The invention discloses a hydraulic retractable
fishing spear, which relates to a retractable
fishing spear and solves the problems that the conventional retractable
fishing spear cannot be applied to blockage release fishing of a continuous oil
pipe of a horizontal well and the retractable fishing spear cannot be retracted when the blockage release fails so as to cause high construction risk. The lower end inner wall of an
upper joint is connected with the upper end outer wall of a pull rod by
screw thread, a sealing
gasket is arranged between the upper end face of the pull rod and the
upper joint, the lower end outer wall of the
upper joint is connected with the upper end inner wall of a protective sleeve by
screw thread, the lower end inner wall of the protective sleeve is in sliding friction with the secondary outer shoulder side wall of a
piston, a spring is sleeved on the primary outer shoulder side wall of the
piston, the secondary inner shoulder side wall of the
piston is in sliding friction with the lower outer wall of the pull rod, the upper end outer wall of a spear rod is connected with the lower inner wall of the pull rod by
screw thread, a slip is sleeved on the spear rod, the outer wall of the slip is connected with the primary inner shoulder side wall of the piston by screw thread, the pull rod is provided with a through hole, and the inner wall of the piston is provided with an annular
rabbet. The hydraulic retractable fishing spear is applied to underground fishing operation of oil fields.