Technology Evaluation Report: Site Program Demonstration Test. Accutech PneumaticFracturing Extraction and Hot Gas Injection, Phase 1. Volume 1

摘要

The Pneumatic Fracturing Extraction (PFE) process developed by Accutech RemedialSystems, Inc. makes it possible to use vapor extraction to remove volatile organics at increased rates from a broader range of vadose zones. The low permeability of silts, clays, shales, etc. would otherwise make such formations unsuitable for cost-effective vapor extraction and require more costly approaches. Pneumatic fracturing provides an innovative means of increasing the permeability of a formation and thus extending the radius of influence so that contaminants can be effectively extracted. In the PFE process, fracture wells are drilled in the contaminated vadose zone and left open bore (uncased) for most of their depth. A packer system is used to isolate small (2 ft) intervals so that