Vietsovpetro (VSP) has plugged and abandoned deeper pool wildcat 12/11-EF 1X (EF 1X) in Block 12/11, offshore Nam Con Son Basin, in late August 2017. The well tested 2.6 MMcfg/d from the Upper Oligocene Cau sandstone objective. EF 1X was spudded in mid-March 2017 and was drilled to a TD of 4,748 m using the âMurmanskayaâ J/U. EF 1X tested the middle section of the Hai Au structure.Â Discovery well 12W-HA 1X (Hai Au 1X) is located northeast of EF 1X. It was drilled in 1996 by operator Canadian Petroleum Vietnam to a TD of 4,443 m using the âDoo Sungâ J/U. The well flowed 24 MMcfg/d gas and 840 bc/d at a depth of 3,300 to 3,350 m in the Lower Miocene Dua Formation. DST test at the Cau Formation (at 3,925 to 3,955 m) did not flow. EF 1X is the second of a two-well campaign in the block. Thien Nga 3X (12/11-TN 3X), the first well in the campaign, was spudded on or around 20 August 2016 and was drilled to a TD of 5,510 m using the âMurmanskayaâ J/U. The well tested more than 35 MMcfg/d from the Oligocene Cau Formation. Vietsovpetro is operator of Block 12/11 with a 100% interest. Vietsovpetro is a joint venture between PetroVietnam (51%) and Zarubezhneft (49%). 
Vietnam (Nam Con Son B.) 12/11-EF 1X op. by ZARUBEZ N (60.0%, VIETSOV 0.0%, SOVICO HLD 40.0%) in Block 12/11