Oil prices flip-flopped Thursday as fears of lingering oversupply held back a bullish push from technical traders, brokers said. Automated systems and traders who move based on price-chart patterns had sent the market higher Thursday, turning bullish after a surge on Wednesday led to a two-week high settlement, the brokers added. That run got a further push from data provider Genscape Inc., which reported Thursday morning that stockpiles have continued to fall at Cushing, Okla., the delivery point for the benchmark U.S. futures contract, according a person who had reviewed the report. But prices have retreated in the late morning. Many brokers and analysts have warned that there are few reasons to believe the market is coming back into balance. The rally was triggered in part by approval of oil swaps between the U.S. and Mexico and by other signs of drawdowns at Cushing, but those events have limited […]