The application discloses a
pressure balance ahead
coring drill tool and relates to the field of geological drilling. The
pressure balance ahead
coring drill tool comprises a one-way mechanism, the bottom of the one-way mechanism is movably connected with a two-way circulation mechanism through threads, the surface of the two-way circulation mechanism is movably connected with a
drill inner tube through threads, the bottom of the surface of the two-way circulation mechanism is movably connected with a drill outer tube through threads, the bottom of the drill inner tube is movably connected with an inner
drill bit through threads, the bottom of the drill outer tube is movably connected with an outer
drill bit through threads, the one-way mechanism comprises an
upper joint, the inner cavity of the
upper joint is provided with a
valve seat, the bottom of the surface of the
valve seat is sleeved with a first spring, and the two-way circulation mechanism comprises a double circulation joint. Through positive circulation of the gap between the inner tube and the outer tube and reverse circulation of the inner tube, the
pressure balance ahead
coring drill tool can realize optimization of a drill flow channel, pressure balance, and prevention of the situation that, in the process of brine
mineral exploration drilling, a mine layer contains ore due to serious mud making, thereby causing a drill jam and the like, so that the problems in the background art are solved.