Productivity Loss in Gas Condensate Reservoirs

Abstract

ABSTRACT Gas condensate wells, producing at a flowing bottom-hole pressure below the dewpoint suffer a more rapid decline in productivity than that predicted in theory for dry gas wells. The loss in productivity is caused by a liquid hydrocarbon accumulation near the well bore. A compositional one-dimensional radial model has been used to predict the performance of a gas condensate well. The effect of composition (fluid properties, liquid dropout rate) and gas-oil relative permeability on gas productivity have been investigated. Results show that relative permeability data is the most sensitive parameter in determining productivity loss. The predicted productivity decline of a gas condensate well using drainage and imbibition relative permeability data vary considerably.