Float valve

Drilling Equipment & Components

A float valve (or non-return valve) is installed in the BHA, typically just above the bit. It allows drilling fluid to be pumped down the drillstring but prevents formation fluids or cuttings from flowing back up inside the pipe (U-tubing) when circulation stops.

Using a float valve is an important well control measure. It prevents the drill pipe from becoming partially filled with influx during a connection, providing an immediate internal barrier. However, it also means the pipe must be manually filled when tripping into the hole to prevent collapse pressure damage.