Annular Jet Pump for Downhole Cavitation Control

The patent transitions from a conventional single-nozzle configuration to an annular nozzle design where power fluid flows through a ring-shaped channel surrounding the production fluid. This dimensional change creates a three-dimensional contact interface between the two fluids, dramatically increasing the surface area of contact and thereby enhancing momentum transfer efficiency from the power fluid to the production fluid.

The patent employs a nested configuration where the production fluid flows through a central channel that is surrounded by the annular power fluid channel. This nesting arrangement allows both fluids to flow concurrently in concentric paths, maximizing their contact surface area while maintaining a compact pump structure, thus resolving the contradiction between structural simplicity and enhanced fluid interaction.

The patent introduces a buffer zone of power fluid that acts as an intermediary between the high-velocity jet and the pump's inner walls (throat and diffuser). This buffer layer absorbs and dissipates the cavitation energy before it can reach and damage the equipment surfaces, thereby protecting the pump while the annular configuration manages the complexity through systematic design.

The patent divides the nozzle into multiple functional zones: a central production fluid channel, an annular power fluid channel, and a buffer zone. This segmentation allows each zone to perform its specific function - the power fluid channel generates momentum, the production fluid channel transports fluid, and the buffer zone prevents cavitation damage - thereby achieving reliability through structured complexity.

The annular nozzle configuration serves multiple functions simultaneously: it increases the surface area of contact between power and production fluids for enhanced momentum transfer, creates a buffer zone for cavitation protection, and maintains a relatively compact structure. This multi-functionality achieves high operational efficiency without proportionally increasing device complexity, as a single annular structure accomplishes multiple objectives.

The patent merges the functions of increasing fluid contact area and cavitation protection into a single annular nozzle design. Rather than adding separate components for each function, the annular configuration combines both benefits in one integrated structure, thereby enhancing operational efficiency while minimizing the increase in device complexity.