Associated Press: In the chaotic days after the oil rig explosion, BP engineers and federal regulators desperate to plug the blown-out well scrambled to complete plans for a pair of deepwater relief wells that represent the best chance to end the disastrous spill in the Gulf of Mexico. But BP didn’t begin drilling the relief well until 12 days after the start of the disaster as the company and government rushed through environmental reviews, permits and other plans. The government does not require oil …