As of March 2020, China Congo Wing Wah Petrochimie SA (Wing Wah) is understood to have completed drilling operations at the Ngoubili 1 exploration well within the Kayo Bloc Nord (Kayo permit, in Lower Congo Basin). The well was plugged and abandoned as dry. Wing Wah is understood to target the Barremian Mengo Sandstone Formation and Barremian to Aptian Toca Carbonate Formation as Pre-salt objectives. The planned was 2,800 m. The well appears to have been spudded in September 2019 (original planned spud date was 19 June 2019).  On 26 November 2018, the company completed a 5-well drilling programme: HOL-1, HOL-2, HOL-3, HOL-4 and HOL-5 all have been positive except for HOL-1.   Wing Wah operates the tract with an 85% interest. SNPC holds the remaining 15% carried interest as partner.
Ngoubili 1 nfw (Wing Wah 85% op, SNPC 15%) Kayo Bloc Nord (Kayo permit), onshore, P&A dry, PTD was 2800m, targets believed pre-salt Mengo + Toca Fm's. 