US energy company ExxonMobil has started drilling one of two new exploration wells offshore Guyana. It’s the first of two wells to be drilled this month. The world’s largest publicly traded international oil and gas company said in a statement that the Stena Carron drillship is drilling the Haimara-1 well, located 19 miles east of the Pluma-1 discovery in the southeast Stabroek Block.