Exxon Mobil yesterday said that the development drilling for its three offshore Guyana projects has begun. The developments, which could produce more than 500,000 bpd, are likely to start producing oil from 2020. The project would see the conversion of an oil tanker into a floating, production, storage and offload (FPSO) vessel, with a production capacity of 120,000 bpd, while a second FPSO of 220,000 bpd capacity is under planning.