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Scoop-Stack Playbook 2017

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SCOOP/STACK: TECHNOLOGY 28 | September 2017 | hartenergy.com process uses natural and enhanced bioremedia- tion, or good bacteria and nutrients, to separate and breakdown any existing impurities that may be contained in the produced water. The end result is a high-quality water primarily free of impuri- ties—very similar to what is initially found in the reservoir rock. An additional water pit serves as the final storage area and also contains aerators, which Newfield utilizes to maintain the quality of the water and limit bacterial growth." Newfield and its peers are also aware that certain disposal wells have been linked to seismic activity in the region. A number of the earthquakes have been traced back to injections into the Arbuckle Formation and in the watery Mississippi Lime area of the state. Oklahoma averaged almost more than five magnitude 2.7 or greater quakes per day in 2015, but the rate fell to 3.6 per day in 2016 and 1.4 per day so far this year, according to data from the Oklahoma Geological Survey. "Our operations are not located in the watery Mississippi Lime area and none of our SWD [saltwater disposal] wells are injecting into the Arbuckle," Durfey said. "We have our own injection well within our own infrastructure that we utilize, and we have a couple of third-party disposal wells, but none of them are injecting into the Arbuckle geological formation. That has been the zone of concern for seismicity activity. Right now, there seems to be enough disposal capacity from third parties and the operators that own their own, but as activity increases it could become a concern. That's another big advantage to recycling. If we can recycle and reuse what we bring out of the ground, then we don't have to worry about going to an alternative disposal solution like disposal wells." Newfield's experience with produced water recy- cling goes back to 2004. By year-end 2016 the com- pany had reused more than 150 MMbbl during operations in Utah, Texas and Oklahoma. New- field's Barton facility is Newfield's first recycling facility in the Stack play, but the company isn't rul- ing out plans for additional water recycling plants in the region. Pit construction was proceeding at Newfield's Barton water recycling facility as of mid-June 2017. (Photo courtesy of Newfield)

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