Multiphase flow measurements: Vankor experience

Authors: R.R. Bakhitov, Yu.M. Trushin, S.V. Zimin, A.A. Semenov (Vankorneft CJSC)
Provision for oil, gas, and water surface rate measurements from every production well is one of the most required issues for effective field development management. Due to the oil degassing during lift to the surface, gas and water breakthroughs, and high liquid rates, this task has become serious challenge for the Vankor wells. Preliminary, cyclone-based gas-separators have been considered in the field as the means for primary phase separation and consequent measurement of the each phase rate using Coriolis-based mass metering units. Another unit type for multiphase flow rate measurements uses Venturi tube and radioactive source for gas and water holdups measurement. Inflow performance relationships were plotted, average well drainage area was estimated, and reservoir properties distribution was précised based on the improvement of measurement accuracy.
Provision for oil, gas, and water surface rate measurements from every production well is one of the most required issues for effective field development management. Due to the oil degassing during lift to the surface, gas and water breakthroughs, and high liquid rates, this task has become serious challenge for the Vankor wells. Preliminary, cyclone-based gas-separators have been considered in the field as the means for primary phase separation and consequent measurement of the each phase rate using Coriolis-based mass metering units. Another unit type for multiphase flow rate measurements uses Venturi tube and radioactive source for gas and water holdups measurement. Inflow performance relationships were plotted, average well drainage area was estimated, and reservoir properties distribution was précised based on the improvement of measurement accuracy.


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