The invention provides a mechanical
oil production well full-bore scale-preventing plugging tubular column tool. A
steel ball A is placed in a hole of an upper center
pipe and inserted into an annulargroove of a release, a
piston A is arranged on the upper center
pipe in a sleeved manner and fixed to the release through a
shear pin, and a
steel ball lock mechanism is constituted. An inner fishingcenter
pipe is inserted into the center pipe and fixed to the upper center pipe through a
shear pin. The maximum outer circle on the inner
fishing center pipe is in contact with the valving positionof the upper center pipe. A lock sleeve A is arranged on the center pipe A in a sleeving manner, inserted into a unblocking sleeve and fixed to the center pipe A through a
shear pin. An outer sleeve Bis arranged on the unblocking sleeve in a sleeving manner and connected to the
piston B. A bull plug is inserted into a guide head. By the adoption of the mechanical
oil production well full-bore scale-preventing plugging tubular column tool, releasing of the tool is convenient, the mechanical
oil production well full-bore scale-preventing plugging tubular column tool can smooth descend in the shell, the release is smoothly unlocked, selection of
fishing tools is more convenient and freedom; and the mechanical oil production well full-bore scale-preventing plugging tubular column tool has thefeatures of low releasing pressure and large through
diameter and guarantees the long-term effectiveness of plugging.