Closing 9 oil and gas wastewater wells to mitigate earthquake risks

The state shuts down oil and gas wastewater wells.

These wells remove this water from the groundwater. The Oklahoma Corporation Commission said oil and gas wastewater wells can cause seismic activity. They said they closed nine wells as a precaution while scientists figure out the cause. “The closures are indefinite,” said Matt Skinner, an OCC spokesman.

Skinner said the state acted because these nine wells are located 10 miles from the epicenter of Friday night's 5.1-magnitude earthquake. These wells dispose of wastewater resulting from oil and gas and pump this wastewater deep into the ground. “It's something that needs to be handled very carefully,” Skinner said.

This water carries toxic chlorides, Skinner said. “This is salt water that comes out with such high concentrations of chloride that it kills grass on contact,” Skinner said. “The whole idea of ​​getting rid of oil and gas wastewater is to put it somewhere it can't pose a threat to our drinking water.”

However, in 2011, the state experienced an increase in earthquake activity. Researchers have discovered that these disposal practices can produce earthquakes. “We have taken action in terms of volume reduction and well closures,” Skinner said. “We're not interested in the cause as much as we are in the risk analysis.”

Scientists still don't know what caused Friday's quake, but they want to reduce the likelihood of another tremor in Oklahoma. Limiting wastewater well activity has helped in the past, Skinner said. “We've been able to see the rate of earthquakes — magnitude 4.0 and above — decrease by ninety-eight percent since its peak in 2015,” Skinner said.

The procedure for shutting in wells is the starting point. Skinner said more decisions may be made to reduce risks as the state learns more about this earthquake.

The 4.4 magnitude earthquake occurred near Arcadia last month near a fault line. Officials said these fault lines are active.

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