Measured downhole pressures from 203 production tests, from six wells located in the Statfjord Formation, were used to compare accuracy of correlations. Conceptual test data describing liquid and gas-condensate wells were sett up to study prediction of pressure drop, and differences between correlations. Production tests from wells located in such areas have been used as basis when analysing multiphase-flow correlations’ ability to model vertical lift performance.Ĭalculations are done in Prosper, a well performance, design and optimization program developed by Petroleum Experts. Wells in the Statfjord Formation have been producing from a gas cap in which some areas of the formation has disappeared. Adequate modelling of vertical lift performance is needed to predict a realistic liquid offtake and thereby pressure-depletion rate. The Statfjord Field has entered a drainage strategy where the reservoir will be depleted such that gas liberates from the remaining oil in the reservoirs.
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