A MECHANISM BASED FRAMEWORK FOR SELECTING ACOUSTIC STIMULATION REGIMES IN CLOGGED URANIUM IN SITU LEACHING WELLS

Declining injectivity and productivity of uranium in situ leaching wells are mainly associated with mechanical, geochemical, and biogenic clogging of the screen and near-filter zone. This study develops a mechanism-based procedure for selecting acoustic stimulation regimes using hydraulic, hydrochemical, particle-release, and structural-safety indicators. A frequency-dependent attenuation model relates excitation frequency and formation permeability to the effective treatment radius. Published laboratory and field evidence is synthesized with poroelastic relationships to distinguish three treatment objectives: localized deposit disruption, mobilization and removal of fine particles, and formation-scale filtration activation. Ultrasonic treatment is recommended for strongly bonded deposits near the screen, low-frequency stimulation for a broader filtration response, and controlled pulsed treatment for resistant obstruction within verified structural limits. The main result is a selection matrix linking the diagnosed clogging mechanism with the preferred action, verification criterion, and operational limitation. Treatment success is defined by a sustained reduction in hydraulic resistance together with mechanism-specific hydraulic, hydrochemical, and particle-release evidence. The procedure provides a reproducible basis for planning and monitoring uranium ISL well rehabilitation.

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