A Novel DNA Nanoparticle Tracer Technology in Diverter Applications for Optimizing Acid Stimulation Treatments

Accurate diagnostics of acid placement and zonal contribution remain a key challenge in the effective restimulation of legacy horizontal wells. Traditional evaluation tools—including radioactive tracers, ionic markers, and post-treatment production surveys—often lack the spatial resolution, durability, or real-time feedback needed for confident treatment optimization. This study introduces a next-generation system composed of silica-encapsulated DNA nanoparticle tracers embedded in degradable diverters to enable high-resolution, stage-specific tracking of fluid movement during matrix acidizing treatments. Field trials were conducted across four horizontal wells in the Midland Permian Basin, each exhibiting declining productivity and targeted for lateral acid remediation. The DNA tracers, uniquely barcoded and thermochemically stable, were deployed embedded in diverters at each stage and recovered via magnetic separation and quantitative PCR (qPCR). Tracer returns provided real-time insight into acid placement and zonal response. In wells with broadly distributed tracer profiles, stimulation coverage was widespread, whereas other wells showed concentrated returns from just a few zones—highlighting variability driven by formation heterogeneity and completion design. Compared to conventional tracer systems, the DNA platform enabled multiplexed deployment, sub-PPB detection sensitivity, and temporally resolved diagnostics—without the need for post-job intervention. These capabilities directly addressed prior limitations in diversion validation and stimulation evaluation. The results confirm that DNA nanoparticle tracers provide a reliable and scalable diagnostic tool, offering operators clearer visibility into stage-level behavior and supporting improved decision-making in lateral restimulation strategies.