The invention discloses a semi-permanent mechanical throwing and
fishing soluble shaft plugging bridge plug and method, and belongs to the technical field of bridge plugs, the bridge plug comprises a throwing joint, a central
pipe, a
fishing joint, a guide cone, a slip and a setting mechanism, the central
pipe and the guide cone are provided with limiting pieces used for being matched with
axial displacement of the central
pipe, the limiting pieces are dissoluble, and the
fishing joint is connected with the slip. Through limiting cooperation, setting and unsetting of the setting mechanism are achieved; during setting, the slip fixes the bridge plug on the inner wall of the casing pipe through
inertia, the central pipe is lifted upwards to drive the
piston to extrude hydraulic oil in the rubber sleeve lower connector into the sealing rubber sleeve, so that the sealing rubber sleeve is expanded, setting is completed, and at the moment, the central pipe is meshed and fixed with the limiting piece; during unsealing, the limiting piece is dissolved, the central pipe can axially move, the sealing rubber sleeve automatically shrinks, and the bridge plug is recycled by grabbing the fishing connector; the device is simple in structure and principle, convenient to recycle, capable of saving use cost, high in plugging pressure and capable of providing help for oil and gas development and construction of oil fields.