Offshore drilling companies say they are mothballing or even scrapping some of their aging drilling rigs as energy companies respond to a global glut of oil that has sent prices tumbling. The moves by the companies that lease and operate drilling rigs are among the first concrete signs that the energy industry does not think the 25% price drop since June is temporary. “We’re not seeing a lot of opportunity on the horizon right now for 2015,” said Terry Bonno, a senior vice president at Transocean Ltd., told analysts earlier this week. The company, which owns the world’s largest fleet of deepwater rigs, said it is junking some offshore rigs that are currently in storage, and writing down the value of some of its deep-water vessels. Transocean’s shares have fallen by more than 50% over the past 12 months, to $27, well under the lows they […]