Fracturing fluid may jeopardize the production of hydraulically fractured tight gas formations. Ascapillary forces are acting stronger in low permeable formation, the invaded fracturing fluid is harder to be removed. The increase of water saturation around the fractured well affects the mobility of the gas phase, particularly in tight formations where the gas relative permeability declines stronglywhen water saturation increases. This damage might greatly reduce the gas production in a very long cleanup period. This paper presents numerical simulation techniques to account for formation damage with both a near-well model and a full-field model for fractured wells in tight formations and to integrate damage effects in a full-field reservoir model through an efficient coupled modelling.

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