the method can be used for the oils that can not be differentiated with the chromatographic fingerprint of total hydrocarbons, and error between predicted value and real value is 8% and its accuracy is better than that of the gas chromatographic fingerprint method. Based on the mixture principle, a model for prediction of output fraction of single oil layer is proposed. This model has been applied to production allocation calculation.