Oklahoma Shuts More Oil Fracking Waste Wells as Quake UpgradedBy and
Environmental agency orders suspension of another 17 sites
Move follows 37 closed by state oil and gas regulators
Oklahoma drillers are being ordered to shut more fracking wastewater wells just as the U.S. Geological Survey is upgrading last weekend’s earthquake to a record magnitude.
The Environmental Protection Agency said Wednesday it has ordered the closure of 17 additional disposal sites under its jurisdiction in Osage County. The move follows the suspension of 37 wells by the Oklahoma Corporation Commission and comes on the same day the USGS upgraded the tremor to 5.8 in magnitude, the highest ever for the state, from 5.6 previously estimated.
Oklahoma regulators had already been limiting the disposal of oilfield wastewater, which scientists have linked to seismic activity, before the tremor that was felt from Texas to Illinois on Saturday. The number of earthquakes measuring 3.0 or higher reached at least 890 last year, up from just two in 2008, before the state’s fracking boom started. The USGS has not determined an official cause for the earthquake.
“At this point, we don’t want to attribute it specifically to any phenomena,” George Choy, seismologist at the U.S. Geological Survey, said Wednesday in a phone interview. “We need to get more data to make sure everything is lined up before we say anything definitive.”
Fracked wells produce large quantities of wastewater, which drilling companies inject into ultra-deep disposal wells. The Oklahoma Corporation Commission, which regulates oil and gas activity in the state, has been issuing restrictions for more than a year aimed at cutting down on the amount of wastewater injected into disposal wells. The measures may raise costs for drillers.
“In $45 oil, every little bit of cost increase makes a difference,” Chad Warmington, President of the Oklahoma Oil & Gas Association, said Wednesday in an e-mail. “It becomes prohibitively more expensive when you have to truck water for any significant distance versus disposal on the site of your oil and gas production.”
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