Pinnergy Ltd. will begin development on a wastewater disposal well in the Eagle Ford Shale in the next 60 days, the Austin-based oilfield services firm's top officer says. The company has a permit to put the deep injection well around five miles east of the town of Cotulla, located in one of the busiest drilling areas in the South Texas oil-and-gas play, CEO Randy Taylor says. Such wells are state-approved sites for disposal of so-called "flowback water" from the hydraulic fracturing, or fracking,…