LONDON (Dow Jones)--Serica Energy (SQZ.LN), said Monday that drilling operations commenced at the Oates exploration well location in Block 22/19c in the U.K. Central North Sea on July 30, and said the well will be drilled by the Ensco 100 jack-up drilling rig to a depth of 10,000 feet. MAIN FACTS: -It is anticipated to take 30 days to drill. -Serica has a 50% interest in the well. -Shares closed Friday at 71.50 pence. -By Razak Musah Baba, Dow Jones Newswires; 44-20-7842-9275; [email protected] (END) Dow Jones Newswires August 02, 2010 02:31 ET (06:31 GMT)