• Successful drilling, completion, and production start of WZ12-8 A9H infill well
• Well intersects oil in both U4 and shallower U1 reservoirs
• Initial production testing the new U1 reservoir at 372 bopd gross (100 bopd net)

Horizon Oil Limited has announced the successful drilling, completion, and commencement of production from the A9H infill well in the WZ12-8 Mid field in Block 22/12, Beibu Gulf, People's Republic of China. The well was drilled using the last slot on the WZ12-8W wellhead platform, targeting unswept oil in the WZ12-8 Mid field. The well drilled 159mMD of horizontal oil in the primary U4 target that is being produced by the existing A6H and A8H wells, and also intersected 19mMD of oil in the shallower U1 reservoir that was not expected and has not been previously produced. A9H was completed with an Electric Submersible Pump and downhole equipment to allow production from both reservoirs. Initial production is testing the new U1 reservoir and was flowing at 372 bopd gross (Horizon net 100 bopd) on 8 June. The bottomhole flowing pressure from this U1 reservoir is a high 893 psi which, depending on water-cut development, might allow an increase in oil rate. The U4 will commence production after this initial testing of the U1 is complete. Horizon will book reserves as at 30 June 2025 consistent with Horizon's pre-drill estimate of 0.4 mmbbl gross (Horizon net 0.1 mmbbl).

Horizon will book reserves as at 30 June 2025 consistent with Horizon's pre-drill estimate of 0.4 mmbbl gross (Horizon net 0.1 mmbbl).