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A Method to Determine the Turbulence Coefficient of High Rate Gas Reservoir

The flow regimes included low velocity non-Darcy flow, Darcy flow, inertia flow, and turbulence in some porous media. In abnormal high pressure gas reservoir, the flow velocity was higher than conventional reservoir. Due to turbulence flow, there would be unique flow characteristics in these reservoirs. The deliverability equation of gas well should be expressed by cubic term, containing Darcy term, Visco-Inertial term and turbulence term, instead of Forchheimer’s quadratic equation. The turbulence coefficient, the main parameter in the cubic term, was directly related to the absolute open flow. So far, there is no method to obtain this parameter based on gas field data. Also there is no acceptable correlation for the turbulence coefficient applicable to field conditions. An empirical correlation was established using multiple linear regression method to determine the turbulence coefficient through the Ka Lasu’s well test data. We also calculated the parameters for the other well in this field. The results show that this correlation is more accurate and more useful than the formula established by Ezevdembah on basis of the core data in laboratory.