Multifunctional casing running and grouting device for well drilling

The utility model discloses a multifunctional casing running and grouting device for well drilling. The multifunctional casing running and grouting device for well drilling comprises an outer barrel (1) and an inner barrel (2) movably arranged in the outer barrel. The lower end of the inner barrel extends out from the lower end of the outer barrel, and a sealing ring (7) is arranged between the inner wall of the lower end of the outer barrel and the outer wall of the inner barrel; an axial sliding groove (3) and at least two guide grooves (4) are formed in the inner wall in the middle section of the outer barrel, the guide grooves are distributed at intervals in the axial direction of the outer barrel and perpendicular to the axial sliding groove, a locating groove (5) extending downwards in the axial direction of the outer barrel is arranged at one end, far from the axial sliding groove, of each guide groove, and the axial sliding groove, the guide grooves and the locating grooves are communicated mutually; and sliders (6) capable of sliding in the axial sliding groove, the guide grooves and the locating grooves are arranged on the outer wall of the inner barrel (2). By means of the multifunctional casing running and grouting device for well drilling, blocking risks of underground casings can be reduced, and success rates of in-place casing running of large-displacement well long open hole sections can be improved.