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bypassed mud

1. n. [Drilling Fluids]

Mud that is left somewhere in the wellbore when some other fluid is pumped into the well. This can occur when pumping an oil mud into a well to displace a water mud. The bypassed water mud becomes a contaminant in the oil mud when it gets mixed into the circulating system. Drilling mud may be bypassed behind a casing or a liner when pumping cement into the casing or wellbore annular region. This mud-contaminated cement might not set up and might not satisfactorily isolate zones.

See: oil mudwater mud