The present invention relates to a mud bag flushing aid for a
drill bit while drilling, comprising an
upper joint and a lower joint, wherein the lower joint is telescopically sleeved on the lower part of the
upper joint, wherein the upper end of the
upper joint is connected to the
drill string by a thread, and the lower end of the lower joint is connected to the
drill bit by a thread; the upper joint is provided with a central
pipe along the axis, the central
pipe is communicated with the central hole of the drill tool and the inner hole of the
drill bit respectively, and a diversion hole is provided on the side wall of the central
pipe; a replaceable gland is installed at the lower end of the lower joint, and the gland can be provided with the same number of nozzles as the number of the
chip grooves of the
drill bit, when the diversion hole of the upper joint is communicated with the drainage hole of the lower joint, the
drill bit is cleaned from the outside, and when drilling is normal, the drainage hole and the diversion hole are closed, and the
drilling fluid completely passes through the drill bit. The beneficial effects achieved by the present invention are: when the drill bit is not subjected to drilling pressure, the
chip groove of the drill bit is flushed from top to bottom, the flushing effect is good, the mud bag is easily removed, the pure mechanical structure design has high reliability, and the filter screen plug is installed to prevent the water eye of the drill bit from being blocked.