Horizon Oil Limited announced the commencement of workover and drilling operations in the WZ6-12 area of Block 22/12, Beibu Gulf, People's Republic of China. The COSL owned Strike drilling rig has been mobilised to the WZ6-12 wellhead platform following completion of the WZ12-8E drilling programme. The WZ6-12 programme comprises: five well workover programme designed to reinstate /enhance production from existing WZ6-12 wells; the WZ6-12 M3 appraisal well targeting an undrilled fault block of Weizhou reservoir sands located adjacent to the producing WZ6-12 M1 and WZ6-12 South fault blocks.

In addition, the Joint Venture is considering adding a WZ6-12 North field development infill well to the end of the programme. A final decision on this opportunity will be made in the coming weeks. CNOOC is operating the workover and WZ6-12 M3 drilling programme, which is expected to conclude around the end of September.