OSCILLATOR FOR DRILL STRING Russian patent published in 2015 - IPC E21B28/00 E21B4/02 E21B7/00 

FIELD: mining.

SUBSTANCE: oscillator contains the gerotor type screw hydraulic engine which comprises the stator and the rotor inside it, and the valve the elements of which interact, together forming the variable flow passage for the fluid medium through the valve. The oscillator contains the plunger module, the transmission shaft, the radial-thrust rotation support and the hydromechanical pulse generator containing the housing, the mandrel inside the housing, the elements for torque transmission between the housing and the mandrel, the spring module between the housing and the mandrel, the thrust bushing between the top thrust end face of the housing and the spring module, the ring piston with seals installed between internal surface of the housing and external surface of the mandrel, reacting to the fluid medium pressure, and also containing seals in input part between the housing and the mandrel, and the chamber for working liquid-oil limited by seals in the input part of the housing and seals of the ring piston between the housing and the mandrel, and the thrust ring installed on the internal tubular element forming the lower part of the mandrel. The rotary drive for moment transmission between the mandrel and the housing at longitudinal movement with reference to each other is fitted with the shock ring installed in the mandrel with a possibility of longitudinal movement of the mandrel with the shock ring inside the thrust bushing.

EFFECT: increase of resource and reliability of the oscillator, decrease friction of forces between the drill string and well walls, torsional tension in a drill string at directional drilling, decrease of probability of drill string sticking, possibility of application of axial load on the oscillator is provided during the operation using hydromechanical jar for release from sticking, increase of resource of bit and speed of well driving.

3 cl, 8 dwg