TURBINE DRIVE OF THE SHOE-BIT FOR DRILLING A COMPLICATED SECTION OF THE WELL Russian patent published in 2022 - IPC E21B4/02 E21B17/14 

FIELD: oil and gas wells construction.

SUBSTANCE: invention relates to devices for the construction of oil and gas wells, in particular for drilling complicated sections of wells. The turbine drive comprises a tubular fixed body with centering elements located on it, a drive assembly with a shaft located inside the casing, a turbine connected to the drive assembly and a bit shoe having a plurality of channels, and means for supplying cement slurry to the well cementing zone. Parts of the drive unit and the shoe-chisel are made of an easily drillable material, the drive unit shaft is made of a tubular upper part and a tubular lower part, the shaft parts are connected by a sleeve hollow from the inside with radial holes in it, the turbine is located on the upper part of the shaft between the wall of this part of the shaft and the tubular body. The top of the shaft is equipped with a bursting disc nut located above the end of the top of the shaft. On the outer surface of the upper part of the shaft, there are longitudinal grooves, on the inner surface of the turbine rotor there are protrusions located in the grooves of the upper part of the shaft. Inside the lower tubular part of the shaft, a thread is made for screwing a shoe-chisel into it. The easily drillable material is used to make parts of the drive unit such as the tubular top of the shaft, the nut and the turbine. The means for supplying cement slurry to the well cementing zone are the nut hole closed from above by a bursting disc, the cavity of the tubular upper part of the shaft and the radial holes in the sleeve connecting the shaft parts.

EFFECT: exclusion of reactive torque transmitted to the casing string, as well as reduction of well construction time when drilling complicated well sections.

3 cl, 4 dwg