Enhancement of technological well productivity during in situ leaching using optimized multi-strand detonation cord charges (12–20 g/m): experimental study

Abstract The productivity decline of technological wells during in situ leaching (ISL) is primarily associated with clogging of well filters and the near-filter zone, leading to a significant increase in hydraulic resistance and reduction in injectivity. Field observations indicate that injectivity loss in ISL wells can reach 30–70% after 2–3 years of operation. This paper presents an experimental study on restoring well productivity using explosive declogging with optimized multi-strand detonation cord charges. The method was tested on 6 technological wells under field conditions, combined with controlled polygon experiments. The study examined detonation cords with a linear explosive density of 12–20 g/m (PETN core) in configurations of 1 to 4 strands. A configuration of two parallel strands (≈ 15 g/m each) was identified as optimal, providing efficient disruption of clogging deposits while preserving the structural integrity of the filter.