just a wee nitpick that doesn't negate your point. I think the 140 number is more than a bit high, at least for a single continuous fracturing job on a single well. 100 rail car loads of sand would be about 450 truck loads and i don't think a single well sees anywhere near that number for a continuous fracturing operation. This http://www.marcellus-shale.us/Marcellus_FRAC.htm shows what i think is a more typically sized operation. If fracturing different stages involves moving trucks in and out, then wells that are seeing multiple fracturing stages (sometimes dozens of stages) could see that many truck/rail loads of sand. I'm guessing that the latter situation is where the 100+ rail car load number comes from, however, i don't think these are typical cases.
LITTLE ROCK, Ark. -- Two natural gas companies have agreed to temporarily suspend use of injection wells in central Arkansas where earthquakes keep occurring.
Oklahoma City-based Chesapeake Energy and Clarita Operating of Little Rock told the Arkansas Oil and Gas Commission on Friday that they've stopped operation of the wells near Greenbrier and Guy pending the panel's next regular meeting on March 29.
Clarita's parent company is True Energy Services of Ada, Okla.
The commission says there is likely a link between the wells and the earthquakes. There have been more than 800 quakes in the area in the past six months and a magnitude 4.7 quake – the strongest in Arkansas in 35 years – hit there Sunday.
The high-pressure wells are used to dispose of waste water from natural gas drilling.
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