Royal Dutch Shell Plc said more than 20 percent of about 800 union workers at its Deer Park refinery in Texas have crossed picket lines, undermining a strike that has entered its second month. Workers also have begun returning to their jobs at refineries owned by Motiva Enterprises LLC, a joint venture between Shell and Saudi Arabian Oil Co., said Kelly Op De Weegh, a Motiva spokeswoman. LyondellBasell Industries NV and Tesoro Corp., two other refinery owners affected by the strike, are seeing a growing number of employees coming back to work, according to spokespersons for the companies who wouldn’t provide a specific estimate. “We have had workers return at all three of our sites,” said Destin Singleton, a spokeswoman for Tesoro Corp. The Steelworkers said only a small fraction of the 6,600 workers joining the strike since Feb. 1 have been crossing the picket lines. The […]