The well is being drilled by the drillship "Jack Ryan" in around 820m water depth offshore Mauritania in PSC Area B, 90km from the capital city of Nouakchott.

Operator Woodside had previously signed a contract with Smedvig Offshore AS for the drillship West Navigator to drill up to four wells in offshore Mauritania during 2003. However, the West Navigator is working in the North Sea, and has possibly been delayed from completing its work contract, thereby delaying its arrival in Mauritania.

To avoid any further delay to the drilling schedule it was decided to contract another drillship for the first well in the program. A decision will be made at a later date on whether to use the Jack Ryan drillship for the three planned exploration wells or accept the West Navigator drillship for this work when it becomes available.

Participants in the Chinguetti 4-5 well and PSC Area B are Woodside Mauritania (operator) 35.0%, AGIP Mauritania BV 35.0%, Hardman Resources Ltd 21.6%, Fusion Oil and Gas NL 6.0%, Roc Oil (Mauritania) Company 2.4%.