LD 4-3-1 was completed in mid-September 2018 without result reported.   CNOOC â Tianjin spudded new field wildcat LD 4-3-1 in the Bohai offshore on 8 August 2018. The well is located in the Liaodong Bay of the Bohai Gulf Basin at a water depth of around 30 m. The well is targeting the Tertiary sands play. âBohai 7â J/U is used for the drilling operation.  Liaodong Bay is part of Bohai offshore, next to Liaohe Depression onshore in the north and Bozhong Depression offshore in the south. CNOOC has found more than 10 fields in this area, including the second largest field in Bohai offshore - Suizhong 36-1. The existing fields have main reservoirs in the Tertiary sandstones with a few ones in the pre-Tertiary Basement.  Background information    In 2014, CNOOC drilled the Luda 16-3S-1 discovery which encountered oil and gas pay zones with a total thickness of 127 m. In 2015, the company drilled four successful appraisal wells to assess this discovery. The field is still under appraisal due to uneconomic size.  In 2013, Luda 5-2N discovery was confirmed when Luda 5-2N-2 and Luda 5-2N-4 penetrated oil pay zones and tested oil flow from the Oligocene Dongying Formation. In June 2014, the Luda 5-2N field was reported that it had a proven oil in place of 58 MMt (424 MMbbl).  In 2006, Luda 6-2 field was discovered with Luda 6-2-1 which tested 620 b/d of oil and 240 Mcf/d of gas from the Dongying Formation. In 2012, the company drilled two appraisal wells, Luda 6-2-4 and Luda 6-2-5, which penetrated 40 m and 147.6 m pay zones respectively. Average oil test rate of 850 b/d was also recorded.   In 2002, CNOOC discovered Luda 4-2 and Luda 10-1 fields in this area. In 2004, the Overall Development Plan for the two fields plus Luda 5-2 was approved. In 2005, Luda 4-2, 10-1 and 5-2 fields were put onstream. Luda 10-1, 5-2 and 4-2 fields are estimated to have more than 230 MMbbl of proven recoverable oil as of 2015.  In 1986, CNOOC discovered the Suizhong 36-1 field. Production from the field started in 1993, with 10,700 bo/d coming from the Lower Dongying Member. By-end 2016 a total of 544 MMbbl of oil and 57.5 Bcf of gas have been produced from the field.
China CNOOC Tianjin - LD 4-3-1 - Completed without result reported - Bohai Gulf Basin