The RIGGER ENGINEERING kelly bar is used with the mechanical releasing assembly (pictured above made up onto the kelly) and has a square profile. The square passes through a matching square in the releasing assembly and allows for approximately 30″ of stroke. The thead on top of the kelly is typically a box to mate with the drill pipe. The bottom collar unscrews from the kelly bar via an acme thread to allow the releasing assembly to be installed. The thread looking down from the bottom of the kelly bar collar is designed to attach to various accessories used in cementing operations.

The operation of the mechanical kelly bar is simple. The releasing assembly slides onto the kelly bar and the bottom collar is made up tight. The unit is screwed into the liner hanger which, in turn, is made up to the liner. The liner is then lowered into the well via the drill pipe. The liner sits on the bottom of the well taking the weight off of the releasing tool. When the weight of the liner is removed from the releasing assembly, via the kelly stroke, the kelly is rotated six turns to the right. This releases the slips and allows them to engage the casing. The liner is then lifted up to hanging depth. The hanger is then allowed to take the weight of the liner, again via kelly stroke. Finally, the kelly is rotated an additional 10 – 12 turns to the right to completly disengage from the liner hanger. The setting tool can now be raised an additional few feet above the hanger prior to cementing or, if installing a slotted liner, it can be removed from the well completely. To hang the liner mechanically without setting it on bottom see OFF BOTTOM TOOL. Also see releasing assembly for additional information.

Highlights