mud cake

Less filtration and thin mud cake, preventing bit from balling;

滤失量小、滤饼薄，可防止钻头泥包；携砂能力强，流变性易于控制；

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Using of new type of flushing fluid treated with mud cake breaker, and aided by large volume of low weight slurry as pad fluid, to minimize the influence of mud cake to the bonding of cement slurry, thus improve the bonding strength and quality.

采用快体冲洗液，并加以大量的低密度水泥浆前置液，尽量消除泥饼对水泥浆胶结的影响，提高界面胶结强度和质量；

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A New Method to Remove Drilling Mud Cake in Fractured Reservoir

一种消除裂缝性储层钻井液滤饼的新方法

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The major disadvantage is the low drive force of the displacement fluid applied to the near-wellbore region, which results in poor sweep of highly sticky drilling fluid and the mud cake at the side bore and thus the incomplete displacement nearby the 2 interfaces.

轴向流顶替存在的最主要的缺点是顶替液对近井壁区的驱动能力弱，对边壁的高粘附钻井液及虚滤饼清除效果差，造成二界面附近难以被替净；

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