| 摘要 |
The invention relates to branch of well drilling, in particular to technical means for drilling underwater wells at shelves, and can be used for sampling soils in soft non-rock bottom deposits. Hydro-hammer drilling assembly includes hydro-hammer with inlet channel and channel for discharge of liquid, rotatable drill pipe with core lifter, upper distribution unit installed over hydro-hammer and connected to pressure source, this consists of distribution adapter in chamber of which piston is installed with axial channel and seat for start valve, at that the chamber is connected to inlet channel of hydro-hammer with supercharge channel closed with piston and between the chamber and the environment throttle channels are placed, at least one of those is connected to inlet channel of hydro-hammer, and lower distribution unit that consists of blocking valve and ring slide installed between hydro-hammer and rotatable and connected to the upper distribution unit, with channel for discharge of liquid from hydro-hammer in which back valve is installed, with well and cavity of core lifter; cavity of chamber under the piston of the upper distribution unit is connected to inlet channel of hydro-hammer, in channel between the upper and the lower distribution unit throttle bushing is installed, and supercharge channel between the chamber and the inlet channel of hydro-hammer is closed with back valve. Use of the invention proposed makes it possible to achieve increase of well drilling rate without core sampling, mostly at drilling in strong clay soils, due to additional mechanical detachment of rocks at well bottom zone with hydro-hammer. |
