EP 21-3-1 was completed in late September 2019 without result reported.  CNOOC â Shenzhen spudded a new-field wildcat EP 21-3-1 in the PRMB Basin on 9 August 2019. The well, located in the Enping Sag, is situated at a water depth of approximately 100 m area and is targeting the Mio-Oligocene clastic play. âHYSY 943â J/U is used for the drilling operation.   In 2019, CNOOC has drilled a number of wells in the Enping Sag, such as EP 20-1-1, EP 20-2-1, EP 20-5-1, EP 10-6-1, EP 20-7-1 and EP 21-2-1d, all with result unreported.   In November 2018, CNOOC completed EP 20-4-1 with oil in this area. In January 2019 an appraisal well, EP 20-4-2, was completed with success.   In February and March 2018, CNOOC completed EP 15-2-1 and EP 10-2-1, in the Enping Sag with both penetrating oil-bearing zones. The EP 10-2-1 and EP 15-2-1 discoveries, together with existing EP 15-1 discovery, are expected to be a medium size cluster/joint development.   EP 15-1 discovery was made in 2016 in the Enping Sag.   Background Information    In the past few years, 10 discoveries have been made in the Enping Sag, the most significant ones are EP 24-2, EP 18-1 and EP 23-1 fields cluster, with reservoirs from Miocene to Oligocene sands.   The Miocene to Oligocene reservoirs are the most significant reservoirs in the PRMB, mainly predominated by sandstones and carbonates of the Lower Miocene Zhujiang Formation, sandstones of the Middle Miocene Hanjiang Formation, and sandstones of the Upper Oligocene Zhuhai Formation. These sandstones were mainly deposited as massive fluvial sands and as deltaic channel and tidal bars with good reservoir properties.  To date, five fields have been brought onstream successively since 2014. The latest onstream field in the area is EP 23-1 fields cluster (together with EP 23-2 and EP 23-7), which started commercial production in November 2016 with initial flowing 5,597 bo/d from three wells. The cluster together with Enping 18-1 (on stream Sep 2016) were tied-into the Enping 24-2 facilities, the latter on stream in 2014.   By December 2017, the EP 23-1 alone has cumulative production of 4.80 MMbbl, EP 23-2 alone has 1.20 MMbbl and EP23-7 alone has 0.9 MMbbl.   EP 18-1 was discovered by BP Group with well Enping 18-1-1A in 1984. The field was further confirmed as a discovery after CNOOC obtained success from its first well Enping 18-1-2D in early 2012. The EP 18-1 was brought on stream in September 2016 with initial production at 2,010 bo/d from three well. By December 2017, the field has cumulative production of 1.76 MMbbl.  EP 24-2 field was discovered in August 2010, and on stream in October 2014 with Initial production at 8,000 bo/d from two wells. By December 2017, the field has cumulative production of 36.6 MMbbl
EP 21-3-1 was completed in late September 2019 without result reported.