As energy companies drill fewer wells, some small firms that frack wells face bankruptcy. A wave of bankruptcies and closures is sweeping across the oil patch, with dozens of hydraulic-fracturing companies at risk, industry experts say. Most of the companies that help oil-and-gas explorers drill and frack wells are small, privately owned and just a few years old. They are part of a flood of new entrants in the energy business—one that is drying up as oil prices languish below $50 a barrel. One of the latest casualties is Pro-Stim Services. Launched in 2011 with backing from Turnbridge Capital LLC, a private-equity firm, the company did work for oil-and-gas producers eager to coax more fuel out of the ground in places like Texas and Louisiana. “The Haynesville Shale was blowing and going at that time,” said Bubba Brooks, who founded the company in Longview, Texas, after working in the […]