US Patent 7757754 Combination motor casing and spear

A wellhead removal tool features a rotary cutter run by a Moyno type progressive cavity pump that is powered by fluid pumped through it. The stator of the motor has a gripping device with a series of collets or slip inserts that have grip features that face outwardly. A support shoulder on the grip assembly cooperates with a j-slot connection to the stator to allow a cone to be moved under the collets to push them into a grip position below or in a selected portion of the wellhead where the grip will not damage the wellhead internal components. Fluid pumped through the downhole motor causes the casing cutter blades to extend and rotate to cut the casing.