Cellar Plugged with Mud During 26inch Casing Drilling 1. Causes: Excessive spillage of drilling mud from the wellbore during large-diameter drilling. Insufficient drainage or poor cellar design, leading to accumulation of cuttings and mud. High pump rates and mud volume during spudding or top-hole drilling, especially in unconsolidated formations. Lack of proper flow control or redirection around the wellhead. 2. Consequences: Restricted access to wellhead equipment. Difficulties in running and

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