AL003 – Pneumatic Fracturing
Field Application – Northern Alabama
Figure 1: Monitoring Air Flow Rate in a Soil Vapor Extraction (SVE) System
A Pneumatic Fracturing (PF) field application was conducted at an asphalt parking area facility in Alabama. The purpose of this operation was to evaluate the effectiveness of the technology, which would in turn increase the permeability of the tight clay soils at the site.
ARS was tasked to evaluate the performance of the technology in a “clean,” or uncontaminated area of the site. Two PF injection wells were fractured from 15-20 ft. bgs. Prior to and after fracturing, soil permeability was measured using extracted air (vacuum influence) and injected air with tracer (pressure influence). Prior to the fracturing, an effective radius of influence less than 5 ft. was measured, with pre-fracture permeability calculated to be 7.96 x 10-10 cm2. After fracturing, the effective radius of influence was observed at 29 ft. and post-fracture permeability was calculated to be 1.04 x 10-8cm2.
Vacuum Influence Testing Pre and Post-Fracture
Figure 2: Alabama (Clay) Interval: 15-20 ft. bgs (90” H0 vacuum)