DRILL STRING OSCILLATOR Russian patent published in 2023 - IPC E21B28/00 

FIELD: drilling techniques.

SUBSTANCE: drill string oscillators designed to create hydromechanical pulses acting on the drill string. The oscillator contains a generator of hydromechanical pulses containing a mandrel, elements for transmitting torque between the body of this generator and the mandrel, a spring module, a sleeve between the upper thrust end of the body and the spring module, an annular piston between the inner surface of the body and the outer surface of the mandrel, and a thrust ring mounted on in the inner tubular element constituting the lower part of the mandrel, a flow channel with a means for regulating the cross section of the transfer channel, a pressure pulse module mounted at the end of the hydromechanical pulse generator, including a valve block and a turbine block. The transfer channel cross-section control means is a movable valve element based on a fixed seat, the central holes in which, communicating with each other and with the flow channel, are located eccentrically with the possibility of changing the flow section of the flow channel when these holes are displaced relative to each other and across the vertical axis of symmetry oscillator by rotating the movable valve element relative to the seat with the help of a turbine block, in the body of which a turbine stator, a shaft with a turbine rotor are mounted, a support is mounted in the lower part of the shaft, and channels for drilling fluid exit are made. The shaft in the lower part is connected to the movable valve element.

EFFECT: increase in the specific productivity of well drilling.

2 cl, 1 dwg