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Monitoring Partitioning Tracer Testing and Surfactant Flooding by In‐Line Gas Chromatography Techniques

An automated in‐line analytical system has been developed to provide near real‐time results for partitioning interwell tracer testing (PITT) and surfactant enhanced aquifer remediation (SEAR). The analytical methodology is based on gas chromatography (GC) with flame ionization detection and direct aqueous injection. The system was constructed from both commercially available and custom‐manufactured components that are linked electronically to facilitate autonomous operation. For the field trials presented herein, the in‐line GC method provided superior or comparable PITT and SEAR data compared to conventional sample collection followed by shipment and analysis at a commercial analytical laboratory. Analytical precolumns were shown to effectively safeguard the integrity of the analytical column, despite the consecutive analysis of more than 1000 samples per PITT or SEAR. Additionally, the use of the in‐line GC resulted in an 85% and 74% reduction in analytical costs per PITT and SEAR, respectively.