CONROE, Texas (AP) — A series of explosions rocked an oil filed chemical supply company north of Houston on Friday, setting off a fire that sent a broad, dense column of thick, black smoke towering into the otherwise blue skies. DrillChem said no one was in the plant on the eastern fringe of Conroe, about 40 miles north of Houston, at the time of the explosions.Read more on NewsOK.com