The permeability recovery rate of reservoir cores contaminated by PGP-3 treated drilling fluid of optimal composition is higher (>90%) than that by a 3% MMH fluid and the MMH fluid with 3% temporarily plugging/shielding agent YFP added.

• 最佳配方PGP 3钻井液污染后岩心的渗透率恢复率超过 90%25 ,高于 3%25MMH钻井液及加入屏蔽暂堵剂YFP的 3%25MMH钻井液污染后岩心的渗透率恢复率。