It is shown that return permeability of MMH drilling fluid weighted by marble or marble/ barite is higher than those of sized salt system and oil based mud .

• MMH钻井液体系用大理石或大理石和重晶石组合加重时,其渗透率恢复值高于盐粒液和油基钻井液体系,是一种优良的保护油层钻井液体系。