When carrying out the filtration experiment, the drilling fluid can only filtrate from the outer wall to the inner wall to form filter cakes at the outer wall, which reflects the real field situation.

• 开展岩心滤失实验时，钻井液只能通过岩，灯外壁向内壁滤失以在外壁上形成滤饼，这与现场实际情况相符合。