The Okwok-9 well was spudded in August 2010 and reached a total measured depth of 8,083ft.
The well was completed over a 35ft interval of good quality D2 reservoir (average porosity 30%) and flowed 31 degrees API crude oil.
The well was flowed for 48 hours and shut in for a 54-hour build-up, and the final build-up pressure was equal to the initial reservoir pressure, indicating no depletion.
The 48-hour flow test was designed to establish a connected reservoir volume and also to quantify reservoir permeability and heterogeneity.
Analysis has been undertaken of the log and test data acquired from the Okwok-9 well, and together with the seismic data, indicates that the primary objective of establishing the minimum economic field size to commercially develop the Okwok field, estimated at 25 million barrels, has been met.
Furthermore, information obtained from the well is consistent with, and supports, Afren’s subsurface model for the field, the company said.
The results suggest that well productivity under a development completion scenario from a horizontal well will be consistent with production rates typically expected in the area of between 2,000bopd to 4,000bopd per well.
Work is now focused on defining the next steps in the ongoing evaluation of the field, and in particular working up conceptual development solutions that may include stand-alone options and also development as a satellite to the nearby Ebok field.
Afren chief executive Osman Shahenshah said that the Okwok-9 appraisal well has achieved its pre drill objectives.
"With commercial viability of the Okwok development now established, we are considering development options, including either a stand-alone development or tie back to Ebok production facilities," Shahenshah said.
