Another well blow-out during hydraulic fracturing

I've blogged before about well blow-outs during hydraulic fracturing in North Dakota and Pennsylvania. Last week there was another blow-out during a hydraulic fracturing operation in a Pennsylvania state forest. Talisman Energy said it was shutting down all of its hydraulic fracturing operations in North America while investigating the cause of this incident. It was reported that 21,000 gallons of frack fluid blew into the air.