FLUID PULSE APPARATUS Russian patent published in 2018 - IPC E21B7/24 E21B28/00 E21B4/02 E21B4/16 

FIELD: drilling of soil or rock.

SUBSTANCE: fluid pulse apparatus for downhole drilling comprises a housing defining a fluid flow passage for a flow of drilling fluid from an upstream end towards a downstream end, a turbine assembly within the fluid flow passage and having an upstream annular cam surface and a downstream annular cam surface, at least one turbine member that is operatively connected to the upstream annular cam surface and the downstream annular cam surface and is actuated by the flow of drilling fluid so as to cause rotation of the turbine assembly, and a piston fixed to the upstream annular cam surface, wherein the fluid flow passage has a narrowed part upstream of the turbine assembly such that the piston is receivable within the narrowed part of the fluid flow passage, at least one upstream cam follower fixed to the housing for cooperation with the upstream annular cam surface, and at least one downstream cam follower fixed to the housing for cooperation with the downstream annular cam surface. When the turbine assembly is caused to rotate, there is a cam action between the upstream cam follower(s) and the upstream annular cam surface and between the downstream cam follower(s) and the downstream annular cam surface that causes the turbine assembly to reciprocate axially within the fluid flow passage such that the piston moves axially between a flow restricting position within the narrowed part of the fluid flow passage and an open position to effect periodic restriction of the flow of drilling fluid through the fluid flow passage.

EFFECT: improved efficiency of the drilling process and the reliability of the device.

22 cl, 11 dwg