Chesapeake Energy has stemmed the flow of leaking drilling fluids from a natural gas well that suffered a blow-out late on Tuesday in Pennsylvania and prompted the company to suspend a controversial gas production technique in the state. Chesapeake, one of Pennsylvania’s biggest shale gas producers, used a mix of plastic, ground-up tires and heavy…

A blowout at a Pennsylvania natural gas well late Tuesday could heighten concerns about the safety of a controversial process to extract gas from shale rock. The accident comes at a sensitive time for energy drillers, exactly one year after an explosion that led to the massive BP Gulf of Mexico oil spill, and just…