低渗透气藏地层损害的特殊性

Characteristic of formation damage in low permeability reservoir

低渗透气藏的地层损害具有压力敏感性高、液体滞留效应严重和反向吸入现象明显的特点。采用减小生产压差、应用气体或含气钻井液、合理选择最小过平衡压力或减小气水界面张力的方法,可以预防和减轻地层损害。

Formation damage in low permeability reservoir possesses the characteristic of high sensitivity to pressure, serious liquid blockup and obvious drilling fluid invasion to formation. Formation damage can be prevented by reducing differential pressure, using aerated drilling fluid, choosing the lowest over balance pressure or reducing the interface tension of gas and water.