Patent attributes
A wellbore cementing tool configured for placement in a wellbore or in a drill string, and method of using same. The tool comprises a body having upper and lower members connected by a shear component. A rod is connected to the upper member, and the tool can be lowered with the rod into the wellbore or drill string to a desired depth. At the desired depth, locking means are deployed to lock the tool in position, the tool is sealed, and cement can be injected through the tool to the annulus of the outer casing. In some embodiments the tool is locked using a pushing motion that extends locking members outwardly from the tool to engage the wellbore walls or the inner surfaces of the drill string. Once cementing is completed, the rod is pulled from surface thereby causing the shear component to rupture and the upper and lower members to disconnect, and the upper member can be drawn to surface leaving the rest of the tool downhole. The tool does not require rotation to recover the rod, hence reducing the risk of loosening the threaded connections of lengths of drill pipe.
