The location is between the Horndean and Singleton producing oil fields in south-east UK and is assessed to be an extension of the former.
The final measured depth will be 6009ft at a true vertical depth of 4528ft.
The well will test a target with a mean potential independently assessed at 35 million barrels of oil in place, with an upside potential of 61.4 million barrels with a 10% probability.
Northern Petroleum (GB) has a 50% interest in the Markwells Wood well while Magellan Petroleum (UK) and Egdon Resources UK have 40% and 10% interests in the license, respectively.
Northern Petroleum has exploration, development and production assets in the Netherlands, Italy, UK and Guyana.
