Oil spill update: ~700 barrels of crude leaked from a Shell (NYSE:RDS.A) pipeline near Houston, with ~50 barrels spilled into the Vince Bayou that connects to the Houston Ship Channel. Crews have recovered ~19K barrels from Exxon's (NYSE:XOM) pipeline spill in Arkansas. Spill estimates from the derailment of a Canadian Pacifc (NYSE:CP) train in Ontario balloon from four barrels to 400.