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California is shutting down another 33 oilfield wells that state officials improperly permitted to inject into federally protected water supplies.
The approval means Shell has just four remaining federal permits that are essential for it to resume drilling in the Chukchi Sea this summer.
A top California oil and gas regulator has resigned amid questions about oilfield contamination of the state’s water supplies, officials confirmed Friday.
Industry leaders celebrated the report’s release as a vindication of the hydraulic fracturing process that has unlocked oil and gas nationwide, driving a domestic energy boom.
Shale wells require millions of gallons of water. Hydraulic fracturing pumps water, chemicals and sand at high pressure to crack shale, allowing oil and gas to flow up a well.
An Associated Press analysis found hundreds of the now-challenged state permits for oil-field injection into protected aquifers have been granted since 2011.
Hydraulic fracturing in shale for oil and gas should be put on hold in the U.K. because of risks to public health and the environment, a panel of lawmakers said.
Oil companies don’t have the best reputations in the communities where they drill, and can be seen as threats to local water supplies.
The University of Texas at San Antonio and the Southwest Research Institute say they have found an inexpensive way to treat the water that flows back to the surface after hydraulic fracturing. A team of researchers used a plant matter called biochar to remove impurities from the flowback water.
According to the analysis by the World Resources Institute, 38 percent of the earth’s shale gas and tight oil resources are in areas that are either arid or under high levels of water stress already _ a scenario that does not mesh with the high water demands of today’s extraction techniques.