Fill Drill

The casing drill is reciprocated axially and rotationally in response to an axial downhole and uphole stroking of the casing string. This reciprocating action engaging the obstruction aids in loosening and clearing the obstruction. Drilling fluids can be circulated through the casing drill for removing materials loosened by the casing drill. Drilling fluids convey the loosened materials up the annulus.

Axial movement of the mandrel, which is fixed to the casing, causes the sleeve to reciprocate one direction and then the other. Typically, a downhole stroke of 5 feet causes the sleeve to rotate in one direction and a full uphole stroke of 5 feet causes the sleeve to rotate in the opposite direction.

The sleeve comprises a Fill Mover Casing Bit, on the end of the outer sleeve.
Upon rotation of the sleeve, the Fill Mover Casing Bit agitates the debris forming the obstruction and keeps the debris substantially suspended in the drilling fluid for removal through the annulus between the casing and the wellbore.

Accordingly, the Fill Mover Casing Bits are made from the highest quality steel and coated with tungsten carbide to increase strength and enhance cutting ability of the bit.