The invention relates to the technical field of oil and gas field
coiled tubing working and well repairing, in particular to a
coiled tubing hydraulic double-way
jar which comprises an upper connector, an upper cylinder sleeve, an O-shaped sealing ring, a sealing ring back ring, a sealing ring, a sand-prevention blocking ring, an
impact tube nut, hydraulic oil, an
impact tube, an O-shaped sealing ring blocking ring, an upper
piston, a middle connector, a lower
piston, a sand-prevention blocking ring, a locking nut, a lower cylinder sleeve, a spline lower connector and a spline sleeve. During
coiled tubing drilling and
grinding, due to various reasons such as complex geologic structures, improper technical measures, mud, tubular columns and well holes, accidents of drilling tool blocking often happen. During drilling tool blocking, upward or downward strong
impact force is applied to a blocking point through the
jar, so that the blocking point is loosened, and accordingly the purpose of quick unblocking is achieved. The
jar can be widely used in well repairing working such as coiled tubing salving, and salving working is reliable and quick.