Hydraulic pulse generator integrated into a downhole motor

A hydraulic pulse generator integrated into a downhole motor, comprising a unified tubular body, a power section with a positive displacement Moineau-type hydraulic motor, a bearing section, and a pulse-generating section arranged coaxially and upstream of the power section, all interconnected by a flexible shaft, in which the concentric, face-to-face arrangement of a rotary valve and a stationary valve, driven directly by the flexible shaft, produces a variable fluid passage, thereby generating hydraulic pulses,

• wherein the pulse-generating section comprises a stationary valve housed within an upper carrier, facing a rotary valve mounted concentrically and fixedly in a lower carrier, the rotary valve being located downstream of the stationary valve,
• wherein the rotary valve is directly connected to the flexible shaft through an intermediate adapter, such that the valves remain face-to-face and rotate concentrically relative to each other, being driven by the flexible shaft without interposition of intermediate moving elements, forming a coaxial, compact, and structurally integrated assembly, and
• wherein the rotary valve includes a set of through-holes of circular section distributed radially around a central bore, while the stationary valve comprises a through-opening of polygonal contour open to its periphery and a central bore aligned with the central bore of the rotary valve, the valves being planar elements arranged in direct axial contact with each other, with their through-holes oriented axially through a thickness of each valve, such that flow modulation is performed exclusively by axial overlap of openings through a planar interface, active surfaces of both valves being maintained without relative eccentric movement thanks to flexibility of the shaft and bearing section, without incorporating external parallel flow paths or additional vortex chambers.