(EnergyAsia, May 13, Tuesday) — Keppel FELS Limited, a wholly-owned subsidiary of Singapore’s Keppel Offshore & Marine Limited (Keppel O&M), said it has secured a contract to build a US$512 million ultra-deepwater semisubmersible (semi) drilling rig from a subsidiary of ENSCO International Incorporated (ENSCO). To be delivered in the second half of 2011, the ENSCO…