Desire Petroleum has said that the sidetrack well on the Rachel prospect in the north Falkland Basin will be plugged and abandoned as the clean-out of the well has not proved possible due to mechanical failure.
However, the data acquired during drilling operations (from logging while drilling tools and geological data from cuttings) indicates that around 25m of sand with oil shows was found.
In the absence of wireline logging data, it is not possible to fully assess the significance of these results and, in particular, reservoir properties and the hydrocarbon saturations associated with these sands cannot be confirmed.
The data collected from both the Rachel main bore and sidetrack will allow the selection of an optimum location to drill a vertical well to further evaluate the potential of the Rachel prospect and undertake a comprehensive logging program.
Undertaking the logging program in a vertical well should avoid the geomechanical problems encountered in the sidetrack, which were shown to be a consequence of drilling a deviated wellbore in an area where very little regional stress data is currently available.
In the event these approvals are not rapidly forthcoming, the rig will instead move to drill the Dawn/Jacinta prospect and return to Rachel later in the drilling program.